在文件jsp中打印属性向量

问题描述

我有一个名为“Commande”的 Bean，其属性为“client”和 Vector“achats” 这个向量用于放置购买的物品。所以当我调用“achat.html”并输入我的产品名称时，他会调用“panier.PHP”将它放在这个向量上当我去“AfficherPanier.jsp”时，他会打印购买的文章
单击“afficherPanier.jsp”时出现错误：消息在类型为 [enis.Commande] 的 bean 中找不到关于属性 [Achats] 的任何信息

achat.html
<!DOCTYPE html>
<html>
<head>
<Meta charset="UTF-8">
<title>Achat</title>
</head>
<body>
<form action="http://localhost:8080/AchatEnLigneMVC/Panier" method=GET>
Entrer l'article à acheter : <input type="text" name="achat"/><br>
<input type="submit" value="Valider"/>
</form>
</body>
</html>


Commande.java
package enis;

import java.util.Vector;

public class Commande {
    String client;
    Vector Achats = new Vector();
    public String getClient() {
        return client;
    }
    public void setClient(String client) {
        this.client = client;
    }
    public Vector getAchats() {
        return Achats;
    }
    public void setAchats(Vector achats) {
        Achats = achats;
    }

    
}
    
    ```

Panier.java
package enis;

public class Panier extends HttpServlet {
   private static final long serialVersionUID = 1L;
      
   /**
    * @see HttpServlet#HttpServlet()
    */
   public Panier() {
       super();
       // Todo Auto-generated constructor stub
   }

   /**
    * @see HttpServlet#doGet(HttpServletRequest request,HttpServletResponse response)
    */
   protected void doGet(HttpServletRequest request,HttpServletResponse response) throws servletexception,IOException {
       response.setContentType("text/html");
       PrintWriter out = response.getWriter();
       HttpSession session = request.getSession(true);
       Commande cmd=  new Commande();
       Vector v = new Vector();
       String newitem = request.getParameter("achat");
       v.addElement(newitem);
       cmd.setAchats(v);
       session.setAttribute("commande",cmd);
       response.sendRedirect("http://localhost:8080/AchatEnLigneMVC/Achat.html");
   }

   /**
    * @see HttpServlet#doPost(HttpServletRequest request,HttpServletResponse response)
    */
   protected void doPost(HttpServletRequest request,IOException {
       
   }

}

AfficherPanier.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
   pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<Meta charset="UTF-8">
<title>Afficher Panier</title>
</head>
<body>
<jsp:useBean id="commande" class="enis.Commande" scope="session"/>
<jsp:getProperty property="Achats" name="commande"/>
</body>
</html>

解决方法

请使用 Java 命名约定：

Vector achats = new Vector();

在 bean 和 JSP 标记中使用小写 achats 后，它将起作用。

另外，不需要初始化Vector。

eclipse-jee java java