Gson Directly convert String to JsonObject no POJO

Question

Can t seem to figure this out  I m attempting JSON tree manipulation in GSON  but I have a case where I do not know or have a POJO to convert a string into  prior to converting to JsonObject  Is there a way to go directly from a String to JsonObject   I ve tried the following  Scala syntax    val gson    new GsonBuilder  create  val a  JsonObject   gson toJsonTree       a    A    b   true       getAsJsonObject val b  JsonObject   gson fromJson       a    A    b   true       classOf JsonObject     but a fails  the JSON is escaped and parsed as a JsonString only  and b returns an empty JsonObject   Any ideas

User · Answer

Just encountered the same problem   You can write a trivial custom deserializer for the JsonElement class   import com google gson Gson  import com google gson GsonBuilder  import com google gson JsonElement  import com google gson JsonObject   GsonBuilder gson builder   new GsonBuilder    gson builder registerTypeAdapter          JsonElement class          new JsonDeserializer lt JsonElement gt                   Override             public JsonElement deserialize JsonElement arg0                      Type arg1                      JsonDeserializationContext arg2                      throws JsonParseException                    return arg0                             String str        a      A      b    true     Gson gson   gson builder create    JsonElement element   gson fromJson str  JsonElement class   JsonObject object   element getAsJsonObject

User · Answer

The simplest way is to use the JsonPrimitive class  which derives from JsonElement  as shown below   JsonElement element   new JsonPrimitive yourString   JsonObject result   element getAsJsonObject

User · Answer

com google gson JsonParser parse java lang String  is now deprecated so use com google gson JsonParser parseString  it works pretty well Kotlin Example  val mJsonObject   JsonParser parseString myStringJsonbject  asJsonObject  Java Example  JsonObject mJsonObject   JsonParser parseString myStringJsonbject  getAsJsonObject

User · Answer

String jsonStr       a      A       Gson gson   new Gson    JsonElement element   gson fromJson  jsonStr  JsonElement class   JsonObject jsonObj   element getAsJsonObject

User · Answer

I believe this is a more easy approach   public class HibernateProxyTypeAdapter implements JsonSerializer lt HibernateProxy gt        public JsonElement serialize HibernateProxy object           Type type           JsonSerializationContext context             return new GsonBuilder   create   toJsonTree initializeAndUnproxy object    getAsJsonObject               that will convert enum object to its ordinal value and convert it to json element             public static  lt T gt  T initializeAndUnproxy T entity            if  entity    null                throw new                 NullPointerException  Entity passed for initialization is null                       Hibernate initialize entity           if  entity instanceof HibernateProxy                entity    T    HibernateProxy  entity  getHibernateLazyInitializer                        getImplementation                      return entity            And then you will be able to call it like this   Gson gson   new GsonBuilder            registerTypeHierarchyAdapter HibernateProxy class  new HibernateProxyTypeAdapter             create      This way all the hibernate objects will be converted automatically

User · Answer

use JsonParser  for example    JsonParser parser   new JsonParser    JsonObject o   parser parse     a      A      getAsJsonObject

User · Answer

Came across a scenario with remote sorting of data store in EXTJS 4 X where the string is sent to the server as a JSON array  of only 1 object   Similar approach to what is presented previously for a simple string  just need conversion to JsonArray first prior to JsonObject   String from client     property   COLUMN NAME   direction   ASC     String jsonIn        property     COLUMN NAME     direction     ASC       JsonArray o    JsonArray new JsonParser   parse jsonIn    String sortColumn   o get 0  getAsJsonObject   get  property   getAsString     String sortDirection   o get 0  getAsJsonObject   get  direction   getAsString

User · Answer

The JsonParser constructor has been deprecated  Use the static method instead   JsonObject asJsonObject   JsonParser parseString request schema  getAsJsonObject

User · Answer

import com google gson JsonObject    JsonObject complaint   new JsonObject    complaint addProperty  key    value

User · Answer

Try to use getAsJsonObject   instead of a straight cast used in the accepted answer   JsonObject o   new JsonParser   parse     a      A      getAsJsonObject

[java] Gson: Directly convert String to JsonObject (no POJO)

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