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本文作者:低调小熊猫
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通常在Controller层需要去捕获service层的异常,防止返回一些不友好的错误信息到客户端,但如果Controller层每个方法都用模块化的try-catch代码去捕获异常,会很难看也难维护,所以使用全局异常比较方便
这方法是springboot封装好了的,我们直接使用即可,普通的配置我就不贴了
/** * @program:hope * @author:aodeng * @create:2018-10-10 14:15 **/ @RestControllerAdvice //该注解将异常以json格式输出 public class GlobalExceptionHandler extends ResponseEntityExceptionHandler{ /*** *定义要普获的异常 * @param request * @param e * @param response * @return */ @ExceptionHandler(CustomException.class) public ExceptionEntity customExceptionEntity(HttpServletRequest request, final Exception e, HttpServletResponse response){ response.setStatus(HttpStatus.BAD_REQUEST.value()); CustomException customException=(CustomException)e; return new ExceptionEntity(customException.getCode(),customException.getMessage()); } /*** * 捕获 RuntimeException 异常 * 如果你觉得在一个 exceptionHandler 通过 if (e instanceof xxxException) 太麻烦 * 那么你还可以自己写多个不同的 exceptionHandler 处理不同异常 * @param request * @param e * @param response * @return */ @ExceptionHandler(RuntimeException.class) public ExceptionEntity runtimeExceptionEntity(HttpServletRequest request,final Exception e,HttpServletResponse response){ response.setStatus(HttpStatus.BAD_REQUEST.value()); RuntimeException runtimeException=(RuntimeException)e; return new ExceptionEntity(400,runtimeException.getMessage()); } /*** * Override ResponseEntityExceptionHandler类中的handleExceptionInternal方法 * 通用的接口映射异常处理方 * @param e * @param o * @param httpHeaders * @param httpStatus * @param webRequest * @return */ @Override protected ResponseEntity<Object> handleExceptionInternal(Exception e, Object o, HttpHeaders httpHeaders, HttpStatus httpStatus, WebRequest webRequest){ if (e instanceof MethodArgumentNotValidException){ MethodArgumentNotValidException methodArgumentNotValidException=(MethodArgumentNotValidException)e; return new ResponseEntity<>(new ExceptionEntity(httpStatus.value(),methodArgumentNotValidException.getBindingResult().getAllErrors().get(0).getDefaultMessage()),httpStatus); } if(e instanceof MethodArgumentTypeMismatchException){ MethodArgumentTypeMismatchException methodArgumentTypeMismatchException=(MethodArgumentTypeMismatchException)e; logger.error("参数转换失败,方法:"+methodArgumentTypeMismatchException.getParameter().getMethod().getName()+",参数:"+ methodArgumentTypeMismatchException.getName()+",信息:"+methodArgumentTypeMismatchException.getLocalizedMessage()); return new ResponseEntity<>(new ExceptionEntity(httpStatus.value(),"参数转换失败"),httpStatus); } return new ResponseEntity<>(new ExceptionEntity(httpStatus.value(),"参数转换失败"),httpStatus); } }
public class CustomException extends RuntimeException{ private static final long serialVersionUID = -8400239090334588012L; private int code; public CustomException(){ super(); } public CustomException(int code,String message){ super(message); this.setCode(code); } public int getCode() { return code; } public void setCode(int code) { this.code = code; } }
public class CustomException extends RuntimeException{ private static final long serialVersionUID = -8400239090334588012L; private int code; public CustomException(){ super(); } //忽略get,set }
@RestController public class TestController { @GetMapping("/test") public String test(Integer number){ if (null == number){ throw new CustomException(110,"number不能为空,其实是400"); } int i=100/ number; return "你输入的数字缩小100倍是:"+i; } }