https://www.jianshu.com/p/9306406d069a
https://blog.csdn.net/u011644473/article/details/62037935
https://blog.csdn.net/u012422440/article/details/48860893
https://www.jianshu.com/p/9306406d069a
https://blog.csdn.net/u011644473/article/details/62037935
https://blog.csdn.net/u012422440/article/details/48860893
1.數據格式,三層泛型嵌套 String str = { "code": 0, "data": { "totalCount": 231, "itemCount": 100,