How to convert jsonString to JSONObject in Java

Question

I have String variable called jsonString    quot phonetype quot   quot N95 quot   quot cat quot   quot WP quot    Now I want to convert it into JSON Object  I searched more on Google but didn t get any expected answers

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To convert String into JSONObject you just need to pass the String instance into Constructor of JSONObject   Eg   JSONObject jsonObj   new JSONObject  your string

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I like to use google-gson for this  and it s precisely because I don t need to work with JSONObject directly   In that case I d have a class that will correspond to the properties of your JSON Object  class Phone    public String phonetype   public String cat          String jsonString       phonetype     N95     cat     WP      Gson gson   new Gson    Phone fooFromJson   gson fromJson jsonString  Phone class         However  I think your question is more like  How do I endup with an actual JSONObject object from a JSON String   I was looking at the google-json api and couldn t find anything as straight forward as org json s api which is probably what you want to be using if you re so strongly in need of using a barebones JSONObject   http   www json org javadoc org json JSONObject html  With org json JSONObject  another completely different API  If you want to do something like     JSONObject jsonObject   new JSONObject     phonetype     N95     cat     WP       System out println jsonObject getString  phonetype       I think the beauty of google-gson is that you don t need to deal with JSONObject  You just grab json  pass the class to want to deserialize into  and your class attributes will be matched to the JSON  but then again  everyone has their own requirements  maybe you can t afford the luxury to have pre-mapped classes on the deserializing side because things might be too dynamic on the JSON Generating side  In that case just use json org

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If you are using http   json-lib sourceforge net  net sf json JSONObject   it is pretty easy   String myJsonString  JSONObject json   JSONObject fromObject myJsonString     or  JSONObject json   JSONSerializer toJSON myJsonString     get the values then with json getString param   json getInt param  and so on

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Codehaus Jackson - I have been this awesome API since 2012 for my RESTful webservice and JUnit tests  With their API  you can    1  Convert JSON String to Java bean  public static String beanToJSONString Object myJavaBean  throws Exception       ObjectMapper jacksonObjMapper   new ObjectMapper        return jacksonObjMapper writeValueAsString myJavaBean        2  Convert JSON String to JSON object  JsonNode   public static JsonNode stringToJSONObject String jsonString  throws Exception       ObjectMapper jacksonObjMapper   new ObjectMapper        return jacksonObjMapper readTree jsonString        Example  String jsonString       phonetype     N95     cat     WP         JsonNode jsonNode   stringToJSONObject jsonString   Assert assertEquals  Phonetype value not legit     N95   jsonNode get  phonetype   getTextValue     Assert assertEquals  Cat value is tragic     WP   jsonNode get  cat   getTextValue        3  Convert Java bean to JSON String      public static Object JSONStringToBean Class myBeanClass  String JSONString  throws Exception       ObjectMapper jacksonObjMapper   new ObjectMapper        return jacksonObjMapper readValue JSONString  beanClass       REFS    Codehaus Jackson JsonNode API - How to use  navigate  parse and evaluate values from a JsonNode object Tutorial - Simple tutorial how to use Jackson to convert JSON string to JsonNode

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You can use google-gson  Details   Object Examples  class BagOfPrimitives     private int value1   1    private String value2    abc     private transient int value3   3    BagOfPrimitives            no-args constructor          Serialization   BagOfPrimitives obj   new BagOfPrimitives    Gson gson   new Gson    String json   gson toJson obj       gt  json is   value1  1  value2   abc     Note that you can not serialize objects with circular references since that will result in infinite recursion    Deserialization   BagOfPrimitives obj2   gson fromJson json  BagOfPrimitives class        gt  obj2 is just like obj   Another example for Gson   Gson is easy to learn and implement  you need to know is the following two methods   -  toJson       convert java object to JSON format  -  fromJson       convert JSON into java object  import com google gson Gson   public class TestObjectToJson     private int data1   100    private String data2    hello      public static void main String   args          TestObjectToJson obj   new TestObjectToJson          Gson gson   new Gson             convert java object to JSON format       String json   gson toJson obj          System out println json            Output    data1  100  data2   hello     Resources    Google Gson Project Home Page   Gson User Guide  Example

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Converting String to Json Object by using org json simple JSONObject   private static JSONObject createJSONObject String jsonString       JSONObject  jsonObject new JSONObject        JSONParser jsonParser new  JSONParser        if   jsonString    null   amp  amp    jsonString isEmpty               try               jsonObject  JSONObject  jsonParser parse jsonString             catch  org json simple parser ParseException e                e printStackTrace                        return jsonObject

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To anyone still looking for an answer   JSONParser parser   new JSONParser    JSONObject json    JSONObject  parser parse stringToParse

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Use JsonNode of fasterxml for the Generic Json Parsing  It internally creates a Map of key value for all the inputs   Example    private void test  RequestBody JsonNode node    input String      a   b   c   d

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String to JSON using Jackson with com fasterxml jackson databind   Assuming your json-string represents as this   jsonString     phonetype   N95   cat   WP    import com fasterxml jackson databind JsonNode  import com fasterxml jackson databind ObjectMapper         Simple code exmpl     ObjectMapper mapper   new ObjectMapper    JsonNode node   mapper readTree jsonString   String phoneType   node get  phonetype   asText    String cat   node get  cat   asText

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Better Go with more simpler way by using org json lib  Just do a very simple approach as below   JSONObject obj   new JSONObject    obj put  phonetype    N95    obj put  cat    WP      Now obj is your converted JSONObject form of your respective String  This is in case if you have name-value pairs    For a string you can directly pass to the constructor of JSONObject  If it ll be a valid json String  then okay otherwise it ll throw an exception

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Java 7 solution  import javax json          String TEXT  JsonObject body   Json createReader new StringReader TEXT   readObject

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NOTE that GSON with deserializing an interface will result in exception like below    java lang RuntimeException  Unable to invoke no-args constructor for interface XXX  Register an InstanceCreator with Gson for this type may fix this problem     While deserialize  GSON don t know which object has to be intantiated for that interface   This is resolved somehow here   However FlexJSON has this solution inherently  while serialize time it is adding class name as part of json like below          HTTPStatus    OK        class    com XXX YYY HTTPViewResponse        code   null       outputContext              class    com XXX YYY ZZZ OutputSuccessContext            eligible   true           So JSON will be cumber some  but you don t need write InstanceCreator which is required in GSON

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Using org json  If you have a String containing JSON format text  then you can get JSON Object by following steps     String jsonString       phonetype     N95     cat     WP      JSONObject jsonObj   null      try           jsonObj   new JSONObject jsonString         catch  JSONException e            e printStackTrace            Now to access the phonetype  Sysout out println jsonObject getString  phonetype

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For setting json single object to list  ie   locations         in to List lt Location gt   use   ObjectMapper mapper   new ObjectMapper    mapper configure DeserializationConfig Feature ACCEPT SINGLE VALUE AS ARRAY  true     jackson mapper-asl-1 9 7 jar

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To convert a string to json and the sting is like json    phonetype   N95   cat   WP    String Data response getEntity   getText   toString       reading the string value  JSONObject json    JSONObject  new JSONParser   parse Data   String x  String  json get  phonetype    System out println  Check Data  x   String y  String  json get  cat    System out println  Check Data  y

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Using org json library   try        JSONObject jsonObject   new JSONObject     phonetype     N95     cat     WP        catch  JSONException err        Log d  Error   err toString

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you must import org json  JSONObject jsonObj   null          try               jsonObj   new JSONObject     phonetype     N95     cat     WP                 catch  JSONException e                e printStackTrace

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No need to use any external library   You can use this class instead     handles even lists   nested lists and json   public class Utility        public static Map lt String  Object gt  jsonToMap Object json  throws JSONException            if json instanceof JSONObject              return  jsonToMap   JSONObject json             else if  json instanceof String                        JSONObject jsonObject   new JSONObject  String json                return  jsonToMap  jsonObject                      return null              private static Map lt String  Object gt   jsonToMap  JSONObject json  throws JSONException           Map lt String  Object gt  retMap   new HashMap lt String  Object gt              if json    JSONObject NULL                retMap   toMap json                     return retMap              private static Map lt String  Object gt  toMap JSONObject object  throws JSONException           Map lt String  Object gt  map   new HashMap lt String  Object gt              Iterator lt String gt  keysItr   object keys            while keysItr hasNext                  String key   keysItr next                Object value   object get key                if value instanceof JSONArray                    value   toList  JSONArray  value                              else if value instanceof JSONObject                    value   toMap  JSONObject  value                             map put key  value                     return map              public static List lt Object gt  toList JSONArray array  throws JSONException           List lt Object gt  list   new ArrayList lt Object gt             for int i   0  i  lt  array length    i                  Object value   array get i               if value instanceof JSONArray                    value   toList  JSONArray  value                              else if value instanceof JSONObject                    value   toMap  JSONObject  value                             list add value                     return list              To convert your JSON string to hashmap use this     HashMap lt String  Object gt  hashMap   new HashMap lt  gt  Utility jsonToMap

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There are various Java JSON serializers and deserializers linked from the JSON home page   As of this writing  there are these 22           JSON-java      JSONUtil      jsonp      Json-lib      Stringtree      SOJO      json-taglib      Flexjson      Argo      jsonij      fastjson      mjson      jjson      json-simple      json-io      google-gson      FOSS Nova JSON      Corn CONVERTER      Apache johnzon      Genson      cookjson      progbase          but of course the list can change

[java] How to convert jsonString to JSONObject in Java

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