千峰商城-springboot项目实战02-第一个User实体类
0.在SQLyog中创建数据库表users。
1.增加一个User实体类。在entity包中新建一个User类。增加属性,注解。
package com.qfedu.springboot.demo.entity; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import lombok.ToString; @Data @NoArgsConstructor @AllArgsConstructor @ToString public class User { private int userId; private String userName; private String userPwd; private String userRealname; private String userImg; }
2.在UserDAO中写入接口,insert User。
package com.qfedu.springboot.demo.dao; import com.qfedu.springboot.demo.entity.User; public interface UserDAO { public int insertUser(User user); }
3.在mappers包中创建UserMapper.xml。
<?xml version="1.0" encoding="UTF-8" ?> DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mtbatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.qfedu.springboot.demo.dao.UserDAO"> <insert id="insertUser" useGeneratedKeys="true" keyProperty="userId"> insert into users(user_name,user_pwd,user_realname,user_img) values(#{userName},#{userPwd},#{userRealname},#{userImg}) insert> mapper>
4.在demo中新建一个servie包,创建一个UserService接口。
package com.qfedu.springboot.demo.service; import com.qfedu.springboot.demo.entity.User; //用户注册 public interface UserService { public User userRegist(User user); }
5.编写实现类。在service中新建一个Impl包。创建一个UserServiceImpl类。
package com.qfedu.springboot.demo.service.Impl; import com.qfedu.springboot.demo.dao.UserDAO; import com.qfedu.springboot.demo.entity.User; import com.qfedu.springboot.demo.service.UserService; import org.springframework.stereotype.Service; import javax.annotation.Resource; @Service //交给spring管理 public class UserServiceImpl implements UserService { //调dao @Resource //注入 private UserDAO userDAO; //实现。注册成功,返回带有userId的user。注册失败,返回null。public User userRegist(User user) { int i = userDAO.insertUser(user); if (i > 0){ return user; }else { return null; } } }
6.前端提交数据到controller。demo中新建一个controller包,在包中新建一个UserController类。
package com.qfedu.springboot.demo.controller; import com.qfedu.springboot.demo.entity.User; import com.qfedu.springboot.demo.service.UserService; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import javax.annotation.Resource; @Controller @RequestMapping("/user") public class UserController { //通过Resoure注入UserService @Resource private UserService userService; //前后端分离。前端所有消息都是异步请求。 @RequestMapping("/regist") public User regist(User user){ return userService.userRegist(user); } }