Android获取局域网所有设备的ip地址

android 手机局域网扫描PC机； 利用android的ping命令扫描局域网内所有ip， 并对其进行socket通信 import java.io.DataInputStream; import java.io.IOException; import java.io.PrintWriter; import java.net.InetAddress; import java.net.NetworkInterface; import java.net.Socket; import java.net.SocketException; import java.util.Enumeration; import org.apache.http.conn.util.InetAddressUtils; import android.annotation.SuppressLint; import android.content.Context; import android.content.SharedPreferences; import android.os.Handler; import android.os.Message; import android.util.Log; import android.widget.Toast; public class NetTool { private int SERVERPORT = 8888 ; private String locAddress; //存储本机ip，例：本地ip ：192.168.1. private Runtime run = Runtime.getRuntime(); //获取当前运行环境，来执行ping，相当于windows的cmd private Process proc = null ; private String ping = "ping -c 1 -w 0.5 " ; //其中 -c 1为发送的次数，-w 表示发送后等待响应的时间 private int j; //存放ip最后一位地址 0-255 private Context ctx; //上下文 public NetTool(Context ctx){ this .ctx = ctx; } private Handler handler = new Handler(){ public void dispatchMessage(Message msg) { switch (msg.what) { case 222 : // 服务器消息 break ; case 333 : // 扫描完毕消息 Toast.makeText(ctx, "扫描到主机：" +((String)msg.obj).substring( 6 ), Toast.LENGTH_LONG).show(); break ; case 444 : //扫描失败 Toast.makeText(ctx, (String)msg.obj, Toast.LENGTH_LONG).show(); break ; } } }; //向serversocket发送消息 public String sendMsg(String ip,String msg) { String res = null ; Socket socket = null ; try { socket = new Socket(ip, SERVERPORT); //向服务器发送消息 PrintWriter os = new PrintWriter(socket.getOutputStream()); os.println(msg); os.flush(); // 刷新输出流，使Server马上收到该字符串 //从服务器获取返回消息 DataInputStream input = new DataInputStream(socket.getInputStream()); res = input.readUTF(); System.out.println( "server 返回信息：" + res); Message.obtain(handler, 222 , res).sendToTarget(); //发送服务器返回消息 } catch (Exception unknownHost) { System.out.println( "You are trying to connect to an unknown host!" ); } finally { // 4: Closing connection try { if (socket != null ) { socket.close(); } } catch (IOException ioException) { ioException.printStackTrace(); } } return res; } /** * 扫描局域网内ip，找到对应服务器 */ public void scan(){ locAddress = getLocAddrIndex(); //获取本地ip前缀 if (locAddress.equals( "" )){ Toast.makeText(ctx, "扫描失败，请检查wifi网络" , Toast.LENGTH_LONG).show(); return ; } for ( int i = 0 ; i < 256 ; i++) { //创建256个线程分别去ping j = i ; new Thread( new Runnable() { public void run() { String p = NetTool. this .ping + locAddress + NetTool. this .j ; String current_ip = locAddress+ NetTool. this .j; try { proc = run.exec(p); int result = proc.waitFor(); if (result == 0 ) { System.out.println( "连接成功" + current_ip); // 向服务器发送验证信息 String msg = sendMsg(current_ip, "scan" +getLocAddress()+ " ( " +android.os.Build.MODEL+ " ) " ); //如果验证通过... if (msg != null ){ if (msg.contains( "OK" )){ System.out.println( "服务器IP：" + msg.substring( 8 ,msg.length())); Message.obtain(handler, 333 , msg.substring( 2 ,msg.length())).sendToTarget(); //返回扫描完毕消息 } } } else { } } catch (IOException e1) { e1.printStackTrace(); } catch (InterruptedException e2) { e2.printStackTrace(); } finally { proc.destroy(); } } }).start(); } } //获取本地ip地址 public String getLocAddress(){ String ipaddress = "" ; try { Enumeration en = NetworkInterface.getNetworkInterfaces(); // 遍历所用的网络接口 while (en.hasMoreElements()) { NetworkInterface networks = en.nextElement(); // 得到每一个网络接口绑定的所有ip Enumeration address = networks.getInetAddresses(); // 遍历每一个接口绑定的所有ip while (address.hasMoreElements()) { InetAddress ip = address.nextElement(); if (!ip.isLoopbackAddress() && InetAddressUtils.isIPv4Address(ip.getHostAddress())) { ipaddress = ip.getHostAddress(); } } } } catch (SocketException e) { Log.e( "" , "获取本地ip地址失败" ); e.printStackTrace(); } System.out.println( "本机IP:" + ipaddress); return ipaddress; } //获取IP前缀 public String getLocAddrIndex(){ String str = getLocAddress(); if (!str.equals( "" )){ return str.substring( 0 ,str.lastIndexOf( "." )+ 1 ); } return null ; } //获取本机设备名称 public String getLocDeviceName() { return android.os.Build.MODEL; } }

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