Java实现操作dos命令

package com;
import java.io.BufferedReader;  
import java.io.InputStreamReader;   
public class qumf {    
    public static void main(String[] args) {  
      try {  
              Runtime rt = Runtime.getRuntime();  
              Process pr = rt.exec("cmd /c ping www.baidu.com && dir");
              //Process pr = rt.exec("D:\\xunlei\\project.aspx");    
              BufferedReader input = new BufferedReader(new InputStreamReader(pr.getInputStream(), "GBK"));  
              String line = null;  
              while ((line = input.readLine()) != null) {  
                  System.out.println(line);  
              }  
              int exitVal = pr.waitFor();  
              System.out.println("Exited with error code " + exitVal);  
  
           } catch (Exception e) {  
             System.out.println(e.toString());  
             e.printStackTrace();  
        }  
    }  
}