Tutorial Java Ajax DWR Project. Contribute to mah/Sample-DWR development by creating an account on GitHub. Direct Web Remoting (DWR) is an Open Source initiative that provides easy Ajax for Java. Besides being the best Ajax framework for Java. With Reverse Ajax, DWR allows Java code running on a server to use client side APIs to publish updates to arbitrary groups of browsers. This allows interaction.
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However, up until now there has always been a very loose coupling between the DWR configuration and the Spring configuration. For more information on how DWR was configured to work with Spring in the past see one of my earlier post on using DWR tjtorial conjunction with Spring note that it is fairly outdated.
Joe and I are pleased to announce that a new configuration mechanism is available when using DWR in conjunction with Spring. Using the new namespace support provided ahax Spring 2. This means that when using Spring you will no longer need to create a separate dwr.
Next to eliminating the need for an extra configuration file, it also provides a tight coupling between the bean s you want to remote and the DWR configuration.
As you will see in a moment, you can now specify the fact that you want to remote a certain bean directly onto that specific bean. This leads to a much more intuitive, readable and maintainable configuration.
Two other advantages of using this new way of configuration are that first of all this eliminates the problems we had when directly remoting proxied beans e. Of course you do not need to use this new configuration mechanism, you can choose to keep using the old way of configuring DWR.
But if you take a look tutogial the new mechanism, I am fairly sure that you will be just as enthusiastic tutoria, I am about this new feature!
DWR (Java) – Wikipedia
It is also heavily dependent on the namespace support provided by Spring 2. Enough talk, let us have a look at sample configuration.
Assume the following Spring configuration file:. This is something which is available since Spring 2. The ajaxFacade bean is just an ordinary bean configured in Spring which has a reference to some Data Access Object DAO defined in another application context. In futorial case we need to include the DWR namespace into the header of the document. To include it we change the header to the following:.
Direct Web Remoting
First of all you need to define the XML namespace xmlns by providing an alias, in this case dwr and link it to the URI of the schema. Note that the dwr alias can be replaced with anything you want as long as you use your alias in the next examples instead of the dwr one.
IntelliJ and Eclipse you should navigate inside the myService bean and use the autocomplete functionality to show you all available tags provided by the DWR namespace. Note that the dwr: So now, the bean myService bean definition should look like the following:.
DWR – Easy Ajax for JAVA
However, we do need to somehow expose DWR to the outside world. Here you have two possibilities where the choice is mostly dependent on whether you are using Spring MVC for your web application in which case you should go with the DwrController or using any other web framework then go with the DwrSpringServlet.
You will benefit from a number of services provided to you by Spring MVC, like localization support. The easiest way to use this controller is again use a tag provided by the DWR namespace:. Note that the debug property is optional and defaults to false.
In case you are not using Spring MVC, you can still use the configuration mechanism introduced here. Just define the org. DwrSpringServlet in your web. The servlet will automatically retrieve its configuration from the Spring bean container loaded by the ContextLoaderListener. I have uploaded a sample skeleton application, which should get you started with using these new features:.
Assume the following Spring configuration file: To include it we change the header to tutoriql following: So now, the bean myService bean definition should look like the following: The easiest way to use this controller is again use a tag provided by the DWR namespace: Password protecting web applications in tomcat.