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本文作者:低调小熊猫
文章链接:https://aodeng.cc/archives/springbootshiers
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简介
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
使用
配置类
/**
* @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);
}
}
创建CustomException 继承 RuntimeException类
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;
}
}
创建ErrorResponseEntity实体类,用存放异常信息
public class CustomException extends RuntimeException{
private static final long serialVersionUID = -8400239090334588012L;
private int code;
public CustomException(){
super();
}
//忽略get,set
}
测试
@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;
}
}
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