$ .post（）到Servlet的JavaScript数组

Question

I am using JQuery's post() , but my servlet doesn't see the array that I'm passing as a parameter.

My javascript looks like this:

var myArray = ['1', '2'];
$.post('action.do', {"arrayData":myArray, "mode":"insert"});

In my servlet:

System.out.println(request.getParameterMap());

which outputs:

{mode=insert}

I've also tried

$.post('action.do', {"arrayData[]":myArray, "mode":"insert"});

and

$.post('action.do', {"arrayData":$(myArray).serializeArray(), "mode":"insert"});

Answer 1

I had this problem. I resolved it just by adding brackets to "arrayData" parameter server-side. On client:

$.post('action.do', {arrayData:myArray, mode:"insert"});

Please, note, on the client-side arrayData parameter is without brackets.

On server:

String[] arrayData=request.getParameterValues("arrayData[]");

This worked for me!

Answer 2

Try to use

$.post('action.do', {"arrayData":myArray, "mode":"insert"});

and on server

String[] arrayData=request.getParameterValues("arrayData");

Answer 3

Here is how I pass json to my servlet, using json2.js from here . In the servlet you can then use gson , or jackson to automatically convert you json to an instance of suitable java class autonoumously.

var jsonData = $("#myform").toObject();
var strJson = JSON.stringify(jsonData);
$.ajax({
  cache:false,
  type: 'POST',
  url: myUrl,
  data:strJson,
  contentType: "application/json",
  success:  function(data) {            
          //mySuccessHanlder
    }
});