#yyds干货盘点#Process 和 ProcessBuilder

Posted 2022-02-12 峰啊疯了

1、使⽤Runtime

Process process = null;
BufferedReader bufferedReader = null;
String[] command = "/bin/sh", "-c", "cd /home/test & ./test.sh";
try 
   process = Runtime.getRuntime().exec(command);
   bufferedReader = new BufferedReader(new
   InputStreamReader(process.getInputStream()));
   String line;
   while (null != (line = bufferedReader.readLine())) 
      System.out.println(line);
 
 process.waitFor();
catch (IOException e) 
   e.printStackTrace();
catch (InterruptedException e) 
   e.printStackTrace();
finally 
 if (null != bufferedReader) 
      try 
            bufferedReader.close();
          catch (IOException e) 
         e.printStackTrace();
      
 
      if (null != process)
       process.destroy();

Process可以获取到三种流：标准输⼊、标准输出、标准错误输⼊(getOutputStream()，getInputStream()，

getErrorStream())，重定向到⽗进程。

注意：可能会出现标准输⼊和标准错误输⼊都有数据，如果对数据的顺序有要求，最简单的做法就是使⽤ProcessBuilder

合并两个流。

2、使⽤ProcessBuilder

相⽐Process有更多的功能，⽐如可以设置当前⼯作⽬录，还可以改变环境参数

Process process = null;
BufferedReader bufferedReader = null;
String[] command = "/bin/sh", "-c", "cd /home/test & ./test.sh";
try 
 ProcessBuilder builder = new ProcessBuilder(command);
 //合并输⼊流
 builder.redirectErrorStream(true);
 process = builder.start();
 bufferedReader = new BufferedReader(new
InputStreamReader(process.getInputStream()));
 String line;
 while (null != (line = bufferedReader.readLine()))  System.out.println(line);
 
 process.waitFor();
 int result = process.exitValue(); //为0表⽰执⾏成功，⾮0表⽰shell执
⾏出错
 System.out.println(result);
 catch (IOException e) 
 e.printStackTrace();
 catch (InterruptedException e) 
 e.printStackTrace();
 finally 
 if (null != bufferedReader) 
 try 
 bufferedReader.close();
  catch (IOException e) 
 e.printStackTrace();
 
 
 if (null != process)
 process.destroy();

使⽤redirectErrorStream为true，合并成⼀个流。