How to create a Java Servlet for a given jQuery.ajax () call?

Question

I have a file called wfd.proxy.js that contains the following lines of code :

if (!WFD) { var WFD = {}; };
if (!WFD.Proxy) { WFD.Proxy = {}; };

WFD.Proxy = 
{
    SERVICE_URL   : "/delegate/WFD/WFService?",
    PDF_SERVICE_URL : "/delegate/pdf-exporter?",
    DATA_TYPE     : "json", // used by jQuery
    DATA_TYPE_EXT : "ajax", // used by ExtJs
    DATA_TYPE_TXT : "text", // used for tests
    SaveWorkflow : function(code)
    {
        jQuery.ajax({
            url: WFD.Proxy.SERVICE_URL + "task=savemodel",
            data: { code : code },
            dataType : WFD.Proxy.DATA_TYPE,
            type: 'POST',
            success : function(data) {
                WFD.Proxy.OnSaveWorkflowCallback(data);
            },
            error : function(jqXHR, textStatus, errorThrown) {
                alert("Errore di comunicazione: " + errorThrown);
            }
        });
    }

,

    WFD.Proxy.OnSaveWorkflowCallback = function(data) 
    {

        /*
            data.response
            data.message
            data.model_new_id
            data.idsNodes[i].original_id
            data.idsNodes[i].new_id
         */
    }

};

I have written the code that converts an xml file to JSON format. The JSON string that i get from the code I've written until now, should be passed as the code parameter of SaveWorkflow : function(code) .

I'm not really sure what do I have to do at this point. I did some searches and saw that jQuery.ajax() calls where manipulated using Java Servlets ...

Any idea how to resolve this please? Thanks in advance

Answer 1

What you've written is client side code (ie executes in your browser). The part that's missing is the server side. Your "ajax call" is making an asynchronous connection to a web server, using this URL:

 /delegate/WFD/WFService?task=savemodel&code=xxxx

xxxx is the value of the code variable. Your javascript is expecting a text string as response from this URL.

You don't need a servlet per se to handle this. Any web server that accepts the ajax URL and returns the required data will do (eg PHP...)

If you need a servlet and you don't know how to build one, I think you have a lot of reading to do. I suggest: https://www.google.be/search?q=my+first+servlet