By Joseph D. Gradecki, Jim Cole
A entire instructional on how one can use the facility of speed 1.3 to construct sites and generate content
Designed to paintings hand-in-hand with Apache Turbine, Struts, and servlets, pace is a strong template language that enormously complements the developer's skill to customise websites. It separates Java code from the net pages, creating a website extra maintainable. due to this, it's a doable substitute to JSPs and Hypertext Preprocessor and is anticipated to develop into the normal template engine. as well as its use with Struts and Turbine, pace is also used to generate Java and XML resource code, XML schemas, HTML templates, and SQL code.
regardless of all its promise, discovering specialist directions on tips to correctly software with this language has been tough. This code-intensive educational promises all of the instruments you will need.
It starts off by means of quick bringing you on top of things on all the speed basics and the rate Template Language. you are going to then how you can follow pace in numerous components with assistance from richly targeted code examples. also, you may be taken during the steps of establishing an entire program that allows you to see how one can make the most of all the suggestions and applied sciences mentioned within the publication. overlaying the newest beneficial properties of speed 1.3, studying Apache pace indicates you the way to:
* construct Java-based sites with Struts, servlets, Turbine, and different open-source tools
* Generate a large choice of websites and code, together with Java, XML, SQL, and Postgres
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Additional info for Mastering Apache Velocity (Java Open Source Library)
Next, the template created by the designer is obtained using the getTemplate() method, as well as a StringWriter that handles the HTML output. Finally, the template and the context are merged together with the merge() method. A few details are missing from this example, which we cover in the next chapter, but it serves to illustrate what the developer must do in order to provide the dynamic information needed by the designer’s template. In this example, we assigned a simple String object to the context, but we could have also introduced more complex objects and used Velocity to access both the attributes and methods of the objects.
There has been quite a bit of work to incorporate the concepts found in MVC into modern languages. Observer, which allow classes to be created that can be observed and Extending MVC to Web Applications 13 informed of state changes. In the remainder of this chapter, we look at the progression the MVC paradigm has gone through to make it relevant to Web development. Sun Models 1 and 2 We have just described the typical MVC architecture as defined for Smalltalk-80 and further refined into an architectural paradigm.
This example uses a Singleton pattern for the relationship between your application and the Velocity engine. This means only one static engine is available for all the application objects. It is important to remember this fact because you won’t see any code in this example to instantiate the engine. Once the engine has been initialized, it’s time to load the template from the local hard drive. The template is loaded using the getTemplate(String) method of the Velocity engine object. The result of the method call is a Template object; otherwise, an exception is thrown.