java 读取系统环境变量和值

package system.properties;

import java.util.Enumeration;
import java.util.Properties;

/**
*
*/
public class Info {

/**
* create time：2009-5-21 下午04:34:50
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Properties p = System.getProperties();
Enumeration<?> pn = p.propertyNames();


//Enumeration en = p.elements();
while(pn.hasMoreElements()){
Object o = pn.nextElement();
System.out.println(o.toString()+"="+p.get(o.toString()));
}
}

}