JAXB 在 writeTo 方法中写入 OutputStream

发布于 2024-10-15 04:26:30 字数 726 浏览 6 评论 0原文

我一直在尝试在 MessageBodyWriter 接口的 writeTo 实现方法内直接将 String 写入 OutputStream 。我想在 try catch 块内执行此操作，以便在捕获异常时发送消息。然而，当我调试程序时，我意识到字符串永远不会被写入OutputStream（大小= -1）。

代码看起来像这样：

public void writeTo(final Object entityObject, final Class<?> aClass, final Type type,
                        final Annotation[] annotations, final MediaType mediaType,
                        final MultivaluedMap<String, Object> stringObjectMultivaluedMap,
                        final OutputStream outputStream) throws IOException, WebApplicationException {
   try{
     throw new JAXBException("error");
   }catch(JAXBException j){
     outputStream.write("HI".getBytes());
     outputStream.flush();
   }

原文

I have been trying to write a String directly to OutputStream inside the writeTo implementation method of MessageBodyWriter interface. I want to do this inside a try catch block to send a message when an exception gets caught. However, when I debug through the program, I realize that the String never gets written to the OutputStream (size = -1).

The code looks something like this:

public void writeTo(final Object entityObject, final Class<?> aClass, final Type type,
                        final Annotation[] annotations, final MediaType mediaType,
                        final MultivaluedMap<String, Object> stringObjectMultivaluedMap,
                        final OutputStream outputStream) throws IOException, WebApplicationException {
   try{
     throw new JAXBException("error");
   }catch(JAXBException j){
     outputStream.write("HI".getBytes());
     outputStream.flush();
   }

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挥剑断情 2024-10-22 04:26:30

新答案

您可以利用从 MessageBodyWriter 中的 writeTo 方法抛出的 WebApplicationException。

public void writeTo(DataObject dataObject, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> multivaluedMap, OutputStream outputStream) throws IOException, WebApplicationException {
    try {
        throw new JAXBException("error");
    } catch(JAXBException e) {
        Response response = Response.status(Response.Status.INTERNAL_SERVER_ERROR)
                                     .entity("HI")
                                     .type("text/plain")
                                     .build();
        throw new WebApplicationException(response);
    }
}

原始答案

在我看来，您最好从 MessageBodyWriter 中抛出 JAXBException，然后创建一个 ExceptionMapper 来记录问题：

@Provider
public class JAXBExceptionMapper implements ExceptionMapper<JAXBException> {

    public Response toResponse(JAXBException e) {
        return Response.status(Response.Status.INTERNAL_SERVER_ERROR)
                       .entity(e.getMessage());
                       .type("text/plain").build();
    }

}

这将允许您返回一个指示发生问题的响应代码。

NEW ANSWER

You could leverage the WebApplicationException that can be thrown from the writeTo method in MessageBodyWriter.

public void writeTo(DataObject dataObject, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> multivaluedMap, OutputStream outputStream) throws IOException, WebApplicationException {
    try {
        throw new JAXBException("error");
    } catch(JAXBException e) {
        Response response = Response.status(Response.Status.INTERNAL_SERVER_ERROR)
                                     .entity("HI")
                                     .type("text/plain")
                                     .build();
        throw new WebApplicationException(response);
    }
}

ORIGINAL ANSWER

In my opinion you are better of throwing the JAXBException from the MessageBodyWriter, and then creating an ExceptionMapper to log the problem:

@Provider
public class JAXBExceptionMapper implements ExceptionMapper<JAXBException> {

    public Response toResponse(JAXBException e) {
        return Response.status(Response.Status.INTERNAL_SERVER_ERROR)
                       .entity(e.getMessage());
                       .type("text/plain").build();
    }

}

This will allow you to return a response code that indicates that a problem occurred.

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