Spring Boot教程九：捕获全局异常（二）

1、在执行@RequestMapping时，进入逻辑处理阶段前。譬如传的参数类型错误@ControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler{

/**
* 在controller里面内容执行之前，校验一些参数不匹配啊，Get post方法不对啊之类的
*/
@Override
protected ResponseEntity<Object> handleExceptionInternal(Exception ex, Object body, HttpHeaders headers, HttpStatus status, WebRequest request) {
return new ResponseEntity<Object>(new ApiResult(ResultCode.METHOD_NOT_ALLOWED.getCode(),ResultMessage.METHOD_NOT_ALLOWED.getMessage()), status);

}

}

2、在进入Controller之前，譬如请求一个不存在的地址，404错误。

@RestController
public class FinalExceptionHandler implements ErrorController {

@Override
public String getErrorPath() {
return "/error";
}

@RequestMapping(value = "/error")
@ResponseBody
public ApiResult error(HttpServletResponse resp, HttpServletRequest req) {
// 错误处理逻辑
return new ApiResult(ResultCode.NO_URL.getCode(),ResultMessage.NO_URL.getMessage());
}

}