common_helper/src/main/java/com/xiongyingqi/jackson/helper/ThreadJacksonMixInHolder.java
public static org.codehaus.jackson.map.ObjectMapper builderCodehausMapper() {
        ThreadJacksonMixInHolder holder = holderThreadLocal.get();
        if (holder.codehausMapper == null && isContainsMixIn()) {
            holder.codehausMapper = new org.codehaus.jackson.map.ObjectMapper();
            for (Map.Entry<Class<?>, Class<?>> mixIn : holder.mixIns) {
                holder.codehausMapper.getDeserializationConfig().addMixInAnnotations(mixIn.getKey(), mixIn.getValue());
                holder.codehausMapper.getSerializationConfig().addMixInAnnotations(mixIn.getKey(), mixIn.getValue());
            }
        }
        clear();// 如果不调用clear可能导致线程内的数据是脏的！
        return holder.codehausMapper;
    }
public static org.codehaus.jackson.map.ObjectMapper builderCodehausMapper() {
        ThreadJacksonMixInHolder holder = holderThreadLocal.get();
        if (holder.codehausMapper == null && isContainsMixIn()) {
            holder.codehausMapper = new org.codehaus.jackson.map.ObjectMapper();
            for (Map.Entry<Class<?>, Class<?>> mixIn : holder.mixIns) {
                holder.codehausMapper.getDeserializationConfig().addMixInAnnotations(mixIn.getKey(), mixIn.getValue());
                holder.codehausMapper.getSerializationConfig().addMixInAnnotations(mixIn.getKey(), mixIn.getValue());
            }
        }
        clear();// 如果不调用clear可能导致线程内的数据是脏的！
        return holder.codehausMapper;
    }
根据当前MixIn集合生成objectMapper

@return