Gson如何序列化内部类

2020-11-02 15:09:00 作者：一点教程

本文介绍如何使用Gson对成员内部类及静态内部类进行序列化/反序列化，帮助大家更好的理解和使用gson库，感兴趣的朋友可以了解下

1 Gson处理成员内部类

1.1 编写核心类

MainApp：

package com.yiidian.gson;

import com.google.gson.Gson;

public class MainApp {

  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();

    //序列化
    String jsonString = gson.toJson(student);
    System.out.println(jsonString);
    //反序列化
    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;
  }

  //成员内部类
  class Name {
    public String firstName;
    public String lastName;
  }
}

1.2 运行测试

2 Gson处理静态内部类

2.1 编写核心类

MainApp：

package com.yiidian.gson;

import com.google.gson.Gson;


public class MainApp {

  public static void main(String args[]) {

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

  //静态内部类
  static class Name {
    public String firstName;
    public String lastName;
  }
}

2.2 运行测试

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Gson如何序列化内部类

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