如何使用 JSTL 将来自不同文本框的所有数据保存在一个数组中？

Question

I want to recieve any number of textbox values, and save it to an array with JSTL if it's possible.

I generate all the texbox where numberAsked can be any number.

<c:if test="${param.buttonSend != null}">
        <form action="index.jsp" method="post">
                <c:forEach var = "i" begin = "1" end = "${param.numberAsked}">
                        <input type="text" name="textbox[]" class="form-control">
                </c:forEach>
            <button type="submit" name="buttonSave">Save</button>
        </form>
</c:if>

Now I want to save all the textboxs in an array.

<c:if test="${param.buttonSave != null}">
    <c:set var="data" value="${request.getParameterValues(textbox)}"/>
    <c:forEach var = "item"  items="${param.data}">
        <c:out value="${item}"/>
    </c:forEach>
</c:if>

But, it doesn't work, how can I save all the data from all the generated textboxs in an array? .

Answer 1

"Now I want to save all the textboxs in an array." You want to do scripting without a scriptlet. The only way that I could think of is to use the useBean tag to create an ArrayList. It's add method returns a boolean. That is why I used empty if tags to insert the elements. Here is a demonstration JSP.

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<jsp:useBean id="myArray" class="java.util.ArrayList" />
<form method="post">
    <c:forEach var = "i" begin = "0" end = "5">
         <input type="text" name="textbox">
    </c:forEach>
    <button type="submit" name="buttonSave">Save</button>
</form>
    <c:forEach var = "item"  items="${paramValues}">
        <c:if test='${item.key == "textbox"}'>
            <c:forEach var='boxValue' items='${item.value}'> 
                <c:if test = '${myArray.add(boxValue)}'>
                </c:if>
            </c:forEach>
        </c:if>
    </c:forEach>
    <c:forEach var="element" items="${myArray}">
        ${element},
    </c:forEach>