这篇文章主要介绍了Java如何基于ProcessBuilder类调用外部程序,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

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(); } }

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