Jackson2.x通用工具类
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2022-07-02 17:11:59
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import java.io.IOException; import java.text.SimpleDateFormat; import java.util.TimeZone; import org.apache.log4j.Logger; import com.fasterxml.jackson.annotation.JsonInclude.Include; import com.fasterxml.jackson.core.JsonGenerationException; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.core.type.TypeReference; import com.fasterxml.jackson.databind.DeserializationFeature; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.SerializationFeature; public class JsonUtils { private static Logger logger = Logger.getLogger(JsonUtils.class); private static final ObjectMapper objectMapper; static { objectMapper = new ObjectMapper(); //去掉默认的时间戳格式 objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false); //设置为中国上海时区 objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8")); objectMapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false); //空值不序列化 objectMapper.setSerializationInclusion(Include.NON_NULL); //反序列化时,属性不存在的兼容处理 objectMapper.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES); //序列化时,日期的统一格式 objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")); objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false); objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); //单引号处理 objectMapper.configure(com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_SINGLE_QUOTES, true); } public static <T> T toObject(String json, Class<T> clazz) { try { return objectMapper.readValue(json, clazz); } catch (JsonParseException e) { logger.error(e.getMessage(), e); } catch (JsonMappingException e) { logger.error(e.getMessage(), e); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static <T> String toJson(T entity) { try { return objectMapper.writeValueAsString(entity); } catch (JsonGenerationException e) { logger.error(e.getMessage(), e); } catch (JsonMappingException e) { logger.error(e.getMessage(), e); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static <T> T toCollection(String json, TypeReference<T> typeReference) { try { return objectMapper.readValue(json, typeReference); } catch (JsonParseException e) { logger.error(e.getMessage(), e); } catch (JsonMappingException e) { logger.error(e.getMessage(), e); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } }