<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>1.2.83</version>
</dependency>

Student o = JSONObject.parseObject(jsonString, Student.class);

List<Student> studentList = JSONObject.parseArray(jsonString, Student.class);

String jsonString = “[[1,"zhangsan","male",18,"Beijing"],[2,"lisi","female",18,"Shanghai"]]”
List<List<Object>> list = JSON.parseObject([jsonString], new TypeReference<List<List<Object>>>() {});

JSON.toJSONString(user);

JSON.toJSONString(users);

String json = "";
JSONObject jsonObject = JSON.parseObject(json);

jsonObject.getString(key);

JSONObject jsonObject = JSON.parseObject(json);
// 獲取到我們的jsonobject參數(shù)，并toJSONString
String s = JSONArray.toJSONString(jsonObject.get("servers"));
// 將json字符串轉(zhuǎn)換為集合對象（實體類就省略了?。?
List<AnswerCardVo> cardVos = JSONArray.parseArray(s, AnswerCardVo.class);

Map map1 = new HashMap();
        map1.put("one",users1);
        map1.put("two",users1);
        JSONObject mapJsonObject =(JSONObject) JSONObject.toJSON(map1);
        System.out.println(mapJsonObject);

{
"count": 3,
"servers": [{
"fault": null,
"id": "5c1ac257-",
"OS-EXT-STS:task_state": null,
"cpu_options": {
"hw:cpu_threads": null
}
}]
}

public class HwInstance {

private String fault;

private String id;

@JsonProperty("OS-EXT-STS:task_state")
private String state;
@JsonProperty("cpu_options")
private Object options;
}

@Autowired
private ObjectMapper objectMapper;
String json = "";
JSONObject jsonObject = JSON.parseObject(json);
JavaType javaType = objectMapper.getTypeFactory().constructParametricType(ArrayList.class, HwInstance.class);
List<HwInstance> instances = objectMapper.readValue(objectMapper.readTree(jsonObject.toJSONString()).get("servers").toString(), javaType);

@Autowired
private ObjectMapper objectMapper;
String json = "";
List<HwInstance> instances = objectMapper.readValue(objectMapper.readTree(json).get("servers").toString(),new TypeReference<List<HwInstance>>(){});

objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

@JsonIgnoreProperties(ignoreUnknown = true)