http://www.jb51.net/article/43304.htm
动态INCLUDE
用法:<jsp:include page="included.jsp" flush="true" /> 说明:它总是会检查所含文件中的变化,适合用于包含动态页面,并且可以带参数,先编译之后再进行处理。 原因:1、静态include的结果是把其他jsp引入当前jsp,两者合为一体。 2、静态include纯粹是把代码写在外面的一种共享方法,所有的变量都是可以和include它的主文件共享,两者高度紧密结合,不能有变量同名的冲突.而页面设置也可以借用主文件的. 静态INCLUDE 用法:<%@ include file="included.htm" %> 说明:用include伪码实现,不会检查所含文件的变化,适用于包含静态页面,直接将内容先包含后处理。 原因:1、动态include的结构是两者独立,直到输出时才合并( 看看jsp生成的java文件就可以知道了)。 2、动态include的jsp文件独立性很强,是一个单独的jsp文件,需要使用的对象,页面设置,都必须有自己创建,当然,还好它和include它的页面的request范围是一致的。
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http://blog.csdn.net/yangbobo1992/article/details/8085667
<%@include%>:页面请求之前预编译,所有代码包含进来之后,一起进行处理,把所有代码合在一起,编译成一个servlet
<jsp:include>:所有代码分别处理,在页面被请求的时候才编译,被编译成多个servlet,页面语法相对独立,处理完成之后再将代码的显示结果(处理结果)组合进来。
JSP中的两种包含页面的方法第一种:include指令:当JSP转换成Servlet时引入指定文件
<%@ pagecontentType="text/html;charset=GB2312" language="Java"errorPage=""%><%@ include file="head.jsp"%><%@ include file="body.jsp"%><%@ include file="tail.jsp"%>第二种:<jsp:include>动作元素:当JSP页面被请求时引入指定文件<%@ page contentType="text/html; charset=GB2312"language="java" errorPage=""%><jsp:include page="head.jsp"/><jsp:include page="body.jsp"/><jsp:include page="tail.jsp"/>第二种方法可以很方便的用<jsp:param>来向所包含页传递参数,方法如下:<%@ page contentType="text/html; charset=GB2312"language="java" errorPage=""%><jsp:include page="head.jsp"/><jsp:includepage="body.jsp"><jsp:param name="uid"value="username"/><jsp:param name="pwd"value="passWord"/></jsp:include><jsp:includepage="tail.jsp"/>
<jsp:include> :动态包含
第一种情况(<jsp:include>包含的是html文件):
DynamicInclude.jsp:
<%@pagecontentType="text/html;charset=gb2312"%><html> <head> <title>动态包含</title> </head> <bodystyle="background-color:lightblue"> <jsp:include page="header.html"flush="true"/><!--动态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body></html>
Header.html :
<h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 动态包含的标题(HTML)</h2>
运行之后,只生成一个servlet,和上面的代码对应如下:
out.write("/r/n"); out.write("<html>/r/n"); out.write("/t<head>/r/n"); out.write("/t/t<title>动态包含</title>/r/n"); out.write("/t</head>/r/n"); out.write("/t<bodystyle=/"background-color:lightblue/">/r/n"); out.write("/r/n"); out.write("/t/t"); <span style="color:#ff0000;">org.apache.jasper.runtime.JsPRuntimeLibrary.include(request,response, "header.html", out, true);</span> out.write("<!--动态包含-->/r/n"); out.write("/r/n"); out.write("/t/t<table border=/"1/"align=/"center/">/r/n"); out.write("/t/t/t<tr>/r/n"); out.write("/t/t/t/t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>/r/n"); out.write("/t/t/t</tr>/r/n"); out.write("/t/t/t<tr>/r/n"); out.write("/t/t/t/t<td>a</td><td>b</td><td>c</td><td>d</td>/r/n"); out.write("/t/t/t</tr>/r/n"); out.write("/t/t</table>/r/n"); out.write("/t</body>/r/n"); out.write("</html>");
第二种情况(<jsp:include>包含的是jsp文件):
DynamicInclude.jsp:
<%@pagecontentType="text/html;charset=gb2312"%><html> <head> <title>动态包含</title> </head> <bodystyle="background-color:lightblue"> <jsp:include page="header.jsp"flush="true"/><!--动态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body></html>Header.jsp :
<%@pagecontentType="text/html;charset=gb2312"%><html> <body> <h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 动态包含的标题(JSP) </h2> </body></html>运行之后,生成了两个servlet:DynamicInclude_jsp.java和header_jsp.java,这也是为什么 Header.jsp中要写上<%@page contentType="text/html;charset=gb2312"%>和完整的<html></html>和<body></body>,而Header.html不用写的原因。因为前者两个.jsp文件是两个相互独立的整体,它们之间的关系是通过request和reponse来发生的,而后者只是简单的嵌套。两个servlet对应的代码如下:
DynamicInclude_jsp.java:
out.write("/r/n"); out.write("<html>/r/n"); out.write("/t<head>/r/n"); out.write("/t/t<title>动态包含</title>/r/n"); out.write("/t</head>/r/n"); out.write("/t<bodystyle=/"background-color:lightblue/">/r/n"); out.write("/r/n"); out.write("/t/t"); <span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.jsp", out, true);</span> out.write("<!--动态包含-->/r/n"); out.write("/r/n"); out.write("/t/t<table border=/"1/"align=/"center/">/r/n"); out.write("/t/t/t<tr>/r/n"); out.write("/t/t/t/t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>/r/n"); out.write("/t/t/t</tr>/r/n"); out.write("/t/t/t<tr>/r/n"); out.write("/t/t/t/t<td>a</td><td>b</td><td>c</td><td>d</td>/r/n"); out.write("/t/t/t</tr>/r/n"); out.write("/t/t</table>/r/n"); out.write("/t</body>/r/n"); out.write("</html>");header_jsp.java:
out.write("/r/n"); out.write("<html>/r/n"); out.write("/t<body>/r/n"); out.write("/t/t<h2 style=/"font-family:arial;color:red;font-size:25px;text-align:center/">/r/n"); out.write("/t/t/t动态包含的标题(JSP)/r/n"); out.write("/t/t</h2>/r/n"); out.write("/t</body>/r/n"); out.write("</html>");
<%@include%>:静态包含
第一种情况:<%@include%>包含的是jsp文件。
StaticInclude.jsp:
<%@pagecontentType="text/html;charset=gb2312"%><html> <head> <title>静态包含</title> </head> <bodystyle="background-color:lightblue"> <%@include file="header.jsp"%><!--静态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body></html>header.jsp:
<%@pagecontentType="text/html;charset=gb2312"%><h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 静态包含的标题(JSP)</h2>
运行之后,只生成一个servlet,和上面的代码对应如下:
out.write("/r/n"); out.write("<html>/r/n"); out.write("/t<head>/r/n"); out.write("/t/t<title>静态包含</title>/r/n"); out.write("/t</head>/r/n"); out.write("/t<body style=/"background-color:lightblue/">/r/n"); out.write("/r/n"); out.write("/t/t"); out.write("/r/n"); <span style="color:#ff0000;">out.write("<h2style=/"font-family:arial;color:red;font-size:25px;text-align:center/">/r/n"); out.write("/t静态包含的标题(JSP)/r/n"); out.write("</h2>");</span> out.write("<!--静态包含-->/r/n"); out.write("/t/t<table border=/"1/"align=/"center/">/r/n"); out.write("/t/t/t<tr>/r/n"); out.write("/t/t/t/t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>/r/n"); out.write("/t/t/t</tr>/r/n"); out.write("/t/t/t<tr>/r/n"); out.write("/t/t/t/t<td>a</td><td>b</td><td>c</td><td>d</td>/r/n"); out.write("/t/t/t</tr>/r/n"); out.write("/t/t</table>/r/n"); out.write("/t</body>/r/n"); out.write("</html>");
第二种情况:<%@include%>包含的是html文件。
StaticInclude.jsp:
<%@pagecontentType="text/html;charset=gb2312"%><html> <head> <title>静态包含</title> </head> <bodystyle="background-color:lightblue"> <%@include file="header.html"%><!--静态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body></html>header.html:
<%@pagecontentType="text/html;charset=gb2312"%><h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 静态包含的标题(HTML)</h2>运行之后,也是只生成一个servlet,和上面的代码对应如下:
out.write("/r/n"); out.write("<html>/r/n"); out.write("/t<head>/r/n"); out.write("/t/t<title>静态包含</title>/r/n"); out.write("/t</head>/r/n"); out.write("/t<bodystyle=/"background-color:lightblue/">/r/n"); out.write("/r/n"); out.write("/t/t"); out.write("/r/n"); <span style="color:#ff0000;">out.write("<h2style=/"font-family:arial;color:red;font-size:25px;text-align:center/">/r/n"); out.write("/t静态包含的标题(HTML)/r/n"); out.write("</h2>");</span> out.write("<!--静态包含-->/r/n"); out.write("/t/t<table border=/"1/"align=/"center/">/r/n"); out.write("/t/t/t<tr>/r/n"); out.write("/t/t/t/t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>/r/n"); out.write("/t/t/t</tr>/r/n"); out.write("/t/t/t<tr>/r/n"); out.write("/t/t/t/t<td>a</td><td>b</td><td>c</td><td>d</td>/r/n"); out.write("/t/t/t</tr>/r/n"); out.write("/t/t</table>/r/n"); out.write("/t</body>/r/n"); out.write("</html>");
由上可以总结出:
对于静态包含,<%@include%>,中包含的文件,只是简单的嵌入到主文件中,就是在jsp页面转化成Servlet时才嵌入到主文件中,因为运行的结果是只生成了一个Servlet。
而对于动态包含<jsp:incude>,如果被包含文件是动态的,那么就会生成两个Servlet,也就是被包含文件也要经过jsp引擎编译执行生成一个Servlet,两个Servlet通过request和reponse进行通信。如果被包含的文件是静态的,那么这种情况和<%@include>就很相似,只生成了一个Servlet,但是他们之间没有进行简单的嵌入,而依然是通过request和reponse进行的通信。
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