如何为Json Schema编写Java模型类

Question

问题出在类似coach、goalkeepers和defender的实体上我不知道如何为这种响应创建一个类

{
"squad": [
[
"coach",
[
{
"id": 78621,
"name": "Gareth Southgate",
"ccode": "ENG",
"cname": "England"
}
]
],
[
"goalkeepers",
[
{
"id": 280287,
"name": "Sam Johnstone",
"ccode": "8659",
"cname": "West Bromwich Albion",
"role": "goalkeepers"
},
{
"id": 303919,
"name": "Jordan Pickford",
"ccode": "8668",
"cname": "Everton",
"role": "goalkeepers"
},
{
"id": 746395,
"name": "Aaron Ramsdale",
"ccode": "8657",
"cname": "Sheffield United",
"role": "goalkeepers"
}
]
],
[
"defenders",
[
{
"id": 159833,
"name": "Kyle Walker",
"ccode": "8456",
"cname": "Manchester City",
"role": "defenders"
},
{
"id": 191869,
"name": "Kieran Trippier",
"ccode": "9906",
"cname": "Atletico Madrid",
"role": "defenders"
},
{
"id": 247761,
"name": "Conor Coady",
"ccode": "8602",
"cname": "Wolverhampton Wanderers",
"role": "defenders"
},
{
"id": 255610,
"name": "Harry Maguire",
"ccode": "10260",
"cname": "Manchester United",
"role": "defenders"
},
{
"id": 263653,
"name": "John Stones",
"ccode": "8456",
"cname": "Manchester City",
"role": "defenders"
},
{
"id": 362694,
"name": "Luke Shaw",
"ccode": "10260",
"cname": "Manchester United",
"role": "defenders"
},
{
"id": 419664,
"name": "Tyrone Mings",
"ccode": "10252",
"cname": "Aston Villa",
"role": "defenders"
},
{
"id": 672469,
"name": "Ben Chilwell",
"ccode": "8455",
"cname": "Chelsea",
"role": "defenders"
},
{
"id": 776151,
"name": "Ben White",
"ccode": "10204",
"cname": "Brighton & Hove Albion",
"role": "defenders"
},
{
"id": 807729,
"name": "Reece James",
"ccode": "8455",
"cname": "Chelsea",
"role": "defenders"
}
]
],
[
"midfielders",
[
{
"id": 156008,
"name": "Jordan Henderson",
"ccode": "8650",
"cname": "Liverpool",
"role": "midfielders"
},
{
"id": 609755,
"name": "Kalvin Phillips",
"ccode": "8463",
"cname": "Leeds United",
"role": "midfielders"
},
{
"id": 654096,
"name": "Declan Rice",
"ccode": "8654",
"cname": "West Ham United",
"role": "midfielders"
},
{
"id": 750032,
"name": "Mason Mount",
"ccode": "8455",
"cname": "Chelsea",
"role": "midfielders"
},
{
"id": 1077894,
"name": "Jude Bellingham",
"ccode": "9789",
"cname": "Borussia Dortmund",
"role": "midfielders"
}
]
],
[
"attackers",
[
{
"id": 194165,
"name": "Harry Kane",
"ccode": "8586",
"cname": "Tottenham Hotspur",
"role": "attackers"
},
{
"id": 246575,
"name": "Raheem Sterling",
"ccode": "8456",
"cname": "Manchester City",
"role": "attackers"
},
{
"id": 312765,
"name": "Jack Grealish",
"ccode": "10252",
"cname": "Aston Villa",
"role": "attackers"
},
{
"id": 612150,
"name": "Dominic Calvert-Lewin",
"ccode": "8668",
"cname": "Everton",
"role": "attackers"
},
{
"id": 696365,
"name": "Marcus Rashford",
"ccode": "10260",
"cname": "Manchester United",
"role": "attackers"
},
{
"id": 815006,
"name": "Phil Foden",
"ccode": "8456",
"cname": "Manchester City",
"role": "attackers"
},
{
"id": 846381,
"name": "Jadon Sancho",
"ccode": "9789",
"cname": "Borussia Dortmund",
"role": "attackers"
},
{
"id": 961995,
"name": "Bukayo Saka",
"ccode": "9825",
"cname": "Arsenal",
"role": "attackers"
}
]
]
]
}

Answer 1

为json模式创建Java POJO时，只需要映射字段。对于你的问题，我们可以这样做。

public class SquadDto{
List<Squad> squads;
}
public class Squad{
List<Coach> coach;
List<Goalkeeper> goalkeepers;
List<Defender> defenders;
List<Midfielder> midfielders;
List<Attacker> attackers;
}
public class Coach{
long id;
String name;
String ccode;
String cname;
String role;
}

类似地，我们可以为GoalKeeper创建类，以便它们在JSON中映射字段。

Answer 2

1-熟悉数组和对象2-关于json格式的知识3-如果一个数组将其保存在一个集合中，并且对象将是该集合的一部分。

4-https://www.jsonschema2pojo.org/链接可能会在初始阶段帮助您

Answer 3

如果您知道收到的JSON文件总是正确格式化的，那么您可以使用上面Karamvier的响应。

如果没有，只需使用类似Jackson、Gson、json-io或Genson的东西来解析您收到的json文件。

然后，您可以使用JavaPoet生成具有给定JSON值的类。