java:解析执行命令的输出

Question

我在 Windows 7 上运行 jdk。我尝试在我的 java 应用程序中运行外部软件 (pocketsphinx_continous.exe)。该软件永久运行(pocketsphinx_continous.exe)并将一些输出打印到控制台，我喜欢通过我的java应用程序读取这些输出。

如果我使用命令行中的一些参数运行“pocketsphinx_continous.exe”，一切都会正常工作，并且我会看到软件的输出。终止该进程后，我尝试在我的 java 应用程序中运行它。但是java打印没有输出到控制台。

这是我的代码:

public void start(){
    try {

        Runtime rt = Runtime.getRuntime();
        String[] commands = {"D:/cmusphinx/pocketsphinx/bin/Release/x64/pocketsphinx_continuous.exe", "-hmm", "d:/cmusphinx/pocketsphinx/model/en-us/en-us", "-lm", "d:/cmusphinx/pocketsphinx/model/en-us/en-us.lm.bin", "-dict", "d:/cmusphinx/pocketsphinx/model/en-us/cmudict-en-us.dict", "-samprate", "16000/8000/48000", "-inmic", "yes"};
        Process proc = rt.exec(commands);


        BufferedReader stdInput = new BufferedReader(new InputStreamReader(proc.getInputStream()));

        BufferedReader stdError = new BufferedReader(new InputStreamReader(proc.getErrorStream()));

        // read the output from the command
        System.out.println("Here is the standard output of the command:\n");
        String s = null;
        while ((s = stdInput.readLine()) != null) {
            System.out.println(s);
        }

        // read any errors from the attempted command
        System.out.println("Here is the standard error of the command (if any):\n");
        while ((s = stdError.readLine()) != null) {
            System.out.println(s);
        }

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Java 只会打印“这是命令的标准输出:”，仅此而已。但它不会崩溃，它仍在运行，没有任何错误。在我看来，java 会等待执行的命令完成，直到打印任何内容。但该软件将永久运行并打印一些新的结果......

有什么想法吗？

致以诚挚的问候

迈克

Answer 1

我建议您执行以下操作:

    Process p = null;
    ProcessBuilder b = new ProcessBuilder("D:/cmusphinx/pocketsphinx/bin/Release/x64/pocketsphinx_continuous.exe -hmm d:/cmusphinx/pocketsphinx/model/en-us/en-us -lm d:/cmusphinx/pocketsphinx/model/en-us/en-us.lm.bin -dict d:/cmusphinx/pocketsphinx/model/en-us/cmudict-en-us.dict -samprate 16000/8000/48000 -inmic yes");
    try {
        p = b.start();
    } catch (IOException e) {
        e.printStackTrace();
    }
    BufferedReader output = new BufferedReader(new InputStreamReader(p.getInputStream()));
    String line = null;
    try {
        while ( (line = output.readLine()) != null) {
            System.out.println(line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

使用ProcessBuilder，您不必分隔参数。只需将整个命令复制到 String 中即可。