java - 将 JSON 数据转换为 Java 对象列表

Question

我有这样的 JSON 数据:

[ {
    "data": "data",
    "what": "what2",
    "when": 1392046352,
    "id": 13,
    "tags": "checkid:testcheckid, target:server.id.test, id:testid"
}, {
    "data": "Test",
    "what": "Test",
    "when": 1395350977,
    "id": 5,
    "tags": "checkid:testcheckid, target:server.id.test, id:testid"
} ]

我有一个 Java 类，我想将此 JSON 转换为我的类的实例列表。我找到了如何转换单个对象，但不是列表。

Answer 1

与 Jackson你会做类似的事情:

String jsonStr = "...";
ObjectReader reader = new ObjectMapper().reader();
List<Map<String, Object>> objs = reader.readValue(jsonStr);

Map<String, Object> myFirstObj = objs.get(0);
myFirstObj.get("data");
myFirstObj.get("what");
// and so on

或者更好的是，您可以创建一个 pojo 并执行以下操作:

String jsonStr = "...";
ObjectMapper mapper = new ObjectMapper();
List<MyPojo> myObjs = mapper.readValue(jsonStr, new TypeReference<List<MyPojo>>() {});
MyPojo myPojo = myObjs.get(0);
myPojo.getData();
myPojo.getWhat();
// and so on