springboot|springboot 自定义异常并捕获异常返给前端的实现代码 springboot自定义异常并捕获异常

背景在开发中，如果用try catch的方式，每个方法都需要单独实现，为了方便分类异常，返回给前端，采用了@ControllerAdvice注解和继承了RuntimeException的方式来实现。
实现内容 【springboot|springboot 自定义异常并捕获异常返给前端的实现代码】捕获了三类异常
1.业务异常
BusinessException
2.系统异常
SystemException
3.其他异常
利用@ExceptionHandler(RuntimeException.class)去捕获
ExceptionAdvice类捕获以上三类异常，并返回自定义类型格式数据
实现代码业务异常BusinessException类实现方式，继承RuntimeException

public class BusinessException extendsRuntimeException { /*** 错误编码*/ private String code; public BusinessException() {super(); } public BusinessException(String message) {super(message); } public BusinessException(String code, String message) {super(message); this.code = code; } public BusinessException(Throwable cause) {super(cause); } public BusinessException(String message, Throwable cause) {super(message, cause); } public BusinessException(String message, Throwable cause,boolean enableSuppression, boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace); } public String getCode() {return code; } public void setCode(String code) {this.code = code; } @Override public String getMessage() {return super.getMessage(); } @Override public String toString() {return this.code + ":" + this.getMessage(); }}

系统异常SystemException类实现方式，继承RuntimeException，同业务异常类的实现方式一样

public class SystemException extendsRuntimeException { /*** 错误编码*/ private String code; public SystemException() {super(); } public SystemException(String message) {super(message); } public SystemException(String code, String message) {super(message); this.code = code; } public SystemException(Throwable cause) {super(cause); } public SystemException(String message, Throwable cause) {super(message, cause); } public SystemException(String message, Throwable cause,boolean enableSuppression, boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace); } public String getCode() {return code; } public void setCode(String code) {this.code = code; } @Override public String getMessage() {return super.getMessage(); } @Override public String toString() {return this.code + ":" + this.getMessage(); }}

ExceptionAdvice类，采用增强Controller注解 @ControllerAdvice的方式来实现
1.方法名称和返回类型都可以根据自己需要定义；
2.采用注解@ExceptionHandler，就是捕获的异常类型，我们只需要把需要捕获异常类型写进来就好

springboot|springboot 自定义异常并捕获异常返给前端的实现代码

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ExceptionAdvice 具体代码实现如下：

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; @ControllerAdvicepublic class ExceptionAdvice {public static Logger logger = LoggerFactory.getLogger(ExceptionAdvice.class); @ResponseBody@ExceptionHandler(SystemException.class)public Result handleException(Exception e) {logger.error("系统异常信息：", e); Result result = new Result(); if (e instanceof BusinessException) {e = (BusinessException) e; result.setCode(((BusinessException) e).getCode()); }result.setFailed(e.getMessage()); return result; } @ExceptionHandler(RuntimeException.class)@ResponseBodypublic Result handleException(RuntimeException e) {logger.error("异常信息：", e.getMessage()); Result result = new Result(); result.setStatus(500); result.setMessage(e.getMessage()); return result; } @ExceptionHandler(BusinessException.class)@ResponseBodypublic AjaxJson doBusinessException(Exception e) {AjaxJson ajaxJson = new AjaxJson(); logger.error("业务异常消息：", e.getMessage()); ajaxJson.setRet(-1); ajaxJson.setMsg(e.getMessage()); return ajaxJson; } }

测试代码 1.我们捕获一个业务异常BusinessException，输出aaa