java如何在具有动态根键时反序列化JSON

Question

我面临着这个问题

{"1234345": [{
   "queue": "XXX",
   "name": "XXXXX",
   "entries": [{
   "points": 54,
   "isInactive": false,
   }],
   "tier": "ASDF"
}]}

但它也可以有这样的形状：

{
 "1234345": [{
  "queue": "XXX",
   "name": "XXXXX",
   "entries": [{
   "points": 54,
   "isInactive": false,
   }],
   "tier": "ASDF"
}],
 "22683144": [{
  "queue": "XXX",
   "name": "XXXXX",
   "entries": [{
   "points": 54,
   "isInactive": false,
   }],
   "tier": "ASDF"
  }]
}

根密钥是一个数组，它可以在每次调用服务时更改。因此，它是动态的

我对这件事很生气。我听说使用动态键的最佳选择是使用地图。但在本例中，如何命名将包含该映射的属性？在这个例子中，作为一个数组，我不知道它是否应该是一个映射，或者如何创建相应的POJO。有什么帮助吗

首先我要做的是为条目创建一个类

public class myEntry {
   public String points;
   public String isInactive;
}

然后是它的容器类

public class myObject {
   public String queue;
   public String name,
   public myEntry[] entries;
   public String tier;
}

但我被困在这里，我不知道如何继续

Answer 1

你总是可以用^{}。考虑你在你的问题中张贴的JSON：

{
  "1234345": [
    {
      "queue": "XXX",
      "name": "XXXXX",
      "entries": [
        {
          "points": 54,
          "isInactive": false
        }
      ],
      "tier": "ASDF"
    }
  ],
  "22683144": [
    {
      "queue": "XXX",
      "name": "XXXXX",
      "entries": [
        {
          "points": 54,
          "isInactive": false
        }
      ],
      "tier": "ASDF"
    }
  ]
}

使用流行的Java JSON解析器Jackson，可以将其解析为Map<String,Object>对象：

String json = "{\"1234345\":[{\"queue\":\"XXX\",\"name\":\"XXXXX\",\"entries\":["
            + "{\"points\":54,\"isInactive\":false}],\"tier\":\"ASDF\"}],"
            + "\"22683144\":[{\"queue\":\"XXX\",\"name\":\"XXXXX\",\"entries\":["
            + "{\"points\":54,\"isInactive\":false}],\"tier\":\"ASDF\"}]}";

ObjectMapper mapper = new ObjectMapper();
Map<String, Object> map = 
    mapper.readValue(json, new TypeReference<Map<String, Object>>() {});

您可以使用POJO代替^{}：

public class Foo {

    private String queue;
    private String name;
    private String tier;
    private List<Bar> entries;

    // Getters and setters omitted
}

public class Bar {

    private Integer points;
    private Boolean isInactive;

    // Getters and setters omitted
}

对于Jackson，您的代码如下：

String json = "{\"1234345\":[{\"queue\":\"XXX\",\"name\":\"XXXXX\",\"entries\":["
            + "{\"points\":54,\"isInactive\":false}],\"tier\":\"ASDF\"}],"
            + "\"22683144\":[{\"queue\":\"XXX\",\"name\":\"XXXXX\",\"entries\":["
            + "{\"points\":54,\"isInactive\":false}],\"tier\":\"ASDF\"}]}";

ObjectMapper mapper = new ObjectMapper();
Map<String, List<Foo>> map = 
    mapper.readValue(json, new TypeReference<Map<String, List<Foo>>>() {});