Convert Map to JSON using Jackson

Question

How can I convert a Map to a valid JSON using Jackson   I am doing it using Google s GSON via a Spring Boot REST Post method     Here s the RESTful Web Service   import java util Map   import org springframework web bind annotation RequestBody  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RequestMethod  import org springframework web bind annotation RestController   import com fasterxml jackson core JsonFactory  import com fasterxml jackson core JsonParser  import com google gson Gson    RestController  RequestMapping   myservice   public class ValidationService             RequestMapping value   validate   method   RequestMethod POST      public void validate  RequestBody Map lt String  Object gt  payload  throws Exception           Gson gson   new Gson            String json   gson toJson payload            System out println json             So  when I invoke it using this   curl -H  Accept  application json  -H  Content-type  application json    -X POST -d    name   value    http   localhost 8080 myservice validate   Receive the following to stdout  this is exactly what I want      name   value     Is there a better way to do this using Jackson instead of Google s Gson and   or am I going about it the wrong way altogether

User · Answer

You should prefer Object Mapper instead  Here is the link for the same   Object Mapper - Spring MVC way of Obect to JSON

User · Answer

If you re using jackson  better to convert directly to ObjectNode     not including SerializationFeatures for brevity static final ObjectMapper mapper   new ObjectMapper       pass it your payload public static ObjectNode convObjToONode Object o        StringWriter stringify   new StringWriter        ObjectNode objToONode   null       try           mapper writeValue stringify  o           objToONode    ObjectNode  mapper readTree stringify toString           catch  IOException e            e printStackTrace               System out println objToONode       return objToONode

User · Answer

You can convert Map to JSON using Jackson as follows   Map lt String String gt  payload   new HashMap lt  gt     payload put  key1   value1    payload put  key2   value2     String json   new ObjectMapper   writeValueAsString payload   System out println json

User · Answer

Using jackson  you can do it as follows       ObjectMapper mapper   new ObjectMapper        String clientFilterJson           try           clientFilterJson   mapper writeValueAsString filterSaveModel         catch  IOException e            e printStackTrace

[java] Convert Map to JSON using Jackson

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