Call ping test Network in Java

public static final string[] encodes = new string[] {"UTF-8", "GBK", "GB2312", "iso-8859-1", "iso-8859-2"};
public static void Main (string[] args) throws Exception {
TODO auto-generated Method Stub
Boolean flag = Ping ("172.0.0.1");
SYSTEM.OUT.PRINTLN (flag);
PING02 ("172.28.20.92");
}
The first method: Jdk1.5 's inetaddresss, the code is simple.
public static Boolean ping (String ipaddress) throws Exception {
int timeOut = 3000; Timeout should be over 3 banknotes
Boolean status = Inetaddress.getbyname (IPAddress). isreachable (TimeOut); When the return value is true, the host is available and false is not.
return status;
}
The second approach: Use Java to invoke the cmd command, which is the simplest way to display the ping process locally.
public static void Ping02 (String ipaddress) throws Exception {
String line = null;
try {
Process Pro = Runtime.getruntime (). EXEC ("ping" + ipaddress);
BufferedReader buf = new BufferedReader (New InputStreamReader (
Pro.getinputstream (), "GBK"));
while (line = Buf.readline ())!= null) {
line = new String (line.getbytes ("iso-8859-1"), "UTF-8");
line = new String (line.getbytes ("UTF-8"), "GBK");
line = new String (line.getbytes ("iso-8859-1"), "Utf-8");
line = new String (line.getbytes ("iso-8859-1"), "GBK");
line = new String (line.getbytes ("gb2312"), "GBK");
line = new String (line.getbytes ("gb2312"), "UTF-8");
System.out.println (transcoding (line, "GBK"));
System.out.println (line);

}


catch (Exception ex) {
System.out.println (Ex.getmessage ());
}
}

The third way: It is also using the Java Invoke Console ping command, which is more reliable, but also universal, easy to use: Incoming IP, set the number of ping and timeout, can be based on the return value to determine whether Ping pass.


public static Boolean ping (String ipaddress, int pingtimes, int timeOut) {
BufferedReader in = null;
Runtime r = Runtime.getruntime (); The ping command that will be executed, which is a command in Windows format
String Pingcommand = "Ping" + ipaddress + "-n" + Pingtimes + "-w" + TimeOut;
try {//execute command and get output
System.out.println (Pingcommand);
Process p = r.exec (Pingcommand);
if (p = = null) {
return false;
}
in = new BufferedReader (New InputStreamReader (P.getinputstream ())); Check output line by row to calculate the number of occurrences of =23ms ttl=62 typeface
int connectedcount = 0;
String line = null;
while (line = In.readline ())!= null) {
Connectedcount + + getcheckresult (line);
//If a word similar to =23ms ttl=62 appears, the number of occurrences = number of tests returns True
return connectedcount = = Pingtimes;
catch (Exception ex) {
Ex.printstacktrace (); Returns False if an exception occurs
return false;
finally {
try {
In.close ();
catch (Exception e) {
E.printstacktrace ();
}
}
}
private static int Getcheckresult (String line) {//System.out.println ("The result of the console output is:" +line);
Pattern pattern = Pattern.compile ("(\\d+ms) (\\s+) (ttl=\\d+)", pattern.case_insensitive);
Matcher Matcher = Pattern.matcher (line);
while (Matcher.find ()) {
return 1;
}
return 0;
}