未在JAX-RS中执行的针对4xx错误的过滤器

编程问答 2022-08-14

问题描述

我已经实现了用于拦截请求/响应的ContainerRequestFilter，ContainerResponseFilter。对于正常的请求/响应来说，这很好。

但是对于4xx错误，过滤器不会执行/触发。我尝试使用@PreMatching过滤器，并将@Priority设置为尽可能低的值，但仍然发现过滤器未执行。

我还必须能够捕获以下错误的请求/响应正文：

   BAD_REQUEST(400,"Bad Request"),UNAUTHORIZED(401,"Unauthorized"),FORBIDDEN(403,"Forbidden"),NOT_FOUND(404,"Not Found"),NOT_ACCEPTABLE(406,"Not Acceptable"),CONFLICT(409,"Conflict"),GONE(410,"Gone"),PRECONDITION_Failed(412,"Precondition Failed"),UNSUPPORTED_MEDIA_TYPE(415,"Unsupported Media Type")

有没有办法在过滤器中实现这一目标？

编辑：添加过滤器代码。

@Provider
@PreMatching
@Priority(20)
public class LoggingFilter implements ContainerRequestFilter,ContainerResponseFilter,WriterInterceptor {

    private static final Logger LOGGER = LoggerFactory.getLogger(LoggingFilterTrial.class);

    @Override
    public void filter(ContainerRequestContext reqContext) throws IOException {
        logRequest(reqContext);
    }

    @Override
    public void filter(ContainerRequestContext containerRequestContext,ContainerResponseContext containerResponseContext) throws IOException {
        // aroundWriteto will not be called for empty body
        if(containerResponseContext.getEntity() == null) {
            logResponse(null,containerRequestContext);
        }
    }

    @Override
    public void aroundWriteto(WriterInterceptorContext context)
        throws IOException,WebApplicationException {
            logResponse(context,null);
    }

    private void logRequest(ContainerRequestContext reqContext)
        throws IOException {
            //body
            byte[] requestBody = getRequestBody(reqContext);
    }

    private void logResponse(WriterInterceptorContext context,ContainerRequestContext reqContext)
        throws IOException {

            byte[] responseBody = new byte[0];
            //we pass context as null for empty body
            if (context != null) {
                responseBody = getResponseBody(context);
            }
    }


    private byte[] getRequestBody(ContainerRequestContext reqContext) throws IOException {
            byte[] reqBytes = IoUtils.toByteArray(reqContext.getEntityStream());
            InputStream in = new ByteArrayInputStream(reqBytes);
            reqContext.setEntityStream(in);
            return reqBytes;
    }

    private byte[] getResponseBody(WriterInterceptorContext context) throws IOException {
        OutputStream originalStream = context.getoutputStream();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        context.setoutputStream(baos);
        try {
            context.proceed();
        } finally {
            baos.writeto(originalStream);
            baos.close();
            context.setoutputStream(originalStream);
        }
        return baos.toByteArray();
    }
}

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