Java 在Jersey 2中流式传输多部分
我目前有Jersey REST代码来流式处理单个文件,效果非常好:Java 在Jersey 2中流式传输多部分,java,json,jersey,streaming,multipart,Java,Json,Jersey,Streaming,Multipart,我目前有Jersey REST代码来流式处理单个文件,效果非常好: StreamingOutput stream = new StreamingOutput() { @Override public void write(OutputStream out) throws IOException { final BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(out);
StreamingOutput stream = new StreamingOutput() {
@Override
public void write(OutputStream out)
throws IOException {
final BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(out);
// Stream is filled with data in this method.
restDAO.readData(bufferedOutputStream);
bufferedOutputStream.flush();
bufferedOutputStream.close();
}
};
return Response.ok(body, mimeType).header("filename", getFileName()).build();
但是,我想流式传输一个包含大文件和JSON的多部分文件,这样做:
FormDataMultiPart multiPart = new FormDataMultiPart();
multiPart.bodyPart(jsonObject, MediaType.APPLICATION_JSON_TYPE);
String mimeType = "application/octet-stream";
StreamingOutput stream = new StreamingOutput() {
@Override
public void write(OutputStream out)
throws IOException {
final BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(out);
// Stream is filled with data in this method.
restDAO.readData(bufferedOutputStream);
bufferedOutputStream.flush();
bufferedOutputStream.close();
}
};
multiPart.bodyPart(stream, MediaTypeUtil.stringToMediaType(mimeType));
return Response.ok(multiPart, MediaType.MULTIPART_FORM_DATA).build();
但是,上述代码不起作用。我在运行javax.ws.rs.BadRequestException:HTTP400错误请求时遇到此错误
是否可以以类似的方式流式传输多部分?我看到的主要问题是,进入多部分的文件来自流本身。为了正确地流式处理多部分,我使用了PipedInputStream和PipedOutStream以及一个线程:
PipedOutputStream pipedOutputStream = new PipedOutputStream();
PipedInputStream pipedInputStream = new PipedInputStream(pipedOutputStream);
final BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(pipedOutputStream);
FormDataMultiPart multiPart = new FormDataMultiPart();
multiPart.bodyPart(jsonObject, MediaType.APPLICATION_JSON_TYPE);
String mimeType = "application/octet-stream";
// Multipart streaming.
// Write to the PipedOutputStream in a separate thread
Runnable runnable = new Runnable() {
public void run() {
try {
restDAO.readData(bufferedOutputStream);
bufferedOutputStream.flush();
bufferedOutputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
};
Thread fileThread = new Thread(runnable, "MultiPartFileStreamer");
fileThread.start();
final StreamDataBodyPart streamDataBodyPart = new StreamDataBodyPart(
"file", pipedInputStream, data.getContentFileName(),
MediaUtils.stringToMediaType(mimeType));
multiPart.bodyPart(streamDataBodyPart);
return Response.ok(multiPart, MediaType.MULTIPART_FORM_DATA).build();