By Rob Harrop
Nearly any program you construct calls for a few type of output. And the output layout might swap usually, which may end up in a heavy upkeep burden and a restrictive try cycle. yet through the use of the facility of the speed template engine, you could combine templated output into your software, decoupling the appliance good judgment from the output structure.
Pro Jakarta speed: From expert to Expert leads leads you instantly towards configuration and setup, the entire method through to full-blown software improvement. this isn't basically a publication approximately internet improvement, because the multipurpose speed does greater than change JSP. as an alternative, this publication demonstrates many various pace makes use of. This in-depth publication additionally exhibits you ways to combine pace improvement and use it with different open-source frameworks and instruments, equivalent to Spring and Apache Struts.
Table of Contents
- Introducing speed
- Getting begun with pace
- Using the rate Template Language
- Introducing styles and most sensible Practices
- Creating Stand-Alone purposes with speed
- Creating net functions with pace
- Using speed and Anakia
- Using extra pace instruments
- Going within speed
- Extending pace
- Using speed improvement instruments
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Extra resources for Pro Jakarta Velocity: From Professional to Expert
In some cases, this resource can be a filename; in others, it may just bea designated identifier for your templates. The Velocity distribution comes complete with four resource loaders for loading resources: from the file system directly, from a JAR file, from the classpath, and from a J2EE DataSource. In the next section, I'll demonstrate how to use the first three and also show configuration options available for the fourth. Using Multiple Resource Loaders For this section, I've built an example to test three of the four supplied resource loaders.
Vm, in the same directory as all the templates from the previous examples. I've packaged the second template, ResourceLoader2. vm, inside a JAR file and then placed it in the same directory as ResourceLoaden. vm. I've stored the third template, ResourceLoader3. vm, in the root of the classpath. The placement of these files is important; if you place all the templates in the same directory as ResourceLoaderl. vm, they will be picked up by the same resource loader, and you won't be able to see the others in action.
In this case, you don't want the name of the variable appearing in your output. For this purpose, Velocity supports quiet reference notation, which will output the variable value if the variable exists in the context but nothing if it doesn't. To make a variable reference quiet, simply add! undefinedVariable When you now run the example, the output is simply Hello; the variable name isn't included at all in the output. Creating Variables in a Template Up to this point, you've created all the variables in Java code and passed them to the runtime using the VelocityContext.