Java使用TCP协议获取XML及其处理

本示例使用Java模拟Socket服务器端，由客户端向服务器发送请求信息后，获取服务器XML信息，然后解析处理。

1、Socket服务器端

import java.net.*;
import java.io.*;

public class TCPServer {
	public static void main(String args[])
	{
		try{
			int serverPort=7896;
			ServerSocket listenSocket=new ServerSocket(serverPort);
			while(true)
			{
				Socket clientSocket=listenSocket.accept();
				Connection c=new Connection(clientSocket);
			}
		}
		catch(IOException e){System.out.println("Listen:"+e.getMessage());}

	}

}

class Connection extends Thread
{
	DataInputStream in;
	DataOutputStream out;
	Socket clientSocket;
	public Connection(Socket aClientSocket)
	{
		try{
			clientSocket=aClientSocket;
			in=new DataInputStream(clientSocket.getInputStream());
			out=new DataOutputStream(clientSocket.getOutputStream());
			this.start();
		}
		catch(IOException e)
		{System.out.println("Connection:"+e.getMessage());}
	}
	public void run()
	{
		try{ 
			String data=in.readUTF();
			//out.writeUTF(data);
			if(data.equals("ABC")){
				out.writeUTF("<result><!-- code: 0 - error, 1 - success --><code>0</code><weight>111.33</weight><unit>kg</unit><errmsg></errmsg></result>");
			}
		}
		catch(EOFException e){System.out.println("EOF:"+e.getMessage());}
		catch(IOException e){System.out.println("IO:"+e.getMessage());}
		finally {try{clientSocket.close();} catch(IOException e){/*关闭失败*/}}
	}
	
}

2、客户端向服务器发送请求，然后获取XML串。

//测试TCP通讯
	protected void onBoReadNoTest() throws Exception {
		Socket soc = null;
		InputStreamReader isr = null;// 定义一个可读输入流
		String data = "";
		BufferedReader bf = null;// 定义一个BufferedReader类型的读内容的引用
		InetAddress addr = InetAddress.getByName("127.0.0.1");
		int serverPort = 7896;
		if (addr.isReachable(5000)) {
			System.out.println("SUCCESS - ping " + addr
					+ " with no interface specified");
			try {
				soc = new Socket(addr, serverPort);
				System.out.println("Socket Success!");
				DataInputStream in = new DataInputStream(soc.getInputStream());
				DataOutputStream out=new DataOutputStream(soc.getOutputStream());
				out.writeUTF("ABC");
				//BufferedReader brin  = new BufferedReader(new InputStreamReader(soc.getInputStream()));
				System.out.println("DataInputStream Success!");
				data = in.readUTF();
				//System.out.println("接收到的数据:" + brin.readLine());
//				isr = new InputStreamReader(soc.getInputStream());// 创建一个来自套接字soc的可读输入流
//				bf = new BufferedReader(isr);// 把soc的可读输入流作为参数创建一个BufferedReader
//				data = bf.readLine();// 以每行为单位读取从客户端发来的数据
				System.out.println("接收到的数据:" + data);
				this.DOM(data);
				//in.close();
			} catch (UnknownHostException e) {
				System.out.println("Socket Error:" + e.getMessage());
			} catch (EOFException e) {
				System.out.println("EOF:" + e.getMessage());
			} catch (IOException e) {
				System.out.println("IO:" + e.getMessage());
			} finally {
				if (soc != null)
					try {
						soc.close();
					} catch (IOException e) {/* close failed */
					}
			}
		} else {
			System.out.println("FAILURE - ping " + addr
					+ " with no interface specified");
		}

	}

3、XML解析处理

//DOM解析方法
	public void DOM(String data) {  
        long lasting = System.currentTimeMillis();  
  
        try {  
            //File f = new File("F:/xmltest.xml");  
//        	FileInputStream fis=new FileInputStream("data.xml");
//        	BufferedInputStream bis=new BufferedInputStream(fis);
//        	DataInputStream dis=new DataInputStream(bis);

        	byte[] b = data.getBytes();
        	InputStream inp = new ByteArrayInputStream(b);
        	
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();  
            DocumentBuilder builder = factory.newDocumentBuilder();  
            Document doc = builder.parse(inp);  
            NodeList nl = doc.getElementsByTagName("result");  
            for (int i = 0; i < nl.getLength(); i++) {  
                System.out.println("||code:  |"+ doc.getElementsByTagName("code").item(i).getFirstChild().getNodeValue());   
                System.out.println("||weight:  |"+ doc.getElementsByTagName("weight").item(i).getFirstChild().getNodeValue());  
                System.out.println("||unit:  |"+ doc.getElementsByTagName("unit").item(i).getFirstChild().getNodeValue());  
                System.out.println("||errmsg:  |"+ doc.getElementsByTagName("errmsg").item(i).getFirstChild().getNodeValue()); 
                }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        System.out.println("DOM RUNTIME："  
                + (System.currentTimeMillis() - lasting) + " MS");  
    }  

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