jsp转html静态化（一）常规处理方式

具体实现：

利用Filter的过滤功能把*.jsp过滤出来，判断是否存在对应的.html文件，如果不存在对应的.html文件，则将其内容读出写入指定的.html文件，再跳转到对应的.html即可。如果存在对应的.html文件，则直接跳转到对应的.html即可。

 

代码：

JspFilter.java

 

package com.zh.jsp.filter;

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;

/**
 * @name
 * @author zhanghao
 * @create date Nov 1, 2011
 */
public class JspFilter implements Filter {

 @Override
 public void destroy() {
  // TODO Auto-generated method stub

 }

 @Override
 public void doFilter(ServletRequest req, ServletResponse resp,
   FilterChain chain) throws IOException, ServletException {
  HttpServletRequest request = (HttpServletRequest) req;
  HttpServletResponse response = (HttpServletResponse) resp;
  System.out.println("访问的url：：：" + request.getRequestURL());
  String name = request.getRequestURL().substring(
    request.getRequestURL().lastIndexOf("/") + 1,
    request.getRequestURL().lastIndexOf("."));

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

   response.sendRedirect(request.getContextPath()
     + "/conversion?name=" + request.getRequestURL());

   return;

  }

  chain.doFilter(request, response);

 }
 @Override
 public void init(FilterConfig filterConfig) throws ServletException {
  // TODO Auto-generated method stub

 }

}

 

 

 

ConversionServlet.java

 

package com.zh.jsp.filter;

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

/**
 * @name
 * @author zhanghao
 * @create date Nov 1, 2011
 */
public class ConversionServlet extends HttpServlet {

 protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
  //设置输出格式
  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  //获取请求的URL
  String requestUrl = request.getParameter("name");
  //指定对应JSP的HTML名称
  String name = requestUrl.substring(requestUrl.lastIndexOf("/") + 1,requestUrl.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 {
     //创建HTML文件
    file.createNewFile();
    //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(requestUrl.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, "UTF-8"));
    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");
  }
 }

 @Override
 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {
  // TODO Auto-generated method stub
  super.doGet(req, resp);
 }

 @Override
 public void destroy() {
  // TODO Auto-generated method stub
  super.destroy();
 }

 @Override
 public void init(ServletConfig config) throws ServletException {
  // TODO Auto-generated method stub
  super.init(config);
 }

}

 

 

WEB.XML配置：

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4"

xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<filter>
  <filter-name>jspfilter</filter-name>
  <filter-class>com.zh.jsp.filter.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.zh.jsp.filter.ConversionServlet
  </servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>conversion</servlet-name>
  <url-pattern>/conversion</url-pattern>
 </servlet-mapping>

</web-app>