private void uploadsShouldWork(boolean casUpload, EmbeddedChannel ch, HttpResponseStatus status)
    throws Exception {
  ByteArrayInputStream data = new ByteArrayInputStream(new byte[] {1, 2, 3, 4, 5});
  ChannelPromise writePromise = ch.newPromise();
  ch.writeOneOutbound(new UploadCommand(CACHE_URI, casUpload, "abcdef", data, 5), writePromise);

  HttpRequest request = ch.readOutbound();
  assertThat(request.method()).isEqualTo(HttpMethod.PUT);
  assertThat(request.headers().get(HttpHeaders.CONNECTION))
      .isEqualTo(HttpHeaderValues.KEEP_ALIVE.toString());

  HttpChunkedInput content = ch.readOutbound();
  assertThat(content.readChunk(ByteBufAllocator.DEFAULT).content().readableBytes()).isEqualTo(5);

  FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, status);
  response.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);

  ch.writeInbound(response);

  assertThat(writePromise.isDone()).isTrue();
  assertThat(ch.isOpen()).isTrue();
}
 

/** Test that the handler correctly supports http error codes i.e. 404 (NOT FOUND). */
@Test
public void httpErrorsAreSupported() {
  EmbeddedChannel ch = new EmbeddedChannel(new HttpUploadHandler(null, ImmutableList.of()));
  ByteArrayInputStream data = new ByteArrayInputStream(new byte[] {1, 2, 3, 4, 5});
  ChannelPromise writePromise = ch.newPromise();
  ch.writeOneOutbound(new UploadCommand(CACHE_URI, true, "abcdef", data, 5), writePromise);

  HttpRequest request = ch.readOutbound();
  assertThat(request).isInstanceOf(HttpRequest.class);
  HttpChunkedInput content = ch.readOutbound();
  assertThat(content).isInstanceOf(HttpChunkedInput.class);

  FullHttpResponse response =
      new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.FORBIDDEN);
  response.headers().set(HttpHeaders.CONNECTION, HttpHeaderValues.CLOSE);

  ch.writeInbound(response);

  assertThat(writePromise.isDone()).isTrue();
  assertThat(writePromise.cause()).isInstanceOf(HttpException.class);
  assertThat(((HttpException) writePromise.cause()).response().status())
      .isEqualTo(HttpResponseStatus.FORBIDDEN);
  assertThat(ch.isOpen()).isFalse();
}
 

/**
 * Test that the handler correctly supports http error codes i.e. 404 (NOT FOUND) with a
 * Content-Length header.
 */
@Test
public void httpErrorsWithContentAreSupported() {
  EmbeddedChannel ch = new EmbeddedChannel(new HttpUploadHandler(null, ImmutableList.of()));
  ByteArrayInputStream data = new ByteArrayInputStream(new byte[] {1, 2, 3, 4, 5});
  ChannelPromise writePromise = ch.newPromise();
  ch.writeOneOutbound(new UploadCommand(CACHE_URI, true, "abcdef", data, 5), writePromise);

  HttpRequest request = ch.readOutbound();
  assertThat(request).isInstanceOf(HttpRequest.class);
  HttpChunkedInput content = ch.readOutbound();
  assertThat(content).isInstanceOf(HttpChunkedInput.class);

  ByteBuf errorMsg = ByteBufUtil.writeAscii(ch.alloc(), "error message");
  FullHttpResponse response =
      new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.NOT_FOUND, errorMsg);
  response.headers().set(HttpHeaders.CONNECTION, HttpHeaderValues.KEEP_ALIVE);

  ch.writeInbound(response);

  assertThat(writePromise.isDone()).isTrue();
  assertThat(writePromise.cause()).isInstanceOf(HttpException.class);
  assertThat(((HttpException) writePromise.cause()).response().status())
      .isEqualTo(HttpResponseStatus.NOT_FOUND);
  assertThat(ch.isOpen()).isTrue();
}
 

/**
 * 输出文件响应
 * 
 * @param responseEntity
 * @return
 * @throws IOException
 */
private ChannelFuture writeFileResponse(ResponseEntity<?> responseEntity) throws IOException {
    RandomAccessFile raf = (RandomAccessFile) responseEntity.getBody();
    long fileLength = raf.length();
    
    HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
    HttpUtil.setContentLength(response, fileLength);
    if(responseEntity.getMimetype() != null && !responseEntity.getMimetype().trim().equals("")) {
        response.headers().set(HttpHeaderNames.CONTENT_TYPE, responseEntity.getMimetype());
    }
    if(responseEntity.getFileName() != null && !responseEntity.getFileName().trim().equals("")) {
        String fileName = new String(responseEntity.getFileName().getBytes("gb2312"), "ISO8859-1");
        response.headers().set(HttpHeaderNames.CONTENT_DISPOSITION, "attachment; filename=" + fileName); 
    }
    if (HttpUtil.isKeepAlive(HttpContextHolder.getRequest())) {
        response.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);
    }
    
    ChannelHandlerContext ctx = HttpContextHolder.getResponse().getChannelHandlerContext();
    ctx.write(response);
    ChannelFuture sendFileFuture;
    ChannelFuture lastContentFuture = null;
    if (ctx.pipeline().get(SslHandler.class) == null) {
        sendFileFuture =
                ctx.write(new DefaultFileRegion(raf.getChannel(), 0, fileLength), ctx.newProgressivePromise());
        // Write the end marker.
        lastContentFuture = ctx.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT);
    } else {
        sendFileFuture = ctx.writeAndFlush(new HttpChunkedInput(new ChunkedFile(raf, 0, fileLength, 8192)),
                ctx.newProgressivePromise());
        // HttpChunkedInput will write the end marker (LastHttpContent) for us.
        lastContentFuture = sendFileFuture;
    }
    return lastContentFuture;
}
 

@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise)
    throws Exception {
  checkState(userPromise == null, "handler can't be shared between pipelines.");
  userPromise = promise;
  if (!(msg instanceof UploadCommand)) {
    failAndResetUserPromise(
        new IllegalArgumentException(
            "Unsupported message type: " + StringUtil.simpleClassName(msg)));
    return;
  }
  HttpRequest request = buildRequest((UploadCommand) msg);
  addCredentialHeaders(request, ((UploadCommand) msg).uri());
  HttpChunkedInput body = buildBody((UploadCommand) msg);
  ctx.writeAndFlush(request)
      .addListener(
          (f) -> {
            if (f.isSuccess()) {
              return;
            }
            failAndClose(f.cause(), ctx);
          });
  ctx.writeAndFlush(body)
      .addListener(
          (f) -> {
            if (f.isSuccess()) {
              return;
            }
            failAndClose(f.cause(), ctx);
          });
}
 

@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise)
    throws Exception {
  checkState(userPromise == null, "handler can't be shared between pipelines.");
  userPromise = promise;
  if (!(msg instanceof UploadCommand)) {
    failAndResetUserPromise(
        new IllegalArgumentException(
            "Unsupported message type: " + StringUtil.simpleClassName(msg)));
    return;
  }
  UploadCommand cmd = (UploadCommand) msg;
  path = constructPath(cmd.uri(), cmd.hash(), cmd.casUpload());
  contentLength = cmd.contentLength();
  HttpRequest request = buildRequest(path, constructHost(cmd.uri()), contentLength);
  addCredentialHeaders(request, cmd.uri());
  addExtraRemoteHeaders(request);
  addUserAgentHeader(request);
  HttpChunkedInput body = buildBody(cmd);
  ctx.writeAndFlush(request)
      .addListener(
          (f) -> {
            if (f.isSuccess()) {
              return;
            }
            failAndClose(f.cause(), ctx);
          });
  ctx.writeAndFlush(body)
      .addListener(
          (f) -> {
            if (f.isSuccess()) {
              return;
            }
            failAndClose(f.cause(), ctx);
          });
}
 

private HttpChunkedInput buildBody(UploadCommand msg) {
  return new HttpChunkedInput(new ChunkedStream(msg.data()));
}
 

private HttpChunkedInput buildBody(UploadCommand msg) {
  return new HttpChunkedInput(new ChunkedStream(msg.data()));
}