Java ProcessBuilder显示启动java应用程序的控制台？ [英] Java ProcessBuilder showing console of started java application?

问题描述

我有一个JAVA应用程序启动（使用ProcessBuilder）另一个JAVA应用程序，如下所示：

  String val =something ; 
 ProcessBuilder processBuilder = new ProcessBuilder（java， -  classpath，dir，appName，val）; 
流程p = processBuilder.start（）; 
  

现在，这工作正常，appName使用参数val启动，它运行并运行...很好...问题是没有控制台窗口出现... appName做了很多输出到控制台，我们需要看到它......我怎么能用控制台启动这个过程？

我正在尝试的东西（CMD.exe，java， - classpath，dir，appName，val）等...但我无法正确...

另外，我无法重定向流，我的程序实际上可以启动这些appName的5-10个，每个应该都有自己的控制台窗口显示自己的信息。 / p>

我们非常感谢任何帮助。
谢谢，

解决方案

只有从控制台执行java ....时才存在Console对象否则，获取一个的调用返回null。

如果要查看控制台，则需要打开命令shell控制台（例如windows cmd .exe或Unix bash shell窗口）并输入：

  java -classpath =...com.example.appName arg1 
  

如果你想以不同的方式运行，不好意思，登录到控制台不适合你。相反，使用下列之一记录：

• log4j


• slf4j


• logback

I have a JAVA application that launches (using ProcessBuilder) another JAVA application like this:

String val = "something";
ProcessBuilder processBuilder = new ProcessBuilder("java", "-classpath", dir, appName, val);
Process p = processBuilder.start();

Now, this works fine, appName is launched with the parameter val and it runs and works ... great ... the problem is no Console Window appears ... appName does a LOT of outputting to the console and we need to see it ... how can I start the process with a console?

I am trying stuff like ("CMD.exe", "java", "-classpath", dir, appName, val), etc... but I can't get it right ...

Also, I can't redirect the streams, my program can actually start 5-10 of these appName's, each should have their own console window showing their own information.

Any help would be much appreciated. Thanks,

解决方案

A Console object only exists when you execute java.... from a console. Otherwise, the call to obtain one returns null.

If you want to see a console, you need to open a command shell console (e.g. windows cmd.exe or Unix bash shell window) and type:

java -classpath="..." com.example.appName arg1

If you want to run in a different manner, sorry to say, logging to Console is not for you. Instead, log using one of:

• log4j
• slf4j
• logback

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