>全局异常处理的方式。 这个我之前做营销网站的时候就想搞了，那时异常处理有点乱，重复代码很多，想想我自己也有点问题，没有往这方面想，现在想想有点后悔，希望以后别再犯类似的错。 统一异常处理加起来倒是不麻烦，可以减少重复代码，让看来更简洁易懂。 下面的代码只是粗略写写，实际应用中需要进行适当修改，但是思路是一样的。 ### 1、定义枚举类 ResultCodeEnum ```Java @Getter public enum ResultCodeEnum { /** * 错误定义 */ SUCCESS(1000, "成功!"), BODY_NOT_MATCH(4000,"请求的数据格式不符!"), NOT_FOUND(4004, "未找到该资源!"), INTERNAL_SERVER_ERROR(5000, "服务器内部错误!"), SERVER_BUSY(5003,"服务器正忙，请稍后再试!"), SERVER_ERROR(9997,"业务异常"); private final int resultCode; private final String resultMsg; private ResultCodeEnum(int resultCode, String resultMsg) { this.resultCode = resultCode; this.resultMsg = resultMsg; } } ``` >这里只是粗略写一下。 ### 2、自定义异常类 BizException ```Java @Data public class BizException extends RuntimeException { private final Integer resultCode; private final String resultMsg; public BizException() { this.resultCode = ResultCodeEnum.SERVER_ERROR.getResultCode(); this.resultMsg = ResultCodeEnum.SERVER_ERROR.getResultMsg(); } public BizException(ResultCodeEnum resultCodeEnum) { this.resultCode = resultCodeEnum.getResultCode(); this.resultMsg = resultCodeEnum.getResultMsg(); } public BizException(ResultCodeEnum resultCodeEnum, String msg) { this.resultCode = resultCodeEnum.getResultCode(); this.resultMsg = resultCodeEnum.getResultMsg(); } public BizException(int resultCode, String resultMsg) { this.resultCode = resultCode; this.resultMsg = resultMsg; } } ``` ### 3、定义返回类 BaseResponse ```Java @Data public class BaseResponse { private Integer resultCode; private String resultMsg; public BaseResponse() { this.resultCode = ResultCodeEnum.SUCCESS.getResultCode(); this.resultMsg = ResultCodeEnum.SUCCESS.getResultMsg(); } public BaseResponse(ResultCodeEnum resultCodeEnum) { this.resultCode = resultCodeEnum.getResultCode(); this.resultMsg = resultCodeEnum.getResultMsg(); } public BaseResponse(ResultCodeEnum resultCodeEnum, String msg) { this.resultCode = resultCodeEnum.getResultCode(); this.resultMsg = msg; } public BaseResponse(int resultCode, String resultMsg) { this.resultCode = resultCode; this.resultMsg = resultMsg; } } ``` ### 4、定义全局异常处理类 >切记要加注解 @RestControllerAdvice ```Java @Slf4j @RestControllerAdvice public class GlobalExceptionHandler { public GlobalExceptionHandler() { } @ExceptionHandler({Throwable.class}) public BaseResponse handleThrowable(Throwable e) { log.error(e.getMessage(), e); return new BaseResponse(ResultCodeEnum.SERVER_ERROR.getResultCode(), e.getMessage()); } @ExceptionHandler({Exception.class}) public BaseResponse handleException(Exception e) { log.error(e.getMessage(), e); return new BaseResponse(ResultCodeEnum.SERVER_BUSY.getResultCode(), e.getMessage()); } @ExceptionHandler(value =NullPointerException.class) public BaseResponse exceptionHandler(NullPointerException e){ log.error(e.getMessage(), e); return new BaseResponse(ResultCodeEnum.BODY_NOT_MATCH); } @ExceptionHandler({BizException.class}) public BaseResponse handleBizException(BizException e) { return new BaseResponse(e.getResultCode(), e.getResultMsg()); } @ExceptionHandler({IOException.class}) public BaseResponse handleIoException(IOException e) { log.error(e.getMessage(), e); return new BaseResponse(ResultCodeEnum.SERVER_ERROR.getResultCode(), "IO异常！"); } } ``` ### 5、测试 ```Java @Slf4j @RestController public class TestController { @PostMapping("test") public String test(@RequestBody User user) { if (user.getName() == null) { throw new BizException(4001, "name 参数不能为空"); } return "success!"; } } ```  代码结构如下：