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); } } }
从上面的代码中可以清晰的看到JSP内建的几个对象（out、request、response、session、pageContext、application、config、page）是怎么产生的，懂servlet的朋友一看就能明白。
下面重点理解一下out对象，它被声明为JspWriter类型，JspWriter是一个抽象类，在包javax.servlet.jsp中可以找到它的定义。
abstractpublicclassjavax.servlet.jsp.JspWriterextends java.io.Writer{ final public static intNO_BUFFER = 0; final public static intDEFAULT_BUFFER = -1; final public static intUNBOUNDED_BUFFER = -2; protected intbufferSize; protected BooleanautoFlush; protectedjavax.servlet.jsp.JspWriter(intarg1,booleanarg2); abstractpublicvoidnewLine()throwsIOException; abstractpublicvoidprint(booleanarg0)throwsIOException; abstractpublicvoidprint(chararg0)throwsIOException; abstractpublicvoidprint(intarg0)throwsIOException; abstractpublicvoidprint(longarg0)throwsIOException; abstractpublicvoidprint(floatarg0)throwsIOException; abstractpublicvoidprint(doublearg0)throwsIOException; abstractpublicvoidprint(char[]arg0)throwsIOException; abstractpublicvoidprint(Stringarg0)throwsIOException; abstractpublicvoidprint(Objectarg0)throwsIOException; abstractpublicvoidprintln()throwsIOException; abstractpublicvoidprintln(booleanarg0)throwsIOException; abstractpublicvoidprintln(chararg0)throwsIOException; abstractpublicvoidprintln(intarg0)throwsIOException; abstractpublicvoidprintln(longarg0)throwsIOException; abstractpublicvoidprintln(floatarg0)throwsIOException; abstractpublicvoidprintln(doublearg0)throwsIOException; abstractpublicvoidprintln(char[]arg0)throwsIOException; abstractpublicvoidprintln(Stringarg0)throwsIOException; abtractpublicvoidprintln(Objectarg0)throwsIOException; abstractpublicvoidclear()throwsIOException; abstractpublicvoidclearBuffer()throwsIOException; abstractpublicvoidflush()throwsIOException; abstractpublicvoidclose()throwsIOException; publicintgetBufferSize() ; abstractpublicintgetRemaining(); publicbooleanisAutoFlush(); }
相信到这里你可能已经知道怎么做了。是的，来个偷天换日，继承JspWriter类，然后实现其定义的虚函数，然后把out变量替换成你自己实现的类的实例就ok了。
JSP技术实现动态页面到静态页面的方案第二：
实现替换
假设
﹤%@ page language=java contentType=text/html;charset=GB2312 import=jwb.util.HtmlIntoFile,jwb.util.TempSinglet,java.io.File%﹥ ﹤% JspWriter outout_bak =out;String arg1=argument1;String filePath = /cache/根据参数生成文件名_ + arg1 + .html; //首先判断文件是否已经存在，如果不存在则执行本页面，否则跳转到静态页面就OK了File f = new File(pageContext.getServletContext().getRealPath(filePath)); if(f.exists()){ out_bak.clear(); pageContext.forward(filePath); System.out.println(直接转到静态页面); return;}out= new HtmlIntoFile(pageContext.getServletContext().getRealPath(filePath));out.write(﹤!--文件开始--﹥); %﹥ ﹤html﹥ ﹤head﹥ ﹤body﹥ ﹤%= 看吧，这就是输出被重定向到文件的实现，很简单吧^_^%﹥ ﹤/body﹥ ﹤/head﹥ ﹤/html﹥ ﹤% out.close(); //关闭生成的静态文件out_bak.clear();pageContext.forward(filePath); System.out.println(执行本页面后再转到静态页面);return; %﹥
JSP技术实现动态页面到静态页面的方案第三：
更新问题