将JavaScript数组发送到Servlet

Question

Hello I have been looking at other threads like mine and I can't seem to get my code working!

I need to send the JS array containing ints to a servlet this is current code:

Javascript code :

function sendReminderEmails(){
$("#sendReminderEmails").click(function(){

var people = null;
var peopleBatch1 = null;

$.ajax({
    type: "POST",
    url:"getAllUnregisteredPeople",
    async: false,  
    success: function(data){      
    people =JSON.parse(data);
  }
});

 peopleBatch1 = people.splice(0,200);

 $.post("sendReminderEmails", {people:peopleBatch1,  mode : "insert"} , function(data){

   });
 });    
}

Servlet Code :

protected void doPost(HttpServletRequest request, HttpServletResponse response){    
  String peopleIDs[] = request.getParameterValues("people");    
}

It keeps returning null! Can someone tell me if I am doing something wrong ?

Answer 1

in "$ajax" you need to pass the required parameter, eg

   var myArray={'john', 'paul'};
   $.ajax ({
            type: "POST",
            url:"getAllUnregisteredPeople",
            data: {people: myArray}
            async: false,  
            success: function(data) {      
                people = JSON.parse(data);
            }
        });

Answer 2

You must use JSON.stringify to send your JavaScript object as JSON string.

Change your code

var obj = { people: peopleBatch1, mode: "insert" };
$.post("sendReminderEmails",JSON.stringify(obj) , function(data) {});

On Servlet side you need you use

String jsonStr = request.getParameter("people");

then Convert this jsonStr to JSON object.