Java使用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();
        }
    }

2. 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();
        }
    }