VelocityServlet 实现示例-CSDN博客

本文链接：https://blog.csdn.net/iteye_13419/article/details/81968355

VelocityServlet：


package org.liufei.velocity;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;

import javax.servlet.ServletConfig;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.velocity.Template;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.context.Context;
import org.apache.velocity.servlet.VelocityServlet;

@SuppressWarnings("deprecation")
public class AddServletVelocity extends VelocityServlet {

	private static final long serialVersionUID = -5343161778899944087L;

	@Override
	protected Template handleRequest(HttpServletRequest request, HttpServletResponse response, Context ctx) throws Exception {
		Template template = null ;
		try{
			int a = 11 ;
			int b = 22 ;
			int c = a + b ;
			ctx.put("a", new Integer(a)) ;
			ctx.put("b", new Integer(b)) ;
			ctx.put("c", new Integer(c)) ;
			template = getTemplate("add.vm") ;
		}catch (Exception e) {
			System.out.println(e.getLocalizedMessage());
		}
		return template;
	}

	@Override
	protected Properties loadConfiguration(ServletConfig servletConfig) throws IOException, FileNotFoundException {
		Properties properties = new Properties() ;
		String path = servletConfig.getServletContext().getRealPath("/") ;
		if(path == null){
			System.out.println("Error !");
			path = "/" ;
		}
		properties.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, path) ;
		properties.setProperty("runtime.log", path + "velocity.log") ;
		properties.setProperty(Velocity.ENCODING_DEFAULT, "UTF-8");
		properties.setProperty(Velocity.INPUT_ENCODING, "UTF-8");
		properties.setProperty(Velocity.OUTPUT_ENCODING, "UTF-8");  
		return properties ;
	}

}

vm模板：

<html>
  <head>
    <title>Velocity Test</title>
  </head>
  <body>
  	<h1>Velcity Excemple</h1>
  	<p>$a + $b = $c</p>
  </body>
</html>

web.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

	<servlet>
		<servlet-name>add</servlet-name>
		<servlet-class>org.liufei.velocity.AddServletVelocity</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>add</servlet-name>
		<url-pattern>/add</url-pattern>
	</servlet-mapping>

	<!--
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	-->
</web-app>