jsp 转成静态html

最新推荐文章于 2020-12-02 06:10:07 发布

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#HTML #JSP #Servlet #Java #.net

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本文介绍了一个使用Java Servlet过滤器实现的JSP页面自动转换为HTML的技术方案。该方案通过自定义过滤器拦截所有JSP请求，在不改变现有应用程序的情况下，将JSP动态页面转换并保存为静态HTML文件，从而提升网页加载速度。

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package com.servlet;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class JspFilter implements Filter {

    public void destroy() {

        // TODO 自动生成方法存根

    }

    public void doFilter(ServletRequest request, ServletResponse response,

            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest hreq = (HttpServletRequest) request;

        HttpServletResponse hresp = (HttpServletResponse) response;

        //String name = hreq.getRequestURL().substring(hreq.getRequestURL().lastIndexOf("/") + 1, hreq.getRequestURL().lastIndexOf("."));

        if (hreq.getRequestURL().indexOf(".jsp") != -1 && (null == hreq.getParameter("type") || hreq.getParameter("type").equals(""))) {            

                hresp.sendRedirect(hreq.getContextPath()+"/conversion?name="+hreq.getRequestURL());
                return ;

        }

        chain.doFilter(request, response);

    }

    public void init(FilterConfig arg0) throws ServletException {

        // TODO 自动生成方法存根

    }

}

ConversionServlet .java

package com.servlet;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.HttpURLConnection;

import java.net.URL;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ConversionServlet extends HttpServlet {

    public ConversionServlet () {

        super();

    }

    public void destroy() {

        super.destroy(); // Just puts "destroy" string in log

        // Put your code here

    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();

        //----获取请求的URL

        String reqTarget = request.getParameter("name");

        //----指定对应JSP的HTML名称

        String name = reqTarget.substring(reqTarget.lastIndexOf("/") + 1,reqTarget.lastIndexOf("."));

        //---判断是否存在对应的HTML文件

        File file = new File(request.getRealPath("/") + name + ".html");



        if (!file.exists()) {   //--------如果不存在对应的HTML文件

            try {



                file.createNewFile();   //--------创建HTML文件

                //-------将JSP的内容写入对应的HTML文件内

                InputStream in;

                StringBuffer sb = new StringBuffer("");

            //----注意这里，不能直接访问请求的URL，如果直接访问的话，会陷入死循环

                URL url = new java.net.URL(reqTarget.toString()+"?type=11");

                HttpURLConnection connection = (HttpURLConnection) url

                        .openConnection();

                connection.setRequestProperty("User-Agent", "Mozilla/4.0");

                connection.connect();

                in = connection.getInputStream();

                java.io.BufferedReader breader = new BufferedReader(

                        new InputStreamReader(in, "GBK"));

                String currentLine;

                FileOutputStream fos = new FileOutputStream(file);

                while ((currentLine = breader.readLine()) != null) {

                    sb.append(currentLine);

                    fos.write(currentLine.getBytes());

                }

                if (null != breader)

                    breader.close();

                if (null != fos)

                    fos.close();

                //---------------转到与JSP对应的HTML页

                response.sendRedirect(request.getContextPath()+"/"+name + ".html");

            } catch (Exception e) {

                e.printStackTrace();

            }

        }else{

            //----------如果存在指定的HTML，直接跳转到指定的HTML页

            response.sendRedirect(request.getContextPath()+"/"+name + ".html");

        }

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        doGet(request, response);

    }

    public void init() throws ServletException {

        // Put your code here

    }

}

web.xml

   <servlet>
    <servlet-name>ChangeHtml</servlet-name>
    <servlet-class>com.servlet.ChangeHtml</servlet-class>
      </servlet>
  <servlet-mapping>
    <servlet-name>ChangeHtml</servlet-name>
    <url-pattern>/changeHtml</url-pattern>
  </servlet-mapping>
   <filter>
    <filter-name>jspfilter</filter-name>
    <filter-class>com.servlet.JspFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>jspfilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
  </filter-mapping>
  <servlet>
    <servlet-name>conversion</servlet-name>
    <servlet-class>com.servlet.ConversionServlet </servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>conversion</servlet-name>
    <url-pattern>/conversion</url-pattern>
  </servlet-mapping>