J2EE工具类：ClientSocketUtil.java&ServerSocketConnection.java

客户端：

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;

public class ClientSocketUtil {

	protected static Socket server;
//	private String url="";
//	private int port=9766;
	private boolean isConnected=true;
	public ClientSocketUtil(int port){//链接自己，本机上测试的时候用
		try {
			server = new Socket(InetAddress.getLocalHost(), port);
		} catch (Exception e) {
			isConnected=false;
		} 
	}
	public ClientSocketUtil(String url,int port){
		try {
			server = new Socket(url,port);
		} catch (Exception e) {
			isConnected=false;
		} 
	}
//		 向服务端程序发送数据
	public void send(String data){
		try {
			OutputStreamWriter osw = new OutputStreamWriter(server.getOutputStream());
			BufferedWriter bw = new BufferedWriter(osw);
			bw.write(data+"\r\n");
			bw.flush();
//			DataOutputStream dos=new DataOutputStream(server.getOutputStream());
//			dos.write(data.getBytes());
//			dos.flush();
		} catch (IOException e) {
		}
	}
	/**
	 * 从服务端程序接收数据,返回一个BufferedReader
	 * @return
	 */
	public BufferedReader recieve(){
		InputStreamReader isr=null;
		BufferedReader br=null;
		try {
			isr = new InputStreamReader(server.getInputStream(),"GBK");
			br = new BufferedReader(isr);
		} catch (IOException e) {
		}
		return br;
	}

	public void close(){
		 try {
			 if(server!=null||server.isConnected()){
				 server.close();
			 }
		} catch (IOException e) {
		}
	}
	public boolean isConnected() {
		return isConnected;
	}
	public void setConnected(boolean isConnected) {
		this.isConnected = isConnected;
	}
	
	public static void main(String[] args) {
		ClientSocketUtil util=new ClientSocketUtil(9766);
		util.send("aaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbcccccccccccccccccccccccccc");
		BufferedReader br=util.recieve();
		String s = "";        
        try {
			while((s = br.readLine()) != null)
			    System.out.println(s);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		util.close();
	}
	
}

模拟服务器端：

import java.io.*;
import java.net.*;
import java.util.List;
import java.util.Map;

import com.worthtech.app.util.Constants;

public class ServerSocketConnection extends  Thread{
	private Socket client;
	
	ServerSocketConnection(Socket client){
		this.client=client;
	}
	public void run(){
		try {
			BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
			PrintWriter out = new PrintWriter(client.getOutputStream());
//			while (true) {
				String data = in.readLine();
				System.out.println("『服务器收到』"+data);
				///////////////////////////////////////////////////////
				String[] s=new String[11];
				int pos=0;
				s[0]=data.substring(pos,6);
				pos+=6;
				s[1]=data.substring(pos, 12);
				pos+=6;
				s[2]=data.substring(pos, 24);
				pos+=12;
				s[3]=data.substring(pos, 39);
				pos+=15;
				s[4]=data.substring(pos, 51);
				pos+=12;
				s[5]=data.substring(pos, 59);
				pos+=8;
				s[6]=data.substring(pos, 71);
				pos+=12;
				s[7]=data.substring(pos, 87);
				pos+=16;
				s[8]=data.substring(pos, 105);
				pos+=18;
				s[9]=data.substring(pos, 112);
				pos+=7;
				s[10]=data.substring(pos, 117);
				pos+=5;
				for(int i=0;i<s.length;i++){
					
					System.out.println("s"+i+"="+s[i]);
				}
//				DBConnection db = new DBConnection();
//				String sql="select * from user where phone='"+phone+"'";
//				List list=null;
//				try {
//					db.getCurrentConnection();
//					list = db.executeQueryList(sql);
//				} catch (Exception e) {
//					// TODO Auto-generated catch block
//					e.printStackTrace();
//				}
////				System.out.println("list.size="+list.size());
//				db.closeCurrentConnection();
//				if(list==null||list.size()==0){//没有记录
//					out.println("没有查到该数据。");//向客户端发送
//				}else{
//					String password=(String) ((Map)list.get(0)).get("password");
//					out.println("您的密码为："+password+"，请妥善保存！");//向客户端发送
//				}
				out.println("服务器成功收到数据！");//向客户端发送
//				out.println("服务器收到了，这是返回信息。");//向客户端发送
				///////////////////////////////////////////////////////
				out.flush();
				System.out.println("---------send success-----------");
//				if (str.equals("end"))
//					break;
//			}
			
			client.close();
		} catch (IOException ex) {
		} finally {
			
		}
	}

	public static void main(String[] args) throws IOException{
		//这个程序的主要目的在于服务器不断接收客户机所写入的信息只到。客户机发送"End"字符串就退出程序。
		//并且服务器也会做出"Receive"为回应。告知客户机已接收到消息。多线程
		ServerSocket server=new ServerSocket(Constants.port);
		while(true){
			ServerSocketConnection ssc=new ServerSocketConnection(server.accept());
			ssc.start();
		}

	}

}