Dynamic JSP page generates static HTML method _jsp programming

This example describes a method for generating static HTML for dynamic JSP pages. Share to everyone for your reference. Specifically as follows:

Specific implementation:

Filter filtering function of filter to *.jsp, to determine whether there is a corresponding. html file, if there is no corresponding. html file, read out its contents to the specified. html file, and then jump to the corresponding. html. If there is a corresponding. html file, jump directly to the corresponding. html.

Code:

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 automatically generate method stubs} public void Dofilter (SERVL Etrequest request, servletresponse response, Filterchain chain) throws IOException, servletexception {HTTPSERVL
    Etrequest 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 automatically generate method stubs}}

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} Publ IC void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {R
    Esponse.setcontenttype ("text/html");
    PrintWriter out = Response.getwriter ();
    ----Get the requested URL String reqtarget = request.getparameter ("name"); ----Specifies the HTML name of the corresponding JSP String name = reqtarget.substring (reqtarget. LastIndexOf ("/") + 1,reqtarget.lastindexof ("."));
    ---to determine if there is a corresponding HTML file = filename = new file (Request.getrealpath ("/") + name + ". html");  if (!file.exists ()) {//--------if there is no corresponding HTML file try {file.createnewfile ();
        --------Create an HTML file//-------write the contents of the JSP into the corresponding HTML file InputStream in;
      StringBuffer sb = new StringBuffer ("");
        ----Note here, you cannot directly access the requested URL, if direct access, will fall into the dead loop 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 ();
      ---------------go to the HTML page response.sendredirect (Request.getcontextpath () + "/" +name + ". html") corresponding to the JSP;
      catch (Exception e) {e.printstacktrace (); }else{//----------If the specified HTML exists, jump directly to the specified HTML page response.sendredirect (Request.getcontextpath () + "/" +name + "
    . html "); } public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, Ioexce
  ption {doget (request, response);
 public void Init () throws Servletexception {//Put your code here}}

Web. XML configuration:

<?xml version= "1.0" encoding= "UTF-8"?> <web-app version=
"2.4" xmlns= "http://java.sun.com/xml/ns/"
  Java ee "
  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>

I hope this article will help you with your JSP programming.