java.lang.Process 阻塞问题

Process 类型对象的 waitFor() 方法的时候当前线程会被阻塞掉，因为InputStream in = Process.getInputStream();或 InputStream err = Process.getErrorStream(); 这2个流中的一个会被阻塞住，所以解决的办法可以是用多线程来解决，可以参看http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps_p.html 。

但还有另一种方法可以尝试，

            String[] cmds = {...};//command and arg
            ProcessBuilder builder = new ProcessBuilder(cmds);
            //both read inputstream and errstream
            builder.redirectErrorStream(true);
            Process process = builder.start();
            BufferedReader br = new BufferedReader(new InputStreamReader(process
                .getInputStream()));
            String readLine = br.readLine();
            while (readLine != null) {
               System.out.println(readLine);
               readLine = br.readLine();
            }
            int resultValue = process.waitFor();

builder.redirectErrorStream(true); 和BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream())); 这样使用就可以在一个线程中执行，而保证不被阻塞住。