Question

我正在尝试让我的程序启动Enchanter到SSH到我的服务器，但似乎无法弄清楚如何进入并输出到stdin和stdout，或者在任何地方。我只是在Netbeans中得到一个空白的输出窗口。如何让Jar运行，并获得输入/输出？

public class openShell {

public void openShell() throws IOException {
        String line; 
        Scanner scan = new Scanner(System.in);  
        ProcessBuilder builder = new ProcessBuilder ("C:\\Program Files\\Java\\lib\\enchanter-beanshell-0.6.jar", "myscript.bsh"); 
        builder.redirectErrorStream(true); 
        Process process = builder.start();  
        OutputStream stdin = process.getOutputStream (); 
        InputStream stderr = process.getErrorStream (); 
        InputStream stdout = process.getInputStream ();  
        BufferedReader reader = new BufferedReader (new InputStreamReader(stdout)); 
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(stdin));  


        while (scan.hasNext()) { 
        String input = scan.nextLine(); 
        if (input.trim().equals("exit")) { 
            // Putting 'exit' amongst the echo --EOF--s below doesn't work. 
            writer.write("exit\n"); 
        } else { 
            writer.write("((" + input + ") && echo --EOF--) || echo --EOF--\n"); 
        } 
        writer.flush(); 

        line = reader.readLine(); 
        while (line != null && ! line.trim().equals("--EOF--")) { 
            System.out.println ("Stdout: " + line); 
            line = reader.readLine(); 
        } 
        if (line == null) { 
            break; 
        } 
    } 
}
}


private void LaunchButtonActionPerformed(ActionEvent evt) {
   //openShell open = new openShell();     //RUNS BUT NO IN OR OUTPUT

   //BELOW CODE IS FOR TESTING, JUST TRYING TO GET PROCESSBUILDER TO CONNECT 
   // TO MY JAR
   try {
      ProcessBuilder builder = new ProcessBuilder(
         "Java -jar C:\\Program Files\\Java\\lib\\enchanter-beanshell-0.6.jar"); 
      builder.redirectErrorStream(true); 
      Process process = builder.start();
   } catch (IOException ex) {
       Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
   }
}

Answer 1

方法ProcessBuilder.inheritIO将在stdin，stdout和stderr中重定向命令流。这适用于Java 7。

Answer 2

String[] args = {
  "java", 
  "-jar", 
  "C:\\Program Files\\Java\\lib\\enchanter-beanshell-0.6.jar"
};
ProcessBuilder builder = new ProcessBuilder(args);

首先打破上面的参数。然后实施When Runtime.exec() won't的所有建议。

Answer 3

方法Process.getInputStream和Process.getOutputStream将为您提供可以随时读取和写入的流。

运行processbuilder并进入并输出

3 个答案: