如何忽略Android Retrofit中的JSON元素

Question

我正在开发一个使用Android Retrofit发送JSON的Android应用程序(它在JSON中转换POJO类).它工作正常,但我需要忽略从POJO类发送JSON一个元素.

有谁知道任何Android Retrofit注释？

例

POJO课程:

public class sendingPojo
{
   long id;
   String text1;
   String text2;//--> I want to ignore that in the JSON

   getId(){return id;}
   setId(long id){
     this.id = id;
   }

   getText1(){return text1;}
   setText1(String text1){
     this.text1 = text1;
   }

   getText2(){return text2;}
   setText2(String text2){
     this.text2 = text2;
   }


}

接口发件人ApiClass

 public interface SvcApi {

 @POST(SENDINGPOJO_SVC_PATH)
 public sendingPojo addsendingPojo(@Body sendingPojo sp);

}

知道如何忽略text2吗？

Answer 1

如果你不想使用,我找到了另一种解决方案new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create().

只包含transient在我需要忽略的变量中.

所以,POJO课最后:

public class sendingPojo {
    long id;
    String text1;
    transient String text2;//--> I want to ignore that in the JSON

    getId() {
        return id;
    }

    setId(long id) {
        this.id = id;
    }

    getText1() {
        return text1;
    }

    setText1(String text1) {
        this.text1 = text1;
    }

    getText2() {
        return text2;
    }

    setText2(String text2) {
        this.text2 = text2;
    }
}

我希望它有所帮助

Answer 2

使用@Expose注释标记所需的字段,例如:

@Expose private String id;

省去您不想序列化的任何字段.然后以这种方式创建您的Gson对象:

Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();

Answer 3

您可以通过将GSONBuilder中的GSON对象添加到ConverterFactory来配置Retrofit,请参阅下面的示例:

private static UsuarioService getUsuarioService(String url) {
    return new Retrofit.Builder().client(getClient()).baseUrl(url)
            .addConverterFactory(GsonConverterFactory.create(getGson())).build()
            .create(UsuarioService.class);
}

private static OkHttpClient getClient() {
    return new OkHttpClient.Builder().connectTimeout(5, MINUTES).readTimeout(5, MINUTES)
            .build();
}

private static Gson getGson() {
    return new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
}

要忽略字段元素,只需将@Expose(deserialize = false,serialize = false)添加到属性或不添加,并且对于(de)序列化字段元素,可以将带有空值的@Expose()注释添加到属性中.

@Entity(indexes = {
        @Index(value = "id DESC", unique = true)
})
public class Usuario {

    @Id(autoincrement = true)
    @Expose(deserialize = false, serialize = false) 
    private Long pkey; // <- Ignored in JSON
    private Long id; // <- Ignored in JSON, no @Expose annotation
    @Index(unique = true)
    @Expose
    private String guid; // <- Only this field will be shown in JSON.