sampleservlet.java

Veloctiy框架 有VM模板例子 就是把JSP页面的内容给编译成HTML的模板 希望能给大家点帮助

package com.meijia.db;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import  java.io.IOException;
import  java.io.FileNotFoundException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import java.text.SimpleDateFormat;
import java.util.Date;
import  java.util.Properties;
import  java.util.Vector;

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

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

public class SampleServlet extends VelocityServlet   {
	protected Properties loadConfiguration(ServletConfig config)throws IOException, FileNotFoundException{
		/*
		   * 得到属性配置文件并load它
		   */
		String propsFile = config.getInitParameter(INIT_PROPS_KEY);
		Properties p = new Properties();
		if (propsFile != null){
		   String realPath = getServletContext().getRealPath(propsFile);
		   if (realPath != null){
		    propsFile = realPath;
		   }
		   p.load(new FileInputStream(propsFile));
		}
		/*
		   * 设置velocity日志文件在web应用中的位置
		   */
		String log = p.getProperty(Velocity.RUNTIME_LOG);
		if (log != null){
		   log = getServletContext().getRealPath(log);
		   if (log != null)   {
		    p.setProperty(Velocity.RUNTIME_LOG, log); 
		   }
		}
		/*
		   * 设置模板文件在web应用中的位置
		   */
		String path = p.getProperty(Velocity.FILE_RESOURCE_LOADER_PATH);
		if (path != null){
		   path = getServletContext().getRealPath(path);
		   if (path != null){
		    p.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, path);
		   }
		}
		return p;
		}

		public Template handleRequest(HttpServletRequest request,HttpServletResponse response,Context ctx){
		String p1 = "tyl";
		String p2 = "admin";
		Vector personList = new Vector();
		personList.addElement(p1);
		personList.addElement(p2);
		/*
		   * 将模板数据 list 放置到上下文环境 context 中去
		   */
		ctx.put("theList", personList);
		/*
		   * 获取模板对象，有三种可能产生的异常
		   */
		Template outty = null;
		try{
		   outty = getTemplate("sample.vm");
		   String path = getServletContext().getRealPath("/html/");//本WEB程序根目录服务器绝对路径
		   String name = ((new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()))+".html");//最终保存路径
		   File index = new File(path+"\\"+name);
//		   File index = new File("f://test.html");
		   
		    FileOutputStream output = new FileOutputStream(index);
			BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
					output, "utf-8"));
		   PrintWriter dw = new PrintWriter(path+"\\"+name);   
		   outty.merge(ctx, dw);
		   dw.close();
		} catch (ParseErrorException pee){
		   System.out.println(
		    "SampleServlet : parse error for template " + pee);
		}catch (ResourceNotFoundException rnfe){
		   System.out.println("SampleServlet : template not found " + rnfe);
		}catch (Exception e){
		   System.out.println("Error " + e);
		}
		return outty;
		}




}