velocity1.7快速上手小例子

1、新建一个java工程，将velocity的jar包添加进编译路径，包括velocity-1.7.jar和lib中的所有jar包，这里给出下载链接：http://velocity.apache.org/download.cgi。

2、给出模板文件：example.vm.

<?xml version="1.0" encoding="UTF-8"?><list>#foreach( $name in $list )$name is fun!#end</list>

3、给出我的测试类，将模板文件和类文件放在一个目录下。

import java.io.BufferedWriter;import java.io.OutputStreamWriter;import java.util.ArrayList;import org.apache.velocity.Template;import org.apache.velocity.VelocityContext;import org.apache.velocity.app.Velocity;import org.apache.velocity.exception.ParseErrorException;import org.apache.velocity.exception.ResourceNotFoundException;public class HelloVeloctiy {public HelloVeloctiy(String templateFile) {try {Velocity.init();/* * Make a context object and populate with the data. This is where * the Velocity engine gets the data to resolve the references (ex. * $list) in the template */VelocityContext context = new VelocityContext();context.put("list", getNames());/* * get the Template object. This is the parsed version of your * template input file. Note that getTemplate() can throw * ResourceNotFoundException : if it doesn't find the template * ParseErrorException : if there is something wrong with the VTL * Exception : if something else goes wrong (this is generally * indicative of as serious problem...) */Template template = null;try {template = Velocity.getTemplate(templateFile);} catch (ResourceNotFoundException rnfe) {System.out.println("Example : error : cannot find template "+ templateFile);} catch (ParseErrorException pee) {System.out.println("Example : Syntax error in template "+ templateFile + ":" + pee);}/* * Now have the template engine process your template using the data * placed into the context. Think of it as a 'merge' of the template * and the data to produce the output stream. */BufferedWriter writer = writer = new BufferedWriter(new OutputStreamWriter(System.out));if (template != null)template.merge(context, writer);/* * flush and cleanup */writer.flush();writer.close();} catch (Exception e) {System.out.println(e);}} public ArrayList getNames()    {        ArrayList list = new ArrayList();        list.add("HelloVelocity 1");        list.add("HelloVelocity 2");        list.add("HelloVelocity 3");        list.add("HelloVelocity 4");        return list;    } public static void main(String[] args)    { HelloVeloctiy t = new HelloVeloctiy("example.vm");    }}

?4、编译执行，看看输出是不是很简单：

<?xml version="1.0" encoding="UTF-8"?><list>HelloVelocity 1 is fun!HelloVelocity 2 is fun!HelloVelocity 3 is fun!HelloVelocity 4 is fun!</list>

?5、关于VTL更多的信息，可以查阅相关资料。