How to serialize Object to JSON

Question

I need to serialize some objects to a JSON and send to a WebService  How can I do it using the org json library  Or I ll have to use another one  Here is the class I need to serialize   public class PontosUsuario        public int idUsuario      public String nomeUsuario      public String CPF      public String email      public String sigla      public String senha      public String instituicao       public ArrayList lt Ponto gt  listaDePontos        public PontosUsuario                   criando a lista         listaDePontos   new ArrayList lt Ponto gt                I only put the variables and the constructor of the class but it also have the getters and setters  So if anyone can help please

User · Answer

The  reference  Java implementation by Sean Leary is here on github  Make sure to have the latest version - different libraries pull in versions buggy old versions from 2009   Java EE 7 has a JSON API in javax json  see the Javadoc   From what I can tell  it doesn t have a simple method to marshall any object to JSON  you need to construct a JsonObject or a JsonArray   import javax json     JsonObject value   Json createObjectBuilder     add  firstName    John     add  lastName    Smith     add  age   25    add  address   Json createObjectBuilder         add  streetAddress    21 2nd Street         add  city    New York         add  state    NY         add  postalCode    10021      add  phoneNumber   Json createArrayBuilder         add Json createObjectBuilder             add  type    home             add  number    212 555-1234          add Json createObjectBuilder             add  type    fax             add  number    646 555-4567       build     JsonWriter jsonWriter   Json createWriter       jsonWriter writeObject value   jsonWriter close      But I assume the other libraries like GSON will have adapters to create objects implementing those interfaces

User · Answer

GSON  is easy to use and has relatively small memory footprint   If you loke to have even smaller footprint  you can grab    https   github com ko5tik jsonserializer  Which is tiny wrapper around stripped down GSON libraries for just POJOs

User · Answer

After JAVAEE8 published   now you can use the new JAVAEE API JSON-B  JSR367   Maven dependency     lt dependency gt       lt groupId gt javax json bind lt  groupId gt       lt artifactId gt javax json bind-api lt  artifactId gt       lt version gt 1 0 lt  version gt   lt  dependency gt    lt dependency gt       lt groupId gt org eclipse lt  groupId gt       lt artifactId gt yasson lt  artifactId gt       lt version gt 1 0 lt  version gt   lt  dependency gt    lt dependency gt       lt groupId gt org glassfish lt  groupId gt       lt artifactId gt javax json lt  artifactId gt       lt version gt 1 1 lt  version gt   lt  dependency gt    Here is some code snapshot    Jsonb jsonb   JsonbBuilder create       Two important API   toJson fromJson String result   jsonb toJson listaDePontos     JSON-P is also updated to 1 1 and more easy to use  JSON-P 1 1  JSR374   Maven dependency     lt dependency gt       lt groupId gt javax json lt  groupId gt       lt artifactId gt javax json-api lt  artifactId gt       lt version gt 1 1 lt  version gt   lt  dependency gt    lt dependency gt       lt groupId gt org glassfish lt  groupId gt       lt artifactId gt javax json lt  artifactId gt       lt version gt 1 1 lt  version gt   lt  dependency gt    Here is the runnable code snapshot    String data       name     Json                          age    29                         phoneNumber     10000 12000                         address      test              JsonObject original   Json createReader new StringReader data   readObject               getValue           JsonPointer pAge   Json createPointer   age            JsonValue v   pAge getValue original           System out println  age is     v toString             JsonPointer pPhone   Json createPointer   phoneNumber 1            System out println  phoneNumber 2 is     pPhone getValue original  toString

User · Answer

The quickest and easiest way I ve found to Json-ify POJOs is to use the Gson library   This blog post gives a quick overview of using the library

User · Answer

One can use the Jackson library as well   Add Maven Dependency    lt dependency gt     lt groupId gt com fasterxml jackson core lt  groupId gt      lt artifactId gt jackson-core lt  artifactId gt   lt  dependency gt    Simply do this   ObjectMapper mapper   new ObjectMapper    String json   mapper writeValueAsString  serializableObject

User · Answer

Easy way to do it without annotations is to use Gson library  Simple as that   Gson gson   new Gson    String json   gson toJson listaDePontos

User · Answer

You make the http request   HttpResponse response   httpclient execute httpget              HttpEntity entity   response getEntity     inputStream   entity getContent     BufferedReader reader   new BufferedReader new InputStreamReader inputStream   UTF-8    8               StringBuilder sb   new StringBuilder         You read the Buffer   String line   null  while   line   reader readLine       null    sb append line     n      Log d  Result   sb toString     result   sb toString         Create a JSONObject and pass  the result string to the constructor    JSONObject json   new JSONObject result        Parse the json results to your desired variables    String usuario  json getString  usuario    int idperon   json getInt  idperson    String nombre   json getString  nombre      Do not forget to import   import org json JSONObject

[java] How to serialize Object to JSON?

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