MVC模式实现用户登录以及用户信息的增删改查（CRUD）

MVC模式简介

实现的功能

 

数据库表的设计

JavaBean

User.java

package com.wm.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;

    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;
    }

    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;
    }

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

PageBean.java

package com.wm.domain;

import java.util.List;

//分页对象
public class PageBean {
    private int totalcount;//总记录数
    private int totalpage;//总页码
    private List 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 getList() {
        return list;
    }

    public void setList(List 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 +
                '}';
    }
}

连接数据库工具类

JDBCUtils .java

package com.wm.util;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import javax.xml.crypto.Data;
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();
    }
}

Dao层

package com.wm.dao;

import com.wm.domain.User;

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

public interface UserDao {
    public List findAll();

    void add(User user);

    void delete(int parseInt);

    User findById(int parseInt);

    void updateUser(User user);
    //查询总记录数
    int findTotalCount(Map condition);
    //分页查询每页记录
    List findByPage(int start, int rows, Map condition);
}

UserDaoImpl.java

package com.wm.dao.impl;

import com.wm.dao.UserDao;
import com.wm.domain.User;
import com.wm.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 findAll() {
        //使用jdbc操作数据库
        //定义sql
        String sql="select * from user";
        List users = template.query(sql, new BeanPropertyRowMapper(User.class));
        return users;
    }

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

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

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

    @Override
    public void updateUser(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 condition) {
        //定义模板初始化sql
        String sql="select count(*) from user where 1=1";
        StringBuilder sb = new StringBuilder(sql);
        //遍历map集合
        Set keySet = condition.keySet();
        //定义参数的集合
        List