java里面怎样找到局域网内所有机器的ip地址！

Question

String host=null;
int a,b,c,d;
a=192;
b=168;
c=0;
for (d=0;d<=255;d++)
{
  host=a+"."+b+"."+c+"."+d;
  java.net.InetAddress hostAddress=java.net.InetAddress.getByName(host);
  String hostName=hostAddress.getHostName();
  System.out.println(hostName);
}可以的，没有主机名的就是局域网的。。但是比较慢。。没有办法了

Answer 1

yuebenxian(飘逸) 提供的是思路啊，然后从本机ip地址得到a,b,c，然后循环应该可以。别发牢骚了。

Answer 2

加上多线程后速度还是非常快的。例如：int a;
        int b;
        int c;
        int d;        a = 192;
        b = 168;
        for(c = 1; c <= 1; c++) {
            for(d = 0; d <= 255; d++) {
                final String host = a + "." + b + "." + c + "." + d;                    new Thread() {
                        public void run() {
                            InetAddress hostAddress = null;                            try {
                                hostAddress = java.net.InetAddress.getByName(host);
                                if(!hostAddress.getHostName().equalsIgnoreCase(hostAddress.getHostAddress()))
                             System.out.println(hostAddress.getHostName());
                            }
                            catch(UnknownHostException ex) {
                            }
                        }
                    }.start();
            }
        }