SSM框架部分功能实现

1.实体类（UserInfo）

package com.zjitc.bean;

/**
 *   UserInfo - 实体类，映射数据库字段，字段建议一致
 */
public class UserInfo {
    private int id;             //用户ID
    private String username;    //用户名
    private String password;    //用户密码

    // get/set 访问器
    public int getId() {
        return id;
    }

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

    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;
    }


    // 构造方法
    public UserInfo() {
    }

    public UserInfo(int id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }


    // toString的方法重写
    @Override
    public String toString() {
        return "UserInfo{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

2.dao层（IUserInfoDao）

package com.zjitc.dao;

import com.zjitc.bean.UserInfo;

import java.util.List;

public interface IUserInfoDao {


    // 验证登陆
    UserInfo doLogin(String username);
    
     // 全部查询
    List<UserInfo> findAll(Integer page,Integer size);

     // 添加用户
    void addUser(UserInfo userInfo);

     // 删除用户
    void delUserById(int id);

     // 修改前查询
    UserInfo updSelUserInfoById(int id);

     // 修改用户
    void updUserById(UserInfo userInfo);
}

3.Service层
(1) 接口类（IUserInfoService）

package com.zjitc.service;

import com.zjitc.bean.UserInfo;

import java.util.List;

public interface IUserInfoService {

    UserInfo doLogin(String username);
    List<UserInfo> findAll(Integer page,Integer size);
    void addUser(UserInfo userInfo);
    void delUserById(int id);
    UserInfo updSelUserInfoById(int id);
    void updUserById(UserInfo userInfo);
}

(2) 实现类（UserInfoServiceImpl）

package com.zjitc.service.impl;

import com.github.pagehelper.PageHelper;
import com.zjitc.bean.UserInfo;
import com.zjitc.dao.IUserInfoDao;
import com.zjitc.service.IUserInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

@Service
public class UserInfoServiceImpl implements IUserInfoService {
//    @Resource(name = "u1")
    @Autowired
    private IUserInfoDao userInfoDao;
    @Override
    public UserInfo doLogin(String username) {
        return userInfoDao.doLogin(username);
    }

    @Override
    public List<UserInfo> findAll(Integer page,Integer size) {
        PageHelper.startPage(page,size);
        return userInfoDao.findAll(page,size);
    }

    @Override
    public void addUser(UserInfo userInfo) {
        userInfoDao.addUser(userInfo);
    }

    @Override
    public void delUserById(int id) {
        userInfoDao.delUserById(id);
    }

    @Override
    public UserInfo updSelUserInfoById(int id) {
        return userInfoDao.updSelUserInfoById(id);
    }

    @Override
    public void updUserById(UserInfo userInfo) {
        userInfoDao.updUserById(userInfo);
    }
}

4.Controller层（UserInfoController）

package com.zjitc.controller;

import com.github.pagehelper.PageInfo;
import com.zjitc.bean.UserInfo;
import com.zjitc.service.IUserInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;

@Controller
@RequestMapping("/user")
public class UserInfoController {
    @Autowired
    private IUserInfoService userInfoService;

    @RequestMapping("/doLogin.do")
    public String doLogin(String username, String password, HttpSession session){
        // 1、调用service，查询得到结果，自动补全返回值 ctrl+alt+v
        UserInfo userInfo = userInfoService.doLogin(username);

        // 判断
        if(userInfo != null){
            if (userInfo.getPassword().equals(password)){
                System.out.println("密码正确，登陆成功");
                session.setAttribute("userInfo",userInfo);
                return "main";
            }
            else {
                System.out.println("密码错误，登陆失败");
                session.setAttribute("message","密码错误，登陆失败");
                return "../login";
            }
        }
        else {
            System.out.println("用户不存在，请重新输入");
            session.setAttribute("message","用户不存在，请重新输入");
            return "../login";
        }
    }

//    全部查询
//    所有需要返回数据到页面显示的全部都需要封装到ModelAndView中
    @RequestMapping("/findAll.do")
    public ModelAndView findAll(@RequestParam(defaultValue = "1") Integer page, 
                                @RequestParam(defaultValue = "5") Integer size){
        List<UserInfo> userInfoList = userInfoService.findAll(page,size);
        PageInfo pageInfo = new PageInfo(userInfoList);
        ModelAndView mv = new ModelAndView();
        mv.addObject("pageInfo",pageInfo);
        mv.setViewName("user-list");
        return mv;
    }

    @RequestMapping("/addUser.do")
    public String addUser(UserInfo userInfo){
        userInfoService.addUser(userInfo);
        return "redirect:findAll.do";
    }

    @RequestMapping("/delUser.do")
    public String delUserById(int id){
        userInfoService.delUserById(id);
        System.out.println("删除成功");
        return "redirect:findAll.do";
    }

    @RequestMapping("/updSelUserById.do")
    public ModelAndView updSelUserInfoById(int id){
        UserInfo userInfo = userInfoService.updSelUserInfoById(id);
        ModelAndView mv = new ModelAndView();
        mv.addObject("userInfo",userInfo);
        mv.setViewName("user-update");
        return mv;
    }

    @RequestMapping("/updUser.do")
    public String updUserById(UserInfo userInfo){
        userInfoService.updUserById(userInfo);
        System.out.println("更新成功");
        return "redirect:findAll.do";
    }
}

5.applicationContext.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-4.3.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/tx
		http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

<!--    1、配置数据库相关参数-->
    <context:property-placeholder location="classpath:db.properties"/>
<!--    2、配置数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
<!--        <property name="maxPoolSize" value="20"/>-->
<!--        <property name="minPoolSize" value="3"/>-->
    </bean>

<!--    3、配置sqlSessionFactory对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--引入数据库连接池-->
        <property name="dataSource" ref="dataSource"/>
<!--        扫描dao层 使用别名-->
        <property name="typeAliasesPackage" value="com.zjitc.bean"/>
<!--        配合加载映射文件 *mapper.xml-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
        
<!--        分页插件pageHelper-->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <props>
                            <prop key="helperDialect">mysql</prop>
                            <prop key="reasonable">true</prop>
                        </props>
                    </property>
                </bean>
            </array>
        </property>
    </bean>
    

<!--    自动生成dao，mapper-->
<!--    4、配置扫描dao接口包，将dao层注入spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--        配置给出需要扫描的dao层路径-->
        <property name="basePackage" value="com.zjitc.dao"/>
<!--        注入Spring容器中-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

<!--    自动扫描全部包，注解支持-->
    <context:component-scan base-package="com.zjitc"/>

<!--    配置事务注解-->
    <bean id="transactionMapper" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <tx:annotation-driven></tx:annotation-driven>
</beans>

6.mapper文件（UserInfoMapper.xml）

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE mapper  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zjitc.dao.IUserInfoDao">
<!--    登陆-->
    <select id="doLogin" parameterType="String" resultType="com.zjitc.bean.UserInfo">
        select * from tb_user where username=#{username}
    </select>

<!--    全部查询-->
    <select id="findAll"  resultType="com.zjitc.bean.UserInfo">
        select * from tb_user
    </select>

    <insert id="addUser"  parameterType="com.zjitc.bean.UserInfo">
        insert into tb_user(id,username,password) values (#{id},#{username},#{password})
    </insert>

    <delete id="delUserById" parameterType="Integer">
        delete from tb_user where id=#{id}
    </delete>

    <select id="updSelUserInfoById"  parameterType="Integer" resultType="com.zjitc.bean.UserInfo">
        select * from tb_user where id=#{id}
    </select>

    <update id="updUserById" parameterType="com.zjitc.bean.UserInfo">
        update tb_user set username=#{username},password=#{password} where id=#{id}
    </update>
</mapper>

来源：CSDN

作者：IceDream556

链接：https://blog.csdn.net/IceDream556/article/details/104608891