Gson @SerializedName注解使用说明

前言

1. @SerializedName

1.1。注释属性

• value - 序列化或反序列化时字段的所需名称。
• alternate - 反序列化时字段的替代名称。除了'value'属性之外，它还提供了更多可能的名称。如果有多个字段与一个属性匹配，Gson将使用最后处理的字段。

请记住，alternate具有多个名称的选项仅限于反序列化。在序列化中，它不会产生任何影响。

2.在序列化期间更改字段名称

$title(Employee.java)
public class Employee
{
    private Integer id;
    private String firstName;
    private String lastName;
 
    @SerializedName(value = "emailId", alternate = "emailAddress")
    private String email;
}

$title(Main.java)
Employee emp = new Employee(1001, "Lokesh", "Gupta", "howtodoinjava@gmail.com");
 
Gson gson = new GsonBuilder().setPrettyPrinting().create(); 
 
System.out.println(gson.toJson(emp));

{
  "id": 1001,
  "firstName": "Lokesh",
  "lastName": "Gupta",
  "emailId": "howtodoinjava@gmail.com"
}

3.在反序列化期间更改字段名称

{
  "id": 1001,
  "firstName": "Lokesh",
  "lastName": "Gupta",
  "email": "howtodoinjava@gmail.com",
  "emailAddress": "admin@gmail.com"
}

$title(Main.java)
String json = "{'id': 1001,"
        + "'firstName': 'Lokesh',"
        + "'lastName': 'Gupta',"
        + "'email': 'howtodoinjava@gmail.com',"
        + "'emailAddress': 'admin@gmail.com'}";
         
Gson gson = new GsonBuilder().setPrettyPrinting().create();
 
Employee emp = gson.fromJson(json, Employee.class);
 
System.out.println(emp);

Employee [id=1001, firstName=Lokesh, lastName=Gupta, email=admin@gmail.com]

GSON Java

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