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Server-Side JavaScript

Lucas Smith

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posted 16 years ago

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I did not know where should I put this topis. Sorry for that.

I have a problem. I have to prepare an example of server-side JavaScript. I must show this example during my classes.
Which server can I use?
I searched for that using google, but I noticed that SSJS is very old and I am not able to get environment for that.
What server should I use? Give me some information.
Can you help me, please?

SCJP6, SCWCD5, OCE:EJBD6.
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Ulf Dittmer

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posted 16 years ago

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I think the only server that supported that out of the box was Netscape iPlanet, and that's long gone.

But a web app could use JavaScript scripts to do any number of things (say, for configuration or customization). There's a very capable JavaScript implementation written in Java that you could use for this; it's called Rhino and is available at www.mozilla.org/rhino. (Starting with Java 6, it's also part of Java SE, and can be used through the javax.scripting API).

Lucas Smith

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posted 16 years ago

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OK, and it can be said that it's server-side implementation of JavaScript?

SCJP6, SCWCD5, OCE:EJBD6.
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Ulf Dittmer

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posted 16 years ago

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It's a server-side use of JavaScript. The implementation (Rhino) is agnostic of any use you may put it to.

Rob Spoor

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posted 16 years ago

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I believe Lucas is looking for a server that will execute JavaScript in the same way as Tomcat executes JSP, IIS executes ASP with VBScript and the PHP engine executes PHP pages.

If I recall correctly, ASP can execute JavaScript (or JScript). See http://www.w3schools.com/asp/asp_syntax.asp and http://aspjavascript.com/.

SCJP 1.4 - SCJP 6 - SCWCD 5 - OCEEJBD 6 - OCEJPAD 6
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Ulf Dittmer

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posted 16 years ago

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I believe Lucas is looking for a server that will execute JavaScript in the same way as Tomcat executes JSP, IIS executes ASP with VBScript and the PHP engine executes PHP pages.

If that's the case, then Jakarta BSF 2.4 can be used in conjunction with the BSF taglib to enable JavaScript's use as a scripting language in JSPs. It's not quite as "first-class" as Java in general is in JSPs, but it may fit the bill.

Lucas Smith

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posted 16 years ago

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Dear friends,
I want to execute something like this:

As it stands in:
http://docs.sun.com/source/816-6411-10/sampapp.htm#1012740

What should I do?

SCJP6, SCWCD5, OCE:EJBD6.
BLOG: http://leakfromjavaheap.blogspot.com

Ulf Dittmer

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posted 16 years ago

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Oh dear, that looks indeed like a manual for the old Netscape server, which Sun took over at some point, and which has been obsolete for years. It's modern-day heir is the http://en.wikipedia.org/wiki/Sun_Java_System_Web_Server, but I've no idea if it still has that JavaScript support. I would guess not, because that's what JSP is used for these days in the Java world.

Lucas Smith

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posted 16 years ago

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So no rescue for me

SCJP6, SCWCD5, OCE:EJBD6.
BLOG: http://leakfromjavaheap.blogspot.com

Lucas Smith

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posted 16 years ago

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I have created something like this:

package math;

import javax.servlet.jsp.tagext.*;
import javax.servlet.jsp.*;
import javax.servlet.*;
import java.io.*;

import javax.script.*;

public class PrimeNumbersHandler extends SimpleTagSupport {
	private int interval;
	public void setInterval(int i){
		interval = i;
	}
	public int getInterval(){
		return interval;
	}
	
	public void doTag() throws IOException{
		ScriptEngineManager sem = new ScriptEngineManager();
		ScriptEngine jsEngine = sem.getEngineByName("JavaScript");
		ScriptContext scriptContext = jsEngine.getContext();
		scriptContext.setWriter(getJspContext().getOut());
		jsEngine.setContext(scriptContext);
		Invocable invocableEngine = (Invocable)jsEngine;
		InputStream is = ((PageContext)getJspContext()).getServletContext().getResourceAsStream("/WEB-INF/scripts/prime.js");
		Reader reader = new InputStreamReader(is);
		
                //below is a string but only for a conceptual reason. i do not use it.
		String script= "function prime(interval){" +
							"for (i=2; i<=interval; i++) {" +
								"prime=true;" +
								"for (j=2; j<i; j++) {" +
									"if (i%j==0){prime=false;break}" +
								"};" +
								"if (prime){print(i+\" \")};" +
							"}"+
						"}";

try{
			jsEngine.eval(reader);
			invocableEngine.invokeFunction("prime", interval);
		}catch(Exception ex){
			ex.printStackTrace();
		}
	}
}

prime.js

What do you think? Is it a good example of server side JS?

SCJP6, SCWCD5, OCE:EJBD6.
BLOG: http://leakfromjavaheap.blogspot.com

Ulf Dittmer

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posted 16 years ago

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It's functional, but a bit dull, since it doesn't provide any benefit that straight Java code couldn't have provided, too. If the script resided in its own file, and if there were a background job that periodically checked whether the file had been updated, and if it was, reloaded the script, you'd have something that would be handy for dynamic server reconfiguration.

Lucas Smith

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posted 16 years ago