Java执行wmic命令获取系统环境变量

转：http://blog.csdn.net/weiyangcau/article/details/7617839

1.首先编写文件setenv.bat设置系统环境变量：

echo %cd%
set framework_home=%cd%
echo %framework_home%
wmic ENVIRONMENT create name="framework_home",username="<system>",VariableValue="%framework_home%"

Note:

此处假设framework_home为要添加的系统环境变量，且其值为当前路径。Windows系统有两种环境变量：用户变量和系统变量。上面设置的是系统变量。

2.编写Java程序读取上面设置的系统环境变量：

package test.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

class StreamDrainerThread implements Runnable
{
	private InputStream ins;

	public static String environmentValue;

	public StreamDrainerThread(InputStream ins)
	{
		this.ins = ins;
	}

	public void run()
	{
		try
		{
			BufferedReader reader = new BufferedReader(new InputStreamReader(ins));
			String line = null;
			while ((line = reader.readLine()) != null)
			{
				if (!line.trim().equals(""))
				{
					environmentValue = line;
				}
			}
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

}

public class WMICJava
{
	public static void main(String[] args) throws IOException
	{
		String[] cmd = new String[]
		{ "cmd.exe", "/C", "wmic ENVIRONMENT where \"name=\'framework_home\'\" get VariableValue" };
		try
		{
			Process process = Runtime.getRuntime().exec(cmd);
			StreamDrainerThread streamDrainer = new StreamDrainerThread(process.getInputStream());
			new Thread(streamDrainer).start();
			process.getOutputStream().close();
			process.waitFor();
			System.out.println("Environment Parameter OATS_HOME is " + StreamDrainerThread.environmentValue);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}
}