velocity1.7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。

原文转自：http://blog.csdn.net/huangyunzeng2008/article/details/7031712