import com.alibaba.fastjson.*;
import com.alibaba.fastjson.serializer.*;

public class JSONFilter {
	
	public static class MyValueFilter implements ValueFilter {
		public Object process(Object object, String name, Object value) {
			if (value != null && value instanceof Double) {
				String str = value.toString();
				if (str.endsWith(".0"))
					str = str.substring(0, str.length() - 2);
				else if (str.endsWith(".00"))
					str = str.substring(0, str.length() - 3);
				return str;
			}
			return value;
		}
	}
	
	public static void main(String[] args) {
		JSONObject json = new JSONObject(true);
		json.put("double", 1.0);
		System.out.println(JSON.toJSONString(json));
		System.out.println(JSON.toJSONString(json, new MyValueFilter()));
		System.out.println(json.get("double").getClass().getName());
	}
}