how to get javascript variable in java? (like javascript parser?)

Question

like code:

public static void main(String[] args) throws Exception {
    String content="<HTML>"
     +"<HEAD><TITLE>title</TITLE></HEAD>"
     +"<BODY>"
     +"<script>var jsvar=123;</script>"
     +"</div>"
     +"</BODY>"
     +"</HTML>"
    ;
}

in this case,how to get jsvar variable value?

thanks for help :)

Marimuthu Madasamy · Accepted Answer · 2010-08-26 09:35:08Z

2

If you want to execute JavaScript code in Java, You can use scripting API of Java 6 and Java 6 is included with Mozilla Rhino engine.

ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine jsEngine = mgr.getEngineByName("JavaScript");
jsEngine.eval("jsvar = 123");
System.out.println(jsEngine.get("jsvar")); //prints 123.0

Reference: http://download-llnw.oracle.com/javase/6/docs/technotes/guides/scripting/programmer_guide/index.html

answered Aug 26, 2010 at 9:35

Marimuthu Madasamy

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Ollie Edwards · Accepted Answer · 2010-08-26 08:52:38Z

0

Seems to me that this is backward. If you are serving the page then you already have the value on the server. I would inject the value from Java into JavaScript not the other way around.

answered Aug 26, 2010 at 8:52

Ollie Edwards

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Riduidel · Accepted Answer · 2010-08-26 08:54:41Z

0

In fact, you're asking something that requires a browser. As a consequence, you may have to take a look at HtmlUnit, which could solve your issue.

However, were you to directly run pure javascript code from Java, you would have better using a Javascript interpreter like Rhino (I think).

answered Aug 26, 2010 at 8:54

Riduidel

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