对于JSP技术实现动态页面到静态页面的方案，我们从三个步骤来说明：
JSP技术实现动态页面到静态页面的方案第一：
为了能深入浅出的理解这个框架的由来，我们首先来了解一下JSP解析器将我们写的JSP代码转换成的JAVA文件的内容。
下面是一个JSP文件test.jsp
| ﹤%@ page language=java contentType=text/html;charset=GB2312 %﹥ ﹤% out.write(﹤!--文件开始--﹥); %﹥ ﹤html﹥ ﹤head﹥ ﹤body﹥ ﹤%=输出%﹥ ﹤/body﹥ ﹤/head﹥ ﹤/html﹥ |
经过Tomcat转换出的Java文件test$jsp.java内容如下：
| package org.apache.jsp; import javax.servlet.*; import javax.servlet.http.*; import javax.servlet.jsp.*; import org.apache.jasper.runtime.*; public class test$jsp extends HttpJspBase { static { } public testOutRedir$jsp( ) { } private static boolean _jspx_inited = false; public final void _jspx_init() throws org.apache.jasper.runtime.JspException { } public void _jspService(HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, ServletException { JspFactory _jspxFactory = null; PageContext pageContext = null; HttpSession session = null; ServletContext application = null; ServletConfig config = null; JspWriter out= null; Object page = 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(); //为了节省篇幅，我删除了解释器添加的注释 out.write(\r\n); //上一句是由于 ﹤%@ page language=java contentType=text/html;charset=GB2312 %﹥后面的换行产生的 out.write(﹤!--文件开始--﹥); out.write(\r\n﹤html﹥\r\n﹤head﹥\r\n﹤body﹥\r\n); out.print(输出); out.write(\r\n﹤/body﹥\r\n﹤/head﹥\r\n﹤/html﹥\r\n); } catch (Throwable t) { if (out!= null &&out.getBufferSize() != 0) out.clearBuffer(); if (pageContext != null) pageContext.handlePageException(t); } finally { if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext); } } } |
