How to realize dynamic page to static page with JSP technology

This article is about how JSP technology enables dynamic pages to static pages. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The solution of JSP technology to realize dynamic page to static page is first:

In order to understand the origin of this framework, let's first take a look at the contents of the JAVA file that the JSP parser converts the JSP code we wrote into.

Here is a JSP file, test.jsp

<% @ pagelanguage=javacontentType=text/html;charset=GB2312% > <% out.write () % > < html > < head > < body > <% = output% > < / body > < / head > < / html > the test$jsp.java content of the Java file converted by Tomcat is as follows: packageorg.apache.jsp; importjavax.servlet.*; importjavax.servlet.http.*; importjavax.servlet.jsp.*; importorg.apache.jasper.runtime.* Publicclasstest$jspextendsHttpJspBase {static {} publictestOutRedir$jsp () {}

How to realize dynamic page to static page with JSP technology

Privatestaticboolean_jspx_inited=false; publicfinalvoid_jspx_init () throwsorg.apache.jasper.runtime.JspException {} publicvoid_jspService (HttpServletRequestrequest,HttpServletResponseresponse) throwsjava.io.IOException,ServletException {JspFactory_jspxFactory=null; PageContextpageContext=null; HttpSessionsession=null; ServletContextapplication=null; ServletConfigconfig=null; JspWriterout=null; Objectpage=this; String_value=null; try {if (_ jspx_inited==false) {synchronized (this) {if (_ jspx_inited==false) {_ jspx_init () _ jspx_inited=true;} _ jspxFactory=JspFactory.getDefaultFactory (); response.setContentType (text/html;charset=GB2312); pageContext=_jspxFactory.getPageContext (this,request,response, true,8192,true); application=pageContext.getServletContext (); config=pageContext.getServletConfig (); session=pageContext.getSession (); out=pageContext.getOut (); / / to save space, I removed the comment out.write (\ r\ n) added by the interpreter / / the previous sentence is an out.write (. -- start of the file-- >); out.write (\ r\ n < html >\ r\ n < head >\ r\ n < body >\ r\ n); out.print (output); out.write (\ r\ n < / body >\ r\ n < / head >\ n < / html >\ r\ n);} catch (Throwablet) {if (outdated null buffer size out.getBufferSize ()! = 0) out.clearBuffer () If (pageContextdisabled null) pageContext.handlePageException (t);} finally {if (_ jspxFactoryinvalid null) _ jspxFactory.releasePageContext (pageContext);}

From the above code, you can clearly see how several built-in objects in JSP (out, request, response, session, pageContext, application, config, page) are generated, which can be understood by friends who understand servlet.

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