private static boolean i(Object obj){
        if(obj==null|| h.contains(obj)){
            return true;
        }
        h.add(obj);
        return false;
    }
@ClassName: dfs
@Description: TODO
@Author: Summer
@Date: 2021/12/9 13:45
@Version: v1.0.0
@Description:
src/main/java/com/summersec/attack/deser/echo/dfs.java