Velocity 学习实例

最新推荐文章于 2021-03-04 22:15:20 发布

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最新推荐文章于 2021-03-04 22:15:20 发布

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分类专栏： Velocity 文章标签： velocity Java Apache Servlet 数据结构

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本文介绍了一种名为Velocity的视图技术，并提供了一个简单的示例项目。该项目展示了如何使用Velocity进行页面渲染，包括配置环境、创建JavaBean、编写Servlet处理逻辑及Velocity模板文件。

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[color=darkred]因项目需要，最近学习了一种新的视图技术Velocity，就顺便写了一个小例子，希望对初学者有所帮助![/color]

1.以下是工程目录结构
[img]http://dl.iteye.com/upload/attachment/178347/70f0286f-6f93-36bb-b46a-ba17bf5b9b09.jpg[/img]

2.需要用到的包有：velocity-1.4.jar / velocity-dep-1.3.1.jar

3.Person.java 代码


package com.cn.test;

public class Person {
	private String firstname;
	private String lastname;
	private String phone;

	public String getFirstname() {
		return firstname;
	}

	public String getLastname() {
		return lastname;
	}

	public String getPhone() {
		return phone;
	}

	public void setFirstname(String firstname) {
		this.firstname = firstname;
	}

	public void setLastname(String lastname) {
		this.lastname = lastname;
	}

	public void setPhone(String phone) {
		this.phone = phone;
	}
}

4.PersonServlet.java 代码


package com.cn.test;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.velocity.*;
import org.apache.velocity.context.*;
import org.apache.velocity.servlet.*;
import org.apache.velocity.app.*;
import org.apache.velocity.exception.*;

public class PersonServlet extends VelocityServlet {

	protected Properties loadConfiguration(ServletConfig config)
			throws IOException, FileNotFoundException {

		/*
		 * 设置模板文件在web应用中的位置
		 */
		Properties p = new Properties();
		String path = config.getServletContext().getRealPath("/");
		if (path == null) {
			System.out.println("resources not found ");
			path = "/";
		}
		p.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, path);
		p.setProperty("runtime.log", path + "velocity.log");

		return p;
	}

	public Template handleRequest(HttpServletRequest request,
			HttpServletResponse response, Context context) {
		// 创建模版对象
		Template template = null;

		try {
			// 创建集合对象
			Hashtable<String, Person> personlist = new Hashtable<String, Person>();

			// 设置信息
			Person person = new Person();
			person.setFirstname("ZhouXiang");
			person.setLastname("Fei");
			person.setPhone("86249466");
			personlist.put(person.getFirstname(), person);

			person = new Person();
			person.setFirstname("WenLi");
			person.setLastname("Jun");
			person.setPhone("22126536");
			personlist.put(person.getFirstname(), person);

			person = new Person();
			person.setFirstname("KuRu");
			person.setLastname("Two");
			person.setPhone("45682546");
			personlist.put(person.getFirstname(), person);

			context.put("personlist", personlist); // 将模板数据 personlist 放置到上下文环境 context 中去

			template = getTemplate("information.vm");    // 加载模板
		} catch (ParseErrorException ex1) {    // 可能出现的异常
			System.out.println("VelocityAdd: parse error for template " + ex1);
		} catch (ResourceNotFoundException ex2) {
			System.out.println("VelocityAdd: template not found " + ex2);
		} catch (Exception ex3) {
			System.out.println("VelocityAdd: error " + ex3);
		}
		return template;
	}

}

5. information.vm 代码


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
	<head>
		<title>Velocity Example</title>
		<meta http-equiv="keywords" content="enter,your,keywords,here" />
		<meta http-equiv="description" content="A short description of this page." />
		<meta http-equiv="content-type" content="text/html; charset=UTF-8" />

		<!--<link rel="stylesheet" type="text/css" href="styles.css">-->
	</head>
	<body>
		<h1>This is My First Velocity Example</h1>
		<table border="1">
			<tr>
				<td>First Name</td>
				<td>Last Name</td>
				<td>Phone</td>
			</tr>
			#foreach($list in $personlist>
			<tr>
				<td>$list.firstname</td>
				<td>$list.lastname</td>
				<td>$list.phone</td>
			</tr>
			#end
		</table>
	</body>
</html>