當請求沒有“內容型別”HTTP請求標頭時，嘗試讓SpringBoot應用程式發送錯誤回應訊息

我仍然是 Spring Boot 的新手，但我有一個 Web 應用程式，它被設定為處理 XML 請求（當請求具有“內容型別：應用程式/xml”標頭時，或 JSON 請求時（當請求具有“Content-type: application/xml”標頭），我注意到如果“Content-type”標頭丟失或包含“Content-type: application/xml”或“Content-type: application/ json”，我收到“415”回應錯誤代碼。日志記錄還顯示如下訊息：

.w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/x-www-form-urlencoded' not supported]

我找到了這個較舊的 SO 執行緒：

Springboot 例外處理程式不捕獲例外

并且一直在嘗試實施“Sannu”于 2016 年 12 月 17 日 13:55 發布的代碼。這是我構建并正在測驗的代碼（作為測驗，我試圖將錯誤回應代碼更改為“500”并且還有一條錯誤回應訊息）：

import org.apache.logging.log4j.LogManager;

import org.springframework.http.ResponseEntity;
import org.springframework.web.HttpMediaTypeNotSupportedException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver;

import mil.nga.geoaxis.pdp.models.ErrorResponse;

import org.springframework.http.HttpStatus;


@ControllerAdvice  
public class SpringExceptionHandler extends ExceptionHandlerExceptionResolver
{
    @ExceptionHandler(org.springframework.web.HttpMediaTypeNotSupportedException.class)
    public ResponseEntity<Object>     handleControllerException(HttpMediaTypeNotSupportedException ex, WebRequest req)
{
    ErrorResponse errorResponse = null;
    //ex.printStackTrace();
    errorResponse = new ErrorResponse();
    errorResponse.setCode(HttpCodes.HTTP_CODE_INTERNAL_ERROR);
    System.out.println("In SpringExceptionHandler.handleControllerException: HttpStatus.INTERNAL_SERVER_ERROR.value()=["   HttpStatus.INTERNAL_SERVER_ERROR.value()   "]");
    System.out.println("In SpringExceptionHandler.handleControllerException: ex.getMessage()=["   ex.getMessage()   "]");
    int myCode = errorResponse.getCode();
    System.out.println("In SpringExceptionHandler.handleControllerException: errorResponse.getCode()/String.valueOf(myCode)=["   String.valueOf(myCode)   "]");

    
    errorResponse.setCode(HttpStatus.INTERNAL_SERVER_ERROR.value());
    errorResponse.setMessage(ex.getMessage());

    myCode = errorResponse.getCode();
    System.out.println("In SpringExceptionHandler.handleControllerException: errorResponse.getCode()/String.valueOf(myCode)=["   String.valueOf(myCode)   "]");

    return new ResponseEntity<Object>(errorResponse, HttpStatus.valueOf(errorResponse.getCode()));
    
}
}

但是，當我測驗并發送沒有“Content-type:”標頭的請求（使用 curl）時，我仍然收到看似帶有“100”回應代碼的回應，然后是帶有“415”回應的回應代碼，并且沒有回應訊息。

僅供參考，這是出現的日志記錄的一部分：

In SpringExceptionHandler.handleControllerException: HttpStatus.INTERNAL_SERVER_ERROR.value()=[500]
In SpringExceptionHandler.handleControllerException: ex.getMessage()=[Content type 'application/x-www-form-urlencoded' not supported]
In SpringExceptionHandler.handleControllerException: errorResponse.getCode()/String.valueOf(myCode)=[0]
In SpringExceptionHandler.handleControllerException: errorResponse.getCode()/String.valueOf(myCode)=[500]
WARN 15428 --- [io-18443-exec-1] .m.m.a.ExceptionHandlerExceptionResolver : Failure in @ExceptionHandler      ....errorhandling.SpringExceptionHandler#handleControllerException(HttpMediaTypeNotSupportedException, WebRequest)

誰能建議為什么這似乎無法發送錯誤代碼和回應訊息？

[僅供參考，我在 Spring Boot 2.5.6 下執行此操作。]

提前致謝！

吉姆

編輯 1：我根據 huy 的建議修改了課程：

import org.apache.logging.log4j.LogManager;

import org.springframework.http.ResponseEntity;
import org.springframework.web.HttpMediaTypeNotSupportedException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver;



@ControllerAdvice  
public class SpringExceptionHandler 
{
    @ExceptionHandler(org.springframework.web.HttpMediaTypeNotSupportedException.class)
public ResponseEntity handleControllerException(HttpMediaTypeNotSupportedException ex, WebRequest req)
{
    ErrorResponse errorResponse = null;
    //ex.printStackTrace();
    errorResponse = new ErrorResponse();
    //errorResponse.setCode(HttpCodes.HTTP_CODE_INTERNAL_ERROR);
    System.out.println("In SpringExceptionHandler.handleControllerException: HttpStatus.INTERNAL_SERVER_ERROR.value()=["   HttpStatus.INTERNAL_SERVER_ERROR.value()   "]");
    System.out.println("In SpringExceptionHandler.handleControllerException: ex.getMessage()=["   ex.getMessage()   "]");
    int myCode = errorResponse.getCode();
    System.out.println("In SpringExceptionHandler.handleControllerException: errorResponse.getCode()/String.valueOf(myCode)=["   String.valueOf(myCode)   "]");

    
    errorResponse.setCode(HttpStatus.INTERNAL_SERVER_ERROR.value());
    errorResponse.setMessage(ex.getMessage());

    myCode = errorResponse.getCode();
    System.out.println("In SpringExceptionHandler.handleControllerException: errorResponse.getCode()/String.valueOf(myCode)=["   String.valueOf(myCode)   "]");

    return ResponseEntity
            .status(HttpStatus.valueOf(415))
            .body(ex.getMessage());
    
}
}

The code above causes a response with error code 415, and the text error message from the HttpMediaTypeNotSupportedException exception.

uj5u.com熱心網友回復：

您不需要擴展 ExceptionHandlerException...，它默認用于解決錯誤。

你只需要 ControllerAdvice 和 ExceptionHandler，ExceptionHandlerExceptionResolver 會自動掃描注解 ExceptionHandler 并處理它。

標籤：java spring-boot

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