登录控制

demo/src/main/java/com/example/demo/loginService/API/UserService.java

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+package com.example.demo.loginService.API;
+
+import com.example.demo.bean.User;
+
+public interface UserService {
+    public User selectUserByuserName(String userName);
+}

demo/src/main/java/com/example/demo/loginService/API/impl/UserServiceImpl.java

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+package com.example.demo.loginService.API.impl;
+
+import com.example.demo.Dao.userMapper;
+import com.example.demo.bean.User;
+import com.example.demo.loginService.API.UserService;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service("UserServiceImpl")
+public class UserServiceImpl implements UserService{
+    private userMapper UserMapper;
+    @Transactional(propagation=Propagation.REQUIRED,readOnly = true)
+    public User selectUserByuserName(String userName){
+        return this.UserMapper.selectUserByuserName(userName);
+    }
+}

demo/src/main/java/com/example/demo/loginService/UserController.java

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+package com.example.demo.loginService;
+
+import com.example.demo.bean.User;
+import com.example.demo.loginService.API.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PostMapping;
+
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+
+@Controller
+public class UserController extends HttpServlet{
+    @Autowired
+    private UserService userService;
+    @PostMapping("/Login.do")
+    public String doPost1(HttpServletRequest request, HttpServletResponse response){
+        String userName=request.getParameter("userName");
+        String userPwd=request.getParameter("userPwd");
+        User user=this.userService.selectUserByuserName(userName);
+        if(user!=null){
+            if(user.getUserPwd().equals(userPwd)){
+                return "/login1";
+            }
+            else{
+                return "/login2";
+            }
+        }else{
+            return "/login2";
+        }
+    }
+}

demo/src/main/resources/application.yml

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+spring:
+  mvc:
+    view:
+      prefix: /WEB-INF双击查看原图iews/
+      suffix: .jsp
+  datasource:
+    url: jdbc:mysql://localhost:3307/panda?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
+    username: root
+    password: 123
+    driver-class-name: com.mysql.cj.jdbc.Driver
+mybatis:
+  type-aliases-package: com.example.demo.Dao