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Is it possible to bind the value from <option> to an object field as an integer in JSP?

I have a form like this in my jsp page:

<form:select class="form-control" path="mark" >
   <c:forEach begin="1" end="10" var="i" >
    <option value="${i}">${i}</option>
   </c:forEach>
</form:select>

And I want to bind the selected value to a field in an object:

@Entity
public class Feedback {
    private Integer mark;
    // getters, setters...
}

Now I have a TypeMismatch exception: Unable to convert "String" to "Integer".

How can I store the value of an integer object from <select>?

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3 answers


You have a TypeMismatch Exception because you are trying to bind String

(the request parameter is String) to Integer

.

You just need to parse its value to get an int, use Integer.parseInt()

:

Feedback feedback = new Feedback();
if(request.getParameter("radios") != null) {
    feedback.setMark(Integer.parseInt(request.getParameter("radios")));
}


And add name="radios"

to yours select

:

<form:select class="form-control" name="radios" path="mark" >
   <c:forEach begin="1" end="10" var="i" >
    <option value="${i}">${i}</option>
   </c:forEach>
</form:select>
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All request parameters are in the form of a String, so I would ask you to change the variable from Integer to String and then pass it to Integer before the logic you want to process.



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This binding works great for me. For a cleaner way, you can use an intermediate bean to bind, and then you can convert the String to a primitive before storing.

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