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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\ r\ n);} catch (Throwablet) {if (outdated null buffer size out.getBufferSize ()!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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