如何使用Jackson将JSON反序列化为Map object？

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.4</version>
</dependency>

import com.fasterxml.jackson.databind.ObjectMapper;

ObjectMapper objectMapper = new ObjectMapper();

String json = "{\"key1\":\"value1\",\"key2\":\"value2\"}";

try {
    Map<String, Object> map = objectMapper.readValue(json, new TypeReference<Map<String, Object>>() {});
    // 这里的TypeReference用于指定反序列化的目标类型，这里是Map<String, Object>
    
    // 对反序列化后的Map对象进行操作
    System.out.println(map.get("key1")); // 输出：value1
    System.out.println(map.get("key2")); // 输出：value2
} catch (IOException e) {
    e.printStackTrace();
}

public class CustomMap extends HashMap<String, Object> {
    // 自定义Map类
}

String json = "{\"key1\":\"value1\",\"key2\":\"value2\"}";

try {
    CustomMap customMap = objectMapper.readValue(json, new TypeReference<CustomMap>() {});
    // 这里的TypeReference用于指定反序列化的目标类型，这里是CustomMap
    
    // 对反序列化后的CustomMap对象进行操作
    System.out.println(customMap.get("key1")); // 输出：value1
    System.out.println(customMap.get("key2")); // 输出：value2
} catch (IOException e) {
    e.printStackTrace();
}