import java.io.IOException;        import com.alibaba.fastjson.JSON;    import com.fasterxml.jackson.core.JsonParser;    import com.fasterxml.jackson.databind.JsonNode;    import com.fasterxml.jackson.databind.ObjectMapper;        public class JsonUtil {                /**        * 将字符串转成实体类，允许斜杠等字符串        */        public static <T> T jsonToEntity(String json, Class<T> clazz) throws IOException {            ObjectMapper mapper = new ObjectMapper();            // 允许反斜杆等字符            mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,true);            return mapper.readValue(json, clazz);        }                /**        * 实体类转JSON字符串        */        public static String entityToJson(Object entity){            return JSON.toJSONString(entity);        }                /**        * 将字符串转成JsonNode，允许斜杠等字符串        */        public static JsonNode jsonToJsonNode(String json) throws IOException {            ObjectMapper mapper = new ObjectMapper();            // 允许反斜杆等字符            mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,true);            //允许单引号            mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES,true);            return mapper.readValue(json, JsonNode.class);        }                public static <T> String objectToJson(Object object, Class<T> cls)throws Exception {            ObjectMapper mapper = new ObjectMapper();            mapper.registerSubtypes(cls);            String reqJson = mapper.writeValueAsString(object);            return reqJson;        }            }