java socket实例

java socket

 

代码：

 

package com.socketTest;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * socket 长连接类
 * 
 * @author rebin
 * @version 1.0
 * @object noka tag
 * @web http://www.97521.com
 */
public class Nksocket extends Thread {
	public String ip = null;// 连接服务器的IP
	public Integer port = null;// 连接服务器的端口
	private Socket socket = null;// 套节字对象
	private boolean close = false; // 关闭连接标志位，true表示关闭，false表示连接
	private Integer sotimeout = 1 * 1 * 1000;// 超时时间，以毫秒为单位
	// ------------------------------------------------------------------------------

	public Nksocket() {
		init();
	}

	public Nksocket(String ip, Integer port) {
		setIp(ip);
		setPort(port);
		init();
	}

	/**
	 * 初始化socket对象
	 */
	public void init() {
		try {
			InetAddress address = InetAddress.getByName(getIp());
			socket = new Socket(address, getPort());
			socket.setKeepAlive(true);// 开启保持活动状态的套接字
			socket.setSoTimeout(sotimeout);// 设置超时时间
			close = !Send(socket, "2");// 发送初始数据，发送成功则表示已经连接上，发送失败表示已经断开
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 读数据线程
	 */
	public void run() {
		while (true) {
			// ---------读数据---------------------------
			close = isServerClose(socket);// 判断是否断开
			if (!close) {// 没有断开，开始读数据
				String readtext = ReadText(socket);
				/*add dy dirk.zhang*/
				WriteText(socket, "dirk.zhang写入bat数据");
				
				if (readtext != null && readtext.trim().length() > 0) {
					System.out.println("读取数据：" + readtext);
				}
			}
			// ---------创建连接-------------------------
			while (close) {// 已经断开，重新建立连接
				try {
					System.out.println("重新建立连接：" + getIp() + ":" + getPort());
					InetAddress address = InetAddress.getByName(getIp());
					socket = new Socket(address, getPort());
					socket.setKeepAlive(true);
					socket.setSoTimeout(sotimeout);
					close = !Send(socket, "2");
					System.out.println("建立连接成功：" + getIp() + ":" + getPort());
				} catch (Exception se) {
					System.out.println("创建连接失败:" + getIp() + ":" + getPort());
					close = true;
				}
			}
		}
	}

	/**
	 * 发送数据，发送失败返回false,发送成功返回true
	 * 
	 * @param csocket
	 * @param message
	 * @return
	 */
	public Boolean Send(Socket csocket, String message) {
		try {
			PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
			out.println(message);
			return true;
		} catch (Exception se) {
			se.printStackTrace();
			return false;
		}
	}

	/**
	 * 读取socket中数据
	 * 读取数据，返回字符串类型
	 * @param csocket
	 * @return
	 */
	public String ReadText(Socket csocket) {
		try {
			csocket.setSoTimeout(sotimeout);
			InputStream input = csocket.getInputStream();
			BufferedReader in = new BufferedReader(new InputStreamReader(input));
			char[] sn = new char[1000];
			in.read(sn);
			String sc = new String(sn);
			return sc;
		} catch (IOException se) {
			return null;
		}
	}
	
	private Boolean WriteText(Socket csocket, String context)
	{
		DataOutputStream output = null;
		try{
			output = new DataOutputStream(csocket.getOutputStream());
			output.writeUTF(context);
			return true;
		}
		catch(Exception e){
			return false;
		}
		finally{
			if(output!=null){
				try {
					output.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			System.out.println("finally 执行了");
		}
	}

	/**
	 * 判断是否断开连接，断开返回true,没有返回false
	 * 
	 * @param socket
	 * @return
	 */
	public Boolean isServerClose(Socket socket) {
		try {
			socket.sendUrgentData(0);// 发送1个字节的紧急数据，默认情况下，服务器端没有开启紧急数据处理，不影响正常通信
			return false;
		} catch (Exception se) {
			return true;
		}
	}

	/**
	 * 测试
	 * 
	 * @param ags
	 */
	public static void main(String[] ags) {
		Nksocket nksocket = new Nksocket("localhost", 10006);
		nksocket.start();
	}

	// ------------------------------------------------------------------------------
	public String getIp() {
		return ip;
	}

	public void setIp(String ip) {
		this.ip = ip;
	}

	public Integer getPort() {
		return port;
	}

	public void setPort(Integer port) {
		this.port = port;
	}
}