如何通过套接字InputStream发送XML数据

Question

我正在尝试使用基于XML的协议用Java编写客户端服务器应用程序。但是我有一个大问题！

参见客户端代码的这一部分：

InputStream incoming = skt.getInputStream(); //I get Stream from Socket.
OutputStream out = skt.getOutputStream();

[...]

XMLSerializer serializer = new XMLSerializer();
//This create an XML document.
tosend = WUTPClientWriter.createMessage100(projectid, cpuclock, cpunumber);
serializer.setOutputByteStream(out);
serializer.serialize(tosend);

此时服务器陷入僵局。它等待EOF，但我无法发送它，因为如果使用

out.close();

要么

skt.shutdownOutput();

我关闭了套接字，并且必须保持此连接有效。

我无法在服务器中收到“解析错误”，因此无法发送“ \ 0”。

我该怎么做？我可以在不关闭套接字的情况下“关闭”输出流吗？

解决方法 我创建了具有高级Stream手势的新类XMLStreamOutput和XMLStreamInput。

Answer 1

我已经解决了这四个课程：

1）

public class XMLOutputStream extends  ByteArrayOutputStream {

 private DataOutputStream outchannel;

 public XMLOutputStream(OutputStream outchannel) {
     super();
     this.outchannel = new DataOutputStream(outchannel);
 }

 public void send() throws IOException {
     byte[] data = toByteArray();
     outchannel.writeInt(data.length);
     outchannel.write(data);
     reset();
 }
}

2）

public class XMLSender {

 public static void send(Document tosend, OutputStream channel) throws   TransformerConfigurationException, IOException {
     XMLOutputStream out = new XMLOutputStream(channel);

     StreamResult sr = new StreamResult(out);
     DOMSource ds = new DOMSource(tosend);
     Transformer tf = TransformerFactory.newInstance().newTransformer();

     try {
         tf.transform(ds, sr);
     } catch (TransformerException ex) {
         Logger.getLogger(XMLSender.class.getName()).log(Level.SEVERE, null, ex);
     }

     out.send();
 }
}

3）

public class XMLInputStream extends ByteArrayInputStream {

 private DataInputStream inchannel;

 public XMLInputStream(InputStream inchannel) {
     super(new byte[2]); 
     this.inchannel = new DataInputStream(inchannel);
 }

 public void recive() throws IOException {
     int i = inchannel.readInt(); 
     byte[] data = new byte[i];
     inchannel.read(data, 0, i); 
     this.buf = data; 
     this.count = i;
     this.mark = 0;
     this.pos = 0;
 }

}

4）

public class XMLReceiver {

 public static Document receive(InputStream channel) throws ParserConfigurationException, TransformerConfigurationException, IOException, SAXException {

     DocumentBuilderFactory docBuilderFact = DocumentBuilderFactory.newInstance();
     DocumentBuilder docBuilder = docBuilderFact.newDocumentBuilder();
     Document request = null;


     XMLInputStream xmlin = new XMLInputStream(channel);

     xmlin.recive();

     request = docBuilder.parse(xmlin);

     return request;
 }
}