用到的工具:idea 2021、Maven 3.6.3、postman
框架:SpringBoot、Mybatis
数据库:Mysql8.0.30
安装&配置参考博文
注意:
1.下载maven注意idea与Maven版本的适配:
IDEA 2022 兼容maven 3.8.1及之前的所用版本 IDEA 2021 兼容maven 3.8.1及之前的所用版本 IDEA 2020 兼容Maven 3.6.3及之前所有版本 IDEA 2018 兼容Maven3.6.1及之前所有版本
2.为了避免每次创建项目都要改Maven配置,可以修改idea创建新项目的设置
mysql8安装参考博文
**注意:**连接不上往往是驱动的问题,把对应的驱动下载好即可
新建表
新建字段
添加数据
注意:添加完成后需要提交
Hello SpringBoot 简单启动页面
package com.susu.testsimplespringboot; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; /** * @ClassName HelloController * @Description TODO * @Author susu * @Date 2023/4/9 15:53 * @Version 1.0 */ @Controller public class HelloController { @RequestMapping("/index") public String sayHello() { return "index"; } }
application文件有两种文件格式,一种是以**.properties为后缀,一种是以.yml**为后缀的,两种配置方式略有差别,详情可参考:https://blog.csdn.net/qq_29648651/article/details/78503853;在这我是用.yml后缀的文件格式。右键application文件选择Refact,选择Rename,将后缀改为yml;
spring: datasource: name: test url: jdbc:mysql://localhost:3306/test username: root password: root driver-class-name: com.mysql.cj.jdbc.Driver mybatis: mapper-locations: classpath:mapper/*.xml type-aliases-package: com.susu.testsimplespringboot.DTO.UserLoginDTO
(1)在application配置文件中添加:数据库配置、MyBatis配置:
spring: datasource: name: test url: jdbc:mysql://localhost:3306/test username: root password: root driver-class-name: com.mysql.cj.jdbc.Driver mybatis: mapper-locations: classpath:mapper/*.xml type-aliases-package: com.susu.testsimplespringboot.DTO.UserLoginDTO
(2)pom.xml
4.0.0 org.springframework.boot spring-boot-starter-parent2.7.10 com.susu testSimpleSpringBoot0.0.1-SNAPSHOT testSimpleSpringBoot Demo project for Spring Boot 1.8 org.springframework.boot spring-boot-starter-jdbcorg.springframework.boot spring-boot-starter-thymeleaforg.springframework.boot spring-boot-starter-weborg.mybatis.spring.boot mybatis-spring-boot-starter2.3.0 com.mysql mysql-connector-jruntime org.springframework.boot spring-boot-starter-testtest org.springframework.boot spring-boot-maven-plugin
(3) 实体类
UserLogin
package com.susu.testsimplespringboot.pojo; /** * @ClassName UserLogin * @Description TODO * @Author susu * @Date 2023/4/9 16:25 * @Version 1.0 */ public class UserLogin { private String userAccount; private String userPwd; public String getUserAccount() { return userAccount; } public void setUserAccount(String userAccount) { this.userAccount = userAccount; } public String getUserPwd() { return userPwd; } public void setUserPwd(String userPwd) { this.userPwd = userPwd; } @Override public String toString() { return "UserLogin{" + "userAccount='" + userAccount + '\'' + ", userPwd='" + userPwd + '\'' + '}'; } }
UserLoginDTO (本质也是实体类,这里使用的原因是:数据库三个字段,实体类pojo中只有两个,无法映射,所以根据数据表添加一个三个属性的实体类DTO接收查询结果)
package com.susu.testsimplespringboot.DTO; /** * @ClassName UserLoginDTO * @Description TODO * @Author susu * @Date 2023/4/9 16:49 * @Version 1.0 */ public class UserLoginDTO { private int userNo; private String userAccount; private String userPwd; public int getUserNo() { return userNo; } public void setUserNo(int userNo) { this.userNo = userNo; } public String getUserAccount() { return userAccount; } public void setUserAccount(String userAccount) { this.userAccount = userAccount; } public String getUserPwd() { return userPwd; } public void setUserPwd(String userPwd) { this.userPwd = userPwd; } }
(4)mapper接口
package com.susu.testsimplespringboot.mapper; import com.susu.testsimplespringboot.DTO.UserLoginDTO; import org.apache.ibatis.annotations.Mapper; /** * @ClassName UserMapper * @Description TODO * @Author susu * @Date 2023/4/9 16:27 * @Version 1.0 */ @Mapper public interface UserMapper { public abstract UserLoginDTO selectUserInfo(String userAccount, String userPwd); }
(5)mapper映射文件(这个文件可以设置成idea自动提示的模板,避免每次都要自己写,方法如下图)
注意!!!
namespace、id的属性值
namespace:mapper接口名;
id:mapper接口中抽象方法的名字
mybatis映射文件的一些技术点可参考下面的博文
https://blog.csdn.net/zxdspaopao/article/details/112919320
(6)service接口
package com.susu.testsimplespringboot.service; import com.susu.testsimplespringboot.pojo.UserLogin; /** * @ClassName UserService * @Description TODO * @Author susu * @Date 2023/4/9 16:27 * @Version 1.0 */ public interface UserService { public abstract UserLogin loginCheck(String userAccount, String userPwd); }
(6)service实现类
package com.susu.testsimplespringboot.serviceImpl; import com.susu.testsimplespringboot.DTO.UserLoginDTO; import com.susu.testsimplespringboot.service.UserService; import com.susu.testsimplespringboot.mapper.UserMapper; import com.susu.testsimplespringboot.pojo.UserLogin; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; /** * @ClassName UserServiceImpl * @Description TODO * @Author susu * @Date 2023/4/9 16:37 * @Version 1.0 */ @Service public class UserServiceImpl implements UserService { @Autowired UserMapper userMapper; @Override public UserLogin loginCheck(String userAccount, String userPwd) { UserLoginDTO userLoginDTO = userMapper.selectUserInfo(userAccount, userPwd); UserLogin userLogin = new UserLogin(); if (userLoginDTO != null) { userLogin.setUserAccount(userLoginDTO.getUserAccount()); userLogin.setUserPwd(userLoginDTO.getUserPwd()); } return userLogin; } }
(7)到此时,可以在测试类测试下Mapper层是否可以正常获取数据
package com.susu.testsimplespringboot; import com.susu.testsimplespringboot.pojo.UserLogin; import com.susu.testsimplespringboot.service.UserService; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; @SpringBootTest class TestSimpleSpringBootApplicationTests { @Autowired UserService userService; @Test void contextLoads() { UserLogin userLogin = userService.loginCheck("huahua", "123"); System.out.println(userLogin); } }
(8)controller
package com.susu.testsimplespringboot.controller; import com.susu.testsimplespringboot.DTO.UserLoginDTO; import com.susu.testsimplespringboot.pojo.UserLogin; import com.susu.testsimplespringboot.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*; /** * @ClassName LoginController * @Description TODO * @Author susu * @Date 2023/4/9 16:27 * @Version 1.0 */ @Controller //@ResponseBody public class LoginController { @Autowired UserService userService; /** * @param testGetStaticSource * @param index * @return */ @RequestMapping("{testGetStaticSource}/{index}") public String getStaticSource(@PathVariable String testGetStaticSource, @PathVariable String index) { return testGetStaticSource + "/" + index; } @GetMapping(value = "login") public String login() { return "login"; } @GetMapping(value = "loginIn") public String loginGet(String userAccount, String userPwd) { UserLogin user1 = userService.loginCheck(userAccount, userPwd); if (user1 != null) { return "success"; } else { return "error"; } } @PostMapping(value = "loginIn") public String loginPost(UserLoginDTO userLoginDTO) { UserLogin user1 = userService.loginCheck(userLoginDTO.getUserAccount(), userLoginDTO.getUserPwd()); if (user1 != null) { return "success"; } else { return "error"; } } }
注意:
1.@RequestMapping,任何请求方式都可以
2.@GetMapping,只能Get请求(前端请求方式如下所示)
3.@PostMapping,只能Post请求
3.1 用postman发送post请求参考博文
3.2前端json格式报文:
{ "userAccount":"huahua", "userPwd":"123" }
4.测试了获取templates文件下的静态资源
@RequestMapping("{testGetStaticSource}/{index}") public String getStaticSource(@PathVariable String testGetStaticSource, @PathVariable String index) { return testGetStaticSource + "/" + index; }
细节可以参考如下两篇博文
https://blog.csdn.net/zhuzicc/article/details/105465814#%E9%97%AE%E9%A2%98%E5%8E%9F%E5%9B%A0
https://blog.csdn.net/weixin_53106424/article/details/123502419
此处涉及springmvc的原理:
可以参考博文:
https://blog.csdn.net/weixin_53106424/article/details/115309018?spm=1001.2014.3001.5502
(9)几个静态文件
9.1 login.html
login
9.2 success.html
success 登录成功
9.3 error.html
eoor 登录失败