【java】案例 --- 登录以及页面信息增删改查

其他 2020-01-17 22:40:48 阅读次数: 0

【java】案例 --- 登录以及页面信息增删改查

1. JAVA文件

1.2 dao包

1.2.1 UserDao.java

package cn.siyi.dao;

import cn.siyi.domain.User;

import java.util.List;
import java.util.Map;

/**
 * 用户操作的DAO
 */
public interface UserDao {
    public List<User> findAll();

    public User findUserByUsernameAndPassword(String username, String password);

    public void add(User user);

    public void delete(int id);

    public User findById(int id);

    public void update(User user);

    /**
     * 查询总记录数
     * @return
     * @param condition
     */
    public int findTotalCount(Map<String, String[]> condition);

    /**
     * 分页查询每页记录
     * @param start
     * @param rows
     * @param condition
     * @return
     */
    public List<User> findByPage(int start, int rows, Map<String, String[]> condition);
}

1.2.2 UserDaoImpl.java

package cn.siyi.dao.impl;

import cn.siyi.dao.UserDao;
import cn.siyi.domain.User;
import cn.siyi.util.JDBCUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class UserDaoImpl implements UserDao {

    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());

    @Override
    public List<User> findAll() {
        //使用JDBC操作数据库
        //1.定义sql
        String sql = "select * from user";
        List<User> users = template.query(sql, new BeanPropertyRowMapper<User>(User.class));
        return users;
    }

    @Override
    public User findUserByUsernameAndPassword(String username, String password) {
        try {
            String sql = "select * from user where username = ? and password = ?";
            User user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username, password);
            return user;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    @Override
    public void add(User user) {
        //1.定义sql
        String sql = "insert into user values(null,?,?,?,?,?,?,null,null)";
        //2.执行sql
        template.update(sql,user.getName(),user.getGender(),user.getAge(),user.getAddress(),user.getQq(),user.getEmail());
    }

    @Override
    public void delete(int id) {
        //1. 定义sql
        String sql = "delete from user where id = ?";
        //2. 执行sql
        template.update(sql,id);
    }

    @Override
    public User findById(int id) {
        String sql = "select * from user where id = ?";
        return template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class),id);
    }

    @Override
    public void update(User user) {
        String sql = "update user set name=?,gender=?,age=?,address=?,qq=?,email=? where id=?";
        template.update(sql,user.getName(),user.getGender(),user.getAge(),user.getAddress(),user.getQq(),user.getEmail(),user.getId());
    }

    @Override
    public int findTotalCount(Map<String, String[]> condition) {
        //1. 定义模板初始化sql
        String sql = "select count(*) from user where 1=1 ";
        StringBuilder sb = new StringBuilder(sql);
        //2. 遍历map
        Set<String> keySet = condition.keySet();
        //定义参数集合
        List<Object> params = new ArrayList<Object>();
        for(String key:keySet){
            //排除分页条件参数
            if("currentPage".equals(key) || "rows".equals(key)){
                continue;
            }
            //获取value
            String value = condition.get(key)[0];
            if(value!=null && !"".equals(value)){
                //有值
                sb.append(" and " + key + " like ? ");
                params.add("%" + value + "%");
            }
        }
        System.out.println(sb.toString());
        System.out.println("---");
        System.out.println(params);
        return template.queryForObject(sb.toString(),Integer.class,params.toArray());
    }

    @Override
    public List<User> findByPage(int start, int rows, Map<String, String[]> condition) {
        String sql = "select * from user where 1=1 ";
        StringBuilder sb = new StringBuilder(sql);
        //2. 遍历map
        Set<String> keySet = condition.keySet();
        //定义参数集合
        List<Object> params = new ArrayList<Object>();
        for(String key:keySet){
            //排除分页条件参数
            if("currentPage".equals(key) || "rows".equals(key)){
                continue;
            }
            //获取value
            String value = condition.get(key)[0];
            if(value!=null && !"".equals(value)){
                //有值
                sb.append(" and " + key + " like ? ");
                params.add("%" + value + "%");
            }
        }
        //添加分页查询
        sb.append("limit ?,?");
        params.add(start);
        params.add(rows);
        return template.query(sb.toString(),new BeanPropertyRowMapper<User>(User.class),params.toArray());
    }
}

1.3 domain包

1.3.1 PageBean.java

package cn.siyi.domain;

import java.util.List;

/**
 * 分页对象
 */
public class PageBean<T> {
    private int totalCount; //总记录数
    private int totalPage;  //总页码
    private List<T> list;   //每页的数据
    private int currentPage;//当前页码
    private int rows;        //每页显示的记录数

    public int getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }

    public int getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    @Override
    public String toString() {
        return "PageBean{" +
                "totalCount=" + totalCount +
                ", totalPage=" + totalPage +
                ", list=" + list +
                ", currentPage=" + currentPage +
                ", rows=" + rows +
                '}';
    }
}

1.3.2 User.java

package cn.siyi.domain;

public class User {
    private int id;
    private String name;
    private String gender;
    private int age;
    private String address;
    private String qq;
    private String email;

    private String username;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getQq() {
        return qq;
    }

    public void setQq(String qq) {
        this.qq = qq;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                ", qq='" + qq + '\'' +
                ", email='" + email + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

1.4 service包

1.4.1 UserService.java

package cn.siyi.service;

import cn.siyi.domain.PageBean;
import cn.siyi.domain.User;

import java.util.List;
import java.util.Map;

/**
 * 用户管理的业务接口
 */

public interface UserServive {

    /**
     * 查询所有用户信息
     * @return
     */
    public List<User> findAll();

    /**
     * 登录方法
     * @param user 用户对象
     * @return
     */
    public User login(User user);

    /**
     * 保存User
     * @param user
     */
    public void addUser(User user);

    /**
     * 根据id删除
     * @param id
     */
    public void deleteUser(String id);

    /**
     * 根据id查询
     * @param id
     * @return
     */
    public User findUserById(String id);

    /**
     * 修改用户
     * @param user
     */
    public void updateUser(User user);

    /**
     * 批量删除用户
     * @param ids
     */
    public void deSelectedUser(String[] ids);

    /**
     * 分页条件查询
     * @param currentPage
     * @param rows
     * @param condition
     * @return
     */
    PageBean<User> findUserByPage(String currentPage, String rows, Map<String, String[]> condition);
}

1.4.2 UserServiceImpl.java

package cn.siyi.service.impl;

import cn.siyi.dao.UserDao;
import cn.siyi.dao.impl.UserDaoImpl;
import cn.siyi.domain.PageBean;
import cn.siyi.domain.User;
import cn.siyi.service.UserServive;

import java.util.List;
import java.util.Map;

public class UserServiceImpl implements UserServive {
    private UserDao dao = new UserDaoImpl();

    @Override
    public List<User> findAll() {
        //调用dao
        return dao.findAll();
    }

    @Override
    public User login(User user) {
        return dao.findUserByUsernameAndPassword(user.getUsername(),user.getPassword());
    }

    @Override
    public void addUser(User user) {
        dao.add(user);
    }

    @Override
    public void deleteUser(String id) {
        dao.delete(Integer.parseInt(id));
    }

    @Override
    public User findUserById(String id) {
        return dao.findById(Integer.parseInt(id));
    }

    @Override
    public void updateUser(User user) {
        dao.update(user);
    }

    @Override
    public void deSelectedUser(String[] ids) {
        //1. 遍历数组
        for (String id : ids){
            dao.delete(Integer.parseInt(id));
        }
    }

    @Override
    public PageBean<User> findUserByPage(String _currentPage, String _rows, Map<String, String[]> condition) {
        int currentPage = Integer.parseInt(_currentPage);
        int rows = Integer.parseInt(_rows);
        if(currentPage<=0) {
            currentPage=1;
        }
        //1. 创建PageBean对象
        PageBean<User> pb = new PageBean<User>();
        //2. 调用dao查询总记录数
        int totalCount = dao.findTotalCount(condition);
        pb.setTotalCount(totalCount);
        //3. 计算总页码
        int totalPage = totalCount%rows==0 ? totalCount/rows : totalCount/rows+1;
        pb.setTotalPage(totalPage);
        if(currentPage > totalPage){
            currentPage = totalPage;
        }
        //4. 设置参数
        pb.setCurrentPage(currentPage);
        pb.setRows(rows);
        //5. 调用dao查询list集合
        //计算开始的记录索引
        int start = (currentPage - 1) * rows;
        List<User> list = dao.findByPage(start,rows,condition);
        pb.setList(list);
        return pb;
    }
}

1.5 util包

1.5.1 JDBCUtils.java

package cn.siyi.util;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

/**
 * JDBC工具类 使用Durid连接池
 */
public class JDBCUtils {

    private static DataSource ds ;

    static {

        try {
            //1.加载配置文件
            Properties pro = new Properties();
            //使用ClassLoader加载配置文件，获取字节输入流
            InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
            pro.load(is);

            //2.初始化连接池对象
            ds = DruidDataSourceFactory.createDataSource(pro);

        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取连接池对象
     */
    public static DataSource getDataSource(){
        return ds;
    }


    /**
     * 获取连接Connection对象
     */
    public static Connection getConnection() throws SQLException {
        return  ds.getConnection();
    }
}

1.6 web.servlet包

1.6.1 AddUserServlet.java

package cn.siyi.web.servlet;

import cn.siyi.domain.User;
import cn.siyi.service.UserServive;
import cn.siyi.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

@WebServlet("/addUserServlet")
public class AddUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 设置编码
        request.setCharacterEncoding("utf-8");
        //2. 获取参数
        Map<String, String[]> map = request.getParameterMap();
        //3. 封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        //4. 调用Service保存
        UserServive servive = new UserServiceImpl();
        servive.addUser(user);

        //5. 跳转到userListServlet
        response.sendRedirect(request.getContextPath()+"/userListServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

1.6.2 CheckCodeServlet.java

package cn.siyi.web.servlet;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

/**
 * 验证码
 */
@WebServlet("/checkCodeServlet")
public class CheckCodeServlet extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		
		//服务器通知浏览器不要缓存
		response.setHeader("pragma","no-cache");
		response.setHeader("cache-control","no-cache");
		response.setHeader("expires","0");
		
		//在内存中创建一个长80，宽30的图片，默认黑色背景
		//参数一：长
		//参数二：宽
		//参数三：颜色
		int width = 80;
		int height = 30;
		BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
		
		//获取画笔
		Graphics g = image.getGraphics();
		//设置画笔颜色为灰色
		g.setColor(Color.GRAY);
		//填充图片
		g.fillRect(0,0, width,height);
		
		//产生4个随机验证码，12Ey
		String checkCode = getCheckCode();
		//将验证码放入HttpSession中
		request.getSession().setAttribute("CHECKCODE_SERVER",checkCode);
		
		//设置画笔颜色为黄色
		g.setColor(Color.YELLOW);
		//设置字体的小大
		g.setFont(new Font("黑体",Font.BOLD,24));
		//向图片上写入验证码
		g.drawString(checkCode,15,25);
		
		//将内存中的图片输出到浏览器
		//参数一：图片对象
		//参数二：图片的格式，如PNG,JPG,GIF
		//参数三：图片输出到哪里去
		ImageIO.write(image,"PNG",response.getOutputStream());
	}
	/**
	 * 产生4位随机字符串 
	 */
	private String getCheckCode() {
		String base = "0123456789ABCDEFGabcdefg";
		int size = base.length();
		Random r = new Random();
		StringBuffer sb = new StringBuffer();
		for(int i=1;i<=4;i++){
			//产生0到size-1的随机值
			int index = r.nextInt(size);
			//在base字符串中获取下标为index的字符
			char c = base.charAt(index);
			//将c放入到StringBuffer中去
			sb.append(c);
		}
		return sb.toString();
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request,response);
	}
}

1.6.3 DelSelectedServlet.java

package cn.siyi.web.servlet;

import cn.siyi.service.UserServive;
import cn.siyi.service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/delSelectedServlet")
public class DelSelectedServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 获取所有id
        String[] ids = request.getParameterValues("uid");
        System.out.println(ids);
        //2. 调用service删除
        UserServive service = new UserServiceImpl();
        service.deSelectedUser(ids);
        //3. 跳转查询所有Servlet
        response.sendRedirect(request.getContextPath()+"/userListServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

1.6.4 DelUserServlet.java

package cn.siyi.web.servlet;

import cn.siyi.service.UserServive;
import cn.siyi.service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/delUserServlet")
public class DelUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 获取id
        String id = request.getParameter("id");
        //2. 调用service删除
        UserServive servive = new UserServiceImpl();
        servive.deleteUser(id);
        //3. 跳转到查询所有Servlet
        response.sendRedirect(request.getContextPath()+"/userListServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

1.6.5 FindUserByPageServlet.java

package cn.siyi.web.servlet;

import cn.siyi.domain.PageBean;
import cn.siyi.domain.User;
import cn.siyi.service.UserServive;
import cn.siyi.service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Map;

@WebServlet("/findUserByPageServlet")
public class FindUserByPageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        //1. 获取参数
        String currentPage = request.getParameter("currentPage");//当前页码
        if(currentPage==null || "".equals(currentPage)){
            currentPage = "1";
        }
        String rows = request.getParameter("rows");//每页显示条数
        if(rows==null || "".equals(rows)){
            rows = "5";
        }
        //获取条件查询参数
        Map<String, String[]> condition = request.getParameterMap();
        //2. 调用service查询
        UserServive servive = new UserServiceImpl();
        PageBean<User> pb = servive.findUserByPage(currentPage,rows,condition);
        //3. 将PageBean存入request
        request.setAttribute("pb",pb);
        request.setAttribute("condition",condition);
        //4. 转发到list.jsp
        request.getRequestDispatcher("/list.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

1.6.6 FindUserServlet.java

package cn.siyi.web.servlet;

import cn.siyi.domain.User;
import cn.siyi.service.UserServive;
import cn.siyi.service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/findUserServlet")
public class FindUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 获取id
        String id = request.getParameter("id");
        //2. 调用Service查询
        UserServive servive = new UserServiceImpl();
        User user = servive.findUserById(id);
        //3. 将user存入request域
        request.setAttribute("user",user);
        //4. 转发到update.jsp
        request.getRequestDispatcher("/update.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

1.6.7 LoginServlet.java

package cn.siyi.web.servlet;

import cn.siyi.domain.User;
import cn.siyi.service.UserServive;
import cn.siyi.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 设置编码
        request.setCharacterEncoding("utf-8");
        //2. 获取数据
        //2.1获取用户填写的验证码
        String verifycode = request.getParameter("verifycode");
        //3. 验证码校验
        HttpSession session = request.getSession();
        String checkcode_server = (String)session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//确保验证码一次性

        if(!checkcode_server.equalsIgnoreCase(verifycode)){
            //验证码不正确
            //提示信息
            request.setAttribute("login_msg","验证码错误!");
            //跳转登录页面
            request.getRequestDispatcher("/login.jsp").forward(request,response);
            return;
        }

        Map<String, String[]> map = request.getParameterMap();
        //4. 封装User对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        //5. 调用Service查询
        UserServive servive = new UserServiceImpl();
        User loginUser = servive.login(user);
        //6. 判断是否登录成功
        if(loginUser!=null){
            //登录成功
            //将用户存入session
            session.setAttribute("user",loginUser);
            //跳转页面
            response.sendRedirect(request.getContextPath()+"/index.jsp");
        }else{
            //登录失败
            //提示信息
            request.setAttribute("login_msg","用户名或者密码错误!");
            //跳转登录页面
            request.getRequestDispatcher("/login.jsp").forward(request,response);
            return;
        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

1.6.8 UpdateUserServlet.java

package cn.siyi.web.servlet;

import cn.siyi.domain.User;
import cn.siyi.service.UserServive;
import cn.siyi.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

@WebServlet("/updateUserServlet")
public class UpdateUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 设置编码
        request.setCharacterEncoding("utf-8");
        //2. 获取map
        Map<String, String[]> map = request.getParameterMap();
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        //4. 调用Service修改
        UserServive service = new UserServiceImpl();
        service.updateUser(user);
        //5. 跳转到查询所有Servlet
        response.sendRedirect(request.getContextPath()+"/userListServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

1.6.9 UserListServlet.java

package cn.siyi.web.servlet;

import cn.siyi.domain.User;
import cn.siyi.service.UserServive;
import cn.siyi.service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet("/userListServlet")
public class UserListServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.调用UserService完成查询
        UserServive servive = new UserServiceImpl();
        List<User> users = servive.findAll();
        //2.将list存入request域
        request.setAttribute("users",users);
        System.out.println(users);
        //3.转发到list.jsp
        request.getRequestDispatcher("/list.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

2. JSP文件

2.1 login.jsp

<%@ page contentType="text/html;charset=utf-8" language="java"%>
<html lang="zh-CN">
  <head>
    <meta charset="utf-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
    <meta name="viewport" content="width=device-width, initial-scale=1"/>
    <title>管理员登录</title>

    <!-- 1. 导入CSS的全局样式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery导入，建议使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 导入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
    <script type="text/javascript">
		//切换验证码
		function refreshCode() {
			//1. 获取验证码图片对象
			var vcode = document.getElementById("vcode");
			//2. 设置其src属性
			vcode.src = "${pageContext.request.contextPath}/checkCodeServlet?time="+new Date().getTime();
		}
    </script>
  </head>
  <body>
  	<div class="container" style="width: 400px;">
  		<h3 style="text-align: center;">管理员登录</h3>
        <form action="${pageContext.request.contextPath}/loginServlet" method="post">
	      <div class="form-group">
	        <label for="user">用户名：</label>
	        <input type="text" name="username" class="form-control" id="user" placeholder="请输入用户名"/>
	      </div>
	      
	      <div class="form-group">
	        <label for="password">密码：</label>
	        <input type="password" name="password" class="form-control" id="password" placeholder="请输入密码"/>
	      </div>
	      
	      <div class="form-inline">
	        <label for="vcode">验证码：</label>
	        <input type="text" name="verifycode" class="form-control" id="verifycode" placeholder="请输入验证码" style="width: 120px;"/>
	        <a href="javascript:refreshCode()">
				<img src="${pageContext.request.contextPath}/checkCodeServlet" title="看不清点击刷新" id="vcode"/>
			</a>
	      </div>
	      <hr/>
	      <div class="form-group" style="text-align: center;">
	        <input class="btn btn btn-primary" type="submit" value="登录">
	       </div>
	  	</form>
		
		<!-- 出错显示的信息框 -->
	  	<div class="alert alert-warning alert-dismissible" role="alert">
		  <button type="button" class="close" data-dismiss="alert" >
		  	<span>&times;</span></button>
		   <strong>${login_msg}</strong>
		</div>
  	</div>
  </body>
</html>

2.2 index.jsp

<%@ page contentType="text/html;charset=utf-8" language="java" %>
<html lang="zh-CN">
<head>
    <meta charset="utf-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
    <meta name="viewport" content="width=device-width, initial-scale=1"/>
    <title>首页</title>

    <!-- 1. 导入CSS的全局样式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery导入，建议使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 导入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
    <script type="text/javascript">
    </script>
</head>
<body>
<div>${user.name},欢迎您</div>
    <div align="center">
    <a
            href="${pageContext.request.contextPath}/findUserByPageServlet" style="text-decoration:none;font-size:33px">查询所有用户信息
    </a>
</div>
</body>
</html>

2.3 list.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=utf-8" language="java" %>
<html lang="zh-CN">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <!-- 使用Edge最新的浏览器的渲染方式 -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
    width: 默认宽度与设备的宽度相同
    initial-scale: 初始的缩放比，为1:1 -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>用户信息管理系统</title>

    <!-- 1. 导入CSS的全局样式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery导入，建议使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 导入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
    <style type="text/css">
        td, th {
            text-align: center;
        }
    </style>

    <script>
        function deleteUser(id) {
            //用户安全提示
            if(confirm("你确定删除吗？")){
                location.href="${pageContext.request.contextPath}/delUserServlet?id="+id;
            }
        }

        window.onload = function () {
            //给删除选中按钮添加单击事件
            document.getElementById("delSelected").onclick = function () {
                //判断是否有选中条目
                var cbs = document.getElementsByName("uid");
                var flag = false;
                for (var i = 0; i < cbs.length; i++) {
                    if(cbs[i].checked){
                        flag=true;
                        break;
                    }
                }
                if(flag){
                    if(confirm("您确定要删除选中条目吗？")){
                        document.getElementById("form").submit();
                    }
                }else{
                    alert("您未选中条码!")
                }

            };
            //1.获取第一个cb
            document.getElementById("firstCb").onclick = function () {
                //2.获取下边列表中所有的cb
                var cbs = document.getElementsByName("uid");
                //3.遍历
                for (var i = 0; i < cbs.length; i++) {
                    //4.设置这些cbs[i]的checked状态等于=firstCb.checked
                    cbs[i].checked = this.checked;
                }
            }
        }
    </script>
</head>
<body>
<div class="container">
    <h3 style="text-align: center">用户信息列表</h3>

    <div style="float: left">
        <form class="form-inline" action="${pageContext.request.contextPath}/findUserByPageServlet" method="post">
            <div class="form-group">
                <label for="exampleInputName2">姓名</label>
                <input type="text" name="name" value="${condition.name[0]}" class="form-control" id="exampleInputName2">
            </div>
            <div class="form-group">
                <label for="exampleInputName3">籍贯</label>
                <input type="text" name="address" value="${condition.address[0]}" class="form-control" id="exampleInputName3">
            </div>
            <div class="form-group">
                <label for="exampleInputEmail2">邮箱</label>
                <input type="text" name="email" value="${condition.email[0]}" class="form-control" id="exampleInputEmail2">
            </div>
            <button type="submit" class="btn btn-default">查询</button>
        </form>
    </div>

    <div style="float: right; margin: 5px;">
        <a class="btn btn-primary" href="${pageContext.request.contextPath}/add.jsp">添加联系人</a>
        <a class="btn btn-primary" href="javascript:void(0);" id="delSelected">删除选中</a>
    </div>

    <form id="form" action="${pageContext.request.contextPath}/delSelectedServlet" method="post">
        <table border="1" class="table table-bordered table-hover">
            <tr class="success">
                <th><input type="checkbox" id="firstCb"></th>
                <th>编号</th>
                <th>姓名</th>
                <th>性别</th>
                <th>年龄</th>
                <th>籍贯</th>
                <th>QQ</th>
                <th>邮箱</th>
                <th>操作</th>
            </tr>
            <c:forEach items="${pb.list}" var="user" varStatus="s">
                <tr>
                    <th><input type="checkbox" name="uid" value="${user.id}"></th>
                    <td>${s.count}</td>
                    <td>${user.name}</td>
                    <td>${user.gender}</td>
                    <td>${user.age}</td>
                    <td>${user.address}</td>
                    <td>${user.qq}</td>
                    <td>${user.email}</td>
                    <td><a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/findUserServlet?id=${user.id}">修改</a>&nbsp;
                        <a class="btn btn-default btn-sm" href="javascript:deleteUser(${user.id});">删除</a></td>
                </tr>
            </c:forEach>
        </table>
    </form>

    <div>
        <nav aria-label="Page navigation">
            <ul class="pagination">
                <c:if test="${pb.currentPage==1}">
                    <li class="disabled">
                        <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage-1}&rows=${pb.rows}&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous">
                            <span aria-hidden="true">&laquo;</span>
                        </a>
                    </li>
                </c:if>
                <c:if test="${pb.currentPage!=1}">
                    <li>
                        <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage-1}&rows=${pb.rows}&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous">
                            <span aria-hidden="true">&laquo;</span>
                        </a>
                    </li>
                </c:if>

                <c:forEach begin="1" end="${pb.totalPage}" var="i">

                    <c:if test="${pb.currentPage == i}">
                        <li class="active">
                            <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=${pb.rows}&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a>
                        </li>
                    </c:if>
                    <c:if test="${pb.currentPage != i}">
                        <li>
                            <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=${pb.rows}&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a>
                        </li>
                    </c:if>
                </c:forEach>

                <c:if test="${pb.currentPage==pb.totalPage}">
                    <li class="disabled">
                        <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage+1}&rows=${pb.rows}&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous">
                            <span aria-hidden="true">&raquo;</span>
                        </a>
                    </li>
                </c:if>
                <c:if test="${pb.currentPage!=pb.totalPage}">
                    <li>
                        <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage+1}&rows=${pb.rows}&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous">
                            <span aria-hidden="true">&raquo;</span>
                        </a>
                    </li>
                </c:if>

                <span style="font-size: 25px; margin: 10px">
                    共${pb.totalCount}条记录，共${pb.totalPage}页
                </span>
            </ul>
        </nav>
    </div>
</div>
</body>
</html>

2.4 add.jsp

<%@ page contentType="text/html; charset=utf-8" language="java" %>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <!-- 使用Edge最新的浏览器的渲染方式 -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
    width: 默认宽度与设备的宽度相同
    initial-scale: 初始的缩放比，为1:1 -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>添加用户</title>

    <!-- 1. 导入CSS的全局样式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery导入，建议使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 导入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
    <center><h3>添加联系人页面</h3></center>
    <form action="${pageContext.request.contextPath}/addUserServlet" method="post">
        <div class="form-group">
            <label for="name">姓名：</label>
            <input type="text" class="form-control" id="name" name="name" placeholder="请输入姓名">
        </div>

        <div class="form-group">
            <label>性别：</label>
            <input type="radio" name="gender" value="男" checked="checked"/>男
            <input type="radio" name="gender" value="女"/>女
        </div>

        <div class="form-group">
            <label for="age">年龄：</label>
            <input type="text" class="form-control" id="age" name="age" placeholder="请输入年龄">
        </div>

        <div class="form-group">
            <label for="address">籍贯：</label>
            <select name="address" class="form-control" id="jiguan">
                <option value="广东">广东</option>
                <option value="广西">广西</option>
                <option value="湖南">湖南</option>
                <option value="四川">四川</option>
            </select>
        </div>

        <div class="form-group">
            <label for="qq">QQ：</label>
            <input type="text" class="form-control" name="qq" placeholder="请输入QQ号码"/>
        </div>

        <div class="form-group">
            <label for="email">Email：</label>
            <input type="text" class="form-control" name="email" placeholder="请输入邮箱地址"/>
        </div>

        <div class="form-group" style="text-align: center">
            <input class="btn btn-primary" type="submit" value="提交" />
            <input class="btn btn-default" type="reset" value="重置" />
            <input class="btn btn-default" type="button" value="返回" />
        </div>
    </form>
</div>
</body>
</html>

2.5 update.jsp

<%@ page contentType="text/html; charset=utf-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html lang="zh-CN">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>修改用户</title>

    <link href="css/bootstrap.min.css" rel="stylesheet">
    <script src="js/jquery-2.1.0.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
        
</head>
<body>
<div class="container" style="width: 400px;">
    <h3 style="text-align: center;">修改联系人</h3>
    <form action="${pageContext.request.contextPath}/updateUserServlet" method="post">
        <input type="hidden" name="id" value="${user.id}">
        <div class="form-group">
            <label for="name">姓名：</label>
            <input type="text" class="form-control" id="name" name="name" value="${user.name}" readonly="readonly" placeholder="请输入姓名" />
        </div>

        <div class="form-group">
            <label>性别：</label>
            <c:if test="${user.gender=='男'}">
                <input type="radio" name="gender" value="男" checked="checked" />男
                <input type="radio" name="gender" value="女"  />女
            </c:if>
            <c:if test="${user.gender=='女'}">
                <input type="radio" name="gender" value="男"  />男
                <input type="radio" name="gender" value="女" checked="checked" />女
            </c:if>

        </div>

        <div class="form-group">
            <label for="age">年龄：</label>
            <input type="text" class="form-control" id="age"  name="age" value="${user.age}" placeholder="请输入年龄" />
        </div>

        <div class="form-group">
            <label for="address">籍贯：</label>
            <select name="address" class="form-control" >
                <c:if test="${user.address=='广东'}">
                    <option value="广东" selected="selected">广东</option>
                    <option value="广西">广西</option>
                    <option value="湖南">湖南</option>
                    <option value="四川">四川</option>
                </c:if>
                <c:if test="${user.address=='广西'}">
                    <option value="广东">广东</option>
                    <option value="广西" selected="selected">广西</option>
                    <option value="湖南">湖南</option>
                    <option value="四川">四川</option>
                </c:if>
                <c:if test="${user.address=='湖南'}">
                    <option value="广东">广东</option>
                    <option value="广西">广西</option>
                    <option value="湖南" selected="selected">湖南</option>
                    <option value="四川">四川</option>
                </c:if>
                <c:if test="${user.address=='四川'}">
                    <option value="广东">广东</option>
                    <option value="广西">广西</option>
                    <option value="湖南">湖南</option>
                    <option value="四川" selected="selected">四川</option>
                </c:if>

            </select>
        </div>

        <div class="form-group">
            <label for="qq">QQ：</label>
            <input type="text" class="form-control" name="qq" value="${user.qq}" placeholder="请输入QQ号码"/>
        </div>

        <div class="form-group">
            <label for="email">Email：</label>
            <input type="text" class="form-control" name="email" value="${user.email}" placeholder="请输入邮箱地址"/>
        </div>

        <div class="form-group" style="text-align: center">
            <input class="btn btn-primary" type="submit" value="提交" />
            <input class="btn btn-default" type="reset" value="重置" />
            <input class="btn btn-default" type="button" value="返回"/>
        </div>
    </form>
</div>
</body>
</html>
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