Convert a custom Object to JSON in Totalcross

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It is possible to serialize a Custom Object for JSON without having to insert field-by-field, for example:

JSONObject jsonObject = new JSONObject();                       
jsonObject.put("id", meuObjeto.id);
jsonObject.put("dt_sync", meuObjeto.dtSync);
jsonObject.put("dt_modif", meuObjeto.dtModif);

I tried to pass the object by parameter in the Jsonobject constructor

JSONObject jsonPedido = new JSONObject(pedido);

But some values are lost.

In Java, Android etc.. it is possible to use lib JACKSON for example to generate an Object Map and convert it to a JSON... Or via Annotations.. Anyway..

There is a more agile way to implement this Custom Object serialization for a Jsonobject in Totalcross?

java json totalcross

  • This constructor expects there to be getters in the object being serialized. It has how to share a complete, verifiable and minimal example?

  • This comment already explains the failure of the attempt by using the Jsonobject constructor. For our false-POJOS have no getters and setters methods..

  • Just in case.. isn’t there a class that does the opposite of Jsonfactory? Convert a Java Object to Json Object? In this case it would be through the constructor, as it would use getters methods through Reflection to popular a Json Object.. that?

  • So it doesn’t work for serialization via the JSONObject.

1 answer

1

I don’t know if you still need a solution, but I managed to do it this way:

public class AuthenticationDTO {

private String username;

private String password;

public AuthenticationDTO() {
}

public AuthenticationDTO(final String username, final String password) {
super();
this.username = username;
this.password = password;
}

public String getUsername() {
return username;
}

public String getPassword() {
return password;
}    

public void setUsername(String username) {
    this.username = username;
}

public void setPassword(String password) {
    this.password = password;
}

@Override
public String toString() {
return "AuthenticationDTO [username=" + username + ", password=" + password + "]";
}
}

Using Jsonobject, it converted my object to JSON:

AuthenticationDTO authenticationDTO = new AuthenticationDTO("admin", "admin");
JSONObject requestJsonAutentication = new JSONObject(authenticationDTO);
System.out.println(authenticationDTO.toString());

Returning my JSON: {"password":"admin","username":"admin"} I believe that the "_" may be influencing when converting, or the fields of your object are not with the correct names.

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