求教：<c:forEach 里面内容不能显示，搞了一晚上了

Question

把<jsp:useBean id="users" class="com.demo.data.UserBean" ></jsp:useBean>去掉或者把id换个名字

Answer 1

<c:forEach items="${users.objectList}" var="entity" > 
你试试这个

Answer 2

加了这个 运行出错 提示 javax.el.PropertyNotFoundException: Property 'objectList' not found on type com.demo.data.UserBean
javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:266)
javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:243)
javax.el.BeanELResolver.property(BeanELResolver.java:353)
javax.el.BeanELResolver.getValue(BeanELResolver.java:97)
org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
org.apache.el.parser.AstValue.getValue(AstValue.java:183)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:967)
org.apache.jsp.WebRoot.main_jsp._jspService(main_jsp.java:108)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.demo.handler.impl.LoginHandler.process(LoginHandler.java:39)
com.demo.logic.LogicBase.doPost(LogicBase.java:47)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Answer 3

加了这个 运行出错 提示 javax.el.PropertyNotFoundException: Property 'objectList' not found on type com.demo.data.UserBean
javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:266)
javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:243)
javax.el.BeanELResolver.property(BeanELResolver.java:353)
javax.el.BeanELResolver.getValue(BeanELResolver.java:97)
org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
org.apache.el.parser.AstValue.getValue(AstValue.java:183)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:967)
org.apache.jsp.WebRoot.main_jsp._jspService(main_jsp.java:108)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.demo.handler.impl.LoginHandler.process(LoginHandler.java:39)
com.demo.logic.LogicBase.doPost(LogicBase.java:47)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
那我也不知道了

Answer 4

加了这个 运行出错 提示 javax.el.PropertyNotFoundException: Property 'objectList' not found on type com.demo.data.UserBean
javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:266)
javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:243)
javax.el.BeanELResolver.property(BeanELResolver.java:353)
javax.el.BeanELResolver.getValue(BeanELResolver.java:97)
org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
org.apache.el.parser.AstValue.getValue(AstValue.java:183)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:967)
org.apache.jsp.WebRoot.main_jsp._jspService(main_jsp.java:108)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.demo.handler.impl.LoginHandler.process(LoginHandler.java:39)
com.demo.logic.LogicBase.doPost(LogicBase.java:47)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
那我也不知道了还是谢谢各位啊 郁闷死我了 

Answer 5

没用这样这个这边肯定不应该这么写的，底面c:foreach的标签没有问题，如果还是不行，你可以直接用
<%request.getAttribute（），然后循环%>

Answer 6

这句后面加上.forward(request,response)试试
req.getRequestDispatcher("/WebRoot/main.jsp").forward(request,response);

Answer 7

 没赋值呗，rs 是啥 rs.getString(2/3) 有值吗

Answer 8

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
jsp中加这个没有

Answer 9

没用这样这个这边肯定不应该这么写的，底面c:foreach的标签没有问题，如果还是不行，你可以直接用
<%request.getAttribute（），然后循环%>恩好的 问题有些多 我是新手 搞来搞去 解决了 谢谢你 

Answer 10

明显是 <tr> 前面没加<table> 标签嘛