Java write broadband connection. ADSL dialing, and detect disconnection automatically reconnect, replace IP

Package Com.hua;
Import Java.io.BufferedReader;
Import java.io.IOException;
Import Java.io.InputStream;
Import Java.io.InputStreamReader;

Import Java.util.Scanner; public class Connectnetwork {/** * executes the cmd command and returns a string string */public static string Executecmd (String strcmd) throws Ex
		ception {Process p = runtime.getruntime (). EXEC ("cmd/c" + strcmd);
		StringBuilder sbcmd = new StringBuilder ();
		BufferedReader br = new BufferedReader (New InputStreamReader (P.getinputstream (), "GB2312"));
		String Line;
		while (line = Br.readline ())!= null) {sbcmd.append (line + \ n));

	return sbcmd.tostring (); /** * Connect ADSL/public static Boolean CONNADSL (String adsltitle, String adslname, String adslpass) throws Excepti
		On {System.out.println ("connection is being established.");
		String adslcmd = "rasdial" + Adsltitle + "" + Adslname + "" + adslpass;
		String tempcmd = Executecmd (adslcmd);
			Determines whether the connection succeeds if (Tempcmd.indexof (connected) > 0) {System.out.println ("The connection was successfully established."); return true;
		else {System.err.println (tempcmd);
			SYSTEM.ERR.PRINTLN ("Establish connection failed");
		return false;  }/** * Disconnect ADSL/public static Boolean CUTADSL (String adsltitle) throws Exception {string cutadsl = "rasdial
		"+ Adsltitle +"/disconnect ";

		String result = Executecmd (CUTADSL);
			if (Result.indexof ("no Connection")!=-1) {System.err.println (adsltitle + "Connection does not exist!");
		return false;
			else {System.out.println ("disconnected");
		return true;
	        }/** * Test network connectivity/public static Boolean Isconnect () {Boolean connect = false;
	        Runtime Runtime = Runtime.getruntime ();
	        Process process;
	            try {process = Runtime.exec ("ping" + "www.baidu.com"); 
	            InputStream is = Process.getinputstream (); 
	            InputStreamReader ISR = new InputStreamReader (IS); 
	            BufferedReader br = new BufferedReader (ISR); 
	            String line = null; 
	            StringBuffer sb = new StringBuffer (); while (LinE = Br.readline ())!= null) {sb.append (line);  
	            } System.out.println ("Return value is:" +SB); 
	            Is.close (); 
	            Isr.close (); 
	 
	            Br.close (); 
	                if (null!= SB &&!sb.tostring (). Equals ("")) {String logstring = "";
	                if (sb.tostring (). IndexOf ("TTL") > 0) {//network unblocked connect = true;
	                else {//network not unblocked connect = false;
	        A catch (IOException e) {e.printstacktrace ());
	    return connect; }//test code public static void Main (string[] args) throws Interruptedexception, Exception {Scanner sc = new Scanner (S
	  ystem.in); SYSTEM.OUT.PRINTLN ("Broadband Connection Name:");
	  Look at you. The name of the broadband connection String name = Sc.next (); 
	  System.out.println ("Broadband Account:");
	  String username = Sc.next (); 
	SYSTEM.OUT.PRINTLN ("Broadband Password:");  String password = sc.next ();
		  String adsl= "broadband connection";
	          while (True) {Boolean connect = Isconnect ();
	              Thread.Sleep (100000);//in milliseconds, I set the 100 seconds. Look at yourself. Change if (!connect) {System.out.println ("No network, dialing on");
	          CONNADSL (Name,username,password); }
		  }
	  
	}
}

/**
* Automatic replacement of IP
* *  */

public void Changeip () throws exception{
    Scanner sc = new Scanner (system.in);
    SYSTEM.OUT.PRINTLN ("Broadband Connection Name:"); Look at you. The name of the broadband connection
    String name = Sc.next ();
    System.out.println ("Broadband Account:");
    String username = Sc.next ();
    SYSTEM.OUT.PRINTLN ("Broadband Password:");
    String password = sc.next ();
    SYSTEM.OUT.PRINTLN ("Replacement time (1 seconds in milliseconds equals 1000 milliseconds):");
    int wait = Sc.nextint ();
    while (true) {
      CONNADSL (name, username, password);
      Thread.Sleep (wait);
      CUTADSL (name);
      Thread.Sleep (wait);
      Again, assign a new IP
      CONNADSL (name, username, password);
    }