I've been able to get a jsonarray from a json string, but don't know how to put it in a Hashmap with a String that shows the type of cargo and an Integer showing the amount.
The string:
"cargo":[
{"type":"Coals","amount":75309},
{"type":"Chemicals","amount":54454},
{"type":"Food","amount":31659},
{"type":"Oil","amount":18378}
]
This fixed it for me:
JsonArray jsoncargo = jsonObject.getJsonArray("cargo");
Map<String, Integer> cargo = new HashMap<>();
for (int i = 0; i < jsoncargo.size(); i++) {
String type = jsoncargo.getJsonObject(i).getString("type");
Integer amount = jsoncargo.getJsonObject(i).getInt("amount");
cargo.put(type, amount);
}
type and amount will win, and I don't see how the list is going to be created on the map. I think it should be defined as Map<String, ArrayList> cargList = new HasMap<>() then generate the array list myCargoList from the JSON Array, and add it to the map using cargo.put("cargoList", myCargoList). Please let me know if this is the correct understanding.I've been able to solve this using the Google GSON
Map<String, Integer> cargoMap = new HashMap<>();
JsonObject jsonObject = new Gson().fromJson(yourJsonString, JsonObject.class);
JsonArray cargo = jsonObject.getAsJsonArray("cargo");
cargo.forEach(item ->
{
String type = item.getAsJsonObject().get("type").getAsString();
int amount = item.getAsJsonObject().get("amount").getAsInt();
if (StringUtils.isNotBlank(type) || amount != 0) {
cargoMap.put(type, amount);
}
});
Where "yourJsonString" is the whole json that contains the cargo json array.
If the JSON is
[
{
"key": "customerRefNo",
"value": "A"
}
]
Map<String, String> map = new HashMap<>();
params.forEach(e -> map.put(e.get("key").asText(), e.get("value").asText()));
Try creating a new HashMap, and loop through the JSONArray, adding each element to the hashmap.
JSONArray allCargo = jsonObject.getJsonArray("cargo");
HashMap<String, String> hm = new HashMap();
for(Object cargo : allCargo) {
LinkedHashMap lhm = (LinkedHashMap) cargo;
hm.put((String)lhm.get("type"), (String)lhm.get("amount"));
}
