java网络编程(一)InetAddress和NetworkInterface

1:InetAddress是ip地址的高级表示。下面介绍其常用方法。

1.1:getByName():静态方法,接受要查找的主机名作为参数,如下:

InetAddress ia = InetAddress.getByName("localhost");
System.out.println(ia.getHostName());
System.out.println(ia.getHostAddress());


输出结果为:

   

localhost
127.0.0.1
1.2:getAllByName():给定一个主机名,返回一个数组,包含所有对应此主机名的地址,如下:
InetAddress[] ias = InetAddress.getAllByName("www.baidu.com");
for (int i = 0; i < ias.length; i++) {
	System.out.println(ias[i]);
}


输出结果为:

www.baidu.com/119.75.217.109
www.baidu.com/119.75.218.70


1.3:getHostName():返回一个包含主机名的字符串,如果没有主机名则返回ip;getHostAddress():返回ip;

InetAddress ia = InetAddress.getByName("192.168.0.107");
System.out.println(ia.getHostName());
System.out.println(ia.getHostAddress());


输出结果为:

chu
192.168.0.107


1.4:使用InetAddress查找局域网内所有的主机名和ip地址,如下:

private void search(){
        for(int num = 0; num <= 255; num++) {
            final String host = "192.168.0." + num;
                new Thread() {
                    public void run() {
                        try {
                        	InetAddress  hostAddress = InetAddress.getByName(host);
                            if(!hostAddress.getHostName().equalsIgnoreCase(hostAddress.getHostAddress()))
                        		System.out.println(hostAddress.getHostName()+":"+host);
                        }catch(UnknownHostException e) {
                        	e.printStackTrace();
                        }
                    }
                }.start();
        }
}


输出结果如下:

chu:192.168.0.107
CHINA-8903D0A7B:192.168.0.160
20100923-0243:192.168.0.101
KWH6ZHNESMCDDZC:192.168.0.104
PC-201011082204:192.168.0.114
深度系统:192.168.0.103
PC-20121013RPCE:192.168.0.164
ZKNRQ9CWBFAVQF8:192.168.0.111
DADI-PC:192.168.0.102
WAYSOFT:192.168.0.170
ADMIN_PC:192.168.0.211
KIN-PC:192.168.0.216
WIN-ELL8LDIF2H9:192.168.0.106


2:NetworkInterface表示物理硬件和虚拟地址。

2.1:使用NetworkInterface返回本地ip

Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces();
			while (netInterfaces.hasMoreElements()) {
				NetworkInterface nif = netInterfaces.nextElement();
				Enumeration<InetAddress> iparray = nif.getInetAddresses();
				while (iparray.hasMoreElements()) {
					InetAddress ip = iparray.nextElement();
					System.out.println(ip.getHostAddress());
				}
			}


输出结果为:

127.0.0.1
192.168.0.107


 

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