动态JSP页生成静态HTML的方法

Java  /  管理员 发布于 7年前   204

本文实例讲述了动态JSP页生成静态HTML的方法。分享给大家供大家参考。具体如下：

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>

希望本文所述对大家的JSP程序设计有所帮助。