行吟阁 2019-12-07
jsp动态包含和静态包含实现的内容一样,但是实现的方式不同。
jsp静态包含<%@ include file="" %>
创建include1.jsp和include2.jsp
include1.jsp代码
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ include file="include2.jsp"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Insert title here</title> </head> <body> this is include page 1 </body> </html>
include2.jsp代
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Insert title here</title> </head> <body> this is include page 2 </body> </html>
运行结果:
如果是静态包含,则只会生成一个java文件
原因:因为include1.jsp要把include2.jsp内容完全引用,所有include1.jsp会和include2.jsp合成一个jsp,然后翻译成.java文件,最后编译运行。
jsp动态包含<jsp:include page=""></jsp:include>
创建Newfile1.jsp和NewFile2.jsp
Newfile1.jsp代码
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Insert title here</title> </head> <body> <jsp:include page="/NewFile2.jsp"></jsp:include> this is newFile1 </body> </html>
Newfile2.jsp代码
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Insert title here</title> </head> <body> this is newFile2 </body> </html>
运行结果:
如果是动态包含,则会生成两个.java文件
原因是:因为是先访问NewFile1.jsp,所以先翻译成NewFile1_jsp.java,然后编译运行时发现代码,于是返回访问NewFile2.jsp,然后翻译NewFile2_jsp.java,最后编译将内容和在一起。
附上一张图便于理解:
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