Java Map 到 JSON 字符串

Question

I need to convert a map to JSON string, I am using a third-party library and one of the classes in it has a field of type Map<String, Object> I need to convert that map to JSON string and send it to its destination. All works ok until I put a string into that map as a value ie if that Object in the map is a String then I end up having four double quotes ( ""value"" ) in the final JSON string I get from jackson 's OBJECT_MAPPER.writeValueAsString(str) method.

eg the following this map:

map.put("key", "value") of type Map<String, Object> will result in {"key": ""value""} which obviously is not a JSON string, any idea how to resolve this without writing a custom method to check types and solve the issue?

Answer 1

Try to use com.google.gson.Gson

   public void convertMapToJson() {
        SortedMap<String, String> elements = new TreeMap();
        elements.put("Key1", "Value1");
        elements.put("Key2", "Value2");
        elements.put("Key3", "Value3");

        Gson gson = new Gson();
        Type gsonType = new TypeToken<HashMap>(){}.getType();
        String gsonString = gson.toJson(elements,gsonType);
        System.out.println(gsonString);
    }