无法与杰克逊一起工作

使用这些依赖项 jackson-databind


jackson-annotations


jackson-
core

public class JsonTest {    public static void main(String[] args) throws JsonProcessingException {    ObjectMapper mapper=new ObjectMapper();    Map<String,String> dt=new Hashtable();    dt.put("1", "welcome");    dt.put("2", "bye");    String jsonString = mapper.writevalueAsString(dt)    System.out.println(jsonString);    }    }