Evaluating an HTML/JS string in Java

Question

I have a Java string containing HTML/JS/CSS code like this (very simple example):

<div>Welcome</div>
<style type="text/css">
.title{
color:red
}
</style>
<script type="text/javascript">
var i=0;
for (i=0;i < 5;i++){
document.writeln("<div class='title'>" + i + "</div>");
}
</script>

I receive that string on the Java side.

What I want is to "render" that string as it will be displayed on the browser.

So, I want to obtain the following result on my Java side :

Welcome
0
1
2
3
4

Is there a method like this ?

String renderedHTMLJS = therenderingmethod(htmljsString);

How can I do this ?

Thank you

What do you mean by Java to evaluate that string ? What op you want? — Ajinkya
– Ajinkya, Commented Jan 4, 2012 at 8:50
You can try and use rhino (I use it for the regex engine), but it won't affect document (I think) — fge
– fge, Commented Jan 4, 2012 at 8:53
I mean to generate the output on the Java side. I don't know, maybe a function like this : if (generate(htmljsString).isEmpty){ System.out.println("the htmljsString won't generate something on the client browser");} — Divy
– Divy, Commented Jan 4, 2012 at 8:53

RanRag · Accepted Answer · 2012-01-04 09:30:01Z

3

Try using Rhino from Mozilla and using its integration libraries or by using the JDK 1.6 ScriptEngine facility.

For ScriptEngine Example take a look here- http://metoojava.wordpress.com/2010/06/20/execute-javascript-from-java/

edited Jan 4, 2012 at 9:30

answered Jan 4, 2012 at 9:24

RanRag

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7 Comments

Divy Over a year ago

AFAIK, ScriptEngine is for scripting only. It cannot "renders" the HTML part.

vickirk Over a year ago

Should be fine, but a document object will have to injected into the context, doesn't have to be a DOM, just a mock object to capture data passed to writeln (and any other methods).

Divy Over a year ago

@vickirk In my example (ex : "<div>Welcome</div>" at the very top), some parts of the DOM are "static". Can ScriptEngine renders them ?

RanRag Over a year ago

I agree with vickirk a DOM or any other object has to be introduced to pass the data to the methods.

Divy Over a year ago

@RanRag How do you inject static DOM to a JavaScript Engine ? it's like your are writing the following code : <script type="text/javascript"><b>Welcome</b></script> which is totally wrong. May be am I missing something? can you show us some code ?

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