本文共 7192 字，大约阅读时间需要 23 分钟。

SSM????????

????????

create table ssm_user(    user_id int primary key auto_increment,    user_name varchar(20),    user_age int,    user_address varchar(30));

???????????

??????????????????IntelliJ IDEA???????????Spring Boot??????????????????????

• src/main/java/com/wangxing/ssm/
  • beans/?Bean???
  • mapper/?MyBatis??????
  • service/??????????
  • controller/????????
  • resources/???????application.properties?mybatis????????

????????

????pom.xml????????

       
        
            
     
      org.springframework
             
     
      spring-context
             
     
      5.1.5.RELEASE
         
        
            
     
      org.springframework
             
     
      spring-jdbc
             
     
      5.1.5.RELEASE
         
        
            
     
      org.springframework
             
     
      spring-tx
             
     
      5.1.5.RELEASE
         
        
        
            
     
      org.mybatis
             
     
      mybatis
             
     
      3.4.6
         
        
            
     
      org.mybatis
             
     
      mybatis-spring
             
     
      1.3.1
         
        
        
            
     
      mysql
             
     
      mysql-connector-java
             
     
      5.1.38
         
        
        
            
     
      com.alibaba
             
     
      druid
             
     
      1.1.7
         
        
        
            
     
      org.springframework
             
     
      spring-webmvc
             
     
      5.1.5.RELEASE
         
        
        
            
     
      com.fasterxml.jackson.core
             
     
      jackson-core
             
     
      2.9.8
         
        
            
     
      com.fasterxml.jackson.core
             
     
      jackson-databind
             
     
      2.9.8
         
        
            
     
      com.fasterxml.jackson.core
             
     
      jackson-annotations
             
     
      2.9.8
         
    
   

????springmvc.xml

????JavaBean

package com.wangxing.ss m.bean;public class UserBean {    private Integer userId;    private String userName;    private Integer userAge;    private String userAddress;    public Integer getUserId() { return userId; }    public void setUserId(Integer userId) { this.userId = userId; }        public String getUserName() { return userName; }    public void setUserName(String userName) { this.userName = (userName == null ? null : userName.trim()); }        public Integer getUserAge() { return userAge; }    public void setUserAge(Integer userAge) { this.userAge = userAge; }        public String getUserAddress() { return userAddress; }    public void setUserAddress(String userAddress) { this.userAddress = (userAddress == null ? null : userAddress.trim()); }}

??????????

package com.wangxing.ss m.mapper;public interface UserBeanMapper {    long countByExample(UserBeanExample example);    int deleteByExample(UserBeanExample example);    int deleteByPrimaryKey(Integer userId);    int insert(UserBean record);    int insertSelective(UserBean record);        List
   
     selectByExample(UserBeanExample example);    UserBean selectByPrimaryKey(Integer userId);        int updateByExampleSelective(UserBean record, UserBeanExample example);    int updateByExample(UserBean record, UserBeanExample example);        int updateByPrimaryKeySelective(UserBean record);    int updateByPrimaryKey(UserBean record);}
   

????????????

package com.wangxing.ss m.service;public interface UserService {    void insertUser(UserBean userBean);    void updateUser(UserBean userBean);    void deleteUser(int userId);    UserBean selectById(int userId);    List
   
     selectAll();}
   

?????

package com.wangxing.ss m.service.impl;import com.wangxing.ss m.bean.UserBean;import com.wangxing.ss m.mapper.UserBeanMapper;import com.wangxing.ss m.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Service("userService")public class UserServiceImpl implements UserService {    @Autowired    private UserBeanMapper userBeanMapper;        @Override    public void insertUser(UserBean userBean) {        userBeanMapper.insert(userBean);    }        @Override    public void updateUser(UserBean userBean) {        userBeanMapper.updateByPrimaryKey(userBean);    }        @Override    public void deleteUser(int userId) {        userBeanMapper.deleteByPrimaryKey(userId);    }        @Override    public UserBean selectById(int userId) {        return userBeanMapper.selectByPrimaryKey(userId);    }        @Override    public List
   
     selectAll() {        return userBeanMapper.selectByExample(null);    }}
   

????????

package com.wangxing.ss m.controller;import com.wangxing.ss m.bean.ResultBean;import com.wangxing.ss m.bean.UserBean;import com.wangxing.ss m.service.UserService;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController@RequestMapping("/user")public class UserController {    @Autowired    private UserService userService;        @RequestMapping("/add.do")    public ResultBean addUser(@RequestBody UserBean userBean) {        try {            userService.insertUser(userBean);            return new ResultBean(true, "????");        } catch (Exception e) {            e.printStackTrace();            return new ResultBean(false, "????");        }    }        @RequestMapping("/update.do")    public ResultBean updateUser(@RequestBody UserBean userBean) {        try {            userService.updateUser(userBean);            return new ResultBean(true, "????");        } catch (Exception e) {            e.printStackTrace();            return new ResultBean(false, "????");        }    }        @RequestMapping("/delete.do")    public ResultBean deleteUser(@RequestParam int userId) {        try {            userService.deleteUser(userId);            return new ResultBean(true, "????");        } catch (Exception e) {            e.printStackTrace();            return new ResultBean(false, "????");        }    }        @RequestMapping("/selectById.do")    public UserBean selectById(int userId) {        try {            return userService.selectById(userId);        } catch (Exception e) {            e.printStackTrace();            return null;        }    }        @RequestMapping("/selectAll.do")    public List
   
     selectAll() {        try {            return userService.selectAll();        } catch (Exception e) {            e.printStackTrace();            return null;        }    }}
   

????

??Postman???????????????

??????????????????????????????