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();
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
