JQuery ajax post - data in a java servlet

Question

I want to send data to a java servlet for processing   The data will have a variable length and be in key value pairs     A1984   1  A9873   5  A1674   2  A8724   1  A3574   3  A1165   5     The data doesn t need to be formated this way  it is just how I have it now   var saveData     ajax         type   POST         url   someaction do action saveData         data  myDataVar toString          dataType   text         success  function resultData             alert  Save Complete                saveData error function     alert  Something went wrong          The   ajax   function works fine as I do get an alert for  Save Complete   My dilemna is on the servlet   How do I retrieve the data   I tried to use a HashMap like this     HashMap hm   new HashMap    hm putAll request getParameterMap          but hm turns out to be null which I am guessing means the  getParameterMap   isn t finding the key value pairs  Where am I going wrong or what am I missing

User · Answer

For the time being I am going a different route than I previous stated. I changed the way I am formatting the data to:

  &A2168=1&A1837=5&A8472=1&A1987=2

On the server side I am using getParameterNames() to place all the keys into an Enumerator and then iterating over the Enumerator and placing the keys and values into a HashMap. It looks something like this:

Enumeration keys = request.getParameterNames(); 
HashMap map = new HashMap(); 
String key = null; 
while(keys.hasMoreElements()){ 
      key = keys.nextElement().toString(); 
      map.put(key, request.getParameter(key)); 
}

User · Answer

To get the value from the servlet from POST command  you can follow the approach as explained on this post by using request getParameter key  format which will return the value you want

User · Answer

Simple method to sending data using java script and ajex call   First right your form like this    lt form id  frm details  method  post  name  frm details  gt   lt input  id  email  name  email  placeholder  Your Email id  type  text    gt       lt button class  subscribe-box  btn  type  submit  gt Need Assistance lt  button gt   lt  form gt     javascript logic  target on form id  frm details after sumbit     function                frm details   on  submit   function event                event preventDefault                 var formData                      email      input name email    val     for get email                             console log formData                  ajax                   url    tsmisc api subscribe-newsletter                   type   post                   data  formData                  success  function d                        alert d                                                              General  Request URL https   test abc Request Method POST Status Code 200  Remote Address 13 76 33 57 443  From Data email abc invalid ts

User · Answer

You don t want a string  you really want a JS map of key value pairs  E g   change    data  myDataVar toString      with    var myKeyVals     A1984   1  A9873   5  A1674   2  A8724   1  A3574   3  A1165   5      var saveData     ajax         type   POST         url   someaction do action saveData         data  myKeyVals        dataType   text         success  function resultData    alert  Save Complete         saveData error function     alert  Something went wrong          jQuery understands key value pairs like that  it does NOT understand a big string  It passes it simply as a string   UPDATE  Code fixed

[javascript] JQuery $.ajax() post - data in a java servlet

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