example.vm文件编码如下：
##开始
Hello from $name in the $project project.
#set( $this = "TestVelocity")
$this is the best great!
#foreach( $names in $lister )
??? $names is very great!
#end
#set( $condition = true)
#if ($condition)
??? The condition is true!
#else
??? The condition is false!
#end
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velocity.properties文件内容如下：
runtime.log = velocity_example.log
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将上述两个文件放入工程目录下的新建文件夹vm里，然后可以设置路径，在下面的java文件中修改相应的路径就可以了。
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java文件的编码
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package app.example;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.Template;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;
import java.io.*;
import java.util.ArrayList;
public class Example
{
??? public Example(String templateFile)
??? {
??????? try
??????? {
??????????? Velocity.init("vm\\example\\velocity.properties
");
??????????? VelocityContext context = new VelocityContext();
??????????? context.put("lister", getNames());
??????????? context.put("name", "Velocity;;;;;;;");
??????????? context.put("project", "Jakarta....");
??????????? StringWriter sw = new StringWriter();
??????????? String s = "$lister";
??????????? Velocity.evaluate( context, sw, "mystring", s );
??????????? System.out.println(sw);
??????????? 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 );
??????????? }
??????????? BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));
??????????? if ( template != null)
??????????????? template.merge(context, writer);
??????????? writer.flush();?????????
??????????? writer.close();
???????????
???????????
????????
??????? }
??????? catch( Exception e )
??????? {
??????????? System.out.println(e);
??????? }
??? }
??? public static ArrayList<String> getNames()
??? {
??????? ArrayList<String> list = new ArrayList<String>();
??????? list.add("ArrayList element 1");
??????? list.add("ArrayList element 2");
??????? list.add("ArrayList element 3");
??????? list.add("ArrayList element 4");
??????? return list;
??? }
??? public static void main(String[] args)
??? {
??? ??? ?Example t = new Example("vm\\example\\example.vm
");
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//注释部分为另一种用法，效果类似。
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??? /* Velocity.init();
??? ??? ?
??? ??? ?VelocityContext context = new VelocityContext();
??? ??? ?context.put("name", "Velocity;;;;;;;");
???????? context.put("project", "Jakarta....");
???????? context.put("lister", getNames());
??? ??? ?StringWriter sw = new StringWriter();
??? ??? ?Velocity.mergeTemplate("vm\\example\\example.vm", "ISO-8859-1", context, sw );
??? ??? ?String a = sw.toString();
??? ??? ?System.out.println(a);*/
??? ??? ?
??? }
}
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运行结果（控制台输出）如下：
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[ArrayList element 1, ArrayList element 2, ArrayList element 3, ArrayList element 4]
Hello from Velocity;;;;;;; in the Jakarta.... project.
TestVelocity is the best great!
??? ArrayList element 1 is very great!
??? ArrayList element 2 is very great!
??? ArrayList element 3 is very great!
??? ArrayList element 4 is very great!
??? The condition is true!
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