java+servlet+jsp查询所有信息及查询一条记录

我做的是一个员工信息查询

1.首先在employee.java中实例化字段

package com.systop.rwgl.employee.model;

import java.io.Serializable;
import java.util.List;

public class Employee implements Serializable{

	
	private static final long serialVersionUID = -5469025483066661789L;
	private String name;
	private String sex;
	private String birthday;
	private String duty;
	private String address;
	private String number;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public String getBirthday() {
		return birthday;
	}
	public void setBirthday(String birthday) {
		this.birthday = birthday;
	}
	public String getDuty() {
		return duty;
	}
	public void setDuty(String duty) {
		this.duty = duty;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public String getNumber() {
		return number;
	}
	public void setNumber(String number) {
		this.number = number;
	}
	
}

2.在EmployeeDao中进行查询，这个方法将在EmployeeServlet中调用，

   //查询所有员工信息
	@SuppressWarnings("finally")
	public List getEmployee(String no) throws Exception {
		    Connection conn = null;
	        PreparedStatement stmt = null;
			List employeeList = new ArrayList();
			try {
				String sql = "select ID,TASK_USER_ID,TASK_DEPT_ID,EM_NO,EM_XM,EM_XB,EM_SR,EM_ZW,EM_ZZ,EM_SFZH from task_employee";    //要执行的SQL
				conn = getConn();
				stmt = conn.prepareStatement(sql);
				ResultSet rs = stmt.executeQuery();
				while (rs.next()) {
					Employee e = new Employee();
					e.setId(rs.getInt(1));
					e.setUserid(rs.getInt(2));
					e.setDeptid(rs.getInt(3));
					e.setNo(rs.getInt(4));
					e.setName(rs.getString(5));
					e.setSex(rs.getString(6));
					e.setBirthday(rs.getDate(7));
					e.setDuty(rs.getString(8));
					e.setAddress(rs.getString(9));
					e.setNumber(rs.getString(10));
					employeeList.add(e);
				}
			} catch (SQLException e) {
				e.printStackTrace();
			} finally {
				if (conn != null) {
					conn.close();
				}
				if (stmt != null) {
					stmt.close();
				}
				return employeeList;
			}		
	}
	/**
	 * 查询一条记录
	 * @return 
	 * @throws SQLException
	 */
	public List getOne(int id) throws SQLException
	  {
	    String sql = " select ID,TASK_USER_ID,TASK_DEPT_ID,EM_NO,EM_XM,EM_XB,EM_SR,EM_ZW,EM_ZZ,EM_SFZH from task_employee where ID=?";
	    Connection conn = null;
           PreparedStatement stmt = null;
           conn = getConn();
		stmt = conn.prepareStatement(sql);
		stmt.setInt(1, id);
		ResultSet rs = stmt.executeQuery();
		List employeeOne = new ArrayList();
		while (rs.next())
	    {
	      Employee em = new Employee();
	       em.setId(rs.getInt(1));
	       em.setUserid(rs.getInt(2));
			em.setDeptid(rs.getInt(3));
			em.setNo(rs.getInt(4));
			em.setName(rs.getString(5));
			em.setSex(rs.getString(6));
			em.setBirthday(rs.getDate(7));
			em.setDuty(rs.getString(8));
			em.setAddress(rs.getString(9));
			em.setNumber(rs.getString(10));
			employeeOne.add(em);
	    }
		return employeeOne;
	  }

3.在EmployeeServlet中调用Dao中的方法

                /**
        	 * 查询
        	 */
		  EmployeeDao employeeDao = new EmployeeDao();
		    List employeeList;
			try {
				employeeList = employeeDao.getEmployee("");  //调用Dao中的方法存到List集合中
		           /*   for(int i = 0; i<employeeList.size();i++) {
		    	            Employee employee = (Employee)employeeList.get(i);  //for循环用来在控制台输出字段，查看是否能获取到
		    	            System.out.println(employee.getName());
		          }*/
		    request.setAttribute("employeeList",employeeList);   //通过employeeList传到前台

        	    request.getRequestDispatcher("/employee/manager.jsp").forward(request, response);   //重定向，设置跳转页面
			}catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	} 
       //查询一条记录
		int id=Integer.valueOf(request.getParameter("id"));
	     /*	System.out.println(id);*/   //可以在控制台判断是否能获取到id
		EmployeeDao employeeDao = new EmployeeDao();
		try {
			List employeeOne = employeeDao.getOne(id);
		/*	System.out.println(employeeOne.size());*/
			
			request.setAttribute("employeeOne",employeeOne);   //通过employeeOne传到前台
	        request.getRequestDispatcher("/employee/edit.jsp").forward(request, response);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

4.查询所有员工信息的数据都放到employeeList中了，接下来将他显示到jsp页面上就可以啦，查询一条记录也是这样哦

<c:forEach items="${employeeList}" var="i" varStatus="status">
	<TBODY>
	  <TR>
	     <TD>${status.index+1}</TD>
	     <TD>${i.no}</TD>
	     <TD>${i.name}</TD>
	     <TD>${i.sex}</TD>
	     <TD>${i.birthday}</TD>
	     <TD>${i.duty}</TD>
	     <TD>${i.address}</TD>
	    <TD>${i.number}</TD>
	</c:forEach>