Android手機局域網掃描PC機，利用android的ping命令掃描局域網內所有ip，並對其進行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;//存儲本機ip，例：本地ip ：192.168.1.
private Runtime run = Runtime.getRuntime();//獲取當前運行環境，來執行ping，相當於windows的cmd
private Process proc = null;
private String ping = "ping -c 1 -w 0.5 " ;//其中 -c 1爲發送的次數，-w 表示發送後等待響應的時間
private int j;//存放ip最後一位地址 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:// 服務器消息
break;
case 333:// 掃描完畢消息
Toast.makeText(ctx, "掃描到主機："+((String)msg.obj).substring(6), Toast.LENGTH_LONG).show();
break;
case 444://掃描失敗
Toast.makeText(ctx, (String)msg.obj, Toast.LENGTH_LONG).show();
break;
}
}
};
//向serversocket發送消息
public String sendMsg(String ip,String msg) {
String res = null;
Socket socket = null;
try {
socket = new Socket(ip, SERVERPORT);
//向服務器發送消息
PrintWriter os = new PrintWriter(socket.getOutputStream());
os.println(msg);
os.flush();// 刷新輸出流，使Server馬上收到該字符串
//從服務器獲取返回消息
DataInputStream input = new DataInputStream(socket.getInputStream());
res = input.readUTF();
System.out.println("server 返回信息：" + res);
Message.obtain(handler, 222, res).sendToTarget();//發送服務器返回消息
} 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;
}
/**
* 掃描局域網內ip，找到對應服務器
*/
public void scan(){
locAddress = getLocAddrIndex();//獲取本地ip前綴
if(locAddress.equals("")){
Toast.makeText(ctx, "掃描失敗，請檢查wifi網絡", Toast.LENGTH_LONG).show();
return ;
}
for ( int i = 0; i < 256; i++) {//創建256個線程分別去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("連接成功" + current_ip);
// 向服務器發送驗證信息
String msg = sendMsg(current_ip,"scan"+getLocAddress()+" ( "+android.os.Build.MODEL+" ) ");
//如果驗證通過...
if (msg != null){
if (msg.contains("OK")){
System.out.println("服務器IP：" + msg.substring(8,msg.length()));
Message.obtain(handler, 333, msg.substring(2,msg.length())).sendToTarget();//返回掃描完畢消息
}
}
} else {
}
} catch (IOException e1) {
e1.printStackTrace();
} catch (InterruptedException e2) {
e2.printStackTrace();
} finally {
proc.destroy();
}
}
}).start();
}
}
//獲取本地ip地址
public String getLocAddress(){
String ipaddress = "";
try {
Enumeration<networkinterface> en = NetworkInterface.getNetworkInterfaces();
// 遍歷所用的網絡接口
while (en.hasMoreElements()) {
NetworkInterface networks = en.nextElement();
// 得到每一個網絡接口綁定的所有ip
Enumeration<inetaddress> address = networks.getInetAddresses();
// 遍歷每一個接口綁定的所有ip
while (address.hasMoreElements()) {
InetAddress ip = address.nextElement();
if (!ip.isLoopbackAddress()
&& InetAddressUtils.isIPv4Address(ip.getHostAddress())) {
ipaddress = ip.getHostAddress();
}
}
}
} catch (SocketException e) {
Log.e("", "獲取本地ip地址失敗");
e.printStackTrace();
}
System.out.println("本機IP:" + ipaddress);
return ipaddress;
}
//獲取IP前綴
public String getLocAddrIndex(){
String str = getLocAddress();
if(!str.equals("")){
return str.substring(0,str.lastIndexOf(".")+1);
}
return null;
}
//獲取本機設備名稱
public String getLocDeviceName() {
return android.os.Build.MODEL;
}
}
</inetaddress>
</networkinterface>
