java获得IP地址

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java获得IP地址,第1张

下面有一篇文章，介绍若何读取物理网卡的地址 ，同样的

你可以用这个方法读取你所需要的本机IP地址

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J2SE5.0新特性之ProcessBuilder

这个例子使用了J2SE5.0的ProcessBuilder类执行外部的程序，相对于 Runtime.exec ,它更方便，可以设置环境变量等。这里使用它在windows下读取物理网卡的地址

package com.kuaff.jdk5package

import java.io.IOException

import java.io.InputStream

import java.util.ArrayList

import java.util.List

public class ProcessBuilderShow

{

public static List getPhysicalAddress()

{

Process p = null

//物理网卡列表

List address = new ArrayList()

try

{

//执行ipconfig /all命令

p = new ProcessBuilder("ipconfig", "/all").start()

}

catch (IOException e)

{

return address

}

byte[] b = new byte[1024]

StringBuffer sb = new StringBuffer()

//读取进程输出值

InputStream in = p.getInputStream()

try

{

while (in.read(b)>0)

{

sb.append(new String(b))

}

}

catch (IOException e1)

{

}

finally

{

try

{

in.close()

}

catch (IOException e2)

{

}

}

//以下分析输出值，得到物理网卡

String rtValue = sb.substring(0)

int i = rtValue.indexOf("Physical Address. . . . . . . . . :")

while(i>0)

{

rtValue = rtValue.substring(i + "Physical Address. . . . . . . . . :".length())

address.add(rtValue.substring(0,18))

i = rtValue.indexOf("Physical Address. . . . . . . . . :")

}

return address

}

public static void main(String[] args)

{

List address = ProcessBuilderShow.getPhysicalAddress()

for(String add:address)

{

System.out.printf("物理网卡地址:%s%n", add)

}

}

}

这个是获取不到的，因为有代理、端口映射等等转发情况的存在。为什么不保存相对路径/域名/或者在服务器上某个配置文件中配置域名/数据库中一个表/数据库中某个字段保存当前服务器的ip地址呢？

java获取外网ip地址方法：public class Main {public static void main(String[] args) throws SocketException {System.out.println(Main.getRealIp()) } public static String getRealIp() throws SocketException {String localip = null// 本地IP，如果没有配置外网IP则返回它String netip = null// 外网IP Enumeration<NetworkInterface>netInterfaces =NetworkInterface.getNetworkInterfaces() InetAddress ip = null boolean finded = false// 是否找到外网IPwhile (netInterfaces.hasMoreElements() &&!finded) {NetworkInterface ni = netInterfaces.nextElement() Enumeration<InetAddress>address = ni.getInetAddresses() while (address.hasMoreElements()) {ip = address.nextElement() if (!ip.isSiteLocalAddress()&&!ip.isLoopbackAddress()&&ip.getHostAddress().indexOf(":") == -1) {// 外网IPnetip = ip.getHostAddress() finded = true break } else if (ip.isSiteLocalAddress()&&!ip.isLoopbackAddress()&&ip.getHostAddress().indexOf(":") == -1) {// 内网IPlocalip = ip.getHostAddress() }}} if (netip != null &&!"".equals(netip)) {return netip } else {return localip }}}