Android:手机扫描局域网所有ip，并进行socket通讯

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通信另外：服务端应该写serversocket来接收扫描，服务端的代码我没贴上来，不过也很简单；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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