Gson序列化內部類

在本章中，我們將解釋具有內部類的類的序列化/反序列化。

嵌套內部類示例

參考以下示例代碼片段 -

Student student = new Student();
student.setRollNo(1);
Student.Name name = student.new Name();
name.firstName = "Max";
name.lastName = "Su";

student.setName(name);
//serialize inner class object
String nameString = gson.toJson(name);
System.out.println(nameString);

//deserialize inner class object
name = gson.fromJson(nameString,Student.Name.class);
System.out.println(name.getClass());

示例

讓我們來看看一個內部類的序列化/反序列化。 創建一個名為GsonTester的Java類檔:GsonTester.java -

import com.google.gson.Gson;

public class GsonTester {
   public static void main(String args[]) {
      Student student = new Student();
      student.setRollNo(1);
      Student.Name name = student.new Name();

      name.firstName = "Mahesh";
      name.lastName = "Kumar";
      student.setName(name);
      Gson gson = new Gson();

      String jsonString = gson.toJson(student);
      System.out.println(jsonString);
      student = gson.fromJson(jsonString, Student.class);

      System.out.println("Roll No: "+ student.getRollNo());
      System.out.println("First Name: "+ student.getName().firstName);
      System.out.println("Last Name: "+ student.getName().lastName);

      String nameString = gson.toJson(name);
      System.out.println(nameString);

      name = gson.fromJson(nameString,Student.Name.class);
      System.out.println(name.getClass());
      System.out.println("First Name: "+ name.firstName);
      System.out.println("Last Name: "+ name.lastName);
   }
}
class Student {
   private int rollNo;
   private Name name;

   public int getRollNo() {
      return rollNo;
   }
   public void setRollNo(int rollNo) {
      this.rollNo = rollNo;
   }
   public Name getName() {
      return name;
   }
   public void setName(Name name) {
      this.name = name;
   }
   class Name {
      public String firstName;
      public String lastName;
   }
}

執行上面示例代碼，得到以下結果 -

{"rollNo":1,"name":{"firstName":"Max","lastName":"Su"}}
Roll No: 1
First Name: Max
Last Name: Su
{"firstName":"Max","lastName":"Su"}
class Student$Name
First Name: Max
Last Name: Su

嵌套的靜態內部類示例

參考以下代碼實現 -

Student student = new Student();
student.setRollNo(1);
Student.Name name = new Student.Name();

name.firstName = "Mahesh";
name.lastName = "Kumar";
student.setName(name);

//serialize static inner class object
String nameString = gson.toJson(name);
System.out.println(nameString);

//deserialize static inner class object
name = gson.fromJson(nameString,Student.Name.class);
System.out.println(name.getClass());

示例

我們來看一個實例，其中包含一個靜態內部類的序列化/反序列化。 創建一個名為GsonTester的Java類檔:GsonTester.java -

import com.google.gson.Gson;

public class GsonTester {
   public static void main(String args[]) {
      Student student = new Student();
      student.setRollNo(1);
      Student.Name name = new Student.Name();

      name.firstName = "Max";
      name.lastName = "Su";
      student.setName(name);

      Gson gson = new Gson();
      String jsonString = gson.toJson(student);
      System.out.println(jsonString);
      student = gson.fromJson(jsonString, Student.class);

      System.out.println("Roll No: "+ student.getRollNo());
      System.out.println("First Name: "+ student.getName().firstName);
      System.out.println("Last Name: "+ student.getName().lastName);
      String nameString = gson.toJson(name);
      System.out.println(nameString);

      name = gson.fromJson(nameString,Student.Name.class);
      System.out.println(name.getClass());
      System.out.println("First Name: "+ name.firstName);
      System.out.println("Last Name: "+ name.lastName);
   }
}
class Student {
   private int rollNo;
   private Name name;

   public int getRollNo() {
      return rollNo;
   }
   public void setRollNo(int rollNo) {
      this.rollNo = rollNo;
   }
   public Name getName() {
      return name;
   }
   public void setName(Name name) {
      this.name = name;
   }
   static class Name {
      public String firstName;
      public String lastName;
   }
}
Verify the resul

執行上面示例代碼，得到以下輸出結果 -

{"rollNo":1,"name":{"firstName":"Max","lastName":"Su"}}
Roll No: 1
First Name: Max
Last Name: Su
{"firstName":"Max","lastName":"Su"}
class Student$Name
First Name: Max
Last Name: Su