JSP静态包含和动态包含的区别

Posted 2020-11-24 littemelon

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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>