关于高负载高并发的服务器端应用，java解决方案（二）

一，页面静态化方案

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:

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

生成HTML静态页面的类:

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

Java代码

java生成html，jsp生成html静态化（非标签化方式）

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import java.io.BufferedReader;

import java.io.File;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import org.apache.commons.io.FileUtils;

import org.apache.commons.lang.StringUtils;

/**

* @author Xing,XiuDong

public class HTMLGenerator {

public static final String generate(final String url) {

if (StringUtils.isBlank(url)) {

return null;

}

Pattern pattern = Pattern.compile("(http://|https://){1}[\\w\\.\\-/:]+");

Matcher matcher = pattern.matcher(url);

if (!matcher.find()) {

return null;

}

StringBuffer sb = new StringBuffer();

try {

URL _url = new URL(url);

URLConnection urlConnection = _url.openConnection();

BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));

String inputLine;

while ((inputLine = in.readLine()) != null) {

sb.append(inputLine);

}

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return sb.toString();

}

/**

* Test Code

* Target : http://www.google.cn/

public static void main(String[] args) throws IOException {

String src = HTMLGenerator.generate("http://www.google.cn/");

File file = new File("C:" + File.separator + "index.html");

FileUtils.writeStringToFile(file, src, "UTF-8");

}

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/**

* generite html source code

* @author Xing,XiuDong

* @date 2009.06.22

* @param request

* @param url

* @param toWebRoot

* @param encoding

* @throws IOException

public void genHtml(HttpServletRequest request, String url, boolean toWebRoot, String encoding) throws IOException {

if (null == url) {

url = request.getRequestURL().toString();

}

String contextPath = request.getContextPath();

String seq = StringUtils.substring(String.valueOf(new Date().getTime()), -6);

String ctxPath = super.getServlet().getServletContext().getRealPath(File.separator);

if (!ctxPath.endsWith(File.separator)) {

ctxPath += File.separator;

}

String filePath = StringUtils.substringAfter(url, contextPath);

filePath = filePath.replaceAll("\\.(do|jsp|html|shtml)$", ".html");

String savePath = "";

String autoCreatedDateDir = "";

if (!toWebRoot) {

savePath = StringUtils.join(new String[] { "files", "history", "" }, File.separator);

String[] folderPatterns = new String[] { "yyyy", "MM", "dd", "" };

autoCreatedDateDir = DateFormatUtils.format(new Date(), StringUtils.join(folderPatterns, File.separator));

filePath = StringUtils.substringBefore(filePath, ".html") + "-" + seq + ".html";

}

File file = new File(ctxPath + savePath + autoCreatedDateDir + filePath);

FileUtils.writeStringToFile(file, HTMLGenerator.generate(url), encoding);

}

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