Comet and Reverse Ajax: The Next-Generation Ajax 2.0 by By (author) Phil McCarthy By (author) Dave Crane

By By (author) Phil McCarthy By (author) Dave Crane

Ajax has been out for your time now, with none massive alterations, development and so forth. good, as time appears to be like close to an Ajax 2.0 evolution, this firstPress bargains with the rising Comet and opposite Ajax applied sciences that can arguably later outline a part of the subsequent new release Ajax 2.0. Comet and opposite Ajax: the following new release Ajax 2.0 is the 1st and simply booklet of its type masking Comet and opposite Ajax during this aspect. Written via Ajax specialist and top promoting writer, Dave Crane, this publication is a realistic, hands-on source for builders who are looking to preview or even use a few of what is going to most likely be within the subsequent sizzling Ajax 2.0 unlock.

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1000) writeText(writer,"cooling. . sleep(sleeptime) } Comet and Reverse Ajax firstPress 35 The entry point for the request is the method called bake. You prime the response by setting a MIME type and repeatedly call the writeText () method. writeText () takes three arguments. , a character-based output stream) belonging to the response object; anything written to this stream will end up in the HTTP response. The remaining two arguments are the text to write to the output stream and the amount of time to suspend the thread for after the text is written.

Direct Web demoting Before we begin, though, let's take a quick look into the history of DWR. DWR first emerged in early 2005 as a web remoting tool built on Ajax. In Java, the standard way of exposing behavior to the web is to write servlets, basically the Java equivalent of CGI scripts. Servlets parse HTTP request parameters, perform operations on server-side objects as required, and 54 firstPress Comet and Reverse Ajax return an HTTP response representing the results of these operations, usually in the form of an HTML document.

Since Word follows the standard JavaBean semantics, all we have to do is specify that DWR should use its built-in introspection-based bean converter to bind values to and from web calls. In more complex cases, where bean introspection isn't sufficient to serialize the data from your objects, you can implement a custom converter yourself That's the DWR configuration dealt with. The only remaining task is to deploy the servlet component of DWR. Comet and Reverse Aiax firstPress 57 DWRServlet DWRServlet is the intermedia^ between DWR's JavaScript code and your Java objects.

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