运行结果不一致
相关代码：
package com.imooc.jstl;
public class Company {
private String cname;
private String url;
public Company(String cname,String url) {
this.cname=cname;
this.url=url;
}
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
相关代码：
package com.imooc.jstl;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
/**
* Servlet implementation class JstlServlet
*/
@WebServlet("/jstl")
public class JstlServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public JstlServlet() {
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setAttribute("score",75);
request.setAttribute("grade", "B");
List list=new ArrayList();
list.add(new Company("腾讯","www.tencent.com"));
list.add(new Company("百度","www.baidu.com"));
list.add(new Company("慕课网","www.imooc.com"));
request.setAttribute("companies",list);
request.getRequestDispatcher("/core.jsp").forward(request, response);
}
}
相关代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>${requestScope.score}</h1>
<c:if test="${score>=60}">
<h1 style="color:green">恭喜，您已通过测试</h1>
</c:if>
<c:if test="${score<60}">
<h1 style="color:yellow">对不起，再接再厉</h1>
</c:if>
${grade }
<c:choose>
<c:when test="${grade=='A'}">
<h2>你狠优秀</h2>
</c:when>
<c:when test="${grade=='B'}">
<h2>不错哦</h2>
</c:when>
<c:when test="${grade=='C'}">
<h2>水平一般，需要提高</h2>
</c:when>
<c:when test="${grade=='D'}">
<h2>需要努力啦，不要气馁</h2>
</c:when>
<c:otherwise>
<h2>一切随缘吧</h2>
</c:otherwise>
</c:choose>
<!--forEach标签用于遍历集合
List companies=(List)request.getAttribute("companies");
for(Company c:companies){
out print(...); }
-->
<c:forEach items = "${requestScope.companies}" var = "c" varStatus = "idx">
<h2 style="color:red">${idx.index+1}.${c.cname}-${c.url}</h2>
</c:forEach>
</body>
</html>
相关截图：
问题描述：
老师好，为什么到了集合这边代码都没有显示了，这是什么问题啊
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