SpringMVC异常处理知识点总结

<parent>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-parent</artifactId>  <version>2.1.9.RELEASE</version>  <relativePath/> <!-- lookup parent from repository --></parent><dependencies>  <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-web</artifactId>  </dependency></dependencies>

package com.mozq.mybatisplus.mybatisplus01.exception;import com.mozq.mybatisplus.mybatisplus01.model.CommonCode;import com.mozq.mybatisplus.mybatisplus01.model.Result;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.ResponseBody;@ControllerAdvicepublic class ExceptionCatch {  @ExceptionHandler(Exception.class)  @ResponseBody  public Result handleException(Exception e){    return Result.of(CommonCode.SERVER_ERROR);  }  @ExceptionHandler(CustomException.class)  @ResponseBody  public Result handleException(CustomException e){    return Result.of(e.getResultCode());  }}

package com.mozq.mybatisplus.mybatisplus01.exception;import com.mozq.mybatisplus.mybatisplus01.model.ResultCode;public class CustomException extends RuntimeException {  private ResultCode resultCode;  public CustomException(ResultCode resultCode){    super("错误码：" + resultCode.code() + "错误消息：" + resultCode.message());    this.resultCode = resultCode;  }  public ResultCode getResultCode(){    return resultCode;  }}

@RestController@RequestMapping("/demo")public class DemoController {  //单个参数非空校验，使用@RequestParam  @RequestMapping("/get")  public String getName(@RequestParam String name){    return name;  }  /*  public Result myCustomException(boolean flag)  不传参数默认false  0-false 1-true 其他数字抛异常 MethodArgumentTypeMismatchException  正确方式：  localhost:8080/demo/myCustomException?flag=1  localhost:8080/demo/myCustomException?flag=true  */  @RequestMapping("/myCustomException")  public Result myCustomException(boolean flag){    if(flag){      throw new CustomException(UserCode.USER_NOT_EXIST);    }    return Result.ok();  }}

package com.mozq.mybatisplus.mybatisplus01.model;import lombok.Data;import java.util.LinkedHashMap;@Datapublic class Result extends LinkedHashMap {  private static final String SUCCESS = "success";  private static final String CODE = "code";  private static final String MESSAGE = "message";  private static final String RESULT = "result";  public static Result of(ResultCode resultCode){    Result R = new Result();    R.put(SUCCESS, resultCode.success());    R.put(CODE, resultCode.code());    R.put(MESSAGE, resultCode.message());    return R;  }  public static Result ok(){    return Result.of(CommonCode.SUCCESS);  }  public static Result okWithResult(Object data){    Result R = Result.of(CommonCode.SUCCESS);    R.put(RESULT, data);    return R;  }  public static Result fail(){    return Result.of(CommonCode.FAIL);  }}

package com.mozq.mybatisplus.mybatisplus01.model;public interface ResultCode {  boolean success();  String code();  String message();}

package com.mozq.mybatisplus.mybatisplus01.model;public enum CommonCode implements ResultCode {  SUCCESS(true, "000000", "处理成功"),  FAIL(true, "000001", "处理失败"),  INVALID_PARAM(false, "100000", "无效的参数"),  SERVER_ERROR(false, "999999", "系统忙，请稍后重试");  private boolean success;  private String code;  private String message;  CommonCode(boolean success, String code, String message){    this.success = success;    this.code = code;    this.message = message;  }  @Override  public boolean success() {    return success;  }  @Override  public String code() {    return code;  }  @Override  public String message() {    return message;  }}

package com.mozq.mybatisplus.mybatisplus01.model;public enum UserCode implements ResultCode {  USER_USERNAME_ALREADY_EXIST(false, "200000", "用户名已经存在"),  USER_TELEPHONE_ALREADY_USED(false, "200001", "电话号码已经存在"),  USER_NOT_EXIST(false, "200002", "用户不存在");  private boolean success;  private String code;  private String message;  UserCode(boolean success, String code, String message){    this.success = success;    this.code = code;    this.message = message;  }  @Override  public boolean success() {    return success;  }  @Override  public String code() {    return code;  }  @Override  public String message() {    return message;  }}