动态JSP页怎么生成静态HTML

作者:kgmucom   在线用户:9
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我们在网站项目中为了提高网站访问速度我们都会吧的页面变成,那么你知道动态JSP页怎么生成静态HTML吗?下面我们就去看看动态JSP页生成静态HTML的方法。

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:

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.net.HttpURLConnection;
import java.net.URL;
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:

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.beanutil.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.beanutil.ConversionServlet </servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>conversion</servlet-name>
  <url-pattern>/conversion</url-pattern>
 </servlet-mapping>
</web-app>

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