jsp的<%@ include file="jsp/common.jsp" %>报错误Duplicate local variable basePath

将公共引入的文件放到common.jsp中，其他页面引入该jsp即可使用

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3     String path = request.getContextPath();
 4     String basePath = request.getScheme() + "://"
 5             + request.getServerName() + ":" + request.getServerPort()
 6             + path + "/";
 7 %>
 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 9 <html>
10 <head>
11 <base href="<%=basePath%>">
12 <%@ include file="jsp/common.jsp" %>
13 <title>My JSP ‘index.jsp‘ starting page</title>
14 </head>

此时报：Duplicate local variable basePath

　　因为<%@ include file="jsp/common.jsp" %>是讲file指定的页面代码完全放入到你的页面中，这样，相当于声明了两次

<base href="<%=basePath%>">，所以报了重复的错误。

　　分析：<%@ include file="" %>和<jsp:include page=""></jsp:include>区别与分析

　　<%@ include file="" %>是将文件原封不动的copy进现有的文件中，像是拼接好后，再编译成为servlet运行。

　　<jsp:include page=""></jsp:include>是编译后的servlet运行到该句时，跳转到指定的jsp编译的那个servlet继续运行，然后将运行结果，copy到现在的jsp中，故包含与被包含文件都是单独运行的。

　　解决办法：为了达到目的，我们可以在一个jsp文件中，只声明要使用的文件的引入，而不需要指定base等，如下：

<script type="text/javascript" src="js/alert.js" charset="UTF-8"></script>
<script type="text/javascript" src="js/jquery-easyui-1.4.1/jquery.easyui.min.js" charset="UTF-8"></script>
<script type="text/javascript" src="js/jquery-easyui-1.4.1/jquery.min.js" charset="UTF-8"></script>
<script type="text/javascript" src="js/jquery-easyui-1.4.1/locale/easyui-lang-zh_CN.js" charset="UTF-8"></script>
<link rel="stylesheet" href="js/jquery-easyui-1.4.1/themes/icon.css" type="text/css" charset="UTF-8"></link>
<link rel="stylesheet" href="js/jquery-easyui-1.4.1/themes/color.css" type="text/css" charset="UTF-8"></link>
<link rel="stylesheet" href="js/jquery-easyui-1.4.1/themes/default/easyui.css" type="text/css" charset="UTF-8"></link>

其中js和css文件均以webapp为根指定相应的引用地址。

　　此时在在index.jsp中可以使用<%@ include file="jsp/common.jsp" %>即可解决问题

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<%@ include file="jsp/common.jsp" %>
<title>My JSP ‘index.jsp‘ starting page</title>
</head>

时间： 2024-12-26 16:24:21

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