ProcessBuilder不会输出任何内容

时间:2015-04-05 21:21:45

标签: java processbuilder

我使用Process Builder运行shell命令:

try {
    ProcessBuilder lmBuilder = new ProcessBuilder("/home/istanbul/srilm/bin/i686-m64/ngram-count", "-text", modelPath, "-order", "3", "-lm", modelOutputPath);
    lmBuilder.redirectErrorStream();
    final Process lmProcess = lmBuilder.start();
    int result = lmProcess.waitFor(); //result becomes 0
    InputStream is = lmProcess.getInputStream();
    InputStreamReader isr = new InputStreamReader(is);
    BufferedReader br = new BufferedReader(isr);

    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }

} catch (IOException | InterruptedException e) {
    e.printStackTrace();
}

当我检查命令的输出时,我看到它正常工作。当我通过shell运行它时,我看到了输出:

warning: discount coeff 1 is out of range: 0
warning: discount coeff 7 is out of range: 1.06876
warning: discount coeff 7 is out of range: 2.09945

但是,当我通过流程构建器运行时,我看不到任何输出

有什么想法吗?

1 个答案:

答案 0 :(得分:2)

lmBuilder.redirectErrorStream();

这是不正确的。

此方法仅告诉是否将stderr重定向到stdout;它没有指示应该将stderr重定向到它。

你应该使用的是:

lmBuilder.redirectErrorStream(true);