jsp 页面静态化 java.net.MalformedURLException: no protocol: index.jsp和java.net.MalformedURLException: unknown protocol: d
一般情况下,应用程序首页（default.jsp）, 要显示来自于数据库的大量数据,每次用户来访问这个页面的时候,会花掉大量的时间, 所以我们可能用一个servlet,每次服务器启动的时候,读出default.jsp页面中的内容,生成一个静态的页面index.html ,将首页设制为index.html,这样就减少了用户访问首页的时间.
package com.newer.servlet; import java.io.BufferedReader; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class LoginServlet extends HttpServlet { public LoginServlet() { super(); } public void destroy() { super.destroy(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out .println("<!DOCTYPE HTML PUBLIC /"-//W3C//DTD HTML 4.01 Transitional//EN/">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This is "); out.print(this.getClass()); out.println(", using the POST method"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } public void init() throws ServletException { System.out.println("页面静态化"); String path = this.getServletContext().getRealPath("/"); ThreadStatic ts = new ThreadStatic(path); ts.start(); } } /** * 该类用于静态化页面 * @author Administrator * */ class ThreadStatic extends Thread{ private String path; public ThreadStatic(){ } public ThreadStatic(String path){ this.path = path; } @Override public void run() { try { Thread.sleep(10000);//睡眠10秒 URL url = new URL("http://localhost:8088/prj/index.jsp"); URLConnection conn = url.openConnection();//打开连接 InputStream is = conn.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(is));//转换字符流 FileWriter fw = new FileWriter(path + "default.html"); PrintWriter out = new PrintWriter(fw,true); String line = ""; while((line = br.readLine()) != null){ out.println(line); } System.out.println("静态化完毕..."); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
对于页面静态化时出现的错误
java.net.MalformedURLException: unknown protocol: d
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at com.newer.servlet.ThreadStatic.run(LoginServlet.java:80)
这个可能就是URL url = new URL("http://localhost:8088/prj/index.jsp");地址写得不对
java.net.MalformedURLException: no protocol: index.jsp
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at com.newer.servlet.ThreadStatic.run(LoginServlet.java:80)
针对这个错误,可能URL的地址找不到,因为你的servlet还没实列化完成
当然我这里采用里多线程来处理的,Thread.sleep(10000);线程睡眠10秒,等待servlet实列化完成
这样就不会出现,找不到对应的要静态化的页面了