JAVA多线程执行cmd命令

package com.dtt.scm;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.util.LinkedList;public class Command extends Thread{ private java.lang.Process p;  private InputStream is; private OutputStream os; private BufferedWriter bw; private BufferedReader br; private ProcessBuilder pb; private InputStream stdErr; public Command() { } //获取Process的输入，输出流 public void setCmd(String cmd) {  try {   p = Runtime.getRuntime().exec(cmd);   os = p.getOutputStream();   is = p.getInputStream();   stdErr = p.getErrorStream();  } catch (IOException e) {   System.err.println(e.getMessage());  } } //向Process输出命令 public void writeCmd(String cmd) {  try {   bw = new BufferedWriter(new OutputStreamWriter(os));   bw.write(cmd);   bw.newLine();   bw.flush();   bw.close();  } catch (Exception e) {   e.printStackTrace();  } } //读出Process执行的结果 public String readCmd() {  StringBuffer sb = new StringBuffer();  br = new BufferedReader(new InputStreamReader(is));  String buffer = null;  try {   while ((buffer = br.readLine()) != null) {    sb.append(buffer + "\n");   }   System.out.println(p.waitFor());  } catch (Exception e) {   e.printStackTrace();  }  return sb.toString(); } //将命令一股脑塞入list中 public LinkedList<String> doCmd(LinkedList<String> lists) {  LinkedList<String> list = new LinkedList<String>();  for (String s : lists) {   writeCmd(s);   list.add(readCmd());  }  return list; } public void run(){    Command cmd = new Command();    cmd.setCmd("cmd");    cmd.writeCmd("start cmd /k ping -a -t 43.248.133.79 -l 1000");    System.out.println(cmd.readCmd());    //LinkedList<String> list = new LinkedList<String>();    //list.add("dir/b");    //list = cmd.doCmd(list);    //for(String s:list){    //System.out.print(s); }    public static void main(String[] args) {        Thread thr1 = new Command();        Thread thr2 = new Command();        thr1.start();        thr2.start();    }}