发送ArrayList <Product> 从Servlet接收并在JSP中接收
[英]Send ArrayList<Product> from Servlet and receive in JSP
问题描述
This is my servlet code. 
这是我的servlet代码。 Here, products is an object of ArrayList<Products> and I am sending this to a JSP file. 在这里， products是ArrayList<Products>的对象，我将其发送到JSP文件。 request is an object of type HttpServletRequest . request是HttpServletRequest类型的对象。
request.setAttribute("listOfProducts", products);
request.getRequestDispatcher("UpdateProduct.jsp").forward(request, response);
In my JSP, I tried to receive this. 在我的JSP中，我尝试接收此消息。
ArrayList<Products> product = request.getAttribute("listOfProducts");
It shows me this error 它告诉我这个错误
Type mismatch: cannot convert from Object to ArrayList
Then I tried this 然后我尝试了这个
ArrayList<Products> product = (ArrayList<Products>) request.getAttribute("listOfProducts");
Then I got this warning 然后我得到了这个警告
Multiple annotations found at this line: - Type safety: Unchecked cast from Object to ArrayList - Type mismatch: cannot convert from Object to ArrayList
1 个解决方案
解决方案1
1 已采纳 2017-09-15 10:35:28
The following is the modern (environmentally friendly!) way to do this: 以下是执行此操作的现代方式（环境友好！）：
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:jsp="http://java.sun.com/JSP/Page"
xmlns:c="http://java.sun.com/jsp/jstl/core">
<head>
...
</head>
<body>
...
<c:forEach items="${listOfProducts}" var="product">
<tr><td>${product.id} </td>
<td>${product.name} </td>
<td>${product.whatever} </td></tr>
</c:forEach>
...
</body>
</html>
The file extension of your JSP must be .jspx . JSP的文件扩展名必须为.jspx 。
No java code is required in the page. 页面中不需要Java代码。
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