Java啓動Node.js程序立即關閉

我正在嘗試製作一個帶有Java FXML接口以及用於製作音頻播放機器人的Node.js程序的Discord機器人。Java啓動Node.js程序立即關閉

當我嘗試打開Java內的Node.js進程時，我注意到它立即關閉，因爲當我嘗試寫入時，出現IOException pipes are being closed。我不確定爲什麼會發生這種情況，因爲當我在命令行中運行節點時，它完全保持打開狀態。有誰知道我的程序爲什麼立即關閉？

Node.js的通信類：

public class NodeCommunicationHandler { 

private static final Logger LOG = Logger.getLogger(NodeCommunicationHandler.class.getName()); 

private Process nodeProcess; 
private ExecutorService threadPool; 
private ProcessHandlerTask callbackHandler; 
private StringProperty callback; 
private OutputStream writeStream; 

/** 
* 
*/ 
public NodeCommunicationHandler() { 
    try { 
     // Activate Node.js sub-process 
     this.nodeProcess = new ProcessBuilder("cmd", "/c", "start", "node", "\"" + Reference.NODE_PROGRAM_LOCATION + "\"").start(); 

     // Initialize the stdout writing stream 
     this.writeStream = this.nodeProcess.getOutputStream(); 

     // Initialize the stdin reader on the process 
     this.callbackHandler = new ProcessHandlerTask(this.nodeProcess); 

     // Bind the callback data from the process to the callback property 
     this.callback = new SimpleStringProperty(); 
     this.callback.bind(this.callbackHandler.messageProperty()); 

     // Run the thread of the process callback handler 
     this.threadPool = Executors.newFixedThreadPool(2); 
     this.threadPool.submit(this.callbackHandler); 
    } catch (IOException ex) { 
     NodeCommunicationHandler.LOG.log(Level.SEVERE, null, ex); 
    } 
} 

/** 
* Retrieve the internal process callback. 
* 
* @return The callback. 
*/ 
public StringProperty getCallback() { 
    return this.callback; 
} 

/** 
* Writes a string command to the Node.js process. 
* 
* @param command The command to write. 
*/ 
public void write(String command) { 
    try { 
     this.writeStream.write(command.getBytes()); 
     this.writeStream.flush(); 
    } catch (IOException ex) { 
     NodeCommunicationHandler.LOG.log(Level.SEVERE, null, ex); 
    } 
} 

/** 
* Stop the Node.js process 
*/ 
public void stop() { 
    try { 
     // Write the command STOP towards the node process to promptly exit the discord API. 
     this.write("STOP"); 

     // Close the writing stream since STOP is the last command we have to write. 
     this.writeStream.close(); 

     // Wait for the Node.js acknowledgement of the STOP issue. 
     NodeProcessExitHandler exitCond = new NodeProcessExitHandler(this.callback); 
     this.threadPool.submit(exitCond).get(); 

     // Unbind the callback listener. 
     this.callback.unbind(); 

     // Stop the callback handler and let the thread finish. 
     this.callbackHandler.stop(); 

     // Keep the process alive until the callback handler has been disconnected. 
     this.threadPool.awaitTermination(10000, TimeUnit.MILLISECONDS); 

     // Kill the subprocess since we know 
     this.nodeProcess.destroy(); 
    } catch (IOException | InterruptedException | ExecutionException ex) { 
     NodeCommunicationHandler.LOG.log(Level.SEVERE, null, ex); 
    } 
} 
}

而且我的JavaScript程序：

var stdin = process.openStdin(); 

stdin.addListener("data", function(d) { 
    console.log("You entered: " + d.toString()); 
});

的JavaScript是很基本的，但它應該能夠提供我所需要的。

編輯：

問題描述中的小錯誤。當進程以Java運行時，它會打開一個控制檯窗口，並且Node程序實際上保持運行，但Outputstream只是斷開連接並引發IOException。

來源

2017-04-08 Thodor12

第二天我啓動應用程序並且該進程能夠連接和發送數據，問題自動解決。我不知道是什麼原因導致它不能在第一時間工作。

來源

2017-04-09 20:09:02 Thodor12

Java啓動Node.js程序立即關閉

回答

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