Mapping JSON into POJO using Gson

Question

I have the following JSON to represent the server response for a salt request: ``` { "USER": { "E_MAIL":"email", "SALT":"salt" }, "CODE":"010" } ``` And i tried to map it with the following POJO: ``` public class SaltPOJO { private String code = null; private User user = null; @Override public String toString() { return this.user.toString(); } public String getCode() { return code; } public void setCode(String code) { this.code = code; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } public class User { private String e_mail = null; private String salt = null; @Override public String toString() { return this.e_mail + ": " + this.salt; } public String getE_mail() { return e_mail; } public void setE_mail(String e_mail) { this.e_mail = e_mail; } public String getSalt() { return salt; } public void setSalt(String salt) { this.salt = salt; } } } ``` Now everytime i do this: ``` Gson gson = new Gson(); SaltPOJO saltPojo = gson.fromJson(json.toStr…

Accepted Answer

Is the order of my variables important for the Gson mapping?

No, that's not the case.

How can i map my JSON into POJO using Gson?

It's Case Sensitive and the keys in JSON string should be same as variable names used in POJO class.

You can use @SerializedName annotation to use any variable name as your like.

Sample code:

```
  class SaltPOJO {
        @SerializedName("CODE")
        private String code = null;
        @SerializedName("USER")
        private User user = null;
        ...

class User {
            @SerializedName("E_MAIL")
            private String e_mail = null;
            @SerializedName("SALT")
            private String salt = null;
```

Mapping JSON into POJO using Gson

Solution

Problem