Tomcat无法执行外部Java程序 [英] Tomcat fails to execute external java program

问题描述

我是JSPs/Tomcat的新手，并且在Java方面也是一个新手.这就是我要做的-当用户单击按钮/访问URL时，我想启动一个Java程序(带有一些命令行参数).

I am a total newbie in JSPs/Tomcat and to a large extent in Java as well. Here's what I have to do -- when a user clicks a button/visits a URL, I want to launch a Java program (which takes some command line arguments).

我可以很容易地完成

Runtime.exec("C:\\Python27\\python.exe test.py") 

或

Runtime.exec("java -cp %CLASSPATH%;C:\\devprojects HelloWorld"

，这很好. HelloWorld.class只是在其中打印"HelloWorld"的地方.

and this works fine. Where HelloWorld.class just prints "HelloWorld".

但是，当我尝试使用带有命令行参数的Java程序时，GET请求只是挂起而没有执行任何操作.我不知道要查找什么日志，或者这里可能出了什么问题.在花了两天时间尝试各种事情之后，我现在要放弃了.

However, when I attempt a java program which takes command line arguments, the GET request just hangs doing nothing. I don't know what logs to look for or what could be wrong here. After having spent TWO days on trying various things, I am just about to give up now.

Runtime.exec("java -cp %CLASSPATH%;C:\\devprojects Run --username Blah --password Foo");

Tomcat最终以哪个用户身份运行此Java程序?我可以成为管理员吗?这是在Windows 2008上，UAC是否会干扰事物?

What user does Tomcat end up running this java program as? Can I make it to be Administrator? This is on Windows 2008, does UAC interfere with things?

我不能在这里修改Run.class，我必须按原样并使用命令行参数来运行它.

I cannot modify the Run.class here, I HAVE to run it as is and with command line parameters.

请告知.

推荐答案

一个想法:您将命令行的默认标记化为一个完整的String，并且它没有像您期望的那样解析最后一个.相反，您应该在自己切掉命令行之后使用采用String[]的这种方法的形式:

One idea: you are relying on the default tokenization of your command line as one complete String, and it is not parsing the last one as you expect. Instead you should use the form of this method that takes a String[], after you have chopped up the command line yourself:

http://docs.oracle.com/javase/6/docs/api/java/lang/Runtime.html#exec(java.lang.String [])

或者，它正在等待您的输入，或者正在等待您读取其输出.这可以解释挂起.在互联网上搜索流和Runtime.exec()的危险.

Or, it is waiting for input from you, or waiting for you to read its output. This could explain the hang. Search the internet for the dangers of streams and Runtime.exec().

请考虑ProcessBuilder.

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