Question

I have written java code for generating json of my searched data from file.But its not generating exact JsonArray. Its like

[{"item":"1617"},{"item":"1617"}]

instead of

[{"item":"747"},{"item":"1617"}].

Here 1617 is last item which is fetched from file.

JSONArray ja = new JSONArray();
JSONObject jo = new JSONObject();

while (products.readRecord())
{
    String productID = products.get("user");
    int j = Integer.parseInt(productID);
    if(j == userId) {
        itemid = products.get("item");
        jo.put("item",itemid);
        ja.add(jo);
    }
}  

out.println(ja);
products.close();

Answer 1

you are actually creating one jSONobject object to handle two objects, shouldn’t you need to create JSONObjects in the while loop? something like this, so every iteration in while loop will create a new JSONObject and add it to JSONArray

JSONArray ja = new JSONArray();

while (products.readRecord())
{
    String productID = products.get("user");
    int j = Integer.parseInt(productID, 10);

    if(j == userId)
    {
         JSONObject jo = new JSONObject();
         itemid = products.get("item");
         jo.put("item", itemid);
         ja.add(jo);
    }

}  

out.println(ja);
products.close();

Extra:

i am not sure how java does conversion for string to integer, but i think you should always specify radix when using parseInt so the strings like ’09’ will not be treated as octal value and converted to wrong value (atleast this is true in javascript :))

Integer.parseInt(productID, 10);