JSP：如何将对象数组从 servlet 传递到 JSP答案

【问题标题】：JSP: How to pass array of object from servlet to JSPJSP：如何将对象数组从 servlet 传递到 JSP
【发布时间】：2014-12-06 19:25:12
【问题描述】：

如何将对象数组 (Mcq[] mcq) 从 servlet 传递到 JSP？如何在 jsp 中使用 taglib 从对象数组中提取数据？

类：

public class Mcq {
private String question;
private String choice_1;
private String choice_2;

/* GETTERS AND SETTERS */
}

控制器：

String question, choice_1, choice_2;
Mcq[] mcq = new Mcq[100];

for(int i=0; i<mcqCount; i++){
    question = request.getParameter("mcq-question-"+i);
    choice_1 = request.getParameter("mcq-choice-"+i);
    choice_2 = request.getParameter("mcq-choice-"+i);
    mcq[i].setQuestion(question);
    mcq[i].setChoice_1(choice_1);
    mcq[i].setChoice_2(choice_2);
}

request.getSession().setAttribute("mcq", mcq);      
RequestDispatcher dispatcher;
dispatcher = request.getRequestDispatcher("testpage.jsp");
dispatcher.forward(request, response);

HTML (testpage.jsp)：

<body>
    <h1>           
        Question: ${mcq.getQeustion()}
        Choice-1: ${mcq.getChoice_1()}
        Choice-2: ${mcq.getChoice_2()}
    </h1>
</body>

【问题讨论】：

标签： java arrays jsp servlets model-view-controller

【解决方案1】：

    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>    
    <body>
        <h1>
            <c:forEach var="mcq" items="${mcq}">
                Question: ${mcq.question}
                Choice-1: ${mcq.choice_1}
                Choice-2: ${mcq.choice_2}
            </c:forEach>
        </h1>
   </body>

EL "${mcq}" 表达式应该能够抓取 Mcq 的，因为您已将它们设置为会话属性。

【讨论】：