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。

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<String> getPhysicalAddress()
    {
        Process p = null;
        //物理网卡列表
        List<String> address = new ArrayList<String>();

        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());
       &nb

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