helloworldvtl.java

《基于Eclipse的开源框架技术与实战》[第11章]随书源码

package com.free.vtl.helloworld;

import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;

/**
 * <p>Title: Eclipse Plugin Development</p>
 * <p>Description: Free download</p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: Free</p>
 * @author gan.shu.man
 * @version 1.0
 */

public class HelloWorldVTL {

	public static void main(String[] args) throws Exception {

		//初始化Velocity引擎
		Velocity.init();
		//加载模板
		Template template = Velocity.getTemplate("./WEB-INF/src/helloworldvtl.vm");

		//创建模板上下文
		VelocityContext ctx = new VelocityContext();
		Collection products = new ArrayList();
		products.add(new Product("Product 1", 12.99));
		products.add(new Product("Product 2", 13.99));
		products.add(new Product("Product 3", 11.99));
		//给模板的productList变量赋值
		ctx.put("productList", products);

		//计算所有产品的价值
		Iterator itr = products.iterator();
		double total = 0.00;
		while (itr.hasNext()) {
			Product p = (Product) itr.next();
			total += p.getPrice();
		}

		//给totalPrice变量赋值
		ctx.put("totalPrice", new Double(total));

		Writer writer = new StringWriter();
		//通过模板和上下文生成字符串
		template.merge(ctx, writer);

		//打印生成的内容
		System.out.println(writer.toString());
	}
}