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jstl实现在jsp中动态添加下拉列表项

2024-09-05 00:17:44
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 使用下面这个jsp的前,你需要写一个Stu类,生成set和get方法。

Public Class Stu{ private int id; private String name; public void setId(int id){ this.id=id; } public int getId(){ return this.id; } public void setName(String name){ this.name=name; } public String getName(){ return this.name; }}

写个简单的servlet

public class gotoMall extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ArrayList<Stu> stus=new ArrayList<Stu>(); Stu stu1=new Stu(); stu1.setId(1); stu1.setName("aa"); stu2.setId(2); stu2.setName("bb"); stus.add(stu1); stus.add(stu2); request.setAttribute("stus", stus); request.getRequestDispatcher("/WEB-INF/admin/my.jsp").forward(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); }}

my.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><!-- 引入jstl标签库 --><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html> <head> <script type="text/javascript" language="javascript" src="js/js_delete.js" charset="gbk"></script> <link href="css/main.css" rel="stylesheet" type="text/css" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>My JSP page</title> </head> <body> LIST:<select> <!-- 前提是已经把stus这个list放到了request.attribute中. 在servlet或action中 request.setAttribute(stus); --> <c:forEach items="${stus}" var="stu"> <!-- Stu类中必须有set和get方法 --> <option>${stu.name}</option> </c:forEach> </select> </body></html>

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