GZIPWriterInterceptor.java 文件源码

@Override
public void aroundWriteTo(WriterInterceptorContext context) throws IOException {


    MultivaluedMap<String, Object> responseHeaders = context.getHeaders();
    Object rangeHeader = responseHeaders.getFirst("Content-Range");

    // Use a custom header here
    // Some clients needs to know the content length in response headers in order to display a loading state
    // Browsers don't let programmers to change the default "Accept-Encoding" header, then we use a custom one.
    String acceptEncoding = requestHeaders.getHeaderString("x-accept-encoding");

    GZIPOutputStream gzipOutputStream = null;

    if (acceptEncoding != null && acceptEncoding.equals("identity")) {
        responseHeaders.add("Content-Encoding", "identity");
    } else if (rangeHeader == null) {
        responseHeaders.add("Content-Encoding", "gzip");
        responseHeaders.remove("Content-Length");
        gzipOutputStream = new GZIPOutputStream(context.getOutputStream(), DEFAULT_BUFFER_SIZE);
        context.setOutputStream(gzipOutputStream);
    }

    try {
        context.proceed();
    } finally {
        if (gzipOutputStream != null) {
            gzipOutputStream.finish();
        }
    }
}