tools.com.google.gson.annotations

Annotation Type SerializedName

@Documented
 @Retention(value=RUNTIME)
 @Target(value={FIELD,METHOD})
public @interface SerializedName

An annotation that indicates this member should be serialized to JSON with the provided name value as its field name.

This annotation will override any com.google.gson.FieldNamingPolicy, including the default field naming policy, that may have been set on the com.google.gson.Gson instance. A different naming policy can set using the GsonBuilder class. See com.google.gson.GsonBuilder#setFieldNamingPolicy(com.google.gson.FieldNamingPolicy) for more information.

Here is an example of how this annotation is meant to be used:

 public class MyClass {
   @SerializedName("name") String a;
   @SerializedName(value="name1", alternate={"name2", "name3"}) String b;
   String c;

   public MyClass(String a, String b, String c) {
     this.a = a;
     this.b = b;
     this.c = c;
   }
 }
 

The following shows the output that is generated when serializing an instance of the above example class:

 MyClass target = new MyClass("v1", "v2", "v3");
 Gson gson = new Gson();
 String json = gson.toJson(target);
 System.out.println(json);

 ===== OUTPUT =====
 {"name":"v1","name1":"v2","c":"v3"}
 

NOTE: The value you specify in this annotation must be a valid JSON field name.

While deserializing, all values specified in the annotation will be deserialized into the field. For example:

   MyClass target = gson.fromJson("{'name1':'v1'}", MyClass.class);
   assertEquals("v1", target.b);
   target = gson.fromJson("{'name2':'v2'}", MyClass.class);
   assertEquals("v2", target.b);
   target = gson.fromJson("{'name3':'v3'}", MyClass.class);
   assertEquals("v3", target.b);
 

Note that MyClass.b is now deserialized from either name1, name2 or name3.

Author:

Inderjeet Singh, Joel Leitch

See Also:

com.google.gson.FieldNamingPolicy

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
java.lang.String	value

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
java.lang.String[]	alternate

Element Detail

value

public abstract java.lang.String value

Returns:

the desired name of the field when it is serialized or deserialized

alternate

public abstract java.lang.String[] alternate

Returns:

the alternative names of the field when it is deserialized

Default:

{}