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

问题描述

我有这个模式：

  public class Student {
 public String name; 
公立学校; 
} 
 
 public class School {
 public int id; 
公共字符串名称; 
} 
 public class Data {
 public ArrayList< Student>学生们; 
 public ArrayList< School>学校; 
} 
  

我想用Gson序列化Data对象，并得到如下所示的内容：

  {students：[{
name：name1，
school ：1//该scool的id，而不是它的整个Json 
}]，
school：[{//整个JSON 
id：1， 
name：schoolName
}] 
} 
  

为了达到这个目的，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。但是对于学校来说，我必须有正常的序列化程序。

我怎样才能用一个Gson对象做所有事情？

  public class StudentAdapter  
 
实现了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; 
} 
} 
  

I have this schema :

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;
}

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"
            }]
}

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.

How can I do everything with only one Gson object ?

解决方案

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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