What is the best way to send a form value to a servlet?

As someone who is relatively new to programming, I kindly ask for your patience with me.

I am currently attempting to extract values from a form (embedded in a JSP) using JavaScript, and then make a post request to a servlet. The form consists of 6 different values, which I retrieve in JavaScript through the following code:

var value1 = document.getElementById("value of an element in the form").value;
var value2 = document.getElementById("value of an element in the form").value;
etc

My main question pertains to performing a POST request via a JavaScript Ajax call. How can I merge all these distinct values into a single entity that could be later accessed and assigned to a POJO (Plain Old Java Object) by utilizing setter methods within the servlet? Due to project limitations, I am unable to incorporate JSON or external libraries like Jersey. Any guidance on this matter would be greatly appreciated.

javajavascriptajaxjspservlets

Answer №1

Although there are more sophisticated methods to achieve this task, the following is a simple approach. It involves combining your javascript variables into a standard post body.

var postData = 'field1=' + value1;
postData += '&field2=' + value2;
postData += '&field3=' + value3;
/*  The field names are concatenated with equals signs 
 *  and their respective values, separated by ampersands.
 */

If you're using the raw XMLHttpRequest capabilities, this variable will be passed as an argument to the send method. If utilizing jQuery, it will serve as your data element.

In your servlet, you can retrieve the values from the HttpServletRequest object provided by the container.

protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    MyObject pojo = new MyObject();
    pojo.setField1(request.getParameter("field1"));
    pojo.setField2(request.getParameter("field2"));
    pojo.setField3(request.getParameter("field3"));
    /*  At this point, your object contains data from the ajax post.
     *  Assuming that all fields in your Java class are Strings,
     *  if they are not, conversion will be necessary when passing to the setter.
     */ 
}

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