初始化

src/main/java/com/nkkj/ups/UpsApplication.java

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+package com.nkkj.ups;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+@MapperScan("com.nkkj.ups.dao")
+public class UpsApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(UpsApplication.class, args);
+    }
+
+}

src/main/java/com/nkkj/ups/controller/LoginController.java

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+package com.nkkj.ups.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class LoginController {
+}

src/main/java/com/nkkj/ups/service/LoginService.java

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+package com.nkkj.ups.service;
+
+public interface LoginService {
+    User login(String username, String password);
+}

src/main/java/com/nkkj/ups/service/impl/LoginServiceImpl.java

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+package com.nkkj.ups.service.impl;
+
+import com.nkkj.ups.service.LoginService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class LoginServiceImpl implements LoginService {
+    @Autowired
+    UserMapper userMapper;
+    @Override
+    public User login(String username, String password) {
+        User user=userMapper.selectOneByNameAndPassword(username,password);
+        return user;
+    }
+}

src/main/resources/application.properties

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+spring.application.name=ups
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+spring.datasource.username=root
+spring.datasource.password=123456
+spring.datasource.url=jdbc:mysql://localhost:3306/ups?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8