关于SSM框架下各层的解释说明(Controller等)

package com.dvms.entity;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.NoArgsConstructor;

import lombok.ToString;

import lombok.experimental.Accessors;

import java.util.Date;

@Data

@ToString

@AllArgsConstructor

@NoArgsConstructor

@Accessors (chain = true ) //链式调用

public class Emp {

     private String id;

     private String name;

     private Double salary;

     private Integer age;

     private Date bir;

}

package com.umf.entity;

import java.io.Serializable;

public class UpdataSettingEntity implements Serializable {

     private static final long serialVersionUID = 1L;

     //

     private Integer id = 1 ;

     //

     private int updataflag;

     /**

      * 设置：

      */

     public void setId(Integer id) {

         this .id = id;

     }

     /**

      * 获取：

      */

     public Integer getId() {

         return id;

     }

     /**

      * 设置：

      */

     public void setUpdataflag( int updataflag) {

         this .updataflag = updataflag;

     }

     /**

      * 获取：

      */

     public int getUpdataflag() {

         return updataflag;

     }

}

package com.dvms.dao;

import com.dvms.entity.User;

import org.apache.ibatis.annotations.Param;

import org.springframework.stereotype.Repository;

import java.util.List;

@Repository

public interface UserDao {

     //登录

     User login( @Param ( "username" ) String username, @Param ( "password" ) String password); // 在mybatis中传递多个参数要做参数的绑定

     //新增用户(注册)

     void save(User user);

     //查询所有用户

     List<User> findAlluser();

     //删除用户

     void delete(String id);

     //修改用户信息（先查再改）

     User update(String id);

     void add(User user);

}

<? 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.dvms.dao.UserDao" >

<!--注册/新增用户-->

     < insert id = "save" parameterType = "User" >

         insert into user (id,username,password,sex,phone,email,role) values (#{id},#{username},#{password},#{sex},#{phone},#{email},#{role})

     </ insert >

<!--登录验证-->

     < select id = "login" resultType = "User" >

         select id,username,password,sex,phone,email,role from user

         where username =#{username} and password =#{password}

     </ select >

<!--查询所有用户-->

     < select id = "findAlluser" resultType = "User" >

         select id,username,password,sex,phone,email,role from user

     </ select >

<!--删除用户-->

     < delete id = "delete" parameterType = "String" >

         delete from user where id=#{id}

     </ delete >

<!--修改用户信息-->

     <!--查到要修改的用户信息-->

     < select id = "update" parameterType = "String" resultType = "User" >

         select id,username,password,sex,phone,email,role from user where id=#{id}

     </ select >

     <!--修改用户信息-->

     < update id = "add" parameterType = "User" >

         update user set username=#{username},password=#{password},sex=#{sex},phone=#{phone},email=#{email},role=#{role} where id=#{id}

     </ update >

</ mapper >

public interface StudentDao {

     @Select ( "select * from student where stu_id=#{stuId}" )

     public Student queryById( int stuId);

}

package com.dvms.service;

import com.dvms.entity.User;

import java.util.List;

public interface UserService {

     //新增用户

     void save(User user);

     //登录

     User login(String username, String password);

     //查询所有用户

     List<User> findAlluser();

     //删除用户

     void delete(String id);

     //修改用户信息

     User update(String id);

     void add(User user);

}

package com.dvms.service.Impl;

import com.dvms.dao.UserDao;

import com.dvms.entity.User;

import com.dvms.service.UserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import java.util.List;

import java.util.UUID;

@Service

public class UserServiceImpl implements UserService {

     @Autowired

     private UserDao userDao;

     @Override

     public void save(User user) {

         user.setId(UUID.randomUUID().toString());

         userDao.save(user);

     }

     @Override

     public User login(String username, String password) {

         return userDao.login(username,password);

     }

     @Override

     public List<User> findAlluser() {

         return userDao.findAlluser();

     }

     @Override

     public void delete(String id) {

         userDao.delete(id);

     }

     @Override

     public User update(String id) {

         return userDao.update(id);

     }

     @Override

     public void add(User user) {

         userDao.add(user);

     }

}

package com.dvms.controller;

import com.dvms.entity.Emp;

.....

@Controller

public class EmpController {

     @Autowired

     private EmpService empService;

     @GetMapping ( "emp/findAll" )

     public String findAll( @RequestParam (defaultValue = "1" ) int pageNum,

                           @RequestParam (defaultValue = "5" ) int pageSize,

                           Model model){

         PageHelper.startPage(pageNum,pageSize); //

         PageInfo<Emp> pageInfo = new PageInfo<>(empService.findAll());

         model.addAttribute( "pageInfo" ,pageInfo);

//        List<Emp> emps = empService.findAll();

//        model.addAttribute("emps",emps);

         return "ems/tables" ;

     }

     @RequestMapping ( "/emp/save" )

     public String save(Emp emp){

         empService.save(emp);

         return "redirect:/emp/findAll" ;

     }

}