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"+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()+""); 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：
<"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。
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