Writing Ajax code in JAVA

Question

I want to write ajax code in java i.e. i want use the functionality of ajax without using ajax. I'm looking for some API of JAVA which can do so.

Like we post data of a web page through JAVA program similarly I want to perform operation of ajax through JAVA program.

Please suggest.

Answer 1

Google Web Toolkit is Java-only framework for writing AJAX aplications.

Answer 2

you can submit form to servlet, when servlet response, you using jquery or prototype javascript framwork to get data from server by using Ajax call function. I tried it and it run smoothly!

Good luck!

Answer 3

You can use jQuery for this. In jQuery you have the great form plugin which unobtrusively changes an existing form into an ajaxform.

HTML (in JSP):

<form id="myform" action="myservlet" method="post"> 
    <input type="text" name="foo"> 
    <input type="submit"> 
</form>
<div id="message">${message}</div>

JS ((in)directly in JSP):

$('#myform').ajaxForm({
    success: function(message) { $('#message').text(message); }
});

Java ((in)directly in doPost() method of the Servlet behind myservlet):

String foo = request.getParameter("foo");
String message = "You entered 'bar': " + ("bar".equals(foo) ? "yes" : "no");

if ("XMLHttpRequest".equals(request.getHeader("x-requested-with"))) {
    // Ajax request.
    response.getWriter().write(message);
} else {
    // Normal request.
    request.setAttribute("message", message);
    request.getRequestDispatcher("page.jsp").forward(request, response);
}

If you want to get some steps further, you can use Gson in Servlet to convert complete Java objects to Javascript object notation (JSON). This way you can access the data the javabean-like way in Javascript.

Answer 4

The quick answer is GWT. However, why would you want to do this? JavaScript is similar to Java. If you know Java, then you can easily write JavaScript code. The advantage of using JavaScript would be that you would be more versatile and would not be locked into a single tool. Using GWT to generate JavaScript (AJAX) code is not natural.

Answer 5

If your application is running on browser and its a web application, you can go with GWT. If your application is a core java application.. you can simply create a HttpURLConnection and use it.

Answer 6

Echo is an alternative to gwt

Answer 7

JavaServer Faces (JSF) 2.0 should be able to do partial updates of a page in place, using AJAX under the covers. It sounds to me as if that is what you need.

I think the easiest way to get a JSF 2.0 capable server running right now, is using the latest version of Glassfish.

Answer 8

I suggest you take a lok at DWR - Easy Ajax for Java:

DWR is a Java library that enables Java on the server and JavaScript in a browser to interact and call each other as simply as possible.

DWR is Easy Ajax for Java

It enables you to ajax-ify your web application with minimal effort. It is not a complete new web-framework; it focuses solely on ajaxification, allowing you to keep and use your existing web framework.

If you want to use a "heavier" web framework like JSF, there exist ajax-ready JSF frameworks like IceFaces and RichFaces with provide ajax out-of-the-box.

Answer 9

There are plenty of Java based AJAX frameworks out there.

• Apache Struts [complex AJAX-tags (by integrating DOJO-toolkit)]

• Direct Web Remoting is a framework for calling Java methods directly from Javascript code.

• Guise™ Framework - elegant server-side component architecture that doesn't require developers to write HTML or JavaScript

• GWT - Java software development framework that makes writing AJAX applications

• JAXCENT - Just-Java Framework and API for AJAX

• IT Mill - Ajax framework for developing web applications for with Java language at server-side

and even more JAVA AJAX Frameworks