标签:一个 center 为什么 r.js class color 引擎 family cal
(1)include指令
include指令告诉容器:复制被包含文件汇总的所有内容,再把它粘贴到这个文件中。
<%@ include file="Header.jsp"%>
(2)include标准动作
<jsp:include page="Header.jsp"/>
(3)采用JSTL
<c:import url="http://www.sina.com/index.html">
<%@include%>和<jsp:include>的区别,发现了一些东西的。
<%@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=" margin: 0px; padding: 0px; color: rgb(0, 0, 255);">> <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=" margin: 0px; padding: 0px; color: rgb(0, 0, 255);">> <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=" margin: 0px; padding: 0px; color: rgb(0, 0, 255);">> <%@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=" margin: 0px; padding: 0px; color: rgb(0, 0, 255);">> <%@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。
标签:一个 center 为什么 r.js class color 引擎 family cal
原文地址:http://www.cnblogs.com/ConfidentLiu/p/7682531.html