我如何使用jstl在jsp中创建一个arraylist

问题描述

我想从JSP页面收集值，并借助JSTL将其动态传递给另一个JSP页面.我怎样才能做到这一点?

I want to collect values from a JSP page and pass it dynamically to another JSP page with the help of JSTL. How can I do this?

推荐答案

为此您使用了请求范围内的HashMap.

You use a request scoped HashMap for that.

1)在要插入或访问值列表的每个JSP中声明HashMap.

1) Declare the HashMap in each JSP you want to insert or access the list of values.

<jsp:useBean id="map" class="java.util.HashMap" scope="request"/>

注意:scope ="request"是使其能够在其他JSP中访问的原因.

Note: The scope="request" is what makes it accessible in other JSPs.

2)将信息填充到HashMap中

2) Stuff information into the HashMap

<c:set target="${requestScope.map}" property="city" value="${param.city}"/>
<c:set target="${requestScope.map}" property="state" value="${param.state}"/>
<c:set target="${requestScope.map}" property="phone" value="${param.phone}"/>

3a)现在，您只需执行以下操作即可拉出其他JSP中的值:

3a) You can now pull out the values in a different JSP by simply doing:

<c:out value="${requestScope.map['city']}"/>

-或-

3b)您还可以在其他JSP中对该HashMap进行迭代:

3b) You can also iterate over that HashMap in a different JSP:

<c:forEach items="${requestScope.map}" var="item">
    ${item.key} = ${item.value}<br/>
</c:forEach>

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