详解Java中JSON数据的生成与解析

{

"name":"自控力"，

"info":"如何提升自己的自控力"

}

public class Book {

    private String id;
    private String name;
    private String info;
    
    @Override
    public String toString() {
        return "Book{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", info='" + info + '\'' +
                '}';
    }
    
    public Book(String id, String name, String info) {
        this.id = id;
        this.name = name;
        this.info = info;
    }
    
    public Book() {
    }
    
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Book book = (Book) o;
        return Objects.equals(id, book.id) &&
                Objects.equals(name, book.name) &&
                Objects.equals(info, book.info);
    }
    
    @Override
    public int hashCode() {
        return Objects.hash(id, name, info);
    }
    
    public String getId() {
        return id;
    }
    
    public void setId(String id) {
        this.id = id;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    public String getInfo() {
        return info;
    }
    
    public void setInfo(String info) {
        this.info = info;
    }

}

public class toJSON {

    public static void main(String[] args) {
        //1. 创建Gson对象
        Gson g = new Gson();
        //2. 转换
        Book b = new Book("10","自控力","如何提升自控力");
        String s = g.toJson(b);
        System.out.println(s);
    }

}
输出结过为：
{"id":"10","name":"自控力","info":"如何提升自控力"}

public class toBook {

    public static void main(String[] args) {
        //1.    创建Gson对象
        Gson g = new Gson();
        //2.    转换  :  {"id":"10","name":"自控力","info":"如何提升自控力"}
        Book b = g.fromJson("{\"id\":\"10\",\"name\":\"自控力\",\"info\":\"如何提升自控力\"}", Book.class);
        System.out.println(b.getId());
    }
}
结果：
10

public class toMap{

    public static void main(String[] args) {
        //1.    创建Gson对象
        Gson g = new Gson();
        //2.    转换  
        HashMap data = g.fromJson("{\"id\":\"10\",\"name\":\"自控力\",\"info\":\"如何提升自控力\", \"page\":[\"时间管控方式\",\"自我暗示法\"]}"HashMap.class);
        List page=(List) data.get("page");
        System.out.println(data.get("id"));
        System.out.println(page.get("1"));
    }

}
运行结果：
10
时间管控方式