多次编写OutputStream Pipleline错误-Java

Question

I try to communicate with the process by using this way:

Process process = Runtime.getRuntime().exec("/home/username/Desktop/mosesdecoder/bin/moses -f /home/username/Desktop/mosesdecoder/model/moses.ini");

while (true) {
    OutputStream stdin = null;
    InputStream stderr = null;
    InputStream stdout = null;
    stdin = process.getOutputStream();
    stderr = process.getErrorStream();
    stdout = process.getInputStream();

    // "write" the parms into stdin
    line = "i love you" + "\n";
    stdin.write(line.getBytes());
    stdin.flush();
    stdin.close();
    // Print out the output
    BufferedReader brCleanUp =
            new BufferedReader(new InputStreamReader(stdout));
    while ((line = brCleanUp.readLine()) != null) {
        System.out.println("[Stdout] " + line);
    }
    brCleanUp.close();
}

This works fine. However, I am stuck with a problem when I write the pipeline more than one time. That is - I can write to the Outputstream pipeline more than one time. The error is (for the 2th iteration):

Exception in thread "main" java.io.IOException: **Stream Closed**
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:297)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.**flush(BufferedOutputStream.java**:140)
at moses.MOSES.main(MOSES.java:60)

So, is there any way to fix this problem?

Answer 1

In your while {} loop, you are calling stdin.close(). The first time through the loop, the stream is retrieved from the Process and happens to be open. On the first iteration of the loop, the stream is retrieved from the process, written to, flushed, and closed(!). Subsequent iterations of the loop then get the same stream from the process, but it was closed on the first iteration of the loop (!), and your program throws an IOException .