Java执行cmd命令两种实现方法解析

//一般的执行方法，有时执行exe会卡在那  stmt要执行的命令
  public static void executive(String stmt) throws IOException, InterruptedException {
    Runtime runtime = Runtime.getRuntime(); //获取Runtime实例
    //执行命令
    try {
      String[] command = {"cmd", "/c", stmt};
      Process process = runtime.exec(command);
      // 标准输入流（必须写在 waitFor 之前）
      String inStr = consumeInputStream(process.getInputStream());
      // 标准错误流（必须写在 waitFor 之前）
      String errStr = consumeInputStream(process.getErrorStream());
      new ProcessClearStream(process.getInputStream(), "INFO").start();
      new ProcessClearStream(process.getErrorStream(), "ERROR").start();
      int proc = process.waitFor();
      InputStream errorStream = process.getErrorStream(); //若有错误信息则输出
      if (proc == 0) {
        System.out.println("执行成功");
      } else {
        System.out.println("执行失败" + errStr);
      }
    } catch (IOException | InterruptedException e) {
      e.printStackTrace();
    }
  }

　　/**
   * 消费inputstream，并返回
   */
  public static String consumeInputStream(InputStream is) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(is,"GBK"));
    String s;
    StringBuilder sb = new StringBuilder();
    while ((s = br.readLine()) != null) {
      System.out.println(s);
      sb.append(s);
    }
    return sb.toString();
  }

//这个方法比第一个好，执行时不会卡 stmt要执行的命令
  public static void aaa(String stam){
    BufferedReader br = null;
    try {
      File file = new File("D:\\daemonTmp");
      File tmpFile = new File("D:\\daemonTmp\\temp.tmp");//新建一个用来存储结果的缓存文件
      if (!file.exists()){
        file.mkdirs();
      }
      if(!tmpFile.exists()) {
        tmpFile.createNewFile();
      }
      ProcessBuilder pb = new ProcessBuilder().command("cmd.exe", "/c", stam).inheritIO();
      pb.redirectErrorStream(true);//这里是把控制台中的红字变成了黑字，用通常的方法其实获取不到，控制台的结果是pb.start()方法内部输出的。
      pb.redirectOutput(tmpFile);//把执行结果输出。
      pb.start().waitFor();//等待语句执行完成，否则可能会读不到结果。
      InputStream in = new FileInputStream(tmpFile);
      br= new BufferedReader(new InputStreamReader(in));
      String line = null;
      while((line = br.readLine()) != null) {
        System.out.println(line);
      }
      br.close();
      br = null;
      tmpFile.delete();//卸磨杀驴。
      System.out.println("执行完成");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      if(br != null) {
        try {
          br.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }