jstl出错无法识别

Question

java.lang.NumberFormatException: For input string: "${}"
网上查了 一下 说是 少了<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>这段话 
我明明都加上了 还是错

Answer 1

你用的是jstl 的fmt标签
应该加上<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>

Answer 2

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
我都加上了

Answer 3

tld 文件怎么加啊 我新人。。

Answer 4

java.lang.ClassNotFoundException: org.apache.jsp.WEB_002dINF.page.product.producttypelist_jsp

Answer 5

有没有这个异常，有了就是包没导入
tld在下载的包里有

Answer 6

jstl.jar，standard.jar 这两个包我导入了啊，tld都加进去了 还是那样 
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %> 
页面里我也都加进去了

Answer 7

exceptionorg.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:396)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)root causeorg.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:598)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:147)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:396)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)root causejava.lang.ClassNotFoundException: org.apache.jsp.WEB_002dINF.page.product.producttypelist_jsp
-----------------------------------------------------------------------------------------------
exceptionorg.apache.jasper.JasperException: Unable to compile class for JSP
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:396)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)root causeorg.apache.jasper.JasperException: Unable to compile class for JSP
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:572)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:305)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:396)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)root causejava.lang.NumberFormatException: For input string: "${pageView.pageindex.startindex}"
------------------------------------------------------------------------------------------
两个异常交替报的。。-。-

Answer 8

 报告的不是数字转换异常吗？
应该是参数有问题吧，可能要转换成数字的string不能转换吧

Answer 9

看看<c:out value="${pageView.pageindex.startindex}"/>是不是正确如果没问题的话，就是fmt使用不对了

Answer 10

试了<c:out value="${pageView.pageindex.startindex}"/>
还是那样，还是那两个错误

Answer 11

建议这样写 <%@ taglib uri="/WEB-INF/*.tld" prefix="c" %>
需要把*换成你的实际路径
这样写应该没有问题

Answer 12

还是不行 是不是jstl1.1  跟struts1.3 或 spring2.5 哪个包冲突啊 

Answer 13

<%@ page isELIgnored="false"%>加上这个试下

Answer 14

崩溃了
<%@ page language="java" contentType="text/html; charset=UTF-8" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="/WEB-INF/c.tld" prefix="c" %>
<%@ taglib uri="/WEB-INF/fmt.tld" prefix="fmt" %>
<%@ taglib uri="/WEB-INF/fn.tld"   prefix="fn" %><html>
<head>
<title>producttypelist</title>
</head> <body>
<c:out value="${pageView.pageindex.startindex}"/> 
</body>
</html>
这个代码
我得到了
${pageView.pageindex.startindex} 

Answer 15

<%@ page language="java" contentType="text/html; charset=UTF-8"; isELIgnored="false"%> 试下了

Answer 16

里面的数据我都能在控制台打出来的，就是到页面就错了。
<%@ page language="java" contentType="text/html; charset=UTF-8"; isELIgnored="false"%> 
这个也试了  还是
${pageView.pageindex.startindex} 

Answer 17

终于找到原因了，原来真是我把EL禁掉了，这样我每个页面都要写
<%@ page language="java" contentType="text/html; charset=UTF-8"; isELIgnored="false"%> 
这段话了啊
有没什么办法不要写 isELIgnored="false" 这个语句