GSON - 特定情况下的自定义序列化程序 [英] GSON - Custom serializer in specific case

问题描述

我有这个架构:

public class Student {
       public String name;
       public School school;
}

public class School {
       public int id;
       public String name;
}
public class Data {
      public ArrayList<Student> students;
      public ArrayList<School> schools;
}

我想用 Gson 序列化 Data 对象，并得到类似的东西:

I would like to serialize the Data object with Gson, and get something like :

{ "students": [{ 
                 "name":"name1",
                 "school": "1"          //the id of the scool, not its entire Json
              }],
  "school": [{                        //the entire JSON
              "id" : "1",
              "name": "schoolName"
            }]
}

为了做到这一点，我必须为学生部分使用自定义序列化程序，以便 Gson 只打印学校的 id.但是对于学校，我必须有正常的序列化程序.

To make that, I must use custom serializer for the student part, so that Gson only print the id of the School. But for the School, I have to have nomal serializer.

如何只用一个 Gson 对象做所有事情?

How can I do everything with only one Gson object ?

推荐答案

你可以像这样编写自定义序列化器:

You can write a custom serializer something like this:

public class StudentAdapter implements JsonSerializer<Student> {

 @Override
 public JsonElement serialize(Student src, Type typeOfSrc,
            JsonSerializationContext context) {

        JsonObject obj = new JsonObject();
        obj.addProperty("name", src.name);
        obj.addProperty("school", src.school.id);

        return obj;
    }
}

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