实现登录，编写错误码，实现错误码返回json

src/main/java/com/fjy/spring/controller/LoginController.java

@@ -6,7 +6,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestParam;
 
 @Controller
 public class LoginController {
@@ -14,16 +13,16 @@ public class LoginController {
     @Autowired
     private UserService userService;
 
-    @GetMapping("/index")
+    @GetMapping(value = {"index",""})
     public String toLoginPage(){
         return "login";
     }
 
     @PostMapping("/login/dologin")
-    public boolean doLogin(TbUser tbUser){
+    public String doLogin(TbUser tbUser)throws Exception{
         if (userService.doLoginService(tbUser.getColname(),tbUser.getColpassword())){
-            return true;
+            return "home";
         }
-        return false;
+        return "login";
     }
 }

src/main/java/com/fjy/spring/domain/Result.java

@@ -0,0 +1,34 @@
+package com.fjy.spring.domain;
+
+/**
+ * Http请求返回的最外层对象
+ */
+public class Result<T> {
+    private Integer code;
+    private String message;
+    private T data;
+
+    public Integer getCode() {
+        return code;
+    }
+
+    public void setCode(Integer code) {
+        this.code = code;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    public T getData() {
+        return data;
+    }
+
+    public void setData(T data) {
+        this.data = data;
+    }
+}

src/main/java/com/fjy/spring/enums/ResultEnum.java

@@ -0,0 +1,28 @@
+package com.fjy.spring.enums;
+
+public enum ResultEnum {
+    UNKOWN_ERROR(-1,"未知错误"),
+    SUCCESS(0,"请求成功"),
+    USER_NOTEXIST(101,"用户不存在"),
+    UPDATE_ERROR(102,"更新失败"),
+    DELETE_ERROR(103,"删除失败"),
+    ADD_ERROR(104,"添加失败"),
+    WRONGPASS(105,"用户名或密码错误"),
+    ILLEGAL_ACCESS(106,"非法访问")
+    ;
+    private Integer code;
+    private String msg;
+
+    public Integer getCode() {
+        return code;
+    }
+
+    public String getMsg() {
+        return msg;
+    }
+
+    ResultEnum(Integer code, String msg) {
+        this.code = code;
+        this.msg = msg;
+    }
+}

src/main/java/com/fjy/spring/exception/UserException.java

@@ -0,0 +1,17 @@
+package com.fjy.spring.exception;
+
+import com.fjy.spring.enums.ResultEnum;
+
+public class UserException extends RuntimeException{
+
+    private Integer code;
+
+    public UserException(ResultEnum resultEnum) {
+        super(resultEnum.getMsg());
+        this.code = resultEnum.getCode();
+    }
+
+    public Integer getCode() {
+        return code;
+    }
+}

src/main/java/com/fjy/spring/handle/ExceptionHandle.java

@@ -0,0 +1,28 @@
+package com.fjy.spring.handle;
+
+import com.fjy.spring.domain.Result;
+import com.fjy.spring.enums.ResultEnum;
+import com.fjy.spring.exception.UserException;
+import com.fjy.spring.untils.ResultUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@ControllerAdvice
+public class ExceptionHandle {
+    private final static Logger logger = LoggerFactory.getLogger(ExceptionHandle.class);
+
+    @ExceptionHandler(value = Exception.class)
+    @ResponseBody
+    public Result handle(Exception e){
+        if (e instanceof UserException){
+            UserException userException = (UserException)e;
+            return ResultUtil.error(userException.getCode(),userException.getMessage());
+        }else{
+            logger.error("系统异常",e);
+            return ResultUtil.error(ResultEnum.UNKOWN_ERROR.getCode(),ResultEnum.UNKOWN_ERROR.getMsg());
+        }
+    }
+}

src/main/java/com/fjy/spring/service/UserService.java

@@ -1,6 +1,8 @@
 package com.fjy.spring.service;
 
 import com.fjy.spring.domain.TbUser;
+import com.fjy.spring.enums.ResultEnum;
+import com.fjy.spring.exception.UserException;
 import com.fjy.spring.repository.TbUserRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
@@ -17,6 +19,6 @@ public class UserService {
         if (password.equals(user.getColpassword())){
             return true;
         }
-        return false;
+        throw new UserException(ResultEnum.USER_NOTEXIST);
     }
 }

src/main/java/com/fjy/spring/untils/ResultUtil.java

@@ -0,0 +1,12 @@
+package com.fjy.spring.untils;
+
+import com.fjy.spring.domain.Result;
+
+public class ResultUtil {
+    public static Result error(Integer code,String msg){
+        Result result = new Result();
+        result.setCode(code);
+        result.setMessage(msg);
+        return result;
+    }
+}