• controller

package com.Lee.connect.controller;

import com.Lee.connect.mapper.UserMapper;
import com.Lee.connect.table.TableUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping(value = "/")
public class UserController{
    @Autowired
    UserMapper userMapper;

    @RequestMapping(value = "/getUser")
    @ResponseBody
    public Object getUser(@RequestParam("id") Integer id){
        TableUser user = userMapper.getUserById(id);
        return user;
    }

    @RequestMapping(value = "/delUser")
    @ResponseBody
    public Object delUser(@RequestParam("id") Integer id){
        userMapper.delUserById(id);
        return "delete finished";
    }

    @RequestMapping(value = "/setUser")
    @ResponseBody
    public Object setUser(@RequestParam("UserName") String UserName,@RequestParam("PassWord") String PassWord,@RequestParam("id") Integer id){
        TableUser user = new TableUser();
        user.setId(id);
        user.setUserName(UserName);
        user.setPassWord(PassWord);
        userMapper.updateUser(user);
        return user;
    }


}

此处定义了三个方法，分别用于删改查

@RequesBody的value值也根据方法的作用进行更改，在http中就是请求的路径不同

使用@RequestParam("username") String username可以作为类的参数，这样就需要使用?参数1&参数2来http请求传入参数给controller

• mapper

package com.Lee.connect.mapper;

import com.Lee.connect.table.TableUser;
import org.apache.ibatis.annotations.*;
import org.springframework.stereotype.Component;

@Mapper
@Component(value = "UserMapper")
public interface UserMapper {
    //select
    @Select("select * from t1 where id=#{id}")
    TableUser getUserById(@Param("id") Integer id);
    //delete
    @Delete("delete from t1 where id=#{id}")
    void delUserById(@Param("id") Integer id);
    //update
    @Update("update t1 set UserName=#{UserName},PassWord=#{PassWord} where id=#{id}")
    void updateUser(TableUser user);

}

此接口定义了三个方法，分别使用了不同的sql语句

注意查会返回一个对象，使用entity对应的tableuser进行接收

删和改则无返回值，使用void

• 传参

使用/value?参数1&参数2在地址栏中添加参数

/value为controller中使用的方法

参数为@RequestParam("username") String username中对应的参数