Java如何基于ProcessBuilder类调用外部程序

比眉伴天荒 2023-09-30 13:48 20阅读 0赞

## Java如何基于ProcessBuilder类调用外部程序 ##

1.  demo1

@Test
      public void testProcessBuilder() {
        
        ProcessBuilder processBuilder = new ProcessBuilder();
    //    processBuilder.command("ping","127.0.0.1");
        processBuilder.command("ipconfig");
        //将标准输入流和错误输入流合并，通过标准输入流读取信息
        processBuilder.redirectErrorStream(true);
        try {
        
          //启动进程
          Process start = processBuilder.start();
          //获取输入流
          InputStream inputStream = start.getInputStream();
          //转成字符输入流
          InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "gbk");
          int len = -1;
          char[] c = new char[1024];
          StringBuffer outputString = new StringBuffer();
          //读取进程输入流中的内容
          while ((len = inputStreamReader.read(c)) != -1) {
        
            String s = new String(c, 0, len);
            outputString.append(s);
            System.out.print(s);
          }
          inputStream.close();
        } catch (IOException e) {
        
          e.printStackTrace();
        }
      }

![img][]

1.  demo02

@Test
      public void testFFmpeg() {
        
        ProcessBuilder processBuilder = new ProcessBuilder();
        //定义命令内容
        List<String> command = new ArrayList<>();
        command.add("D:/program/ffmpeg-20191229-e20c6d9-win64-static/bin/ffmpeg.exe");
        command.add("-i");
        command.add("D:/test/video/1.avi");
        command.add("-y");//覆盖输出文件
        command.add("-c:v");
        command.add("libx264");
        command.add("-s");
        command.add("1280x720");
        command.add("-pix_fmt");
        command.add("yuv420p");
        command.add("-b:a");
        command.add("63k");
        command.add("-b:v");
        command.add("753k");
        command.add("-r");
        command.add("18");
        command.add("D:/test/video/1.mp4");
        processBuilder.command(command);
        //将标准输入流和错误输入流合并，通过标准输入流读取信息
        processBuilder.redirectErrorStream(true);
        try {
        
          //启动进程
          Process start = processBuilder.start();
          //获取输入流
          InputStream inputStream = start.getInputStream();
          //转成字符输入流
          InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "gbk");
          int len = -1;
          char[] c = new char[1024];
          StringBuffer outputString = new StringBuffer();
          //读取进程输入流中的内容
          while ((len = inputStreamReader.read(c)) != -1) {
        
            String s = new String(c, 0, len);
            outputString.append(s);
            System.out.print(s);
          }
          inputStream.close();
        } catch (IOException e) {
        
          e.printStackTrace();
        }
      }

![img][img 1]

![img][img 2]

[img]: https://img-blog.csdnimg.cn/img_convert/ab4915ec3dd3c1955132b650a454c1f8.png
[img 1]: https://img-blog.csdnimg.cn/img_convert/54bb9b7a74dcab7eb4ec20dc1895f0af.png
[img 2]: https://img-blog.csdnimg.cn/img_convert/cb6ccc0e8d895c8e5d2955ac3aeefd70.png