输入流的种类[需要思考和补充]

今天写了一段程序来实现在控制台捕捉Java –version信息，没有成功，

后来改写了pr.getErrorStream()才凑效，原因是，这个showVersion不是standard输入输出，而pr.getInputStream捕捉标准的输入输出

Process pr = null;

       String[] cmd = {"D://JDK//bin//java.exe", "-showversion"};

//     String[] cmd = {"ping", "127.0.0.1"};

//     pr = Runtime.getRuntime().exec(cmd);

       pr = Runtime.getRuntime().exec("D://JDK//bin//java.exe -version");

       pr.waitFor();

//     BufferedReader br = new BufferedReader(new InputStreamReader(pr.getInputStream()));

       BufferedReader br = new BufferedReader(new InputStreamReader(pr.getErrorStream()));

       String line;

       while( (line = br.readLine()) != null)

       {

           System.out.println(line);

       }

 

总结：