Maven依赖:
<dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-avro</artifactId> <version>2.9.0</version> </dependency> <!-- 如果使用@Slf4j 注解,需要引入lombok依赖 --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.16.18</version> </dependency>
工具栏实现:
@Slf4j public class JsonUtil { public static ObjectMapper objectMapper = new ObjectMapper(); static { //***********************序列化**************************** //对象的所有字段全部列入 objectMapper.setSerializationInclusion(Inclusion.ALWAYS); //取消默认转换timestamps objectMapper.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false); //忽略空Bean转json的错误 objectMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false); //同意日期格式为:"yyyy-MM-dd HH:mm:ss" objectMapper.setDateFormat(new SimpleDateFormat(DateTimeUtil.STANDARD_FORMAT)); //***********************序列化**************************** //***********************反序列化**************************** //忽略 在json字符串中存在,但是java对象中不存在对应属性的情况,防止错误。 objectMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false); //***********************反序列化**************************** } /** * Object转json字符串 * * @param obj * @param <T> * @return */ public static <T> String obj2String(T obj) { if (obj == null) { return null; } try { return obj instanceof String ? (String) obj : objectMapper.writeValueAsString(obj); } catch (Exception e) { log.warn("Parse object to String error", e); return null; } } /** * Object转json字符串 将转换的json结果格式化 * * @param obj * @param <T> * @return */ public static <T> String obj2StringPretty(T obj) { if (obj == null) { return null; } try { return obj instanceof String ? (String) obj : objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj); } catch (Exception e) { log.warn("Parse object to String error", e); return null; } } /** * String转Object * * @param str * @param clazz Object类型 * @param <T> * @return */ public static <T> T string2Obj(String str, Class<T> clazz) { if (StringUtil.isEmpty(str) || clazz == null) { return null; } try { return clazz.equals(String.class) ? (T) str : objectMapper.readValue(str, clazz); } catch (Exception e) { log.warn("Parse String to object error", e); return null; } } /** * String转Object 适用于多泛型 eg: 将String转换成 Map<UserClass,CourseClass> * * @param str * @param typeReference Map<Class1,Class2> * @param <T> * @return TypeReference 导入包:import org.codehaus.jackson.type.TypeReference; */ public static <T> T string2Obj(String str, TypeReference<T> typeReference) { if (StringUtil.isEmpty(str) || typeReference == null) { return null; } try { return (T) (typeReference.getType().equals(String.class) ? (T) str : objectMapper.readValue(str, typeReference)); } catch (Exception e) { log.warn("Parse String to object error", e); return null; } } /** * String转Object 使用存在Collection集合 eg:将String转换成List<UserClass> * * @param str * @param collectionClass 集合类型 * @param elementClasses 集合中对象类型,多个对象类型时传入数组 * @param <T> * @return */ public static <T> T string2Obj(String str, Class<?> collectionClass, Class<?>... elementClasses) { JavaType javaType = objectMapper.getTypeFactory().constructParametricType(collectionClass, elementClasses); try { return objectMapper.readValue(str, javaType); } catch (Exception e) { log.warn("Parse String to object error", e); return null; } } }