基于UDP的手机与电脑互相通信的简单实例

今天来写一个基于UDP协议的手机与电脑互相通信的简单例子，废话不多说直接上代码，注释写的很明白了，就不多解释了。环境是java环境，工具用的eclipse。

首先看电脑端的：

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class PC {
private static String phone_ip;

public static void main(String[] args) throws IOException {
String[] rece_info = receive().split(",");
phone_ip = rece_info[1];
send("电脑发来的信息");
}

/**
* 发送数据
*
* @param s_info
* @throws IOException
*/
private static void send(String s_info) throws IOException {
// 创建一个DatagramSocket对象，并指定监听的端口号
DatagramSocket s_socket = new DatagramSocket(3000);
// 将发送的数据转成byte
byte[] s_data = s_info.getBytes();
// 创建一个InetAddree（接受端ip）
InetAddress serverAddress = InetAddress.getByName("192.168.191.2");
// InetAddress serverAddress = InetAddress.getByName(phone_ip);
// 创建一个DatagramPacket对象用来存放数据、目标IP、目标端口号
DatagramPacket s_dp = new DatagramPacket(s_data, 0, s_data.length,
serverAddress, 5000);
// 发送数据
s_socket.send(s_dp);
// 关闭DatagramSocket
s_socket.close();
}

/**
* 接受数据
*
* @throws IOException
*/
private static String receive() throws IOException {
// 创建byte数组存放数据
byte[] r_data = new byte[1024];
// 创建一个DatagramPacket对象用来存接受到的数据
DatagramPacket r_dp = new DatagramPacket(r_data, r_data.length);
// 创建一个DatagramSocket对象，并指定监听的端口号
DatagramSocket r_socket = new DatagramSocket(5000);
// 接受数据
r_socket.receive(r_dp);
// 获取DatagramSocket中的数据
String r_info = new String(r_dp.getData(), 0, r_dp.getLength());
// 关闭DatagramSocket
r_socket.close();
System.out.println(r_info);
return r_info;
}
}

下面在看Android端的，因为两边方法基本一样，所以下面就没写注释。

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

import android.support.v7.app.ActionBarActivity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;

public class MainActivity extends ActionBarActivity {

/**
* 添加权限：<uses-permission android:name="android.permission.INTERNET"/>
* <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
* <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
* <uses-permission android:name="android.permission.WAKE_LOCK" />
* 由于Android中主线程不允许执行联网操作，所以用线程来执行.
*
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

new Thread(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
try {
send("手机ip，" + getIP());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}).start();

new Thread(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
try {
receive();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}).start();

}

/**
* wifi状态下获取手机的IP地址
*
* @return
*/
private String getIP() {
// 获取wifi服务
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
// 判断wifi是否开启
if (!wifiManager.isWifiEnabled()) {
wifiManager.setWifiEnabled(true);
}
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddress = wifiInfo.getIpAddress();
String ip = (ipAddress & 0xFF) + "." + ((ipAddress >> 8) & 0xFF) + "."
+ ((ipAddress >> 16) & 0xFF) + "." + (ipAddress >> 24 & 0xFF);
return ip;
}

/**
* 发送数据
*
* @param s_info
* @throws IOException
*/
private static void send(String s_info) throws IOException {
DatagramSocket s_socket = new DatagramSocket(3000);
byte[] s_data = s_info.getBytes();
InetAddress serverAddress = InetAddress.getByName("192.168.191.1");
DatagramPacket s_dp = new DatagramPacket(s_data, 0, s_data.length,
serverAddress, 5000);
s_socket.send(s_dp);
}

/**
* 接受数据
*
* @throws IOException
*/
private static void receive() throws IOException {
byte[] r_data = new byte[1024];
DatagramPacket r_dp = new DatagramPacket(r_data, r_data.length);
DatagramSocket r_socket = new DatagramSocket(5000);
r_socket.receive(r_dp);
String r_info = new String(r_dp.getData(), 0, r_dp.getLength());
r_socket.close();
System.out.println(r_info);
}
}

布局文件就一个Textview，就不贴代码了。

一个简单的示例就完成了。

源码下载：http://download.csdn.net/detail/luckkissmo/9243089