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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