Java如何基于ProcessBuilder类调用外部程序

1. demo1

@Testpublic 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

 @Testpublic 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();}}