将进程输出重定向到stdout

它使用一个类读取执行的程序生成的所有输出，并将其显示在其自己的stdout中。

class StreamGobbler extends Thread {    InputStream is;    // reads everything from is until empty.     StreamGobbler(InputStream is) {        this.is = is;    }    public void run() {        try { InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line=null; while ( (line = br.readLine()) != null)     System.out.println(line); } catch (IOException ioe) { ioe.printStackTrace();          }    }}Runtime rt = Runtime.getRuntime();Process proc = rt.exec("javac");//output both stdout and stderr data from proc to stdout of this processStreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream());StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream());errorGobbler.start();outputGobbler.start();proc.waitFor();