public class JsonUtils {

    // 定義jackson物件
private static final ObjectMapper MAPPER = new ObjectMapper();
/**
     * 將物件轉換成json字串。
* <p>Title: pojoToJson</p>
* <p>Description: </p>
* @param data
* @return
*/
public static String objectToJson(Object data) {
       try {
         String string = MAPPER
 
.writeValueAsString(data);
         return string;
} catch (JsonProcessingException e) {
         e.printStackTrace();
}
       return null;
}
    
    /**
     * 將json結果集轉化為物件
* 
     * @param jsonData json資料
* @param clazz 物件中的object型別
* @return
*/
public static <T> T jsonToPojo(String jsonData, 
 
Class<T> beanType) {
        try {
            T t = MAPPER.readValue(jsonData, beanType);
            return t;
} catch (Exception e) {
           e.printStackTrace();
}
        return null;
}
    
    /**
     * 將json資料轉換成pojo物件list
     * <p>Title: jsonToList</p>
* <p>Description: 
 
</p>
* @param jsonData
* @param beanType
* @return
*/
public static <T> List<T> jsonToList(String jsonData, Class<T> beanType) {
       JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
       try {
          List<T> list = MAPPER.readValue(jsonData, javaType);
          return list;
} catch (Exception e) {
         e.printStackTrace();
}
       
       return null;
}
    
}