I'm using Java.
I have a JSON string like this given below :
{
"4562": {
"a": "foo1",
"b": "56",
"c": "1342"
},
"4563": {
"a": "foo2",
"b": "57",
"c": "1343"
}
}
I want to store all the data from the JSON string into Map.
How to do that ?
You need to use Jackson Library (jackson-databind).
Code :
import java.io.IOException;
import java.util.Map;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class Example {
public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper mapper = new ObjectMapper();
String inputJson = "{ \n" +
" \"4562\": { \n" +
" \"a\": \"foo1\", \n" +
" \"b\": \"56\", \n" +
" \"c\": \"1342\" \n" +
" },\n" +
" \"4563\": { \n" +
" \"a\": \"foo2\", \n" +
" \"b\": \"57\", \n" +
" \"c\": \"1343\" \n" +
" }\n" +
"}";
Map<String, Map<String, String>> map = mapper.readValue(inputJson, Map.class);
System.out.println(map);
}
}
Output :
{4562={a=foo1, b=56, c=1342}, 4563={a=foo2, b=57, c=1343}}
Download jar from here : https://repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-databind/2.10.1/
Use Gson:
String json = ...;
Gson gson = new GsonBuilder.setPrettyPrinting().create();
Map<String, Map<String, String>> map = gson.<Map<String, Map<String, String>>>fromJson(json, Map.class);
System.out.println(map);
