[jackson 工具函数] #jackson

JacksonUtils.java

private final static ObjectMapper OBJECT_MAPPER=new ObjectMapper();

static {
  OBJECT_MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);
  OBJECT_MAPPER.configure(SerializationFeature.INDENT_OUTPUT, Boolean.TRUE);
  OBJECT_MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
}

/**
 * <p>
 * 对象转JSON字符串
 * </p>
 */
public static String object2Json(Object obj) {
  try {
    String string = OBJECT_MAPPER.writeValueAsString(object);
    return string;
  } catch (JsonProcessingException e) {
    log.error("在序列化对象为json字符串时遇到错误",e);
    return "";
  }
}

public static Map object2Map(Object obj) {
  String object2Json = object2Json(obj);
  Map<?, ?> result = jsonToMap(object2Json);
  return result;
}

/**
 * <p>
 * JSON字符串转Map对象
 * </p>
 */
public static Map<?, ?> jsonToMap(String json) {
  return json2Object(json, Map.class);
}

/**
 * <p>
 * JSON转Object对象
 * </p>
 */
public static <T> T json2Object(String json, Class<T> cls) {
  T result = null;
  try {
    result = OBJECT_MAPPER.readValue(json, cls);
  } catch (IOException e) {
    log.error("在将json字符串反序列化时遇到错误",e);
  }

  return result;
}