老师看一下哪里错了?为什么打印不出来?
来源:2-13 自由编程
一心励志当码农
2019-10-21 21:25:32
package com.imooc.jstl; public class Notice { private String id; private String name; public Notice(String id,String name) { this.id=id; this.name=name; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "Notice [id=" + id + ", name=" + name + "]"; } }
package com.imooc.jstl; import java.io.IOException; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class NoticeServlet */ @WebServlet("/ns") public class NoticeServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public NoticeServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List list=new ArrayList(); list.add(new Notice("003","一定要多写代码,多练习呦!")); list.add(new Notice("002","欢迎学习Java Web课程!")); list.add(new Notice("001","欢迎来到慕课网!")); request.setAttribute("notice", list); request.getRequestDispatcher("/notice.jsp").forward(request, response); } }
<%@ 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>公告展示</h1> <c:forEach items="${requestScope.notice}" var="n"> <h2>${n.id }-${n.name }</h2> </c:forEach> </body> </html>
另外我想问下地址栏输入http://localhost:8080/jstl/notice.jsp对吗
1回答
同学你好,这里测试运行贴出代码,在地址栏中输入/ns,后跳转进入notice.jsp页面,展示效果如下:
这里同学需要注意一点,那就是在地址栏中需要输入的是NoticeServlet这个servlet对应的地址中,向request中存入数据list跳转到notice.jsp。
如果直接进入notice.jsp,那request中并没有对应的数据内容呐,所以不会直接展示出来的呐。
如果我的回答解决了你的疑惑,请采纳,祝学习愉快~
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