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:

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:

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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