Question

我使用Java NIO实现了非阻塞Htttp服务器。它适用于x-www-form-urlencoded POST请求。但是，当我尝试使用大文件的HTTP多部分请求时，它无法正常工作。在那种情况下，服务器无法响应http客户端。这是我的NIO服务器的源代码。

public class TCPServer {

    public static void main(String[] args) {
       TCPServer server = new TCPServer();
       server.listen();
    }

    public void listen() {

        try {

             Selector selector = Selector.open();

             ServerSocketChannel serverSocketChannel = ServerSocketChannel
                .open();

             InetSocketAddress serverAddress = new InetSocketAddress(8080);

             serverSocketChannel.bind(serverAddress);

             serverSocketChannel.configureBlocking(false);

             serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);

             while (true) {

                  selector.select();

                  Set<SelectionKey> selectionKeys = selector.selectedKeys();
                  Iterator<SelectionKey> iterator =  selectionKeys.iterator();

                  while (iterator.hasNext()) {
                      SelectionKey key = iterator.next();

                      if (key.isAcceptable()) {
                          SocketChannel clientSocketChannel =  serverSocketChannel.accept();

                       clientSocketChannel.configureBlocking(false);

                       clientSocketChannel.register(selector,
                            SelectionKey.OP_READ);

                      } else if (key.isReadable()) {
                           SocketChannel clientSocketChannel = null;
                           try {
                               clientSocketChannel = (SocketChannel) key.channel();

                               ByteBuffer clientBuffer = ByteBuffer.allocate(1024);

                               StringBuilder requestStringBuilder = new StringBuilder();

                                int bytesRead = clientSocketChannel
                                .read(clientBuffer); 

                                while (bytesRead > 0) {

                                     clientBuffer.flip();

                                     String result = new String(clientBuffer.array());
                                     requestStringBuilder.append(result);

                                     clientBuffer.compact();

                                     bytesRead = clientSocketChannel.read(clientBuffer);

                                }

                                System.out.println("request-----");
                                System.out
                                  .println(requestStringBuilder.toString());

                                clientSocketChannel.write(ByteBuffer
                                  .wrap("reply from server".getBytes()));

                                clientSocketChannel.register(selector,
                                SelectionKey.OP_WRITE);
                    } catch (Exception e) {
                        System.err.println(e.getMessage());
                        clientSocketChannel.close();
                    }

                } else if (key.isWritable()) {
                    SocketChannel clientSocketChannel = null;
                    try {
                        clientSocketChannel = (SocketChannel) key.channel();
                        clientSocketChannel.close();
                    } catch (Exception e) {
                        System.err.println(e.getMessage());
                        clientSocketChannel.close();
                    }
                }
                iterator.remove();

            }
          }
        }catch (Exception e) {
             System.err.println(e.getMessage());
        }

    }

 }

在Java NIO非阻塞服务器中是否还有其他方法可以处理HTTP多部分请求。如何解决这个问题。感谢。

Answer 1

这与另一个问题类似：Servlet 3.1 - Multipart async processing，但我会在这里回答，因为该解决方案也适用于普通的非阻塞IO。

Synchronoss Technologies最近开源了一个非阻塞的HTTP多部分解析器here。

当您的非阻塞服务器接收数据时，您只需将传入的字节传递给<p:autoComplete value="#{bean.value} multiple="true" completeMethod="#{bean.completeTheme}" forceSelection="false"/>。解析器将为您收到的每个部分的代码进行回调。

免责声明：我为Synchronoss Technologies工作。我们为Servlet 3.1写了这个，但它也应该在常规的非阻塞应用程序中有意义地工作，所以希望其他人会发现这个库很有用。

如何在Java NIO Htttp Server中处理多部分表单数据

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