How to get values from array in jsp

Question

I want to show the data from an array using JSP.

I have three files:

index.jsp:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>Hello World! </h1>
        <form name="Input Name Form" action="response.jsp"/>
        <p> Enter your name:</p>
           <input type="text" name="name"/>  
           <input type="submit"   value="ok" />
    </form>

    </body>
</html>

response.jsp:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>Hello World!</h1> <br>
        <jsp:useBean id="aaa" scope="page" class="A.a" />
        <jsp:setProperty name="aaa" property="name" value="<%= request.getParameter("name")%>" />
        <jsp:getProperty name="aaa" property="name" />

    </body>
</html>

a.java:

public class a {
    public a ()
    {}
    private String name;
ArrayList() array_list = new ArrayList();


    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    //some magic to fill array_list with values

    }
}

My question is:

What statement should I use in jsp to get values from array_list in a.java?

I know that there is statement

<c:forEach> </c:forEach>

but I am not sure how to use it.

I have edited your question to become more clear and easier to read. Your code was marked as code *and* blockquote (lines that begin with `>`), so I have removed the blockquotes. To get the right indentation within a list, code has to be indented 8 spaces and not just 4, but that's really a detail. I have highlighted inline code and filenames with backticks, removed the ALL CAPS (which can be perceived as rude) and the "thank you", which is not necessary. — Benjamin W., Jan 28 '16 at 07:29

score 1 · Answer 1 · edited May 23 '17 at 11:50

1

A similar question has been asked here: Iterate ArrayList in JSP

Long story short:

<c:forEach items="${aaa.array_list}" var="item">
    ${item}
</c:forEach>

edited May 23 '17 at 11:50

Community

1
1

answered Jan 28 '16 at 07:10

Frank

2,036
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doesn't work, for some reason. I just put this snippet in my code but nothing happened. It seems I'm missing something. – Imugi Jan 28 '16 at 11:49
The snippet should only show how to iterate and display the values. Of course you have to replace ${myList} with the real property. In your case ${aaa.array_list} which still won't display anything as you do not fill the list in a.java. – Frank Jan 28 '16 at 12:04

score 1 · Answer 2 · answered Jan 28 '16 at 07:15

<c:forEach items="${dataDetail}" var="data" varStatus="item">
    <c:out value="${data.id}"/>
</c:forEach>

Here "dataDetail" is name of the key where you have set your list in controller.

(session or request ).setAttribute("dataDetail",---List of Data of type Class Data---);

Above code is similar to

for(Data data : dataDetail){
   System.out.println(data.getId());
}

score 0 · Answer 3 · answered Jan 28 '16 at 08:39

use JSTL.

Try this out:

Have this at top of your JSP:

<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>  
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

And code for displaying data

<c:forEach begin="0" end="${fn:length(array_list) - 1}" var="index">
   <tr>
      <td><c:out value="${array_list[index]}"/></td>
   </tr>
</c:forEach>

How to get values from array in jsp

3 Answers3