如何從Java代碼運行命令並讀取輸出？

Question

我正在編寫代碼以執行命令並讀取輸出如果我在命令提示符下運行命令，則看起來像這樣

命令是

echo 'excellent. awesome' | java -cp "*" -mx5g edu.stanford.nlp.sentiment.SentimentPipeline -stdin

命令產生多行輸出。 如何在我的Java代碼中打印此輸出？

我已經編寫了以下代碼，但是它產生的輸出本身就是命令

echo 'excellent. awesome' | java -cp "*" -mx5g edu.stanford.nlp.sentiment.SentimentPipeline -stdin

而不是實際的命令輸出，如我們在屏幕截圖中所見

    final String cmd = "java -cp \"*\" -mx5g edu.stanford.nlp.sentiment.SentimentPipeline -stdin";
    final String path = "C:/Project/stanford-corenlp-full-2015-01-29/stanford-corenlp-full-2015-01-29"; 

    String input = "excellent";
    String cmdString = "echo '" +input + "' | " + cmd;
    Process process = Runtime.getRuntime().exec(cmdString,null, new File(path));
    process.waitFor();
    BufferedReader reader = new BufferedReader(new   InputStreamReader(process.getInputStream()));
    String line = reader.readLine();
    while (line != null) {
        System.out.println(line);
        line = reader.readLine();   
    }

Answer 1

嘗試使用ProcessBuilder：

try {
        ProcessBuilder pb = new ProcessBuilder("your command here");
        pb.redirectErrorStream(true);
        Process p = pb.start();
        InputStream is = p.getInputStream();
        BufferedReader br = new BufferedReader( new InputStreamReader( is ) );
        while ((line = br.readLine()) != null) {
                System.out.println(line);
        }
        p.waitFor();
} catch (InterruptedException e) {
    //handle exception
}