如何在Jquery中解析从servlet发送到JSON的arraylist数据

Question

I am using servlet to sent data as arraylist to ajax calls.Now on client side i am trying to parse that data into json type but it is giving error as..

SyntaxError: JSON.parse: unexpected character var dbdata=JSON.parse(data);

The values that i am getting ajax success is

[INCOMING, 0, INETCALL, 0, ISD, 31.8, LOCAL, 197.92, STD, 73.2]

Here is my client side ajax code..

 $(document).ready(function() {
        $.ajax({
            type: 'GET',
            url: 'getdata',
            async:false,
            dataType: "text",
            success: function(data) {

                var dbdata=JSON.parse(data);
                alert(dbdata);
            }
        });
   });

and here is my servlet code..

ArrayList callcost = new ArrayList();

    try {
        String strQuery = "";
        ResultSet rs = null;

        Conexion conexiondb = new Conexion();
        conexiondb.Conectar();

        strQuery = "SELECT toc,Sum(callcost) as callcost FROM `asteriskcdrdb`.`processeddata_table` group by toc";

        rs = conexiondb.Consulta(strQuery);

        while (rs.next()) {
            String toc = rs.getString("toc").trim();
            String cost=rs.getString("callcost").trim();
            callcost.add(toc.trim());
            callcost.add(cost.trim());
        }

        out.print(callcost);
        System.out.println(callcost);
        out.close();

Please guys help me . Thanks in advance..

Answer 1

You say this is what AJAX returns:

[INCOMING, 0, INETCALL, 0, ISD, 31.8, LOCAL, 197.92, STD, 73.2]

The strings are invalid for JSON; it should be:

["INCOMING", 0, "INETCALL", 0, "ISD", 31.8, "LOCAL", 197.92, "STD", 73.2]

Answer 2

You can use gson and write code like,

Gson gson = new Gson();
String json = gson.toJson(callcost);

this will allow you to support more complex objects as well. Or you can build it yourself as Nikos mentioned.