java web针对Oracle数据库中单表emp表和dept表的增删改查以及分页

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/zhengTornado/article/details/52134539

 1. db.properties数据库配置参数
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@localhost:1521:orcl
username=scott
userpass=tiger
 2. DBHelper采用数据库连接池，连接Oracle数据库
 package com.ruide.db;

import java.beans.PropertyVetoException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class DBHelper {
    public static ComboPooledDataSource ds;
    static{
        ds=new ComboPooledDataSource();
        InputStream in=DBHelper.class.getClassLoader().getResourceAsStream("db.properties");
        Properties pro=new Properties();
        try {
            pro.load(in);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        String driver=pro.getProperty("driver");
        String url=pro.getProperty("url");
        String username=pro.getProperty("username");
        String userpass=pro.getProperty("userpass");

        try {
            ds.setDriverClass(driver);
        } catch (PropertyVetoException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        ds.setJdbcUrl(url);
        ds.setUser(username);
        ds.setPassword(userpass);
    }
}

 3.DBManager类，数据库中的数据采用List集合封装（4种方法封装查询出的数据）
 package com.ruide.db;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.ruide.mapper.IMapper;

public class DBManager{
    Connection conn=null;
    PreparedStatement pstm=null;
    ResultSet rs=null;
    public Connection getconn()throws SQLException{
        //返回连接池对象
        return DBHelper.ds.getConnection();
    }
    //1增删改函数
    public int executeUpdate(String sql,Object[]params)throws SQLException{
        //建连接
        try {
            conn=this.getconn();
            //建预处理通道
            pstm=conn.prepareStatement(sql);
            if(params!=null){
                for (int i = 0; i < params.length; i++) {
                    pstm.setObject(i+1, params[i]);
                }
            }
            //执行sql
            int result=pstm.executeUpdate();
            return result;
        } catch (SQLException e) {
            e.printStackTrace();
            throw e;
        }finally{
            try {
                pstm.close();
                conn.close();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    //2对象查询函数
    public List executeQueryObjectList(String sql,Object[]params,IMapper map)throws SQLException{
        try {
            //建连接
            conn=this.getconn();
            //建通道
            pstm=conn.prepareStatement(sql);
            //sql语句绑定数据
            if(params!=null){
                for(int i=0;i<params.length;i++){
                    pstm.setObject(i+1, params[i]);
                }
            }
            //得到结果集
            rs=pstm.executeQuery();
            //封装结果集
            List list=map.mapper(rs);
            return list;
        } catch (SQLException e) {
            e.printStackTrace();
            throw e;
        }finally{
            try {
                rs.close();
                pstm.close();
                conn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    //3总条数查询
    public int executeTotal(String sql,Object[]params)throws SQLException{
        try {
            //建连接
            conn=this.getconn();
            //建预处理通道
            pstm=conn.prepareStatement(sql);
            //sql语句绑定数据
            if(params!=null){
                for (int i = 0; i < params.length; i++) {
                    pstm.setObject(i+1, params[i]);
                }
            }
            //得到结果集
            rs=pstm.executeQuery();
            //处理结果集
            rs.next();
            int total=rs.getInt(1);
            return total;
        } catch (SQLException e) {
            e.printStackTrace();
            throw e;
        }finally{
            try {
                rs.close();
                pstm.close();
                conn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    //4.List集合的 数组方式封装结果集
    public List<Object[]> executeQueryArrayList(String sql,Object[] params)throws SQLException{
        try {
            conn=this.getconn();
            pstm=conn.prepareStatement(sql);
            if(params!=null){
                for (int i = 0; i < params.length; i++) {
                    pstm.setObject(i+1, params[i]);
                }
            }
            rs=pstm.executeQuery();
            ResultSetMetaData rsmd=rs.getMetaData();
            int count=rsmd.getColumnCount();
            List<Object[]> list=new ArrayList<Object[]>();
            while(rs.next()){
                Object[] obj=new Object[count];
                for (int i = 0; i < obj.length; i++) {
                    obj[i]=rs.getObject(i+1);
                }
                list.add(obj);
            }
            return list;
        } catch (SQLException e) {
            e.printStackTrace();
            throw e;
        }finally{
            try {
                rs.close();
                pstm.close();
                conn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    //5.List集合的  HashMap方式封装结果集
    public List<Map<String,Object>> executeQueryMapList(String sql,Object []params)throws SQLException{
        try {
            conn=this.getconn();
            pstm=conn.prepareStatement(sql);
            if(params!=null){
                for (int i = 0; i < params.length; i++) {
                    pstm.setObject(i+1, params[i]);
                }
            }
            rs=pstm.executeQuery();
            ResultSetMetaData rsmd=rs.getMetaData();
            int count=rsmd.getColumnCount();
            List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();
            while(rs.next()){
                Map<String,Object> map=new HashMap<String,Object>();
                for (int i = 0; i < count; i++) {
                    String name=rsmd.getColumnName(i+1);
                    Object values=rs.getObject(name);
                    map.put(name,values);
                }

            list.add(map);
            }
            return list;
        } catch (SQLException e) {
            e.printStackTrace();
            throw e;
        }finally{
            try {
                rs.close();
                pstm.close();
                conn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    //6.二维数组方式封装数据
    public Object[][] executeQueryArray(String sql,Object []params)throws SQLException{
        try {
            List<Object[]> list=this.executeQueryArrayList(sql, params);
            Object[][] obj=new Object[list.size()][];
            for(int i=0;i<obj.length;i++){
                obj[i] =list.get(i);
            }
            return obj;
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            throw e;
        }finally{
            try {
                rs.close();
                pstm.close();
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

}
 4.以下vo包和mapper包中的代码是针对以上面向对象的封装的一部分
package com.ruide.vo;

public class Dept {
    private int deptno;
    private String dname;
    private String loc;
    public int getDeptno() {
        return deptno;
    }
    public void setDeptno(int deptno) {
        this.deptno = deptno;
    }
    public String getDname() {
        return dname;
    }
    public void setDname(String dname) {
        this.dname = dname;
    }
    public String getLoc() {
        return loc;
    }
    public void setLoc(String loc) {
        this.loc = loc;
    }
}
package com.ruide.vo;

public class Emp {
    private int empno;
    private String ename;
    private String job;
    private int mgr;
    private String hiredate;
    private double sal;
    private double comm;
    private int deptno;
    public int getEmpno() {
        return empno;
    }
    public void setEmpno(int empno) {
        this.empno = empno;
    }
    public String getEname() {
        return ename;
    }
    public void setEname(String ename) {
        this.ename = ename;
    }
    public String getJob() {
        return job;
    }
    public void setJob(String job) {
        this.job = job;
    }
    public int getMgr() {
        return mgr;
    }
    public void setMgr(int mgr) {
        this.mgr = mgr;
    }
    public String getHiredate() {
        return hiredate;
    }
    public void setHiredate(String hiredate) {
        this.hiredate = hiredate;
    }
    public double getSal() {
        return sal;
    }
    public void setSal(double sal) {
        this.sal = sal;
    }
    public double getComm() {
        return comm;
    }
    public void setComm(double comm) {
        this.comm = comm;
    }
    public int getDeptno() {
        return deptno;
    }
    public void setDeptno(int deptno) {
        this.deptno = deptno;
    }
}

package com.ruide.mapper;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

public interface IMapper {
    public List mapper(ResultSet rs)throws SQLException;
}


package com.ruide.mapper;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.ruide.vo.Dept;
public class DeptMapper implements IMapper{
    public List mapper(ResultSet rs)throws SQLException{
        List<Dept> list=new ArrayList<Dept>();
        while(rs.next()){
            int deptno=rs.getInt(1);
            String dname=rs.getString(2);
            String loc=rs.getString(3);
            Dept d=new Dept();
            d.setDeptno(deptno);
            d.setDname(dname);
            d.setLoc(loc);
            list.add(d);
        }
        return list;
    }
}

package com.ruide.mapper;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import com.ruide.vo.Emp;

public class EmpMapper implements IMapper {

    public List mapper(ResultSet rs)throws SQLException{
        List<Emp> list=new ArrayList<Emp>();
        while(rs.next()){
            int empno=rs.getInt(1);
            String ename=rs.getString(2);
            String job=rs.getString(3);
            int mgr=rs.getInt(4);
            //String hiredate=rs.getString(5);
            java.sql.Date d=rs.getDate(5);
            //java.sql.Date 是 java.util.Date子类
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
            String hiredate=sdf.format(d);
            double sal=rs.getDouble(6);
            double comm=rs.getDouble(7);
            int deptno=rs.getInt(8);
            Emp e=new Emp();
            e.setEmpno(empno);
            e.setEname(ename);
            e.setJob(job);
            e.setMgr(mgr);
            e.setHiredate(hiredate);
            e.setSal(sal);
            e.setComm(comm);
            e.setDeptno(deptno);
            list.add(e);
        }
        return list;
    }
}

 5.dao包中主要是Sql语句以及分页查询语句，返回的是封装好的结果集
package com.ruide.dao;

import java.sql.SQLException;
import java.util.List;
import java.util.Map;

import com.ruide.db.DBManager;
import com.ruide.mapper.DeptMapper;
import com.ruide.mapper.IMapper;
import com.ruide.vo.Dept;

public class DeptDAO {
    //增加
    public int save(Dept d)throws SQLException{
        String sql=" insert into dept values(?,?,?) ";
        Object []params={d.getDeptno(),d.getDname(),d.getLoc()};
        DBManager db=new DBManager();
        int hang=db.executeUpdate(sql, params);
        return hang;
    }
    //修改
    public int merge(Dept d)throws SQLException{
        String sql="update dept set dname=?,loc=? where deptno=?";
        Object []params={d.getDname(),d.getLoc(),d.getDeptno()};
        DBManager db=new DBManager();
        return db.executeUpdate(sql, params);
    }
    //删除
    public int delete(int deptno)throws SQLException{
        String sql=" delete from dept where deptno=? ";
        Object []params={deptno};
        DBManager db=new DBManager();
        return db.executeUpdate(sql, params);
    }
    //对象查询语句
    public List queryObjectList(int pagesize,int pagenow)throws SQLException{
        String sql="";
        sql+=" select A.deptno,A.dname,A.loc from "; 
        sql+=" (select d.*,rownum rn from dept d) A ";
        sql+=" where rn>? and rownum<=? ";
        Object[] params={(pagenow-1)*pagesize,pagesize};
        IMapper mapper=new DeptMapper();
        DBManager db=new DBManager();
        List list=db.executeQueryObjectList(sql,params, mapper);
        return list;
    }
    //总条数查询
    public int querytotal()throws SQLException{
        String sql="select count(*) from dept ";
        DBManager db=new DBManager();
        int total=db.executeTotal(sql, null);
        return total;
    }
    //list 数组查询
    public List<Object[]> queryObjectArrayList(int pagesize,int pagenow)throws SQLException{
        String sql="";
        sql+=" select A.* from "; 
        sql+=" (select d.*,rownum rn from dept d) A ";
        sql+=" where rn>? and rownum<=? ";
        Object []params={(pagenow-1)*pagesize,pagesize};
        DBManager db=new DBManager();
        return db.executeQueryArrayList(sql, params);
    }
    //list HashMap查询
    public List<Map<String,Object>> queryMapList(int pagesize,int pagenow)throws SQLException{
        String sql="";
        sql+="select A.* from "; 
        sql+=" (select d.*,rownum rn from dept d) A ";
        sql+=" where rn>? and rownum<=? ";
        Object[] params={(pagenow-1)*pagesize,pagesize};
        DBManager db=new DBManager();
        return db.executeQueryMapList(sql, params);
    }
    //二维数组查询
    public Object[][] queryObjectArray(int pagesize,int pagenow)throws SQLException{
        String sql="";
        sql+="select A.* from "; 
        sql+=" (select d.*,rownum rn from dept d) A ";
        sql+=" where rn>? and rownum<=? ";
        Object[]params={(pagenow-1)*pagesize,pagesize};
        DBManager db=new DBManager();
        return db.executeQueryArray(sql, params);
    }
    //特定对象查询（根据主键）
    public Dept queryById(int deptno)throws SQLException{
        String sql="select * from dept where deptno=? ";
        Object[] params={deptno};
        IMapper mapper=new DeptMapper();
        DBManager db=new DBManager();
        List<Dept> list=db.executeQueryObjectList(sql, params, mapper);
        Dept d=list.get(0);
        return d;
    }
    public List queryAll()throws SQLException{
        String sql="select *from dept";
        IMapper mapper=new DeptMapper();
        DBManager db=new DBManager();
        List<Dept> list=db.executeQueryObjectList(sql, null, mapper);
        return list;
    }
}
package com.ruide.dao;

import java.sql.SQLException;
import java.util.List;
import java.util.Map;

import com.ruide.db.DBManager;
import com.ruide.mapper.EmpMapper;
import com.ruide.mapper.IMapper;
import com.ruide.vo.Emp;

public class EmpDAO {
    //1.增加
    public int save(Emp e)throws SQLException{
        String sql=" insert into emp values(?,?,?,?,to_date(?,'yyyy-MM-dd'),?,?,?) ";
        Object[]params={e.getEmpno(),e.getEname(),e.getJob(),e.getMgr(),e.getHiredate(),e.getSal(),e.getComm(),e.getDeptno()}; 
        DBManager db=new DBManager();
        return db.executeUpdate(sql, params);
    }
    //2.修改
    public int merge(Emp e)throws SQLException{
        String sql="update emp set ename=?,job=?,mgr=?,hiredate=to_date(?,'yyyy-MM-dd'),sal=?,comm=?,deptno=? where empno=?";
        Object[]params={e.getEname(),e.getJob(),e.getMgr(),e.getHiredate(),e.getSal(),e.getComm(),e.getDeptno(),e.getEmpno()};
        DBManager db=new DBManager();
        return db.executeUpdate(sql, params);
    }
    //3.删除
    public int delete(int empno)throws SQLException{
        String sql="delete from emp where empno=?";
        Object[]params={empno};
        DBManager db=new DBManager();
        return db.executeUpdate(sql, params);
    }
    //4.总条数查询
    public int queryTotal()throws SQLException{
        String sql=" select count(*) from emp ";
        DBManager db=new DBManager();
        int total=db.executeTotal(sql, null);
        return total;   
    }
    //5.根据主键查询
    public Emp queryById(int empno)throws SQLException{
        String sql=" select *from emp where empno=? ";
        Object []params={empno};
        IMapper mapper=new EmpMapper();
        DBManager db=new DBManager();
        List<Emp> list=db.executeQueryObjectList(sql, params, mapper);
        Emp e=list.get(0);
        return e;
    }

    //6.List 集合对象查询
    public List queryObjectList(int pagesize,int pagenow)throws SQLException{
        String sql="";  
        sql+=" select A.empno,A.ename,A.job,A.mgr,A.hiredate,A.sal,A.comm,A.deptno from ";
        sql+=" (select rownum rn,e.* from emp e ) A ";
        sql+=" where rn>? and rownum<=? ";
        Object[] params={(pagenow-1)*pagesize,pagesize};
        IMapper mapper=new EmpMapper();
        DBManager db=new DBManager();
        List<Emp> list=db.executeQueryObjectList(sql,params, mapper);
        return list;
    }
    //7.List 集合数组的查询
    public List<Object[]> queryObjectArrayList(int pagesize,int pagenow)throws SQLException{
        String sql="";

        sql+=" select A.* from ";
        sql+=" (select e.*,rownum rn from emp e ) A ";
        sql+=" where rn>? and rownum<=?";
        Object []params={(pagenow-1)*pagesize,pagesize};
        DBManager db=new DBManager();
        return db.executeQueryArrayList(sql, params);
    }
    //8.List 集合Map方式查询
    public List<Map<String,Object>> queryMapList(int pagesize,int pagenow)throws SQLException{
        String sql="";
        sql+=" select A.* from ";
        sql+=" (select e.*,rownum rn from emp e ) A ";
        sql+=" where rn>? and rownum<=? ";
        Object[]params={(pagenow-1)*pagesize,pagesize};
        DBManager db=new DBManager();
        return db.executeQueryMapList(sql, params);     
    }
    //二维数组方式查询
    public Object[][] queryObjectArray(int pagesize,int pagenow)throws SQLException{
        String sql="";
        sql+=" select A.* from ";
        sql+=" (select e.*,rownum rn from emp e ) A ";
        sql+=" where rn>? and rownum<=? ";
        Object[]params={(pagenow-1)*pagesize,pagesize};
        DBManager db=new DBManager();
        Object[][] obj=db.executeQueryArray(sql, params);
        return obj;
    }
    public List queryAll()throws SQLException{
        String sql="select *from emp ";
        IMapper mapper=new EmpMapper();
        DBManager db=new DBManager();
        List<Emp> list=db.executeQueryObjectList(sql, null, mapper);
        return list;
    }
}

 6.filter包主要是过滤器：主要过滤编码方式
 package com.ruide.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class EncodingFilter implements Filter{
    public void init(FilterConfig filterConfig)throws ServletException{

    }
    public void destroy(){

    }
    public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain)
        throws ServletException,IOException{
        HttpServletRequest request1=(HttpServletRequest)request;
        HttpServletResponse response1=(HttpServletResponse)response;
        request1.setCharacterEncoding("UTF-8");
        response1.setCharacterEncoding("UTF-8");
        chain.doFilter(request1, response1);
    }

}

 7.action包中主要是servlet类，主要用来接收客户端请求和处理客户端请求并给客户响应，与jsp页面交互，
(1)dept表的展示（查），保存（增），删除 ，修改（需要2个servlet）
package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.DeptDAO;
import com.ruide.vo.Dept;

public class PreShowDeptAction extends HttpServlet {
    public void doGet(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        try {
            DeptDAO dao=new DeptDAO();
            //List<Dept> list=dao.queryAll();

            //请求当前页
            String strpagenow=request.getParameter("pagenow");
            int pagenow;
            if(strpagenow==null){
                pagenow=1;
            }else{

                pagenow=new Integer(strpagenow);
            }
            //每页大小
            int pagesize=2;
            List<Dept> list=dao.queryObjectList(pagesize, pagenow);         

            int total=dao.querytotal();//总条数
            int totalpage=(total-1)/pagesize+1;//总页数

            //request可以带值传递，把封装好的List集合对象放在request容器中
            request.setAttribute("st",list);
            request.setAttribute("pagenow", pagenow);
            request.setAttribute("pagesize", pagesize);
            request.setAttribute("total", total);
            request.setAttribute("totalpage", totalpage);
            //在哪里展示？请求转发到jsp页面
            RequestDispatcher disp=request.getRequestDispatcher("showdept.jsp");
            disp.forward(request, response);//同质体
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.DeptDAO;
import com.ruide.vo.Dept;

public class SaveDeptAction extends HttpServlet {
    public void doPost(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        //request.setCharacterEncoding("UTF-8");
        String deptno=request.getParameter("deptno");
        String dname=request.getParameter("dname");
        String loc=request.getParameter("loc");
        Dept d=new Dept();
        d.setDeptno(new Integer(deptno));
        d.setDname(dname);
        d.setLoc(loc);
        try {
            DeptDAO dao=new DeptDAO();
            int hang=dao.save(d);
            response.sendRedirect("preshowdept");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.DeptDAO;
import com.ruide.vo.Dept;

public class DeleteDeptAction extends HttpServlet{
    public void doGet(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        try {
            String deptno=request.getParameter("deptno");
            DeptDAO dao=new DeptDAO();
            int hang=dao.delete(new Integer(deptno));
            response.sendRedirect("preshowdept");
        } catch (NumberFormatException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.DeptDAO;
import com.ruide.vo.Dept;

public class PreUpdateDeptAction extends HttpServlet{
    public void doGet(HttpServletRequest request,HttpServletResponse response)
        throws ServletException,IOException{
        try {
            String strdeptno=request.getParameter("deptno");
            int deptno=new Integer(strdeptno);
            DeptDAO dao=new DeptDAO();
            Dept d=dao.queryById(deptno);
            //把对象放入request范围
            request.setAttribute("d", d);
            RequestDispatcher disp=request.getRequestDispatcher("updatedept.jsp");
            disp.forward(request, response);
        } catch (NumberFormatException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }   
    }
}


package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.DeptDAO;
import com.ruide.vo.Dept;

public class UpdateDeptAction extends HttpServlet{
    public void doPost(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        try {
            //request.setCharacterEncoding("utf-8");
            String deptno=request.getParameter("deptno");
            String dname=request.getParameter("dname");
            String loc=request.getParameter("loc");
            Dept d=new Dept();
            d.setDeptno(new Integer(deptno));
            d.setDname(dname);
            d.setLoc(loc);
            DeptDAO dao=new DeptDAO();
            int hang=dao.merge(d);
            response.sendRedirect("preshowdept");
        } catch (NumberFormatException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

(2)emp表的展示（查），保存（增），删除 ，修改（需要2个servlet）
package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.EmpDAO;
import com.ruide.vo.Dept;
import com.ruide.vo.Emp;

public class PreShowEmpAction extends HttpServlet{
    public void doGet(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        EmpDAO dao=new EmpDAO();
        try {
            //List<Emp> list=dao.queryAll();
            //请求当前页
            String strpagenow=request.getParameter("pagenow");
            int pagenow;
            if(strpagenow==null){
                pagenow=1;
            }else{

                pagenow=new Integer(strpagenow);
            }
            //每页大小
            //int pagesize=2;
            String strpagesize=request.getParameter("pagesize");
            int pagesize;
            if(strpagesize==null){
                pagesize=4;
            }else{
                pagesize=new Integer(strpagesize);
            }
            List<Emp> list=dao.queryObjectList(pagesize, pagenow);      

            int total=dao.queryTotal();//总条数
            int totalpage=(total-1)/pagesize+1;//总页数

            //request是可以带值传递的
            request.setAttribute("list", list);
            request.setAttribute("pagenow", pagenow);
            request.setAttribute("pagesize", pagesize);
            request.setAttribute("total", total);
            request.setAttribute("totalpage", totalpage);

        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //请求转发
        RequestDispatcher disp=request.getRequestDispatcher("showemp.jsp");
        disp.forward(request, response);        
    }
}


package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.EmpDAO;
import com.ruide.vo.Emp;

public class SaveEmpAction extends HttpServlet{
    public void doPost(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        //request.setCharacterEncoding("UTF-8");//千万不要忘记设置编码方式，否则出现异常
        //（1）获取用户在文本框中输入的信息
        String empno=request.getParameter("empno");
        String ename=request.getParameter("ename");
        String job=request.getParameter("job");
        String mgr=request.getParameter("mgr");
        String hiredate=request.getParameter("hiredate");
        String sal=request.getParameter("sal");
        String comm=request.getParameter("comm");
        String deptno=request.getParameter("deptno");
        //（2）封装对象，即调用setXXX方法，
        Emp e=new Emp();
        e.setEmpno(new Integer(empno));
        e.setEname(ename);
        e.setJob(job);
        e.setMgr(new Integer(mgr));
        e.setHiredate(hiredate);
        e.setSal(new Double(sal));
        e.setComm(new Double(comm));
        e.setDeptno(new Integer(deptno));
        //调用DAO中的save方法保存数据
        try {
            EmpDAO dao=new EmpDAO();
            int hang=dao.save(e);
            response.sendRedirect("preshowemp");
        } catch (SQLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

    }
}

package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.EmpDAO;

public class DeleteEmpAction extends HttpServlet{
    public void doGet(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        try {
            String empno=request.getParameter("empno");
            EmpDAO dao=new EmpDAO();
            int hang=dao.delete(new Integer(empno));
            response.sendRedirect("preshowemp");
        } catch (NumberFormatException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}


package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.EmpDAO;
import com.ruide.vo.Emp;

public class PreUpdateEmpAction extends HttpServlet {
    public void doGet(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        try {
            String strempno=request.getParameter("empno");
            int empno=new Integer(strempno);

            EmpDAO dao=new EmpDAO();
            Emp e=dao.queryById(empno);
            request.setAttribute("e", e);

            RequestDispatcher disp=request.getRequestDispatcher("updateemp.jsp");
            disp.forward(request, response);
        } catch (NumberFormatException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}
package com.ruide.action;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruide.dao.EmpDAO;
import com.ruide.vo.Emp;

public class UpdateEmpAction extends HttpServlet {
    public void doPost(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException{
        //request.setCharacterEncoding("UTF-8");
        String empno=request.getParameter("empno");
        String ename=request.getParameter("ename");
        String job=request.getParameter("job");
        String mgr=request.getParameter("mgr");
        String hiredate=request.getParameter("hiredate");
        String sal=request.getParameter("sal");
        String comm=request.getParameter("comm");
        String deptno=request.getParameter("deptno");
        Emp e=new Emp();
        e.setEmpno(new Integer(empno));
        e.setEname(ename);
        e.setJob(job);
        e.setMgr(new Integer(mgr));
        e.setHiredate(hiredate);
        e.setSal(new Double(sal));
        e.setComm(new Double(comm));
        e.setDeptno(new Integer(deptno));
        EmpDAO dao=new EmpDAO();
        try {
            int hang=dao.merge(e);
            response.sendRedirect("preshowemp");
        } catch (SQLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
    }
}

8.web.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <filter>
        <filter-name>encoding</filter-name>
        <filter-class>com.ruide.filter.EncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping> 
    <!-- 2016-8-4 修改，分页查询-->
    <servlet>
        <servlet-name>preupdateemp</servlet-name>
        <servlet-class>com.ruide.action.PreUpdateEmpAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>preupdateemp</servlet-name>
        <url-pattern>/preupdateemp</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>updateemp</servlet-name>
        <servlet-class>com.ruide.action.UpdateEmpAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>updateemp</servlet-name>
        <url-pattern>/updateemp</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>preupdatedept</servlet-name>
        <servlet-class>com.ruide.action.PreUpdateDeptAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>preupdatedept</servlet-name>
        <url-pattern>/preupdatedept</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>updatedept</servlet-name>
        <servlet-class>com.ruide.action.UpdateDeptAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>updatedept</servlet-name>
        <url-pattern>/updatedept</url-pattern>
    </servlet-mapping>
    <!--2016-8-3 保存，增加，删除 -->
    <servlet>
        <servlet-name>preshowemp</servlet-name>
        <servlet-class>com.ruide.action.PreShowEmpAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>preshowemp</servlet-name>
        <url-pattern>/preshowemp</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>preshowdept</servlet-name>
        <servlet-class>com.ruide.action.PreShowDeptAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>preshowdept</servlet-name>
        <url-pattern>/preshowdept</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>saveemp</servlet-name>
        <servlet-class>com.ruide.action.SaveEmpAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>saveemp</servlet-name>
        <url-pattern>/saveemp</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>savedept</servlet-name>
        <servlet-class>com.ruide.action.SaveDeptAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>savedept</servlet-name>
        <url-pattern>/savedept</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>deletedept</servlet-name>
        <servlet-class>com.ruide.action.DeleteDeptAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>deletedept</servlet-name>
        <url-pattern>/deletedept</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>deleteemp</servlet-name>
        <servlet-class>com.ruide.action.DeleteEmpAction</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>deleteemp</servlet-name>
        <url-pattern>/deleteemp</url-pattern>
    </servlet-mapping>
</web-app>

9.jsp页面（jsp的本质是个特殊的servlet类）主要用来展示数据，发送请求
（1）dept表的数据展示页面，数据保存页面，数据修改页面
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="com.ruide.vo.Dept" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'showdept.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    <script type="text/javascript">
        function doclick(){
            var value=document.getElementById("pagenow").value;
            window.location.href="preshowdept?pagenow="+value;
        }
        function dochange(obj){
            var value=obj.value;
            window.location.href="preshowdept?pagenow="+value;
        }
    </script>
  </head>

  <body>
    <%
        Object objpagenow=request.getAttribute("pagenow");
        int pagenow=new Integer(objpagenow.toString());

        Object objpagesize=request.getAttribute("pagesize");
        int pagesize=new Integer(objpagesize.toString());

        Object objtotal=request.getAttribute("total");
        int total=new Integer(objtotal.toString());

        Object objtotalpage=request.getAttribute("totalpage");
        int totalpage=new Integer(objtotalpage.toString());     
     %>

    <table border="1" align="center" width="800">
        <tr>
            <th colspan="4" align="center">部门信息表</th>
        </tr>
        <tr>
            <td>部门编号</td>
            <td>部门名称</td>
            <td>部门地址</td>
            <td>操作</td>
        </tr>
        <%
            List<Dept> list=(List<Dept>)request.getAttribute("st");
            for(int i=0;i<list.size();i++){
                Dept d=list.get(i);
         %>
            <tr>
                <td><%=d.getDeptno() %></td>
                <td><%=d.getDname() %></td>
                <td><%=d.getLoc() %></td>
                <td><a href="deletedept?deptno=<%=d.getDeptno()%>">删除</a>
                    &nbsp;
                    <a href="preupdatedept?deptno=<%=d.getDeptno() %>">修改</a>
                </td>               
            </tr>
         <%
            }
         %>
            <tr><td colspan="4"><a href="savedept.jsp">增加部门信息</a></td></tr>
            <tr>
                <td colspan="4">
                    <%if(pagenow==1){ %>
                        首页  上一页
                    <% }else{%> 
                        <a href="preshowdept?pagenow=1"> 首页</a>
                        <a href="preshowdept?pagenow=<%=pagenow-1%>">上一页 </a>
                    <%} %>
                    <%if(pagenow==totalpage){ %>
                        下一页  尾页
                    <%}else{ %>
                        <a href="preshowdept?pagenow=<%=pagenow+1 %>">下一页</a>
                        <a href="preshowdept?pagenow=<%=totalpage %>">尾页</a>    
                    <%} %>
                    共<%=totalpage %>页
                    当前<%=pagenow %>页
                    每页<%=pagesize %>条
                    共<%=total %>条
                    请输入<input id="pagenow" value="<%=pagenow %>" size="2"/>
                    <input type="button" onclick="doclick()" value="跳转">
                    <select onchange="dochange(this)">
                        <%
                            for(int i=1;i<totalpage;i++){
                         %>
                         <option <%=pagenow==i?"selected='true'":"" %>value="<%=i%>">第<%=i%>页</option>
                         <%} %>
                    </select>
                </td>
            </tr>
    </table>
  </body>
</html>


<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'savedept.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  <body>
    <form action="savedept" method="post">
        <table border="1" width="400" align="center">
            <tr><td align="center">新增部门信息</td></tr>
            <tr><td>部门编号  <input type="text" name="deptno"></td></tr>
            <tr><td>部门名称  <input type="text" name="dname"></td></tr>
            <tr><td>部门地址  <input type="text" name="loc"></td></tr>
            <tr><td>
                <input type="submit" value="保存">
                <input type="reset" value="重置">
            </td></tr>
        </table>
    </form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="com.ruide.vo.Dept" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'updatedept.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body>
    <% Dept d=(Dept)request.getAttribute("d"); %>
    <form action="updatedept" method="post">
        <table border="1" align="center">
            <tr><td align="center">修改部门信息表数据</td></tr>
            <tr><td>部门编号：<input type="text" name="deptno" value="<%=d.getDeptno() %>"></td></tr>
            <tr><td>部门名称：<input type="text" name="dname" value="<%=d.getDname()%>"></td></tr>
            <tr><td>部门地址：<input type="text" name="loc" value="<%=d.getLoc() %>"></td></tr>
            <tr><td>
                <input type="submit" value="修改">
                <input type="reset" value="重置">
            </td></tr>
        </table>
    </form>
  </body>
</html>

（2）emp表的数据展示页面，数据保存页面，数据修改页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="com.ruide.vo.Emp" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'showemp.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    <script type="text/javascript">
        function doclick1(){//传递每页大小pagesize
            var value=document.getElementById("pagesizeid").value;
            window.location.href="preshowemp?pagesize="+value;
        }

        function doclick(){//跳转方法
            var valuenow=document.getElementById("pagenowid").value;
            var valuesize=document.getElementById("pagesizeid").value;
            window.location.href="preshowemp?pagenow="+valuenow+"&pagesize="+valuesize;
        }

        function dochange(obj){
            var value=obj.value;
            var valuesize=document.getElementById("pagesizeid").value;
            window.location.href="preshowemp?pagenow="+value+"&pagesize="+valuesize;
        }
    </script>
  </head>

  <body>
        <%
        //获取当前页码
        Object objpagenow=request.getAttribute("pagenow");
        int pagenow=new Integer(objpagenow.toString());
        //每页大小（即每页有多少条数据）
        Object objpagesize=request.getAttribute("pagesize");
        int pagesize=new Integer(objpagesize.toString());
        //总条数
        Object objtotal=request.getAttribute("total");
        int total=new Integer(objtotal.toString());
        //总页数
        Object objtotalpage=request.getAttribute("totalpage");
        int totalpage=new Integer(objtotalpage.toString());     
     %>
    <table border="1" align="center">
        <tr>
            <th colspan="9">员工信息表</th>
        </tr>
        <tr>
            <td>员工编号</td>
            <td>员工姓名</td>
            <td>员工工作</td>
            <td>上级编号</td>
            <td>入职日期</td>
            <td>员工工资</td>
            <td>员工奖金</td>
            <td>部门编号</td>
            <td>操作</td>
        </tr>
        <% 
            List<Emp> list=(List<Emp>)request.getAttribute("list");
            for(int i=0;i<list.size();i++){
                Emp e=list.get(i);      
        %>
            <tr>
                <td><%=e.getEmpno() %></td>
                <td><%=e.getEname() %></td>
                <td><%=e.getJob() %></td>
                <td><%=e.getMgr() %></td>
                <td><%=e.getHiredate() %></td>
                <td><%=e.getSal() %></td>
                <td><%=e.getComm() %></td>
                <td><%=e.getDeptno() %></td>
                <td><a href="deleteemp?empno=<%=e.getEmpno()%>">删除</a>
                    &nbsp;
                    <a href="preupdateemp?empno=<%=e.getEmpno()%>">修改</a>
                </td>
            </tr>           
        <%      
            }
        %>
        <tr><td colspan="9"><a href="saveemp.jsp">增加员工信息</a></td></tr>
        <tr>
                <td colspan="9">
                    <%if(pagenow==1){ %>
                        首页  上一页
                    <% }else{%> 
                        <a href="preshowemp?pagenow=1&pagesize=<%=pagesize %>"> 首页</a>
                        <a href="preshowemp?pagenow=<%=pagenow-1%>&pagesize=<%=pagesize %>">上一页 </a>
                    <%} %>
                    <%if(pagenow==totalpage){ %>
                        下一页  尾页
                    <%}else{ %>
                        <a href="preshowemp?pagenow=<%=pagenow+1 %>&pagesize=<%=pagesize %>">下一页</a>
                        <a href="preshowemp?pagenow=<%=totalpage %>&pagesize=<%=pagesize %>">尾页</a> 
                    <%} %>
                    共<%=totalpage %>页
                    当前<%=pagenow %>页
                    每页<%=pagesize %>条
                    共<%=total %>条
                    每页展示条数<input id="pagesizeid" value="<%=pagesize%>" size="1" />
                    <input type="button" onclick="doclick1()" value="展示">
                    请输入页码<input id="pagenowid" value="<%=pagenow%>" size="1" />
                    <input type="button" onclick="doclick()" value="转到该页" />
                    <select onchange="dochange(this)">
                        <%
                            for(int i=1;i<=totalpage;i++){
                         %>
                         <option <%=pagenow==i?"selected='true'":"" %>value="<%=i %>">第<%=i%>页</option>
                         <%} %>
                    </select>
                </td>
            </tr>
    </table>
  </body>
</html>


<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'saveemp.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body>
    <form action="saveemp" method="post">
        <table border="1" align="center" width="400">
            <tr>    
                <th>新增员工信息</th>
            </tr>
            <tr>
                <td>员工编号 <input type="text" name="empno" /></td>
            </tr>
            <tr>
                <td>员工姓名 <input type="text" name="ename" /></td>
            </tr>
            <tr>
                <td>员工工作 <input type="text" name="job" /></td>
            </tr>
            <tr>
                <td>上级编号 <input type="text" name="mgr" /></td>
            </tr>
            <tr>
                <td>入职日期 <input type="text" name="hiredate" /></td>
            </tr>
            <tr>
                <td>员工工资 <input type="text" name="sal" /></td>
            </tr>
            <tr>
                <td>员工奖金 <input type="text" name="comm" /></td>
            </tr>
            <tr>
                <td>部门编号 <input type="text" name="deptno" /></td>
            </tr>
            <tr>
                <td align="center">
                    <input type="submit" value="保存信息">
                    <input type="reset" value="重置信息">
                </td>   
            </tr>
        </table>
    </form>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="com.ruide.vo.Emp" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'updateemp.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body>
     <% Emp e=(Emp)request.getAttribute("e"); %>
    <form action="updateemp" method="post">
        <table border="1" align="center" width="400">
            <tr><th align="center">修改员工信息表</th></tr>
            <tr><td>员工编号 <input type="text" name="empno" value="<%=e.getEmpno() %>"></td></tr>
            <tr><td>员工姓名 <input type="text" name="ename" value="<%=e.getEname() %>"></td></tr>
            <tr><td>员工工作 <input type="text" name="job" value="<%=e.getJob() %>"></td></tr>
            <tr><td>上级编号 <input type="text" name="mgr" value="<%=e.getMgr() %>"></td></tr>
            <tr><td>入职日期 <input type="text" name="hiredate" value="<%=e.getHiredate() %>"></td></tr>
            <tr><td>员工工资 <input type="text" name="sal" value="<%=e.getSal() %>"></td></tr>
            <tr><td>员工奖金 <input type="text" name="comm" value="<%=e.getComm() %>"></td></tr>
            <tr><td>部门编号 <input type="text" name="deptno" value="<%=e.getDeptno() %>"></td></tr>
            <tr>
                <td>
                    <input type="submit"  value="确定修改"/>
                    <input type="reset" value="重置" />
                </td>
            </tr>
        </table>
    </form>
  </body>
</html>