学步园

最近在做一个项目，其中一部分的访问频率较高但内容变动较小。所以使用网站HTML静态化方案来优化访问速度

当一个Servlet资源请求到达WEB服务器之后我们会填充指定的JSP页面来响应请求:

HTTP请求---Web服务器---Servlet--业务逻辑处理--访问数据--填充JSP--响应请求

HTML静态化之后:

HTTP请求---Web服务器---Servlet--HTML--响应请求

嘿嘿，是不是很爽？省去了业务逻辑处理和数据抓取直接响应。

Servlet:

public void doGet(HttpServletRequest request, HttpServletResponse response)<br /> throws ServletException, IOException {<br /> if(request.getParameter("chapterId") != null){<br /> String chapterFileName = "bookChapterRead_"+request.getParameter("chapterId")+".html";<br /> String chapterFilePath = getServletContext().getRealPath("/") + chapterFileName;<br /> File chapterFile = new File(chapterFilePath);<br /> if(chapterFile.exists()){response.sendRedirect(chapterFileName);return;}//如果有这个文件就告诉浏览器转向<br /> INovelChapterBiz novelChapterBiz = new NovelChapterBizImpl();<br /> NovelChapter novelChapter = novelChapterBiz.searchNovelChapterById(Integer.parseInt(request.getParameter("chapterId")));//章节信息<br /> int lastPageId = novelChapterBiz.searchLastCHapterId(novelChapter.getNovelId().getId(), novelChapter.getId());<br /> int nextPageId = novelChapterBiz.searchNextChapterId(novelChapter.getNovelId().getId(), novelChapter.getId());<br /> request.setAttribute("novelChapter", novelChapter);<br /> request.setAttribute("lastPageId", lastPageId);<br /> request.setAttribute("nextPageId", nextPageId);<br /> new CreateStaticHTMLPage().createStaticHTMLPage(request, response, getServletContext(),<br /> chapterFileName, chapterFilePath, "/bookRead.jsp");<br /> }<br /> } 

生成HTML静态页面的类:

package com.jb.y2t034.thefifth.web.servlet;<br /> import java.io.ByteArrayOutputStream;<br /> import java.io.FileOutputStream;<br /> import java.io.IOException;<br /> import java.io.OutputStreamWriter;<br /> import java.io.PrintWriter;<br /> import javax.servlet.RequestDispatcher;<br /> import javax.servlet.ServletContext;<br /> import javax.servlet.ServletException;<br /> import javax.servlet.ServletOutputStream;<br /> import javax.servlet.http.HttpServletRequest;<br /> import javax.servlet.http.HttpServletResponse;<br /> import javax.servlet.http.HttpServletResponseWrapper;<br /> /**<br /> * 创建HTML静态页面<br /> * 功能：创建HTML静态页面<br /> * 时间：2009年1011日<br /> * 地点：home<br /> * @author mavk<br /> *<br /> */<br /> public class CreateStaticHTMLPage {<br /> /**<br /> * 生成静态HTML页面的方法<br /> * @param request 请求对象<br /> * @param response 响应对象<br /> * @param servletContext Servlet上下文<br /> * @param fileName 文件名称<br /> * @param fileFullPath 文件完整路径<br /> * @param jspPath 需要生成静态文件的JSP路径(相对即可)<br /> * @throws IOException<br /> * @throws ServletException<br /> */<br /> public void createStaticHTMLPage(HttpServletRequest request, HttpServletResponse response,ServletContext servletContext,String fileName,String fileFullPath,String jspPath) throws ServletException, IOException{<br /> response.setContentType("text/html;charset=gb2312");//设置HTML结果流编码(即HTML文件编码)<br /> RequestDispatcher rd = servletContext.getRequestDispatcher(jspPath);//得到JSP资源<br /> final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();//用于从ServletOutputStream中接收资源<br /> final ServletOutputStream servletOuputStream = new ServletOutputStream(){//用于从HttpServletResponse中接收资源<br /> public void write(byte[] b, int off,int len){<br /> byteArrayOutputStream.write(b, off, len);<br /> }<br /> public void write(int b){<br /> byteArrayOutputStream.write(b);<br /> }<br /> };<br /> final PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(byteArrayOutputStream));//把转换字节流转换成字符流<br /> HttpServletResponse httpServletResponse = new HttpServletResponseWrapper(response){//用于从response获取结果流资源(重写了两个方法)<br /> public ServletOutputStream getOutputStream(){<br /> return servletOuputStream;<br /> }<br /> public PrintWriter getWriter(){<br /> return printWriter;<br /> }<br /> };<br /> rd.include(request, httpServletResponse);//发送结果流<br /> printWriter.flush();//刷新缓冲区，把缓冲区的数据输出<br /> FileOutputStream fileOutputStream = new FileOutputStream(fileFullPath);<br /> byteArrayOutputStream.writeTo(fileOutputStream);//把byteArrayOuputStream中的资源全部写入到fileOuputStream中<br /> fileOutputStream.close();//关闭输出流，并释放相关资源<br /> response.sendRedirect(fileName);//发送指定文件流到客户端<br /> }<br /> }