velocity例子

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jsp页面：index。

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body><pre name="code" class="html"> This is my JSP page. <br> <a href="Vlt?method=create">test</a> <a href="html/test.html">vm</a> </body></html>

servlet::Vlt.java

package demo;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.velocity.VelocityContext;public class Vlt extends HttpServlet {/** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. *  * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}/** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. *  * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String flag=request.getParameter("method");if("create".equals(flag)){//模板路径String realPath=request.getRealPath("/");String url="demo.vm";//生成静态页面路径String url2="E:/Demo/VelocityDemo/WebRoot/html/test.html";VelocityContext context=new VelocityContext();  context.put("name", "张三");              String[] hobbyArray={"吃饭","喝水","洗澡"};              context.put("hobby", "爱好");              context.put("hobbyArray", hobbyArray);  /*context.put("title", "welcome to my page你好!");*/CreateHtml.createHtml(realPath,url, url2, context);response.sendRedirect("/index.jsp");}else{response.sendRedirect("/index.jsp");}}}

创建Html的java类：CreateHtml.java

package demo;import java.io.FileNotFoundException;import java.io.PrintWriter;import java.util.Properties;import org.apache.velocity.Template;import org.apache.velocity.VelocityContext;import org.apache.velocity.app.Velocity;import org.apache.velocity.exception.ParseErrorException;import org.apache.velocity.exception.ResourceNotFoundException;public class CreateHtml {public static void createHtml(String realPath,String url,String url2,VelocityContext context) {        try {        Properties properties = new Properties();          //设置加载的路径        properties.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH,realPath);        Velocity.init(properties);        String s=realPath+url;            //初始化vm模板            Template template=Velocity.getTemplate(url,"UTF-8");            //生成html页面            PrintWriter pw=new PrintWriter(url2);            template.merge(context, pw);            //关闭流            pw.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (ResourceNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (ParseErrorException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }           }}

Velocity模板：demo.vm

 ##宏定义 #macro( d $name)<a href="#">$name</a>#end     $name$hobby:#foreach($hobby in $hobbyArray)${hobby}#end    ##宏调用 #foreach($hobby in $hobbyArray)   #d($hobby) #end    #set ($i=0)##定义变量    #foreach($hobby in $hobbyArray) 序号:$i#set($i=$i+1) #end   #*文件包含 如：#parse("/blog/top.html")或#include("/blog/top.html")#include( "one.gif","two.txt","three.htm" )parse与include的区别在于，若包含的文件中有Velocity脚本标签，将会进一步解析，而include将原样显示。*##parse("testInclude.vm")##条件语句#set($foo="deng")#if( $foo )<strong>找到${foo}!</strong>#else查找失败了！#end

生成的Html：test.html

    张三爱好:吃饭喝水洗澡        <a href="#">吃饭</a>      <a href="#">喝水</a>      <a href="#">洗澡</a>     序号:0 序号:1 序号:2   say:hello world<strong>找到deng!</strong>

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