java Velocity 的宏定義實例

一個簡單的例子用來演示 Velocity 的宏定義

VMDemo.java

import java.io.StringWriter;
import java.io.Writer;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.IteratorTool;

public class VMDemo {

  public static void main(String[] args) throws Exception {
    Velocity.init();

    Template t = Velocity.getTemplate("./src/demo.vm");

    VelocityContext ctx = new VelocityContext();
    ctx.put("var", new IteratorTool());

    Writer writer = new StringWriter();
    t.merge(ctx, writer);

    System.out.println(writer);
  }
}

demo.vm

#macro( tablerows $color $somelist )
  #foreach( $something in $somelist )
      <tr><td bgcolor=$color>$something</td></tr>
  #end
#end

#set( $greatlakes = ["Superior","Michigan","Huron","Erie","Ontario"] )
#set( $color = "blue" )
<table>
    #tablerows( $color $greatlakes )
</table>