本文實例講述了動態JSP頁生成靜態HTML的方法。分享給大家供大家參考。具體如下：
具體實現：
利用Filter的過濾功能把*.jsp過濾出來，判斷是否存在對應的.html文件，如果不存在對應的.html文件，則將其內容讀出寫入指定的.html文件，再跳轉到對應的.html即可。如果存在對應的.html文件，則直接跳轉到對應的.html即可。
代碼：
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 自動生成方法存根 } 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 自動生成方法存根 }}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(); //----獲取請求的URL String reqTarget = request.getParameter("name"); //----指定對應JSP的HTML名稱 String name = reqTarget.substring(reqTarget.lastIndexOf("/") + 1,reqTarget.lastIndexOf(".")); //---判斷是否存在對應的HTML文件 File file = new File(request.getRealPath("/") + name + ".html"); if (!file.exists()) { //--------如果不存在對應的HTML文件 try { file.createNewFile(); //--------創建HTML文件 //-------將JSP的內容寫入對應的HTML文件內 InputStream in; StringBuffer sb = new StringBuffer(""); //----注意這里，不能直接訪問請求的URL，如果直接訪問的話，會陷入死循環 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(); //---------------轉到與JSP對應的HTML頁 response.sendRedirect(request.getContextPath()+"/"+name + ".html"); } catch (Exception e) { e.printStackTrace(); } }else{ //----------如果存在指定的HTML，直接跳轉到指定的HTML頁 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>
希望本文所述對大家的JSP程序設計有所幫助。
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