java - Convert JSONObject to HashMap<String, String>

Question

I have a JSONObject structured like this:

"data": {
   "title": "Pool Party",
   "date": {
       "start": "2018-08-14T15:44:44.625Z",
       "end": "2018-08-14T18:44:44.625Z"
}

and I'd like to convert it to

HashMap<String, String>

is there a way to structure the map in the same way for what regards the "start" and "end" field, which are under the "date" field?

I tried to convert it using Gson like this:

Type type = new TypeToken<Map<String, String>>(){}.getType();
HashMap<String, String> params = Gson().fromJson(jsonString, type);

but I got this error:

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT

probably because of the structure of my JSON string

Is there a way to get something like this? Thank you for your help.

Duplicate question Here already given a solution solution

OnTheRoad
– OnTheRoad

2018-08-29 01:36:42 +00:00
Commented Aug 29, 2018 at 1:36 — OnTheRoad
– OnTheRoad, Commented Aug 29, 2018 at 1:36
it's not exactly what I want @Himly

Mantech
– Mantech

2018-08-29 02:00:08 +00:00
Commented Aug 29, 2018 at 2:00 — Mantech
– Mantech, Commented Aug 29, 2018 at 2:00

OnTheRoad · Accepted Answer · 2018-08-29 01:50:09Z

1

You can use the ObjectMapper to convert it.

public void testJackson() throws IOException {  
    ObjectMapper mapper = new ObjectMapper(); 
    String json = "{"data": {"title": "Pool Party","date": {"start": "2018-08-14T15:44:44.625Z", "end": "2018-08-14T18:44:44.625Z"}}}"; 
    TypeReference<HashMap<String,Object>> typeRef 
            = new TypeReference<HashMap<String,Object>>() {};

    HashMap<String,Object> o = mapper.readValue(from, typeRef); 
    System.out.println("Got " + o); 
}

edited Aug 29, 2018 at 1:50

answered Aug 29, 2018 at 1:41

OnTheRoad

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1 Comment

Mantech Over a year ago

But I need it to be converted to HashMap<String, String> not HashMap<String, Object>

Saeed Zhiany · Accepted Answer · 2018-08-29 04:37:13Z

0

try something like this:

public void testJackson() throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    String json = "{\"data\": {\"title\": \"Pool Party\",\"date\": {\"start\":\"2018-08-14T15:44:44.625Z\", \"end\":\"2018-08-14T18:44:44.625Z\"}}}";
    TypeReference<HashMap<String, Object>> typeRef = new TypeReference<HashMap<String, Object>>() {
    };
    HashMap<String, Object> o = mapper.readValue(from, typeRef);
    System.out.println("Got " + o);
}

edited Aug 29, 2018 at 4:37

Saeed Zhiany

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answered Aug 29, 2018 at 3:25

user10287705

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