Mapping a list with JSP page and getting values in Action class. It gives the result list as a cartesian product in Action class

Question

I am working on a project where I have to send data from JSP page to action class in the form of List, I am setting List<Object> from action class first time when it mapped with JSP page, when I am doing action for saving the details, In action I get a values of List<Object> like as Cartesian Product for each value.

e.g. If there are List of 3 Objects(having 4 member fields) passing to JSP, when returning to action it generates 12 objects with different values of JSP.

The Image shows the Demo UI, it is not a table, but each Row represents an object of list

The image shows the Demo UI which I need
In The action class

 List<Pojo> PojoList = new ArrayList<Pojo>();

Can anyone suggest me what approach should I use, this is new scenario for me, I also tried some example from internet but not succeed, I also iterate the list in JSP but It was giving me an error.(not exactly error but it does not give fields on JSP);

In JSP:

<c:forEach var="pojo" items="${pojoList}">
    <s:textarea name="pojo.field1">
    <s:textarea name="pojo.field2">
    <s:textarea name="pojo.field3">
    <s:textarea name="pojo.field4">
</c:forEach>

Return In Action Class method(It prints 12 objects)

try {
    System.out.println("List : "+pojoList);
    for (Iterator<Pojo> iterator = pojoList.iterator(); iterator.hasNext();) {
        Pojo pojo = (Pojo) iterator.next();
        System.out.println("\n MB : "+pojo);
       }
} catch (Exception e) {
    e.printStackTrace();
}

Please suggest me whats going wrong.

Roman C · Accepted Answer · 2014-10-15T13:04:05.950

1

If you have 3 pojos in the list then each one have 4 fields added to the list by default, so 3*4 = 12. The code is working fine, but if you change it like

<s:iterator value="pojoList" status="stat">
    <s:textarea name="pojoList[%{#stat.index}].field1">
    <s:textarea name="pojoList[%{#stat.index}].field2">
    <s:textarea name="pojoList[%{#stat.index}].field3">
    <s:textarea name="pojoList[%{#stat.index}].field4">
</s:iterator>

it will use the same index for each field, so 3 pojos will be created/updated.

edited Oct 15 '14 at 13:04

answered Oct 15 '14 at 12:58

Roman C

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I did this way but it returns a list as null, – MegaBytes Oct 15 '14 at 18:16
This is because you are missing getters and setters for the beans. – Roman C Oct 15 '14 at 18:33
Hi Roman, I have already created the getter & setter for the fields and the list object – MegaBytes Oct 16 '14 at 05:52
Then you should configure the action to include `params` interceptor. – Roman C Oct 16 '14 at 09:30
2

Hi Roman, My Problem is I have to pass the List – MegaBytes Oct 17 '14 at 09:59

Mapping a list with JSP page and getting values in Action class. It gives the result list as a cartesian product in Action class

1 Answers1