Springboot @RestControllerAdvice全局异常捕获处理

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一、@RestControllerAdvice

@RestControllerAdvice是Spring框架提供的一个注解，用于定义全局异常处理器和全局数据绑定设置。它结合了@ControllerAdvice和@ResponseBody两个注解的功能。
通过在@RestControllerAdvice类中定义异常处理方法，我们可以捕获和处理控制器中抛出的异常，提供自定义的异常处理逻辑，以及返回适当的响应给客户端。

二、案例

1.自定义异常

package com.easyblog.exception;import com.easyblog.entity.enums.ResponseCodeEnum;public class BusinessException extends RuntimeException {private ResponseCodeEnum codeEnum;private Integer code;private String message;public BusinessException(String message, Throwable e) {super(message, e);this.message = message;}public BusinessException(String message) {super(message);this.message = message;}public BusinessException(Throwable e) {super(e);}public BusinessException(ResponseCodeEnum codeEnum) {super(codeEnum.getMsg());this.codeEnum = codeEnum;this.code = codeEnum.getCode();this.message = codeEnum.getMsg();}public BusinessException(Integer code, String message) {super(message);this.code = code;this.message = message;}public ResponseCodeEnum getCodeEnum() {return codeEnum;}public Integer getCode() {return code;}@Overridepublic String getMessage() {return message;}/*** 重写fillInStackTrace 业务异常不需要堆栈信息，提高效率.*/@Overridepublic Throwable fillInStackTrace() {return this;}}

2.自定义相应常量

package com.easyblog.entity.enums;public enum ResponseCodeEnum {CODE_200(200, "请求成功"),CODE_404(404, "请求地址不存在"),CODE_600(600, "请求参数错误"),CODE_601(601, "信息已经存在"),CODE_602(602, "信息提交过多"),CODE_500(500, "服务器返回错误，请联系管理员"),CODE_900(900, "http请求超时"),CODE_901(901, "登录超时，请重新登录");private Integer code;private String msg;ResponseCodeEnum(Integer code, String msg) {this.code = code;this.msg = msg;}public Integer getCode() {return code;}public String getMsg() {return msg;}
}

3.自定义响应类

package com.easyblog.result;import lombok.Data;/*** 全局统一返回结果类*/
@Datapublic class Result<T> {private Integer code;private String message;private T data;public Result(){}protected static <T> Result<T> build(T data) {Result<T> result = new Result<T>();if (data != null)result.setData(data);return result;}public static <T> Result<T> build(T body, ResultCodeEnum resultCodeEnum) {Result<T> result = build(body);result.setCode(resultCodeEnum.getCode());result.setMessage(resultCodeEnum.getMessage());return result;}public static <T> Result<T> build(Integer code, String message) {Result<T> result = build(null);result.setCode(code);result.setMessage(message);return result;}public static<T> Result<T> ok(){return Result.ok(null);}/*** 操作成功* @param data* @param <T>* @return*/public static<T> Result<T> ok(T data){Result<T> result = build(data);return build(data, ResultCodeEnum.SUCCESS);}public static<T> Result<T> fail(){return Result.fail(null);}/*** 操作失败* @param data* @param <T>* @return*/public static<T> Result<T> fail(T data){Result<T> result = build(data);return build(data, ResultCodeEnum.FAIL);}public Result<T> message(String msg){this.setMessage(msg);return this;}public Result<T> code(Integer code){this.setCode(code);return this;}public boolean isOk() {if(this.getCode().intValue() == ResultCodeEnum.SUCCESS.getCode().intValue()) {return true;}return false;}
}

4.核心逻辑

package com.easyblog.exception;
import com.easyblog.entity.enums.ResponseCodeEnum;
import com.easyblog.result.Result;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.NoHandlerFoundException;import javax.servlet.http.HttpServletRequest;
/*** 全局异常捕获* 可以捕获和处理控制器中抛出的异常，提供自定义的异常处理逻辑，以及返回适当的响应给客户端。* **/
@RestControllerAdvice
public class GlobalExceptionHandlerController {@ExceptionHandler(value = Exception.class)Object handleException(Exception e, HttpServletRequest request) {Result response=new Result<>();//404if (e instanceof NoHandlerFoundException) {response.setCode(ResponseCodeEnum.CODE_404.getCode());response.setMessage(ResponseCodeEnum.CODE_404.getMsg());} else if (e instanceof BusinessException) {//业务错误BusinessException biz = (BusinessException) e;response.setCode(biz.getCode());if (biz.getCode() == null) {response.setCode(ResponseCodeEnum.CODE_600.getCode());}response.setMessage(biz.getMessage());} else if (e instanceof BindException) {//参数类型错误response.setCode(ResponseCodeEnum.CODE_600.getCode());response.setMessage(ResponseCodeEnum.CODE_600.getMsg());} else if (e instanceof DuplicateKeyException) {//主键冲突response.setCode(ResponseCodeEnum.CODE_601.getCode());response.setMessage(ResponseCodeEnum.CODE_601.getMsg());} else {response.setCode(ResponseCodeEnum.CODE_500.getCode());response.setMessage(ResponseCodeEnum.CODE_500.getMsg());}return response;}
}

其中@ExceptionHandler：用于指定异常处理方法。当与@RestControllerAdvice配合使用时，用于全局处理控制器里的异常。

5.测试

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