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Base-Jsp-12-Jsp翻译为servlet

摘要: Base-Jsp-12-Jsp翻译为servlet

ª 事例：

<%@ page language=”java” contentType=”text/html”%>

<%@ page import=”java.util.Date”%>

<%!

Private String getGreeting()

{

Date now = new Date();

String greeting = null;

If( now.getHours()<12)

{

greeting = “Good morning”;

}

else if(now.getHours()<18)

{

gretting = “Good day”;

}

else

{

greeting = “good evening”;

}

Return greeting;

}

<head>

All Scripting Elements

</head>

<%=ge tGreeting()%>

<%if (request.g etParameter(“name”) = = null) {%>

Stranger!

<%} else {%>

Partner

<%}%>

How are you?

</body>

ª 转化后的servlet

import java.util.Date;

import javax.servlet.*;

import javax.servlet.http.*;

import javax.servlet.jsp.*;

public class allinone$jsp extends HttpJspBase

{

//声明元素原封不动的插入到了类的顶级

//声明元素中的方法没有访问JSP隐式变量的权限，如果要访问，必须作为参数传给该方法

Private String getGreeting()

{

Date now = new Date();

String greeting = null;

If( now.getHours()<12)

{

greeting = “Good morning”;

}

else if(now.getHours()<18)

{

gretting = “Good day”;

}

else

{

greeting = “good evening”;

}

return greeting;

}

public void _jspService(HttpServletRequest request,

HttpServletResponse response)

throws java.io.IOException,ServletException

{

//JSP隐含变量都是局部变量

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

{

_jspFactory = JspFactory.getDefaultFactory();

response.setContentType("text/html");

pageContext =

_jspxFactory.getPageContext(this,request,response,

"",true,8129,true);

application =pageContext.getServletContext();

config = pageContext.getServletConfig()l

session =pageContext.getSession();

out = pageContext.getOut();

out.write("\r\n");

out.write("\r\n\r\n<head>\r\n");

out.write("all scription Elements<title>\r\n"); out.write("<\head>\r\n<body bgcolor=\"white\">\r\n"); //表达式元素也原封不动的插入，所以不应该在JSP表达式末尾使用分号的原因 out.print(getGreeting()); out.write("\r\n"); if(request.getParameter("name") ==null) { out.write("\r\n stranger! \r\n"); } else { out.write("\r\n partner! \r\n"); } out.write("\r\n How are you? \r\n"); out.write("</body>\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); } }} <div style="font-size: 14px; line-height: 25px;"> <a href="/jsp/index.html">↑返回目录</a> 前一篇: <a href='/jsp/1/4366.html'>Base-Jsp-13-缓冲和页面片断引入 </a> 后一篇: <a href='/jsp/1/4368.html'>Base-Jsp-11-使用脚本元素 </a> </div>    <div id=footer><center> <a href="http://www.javanb.com/index.html">首页</a> | <a href="http://www.javanb.com/java-sitemap-bd.html">全站 Sitemap</a> | <a href="http://www.javanb.com/contact.html">联系我们</a> | <a href="#" onclick="this.style.behavior='url(#default#homepage)';this.setHomePage('http://www.javanb.com/');return(false);">设为首页</a> | <a href="#" onclick="window.external.AddFavorite('http://www.javanb.com/', 'Java 编程资料牛鼻站');return false;">收藏本站</a> 版权所有 Copyright © 2006-2007, Java 编程资料牛鼻站, All rights reserved </center></div>  </div> </body></html>