how to convert hashMap to Json file

Question

I am leaning Java.

I have to transfer a Hashmap to Server using rpc.

HashMap

Map<String, String> testMap = new HashMap<String, String>();
testMap .put("1", "abc");
testMap .put("2", "ezc");
testMap .put("3", "afc");
testMap .put("4", "cvc");
..

how to do that.

Answer 1

Take a look at Jackson JSON processor. In particular the code will look something like:

Map map = your map
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(map);

If you want pretty JSON (multiple lines) for debugging, then use:

String json = mapper.defaultPrettyPrintingWriter().writeValueAsString(map);