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BankSystem
BankSystem Public由于引入多线程环境:开始的业务层单例是一个以时间换取空间的策略。先在业务多个用户登录,业务层处理存在排队现象 现在业务层取消单例,让每个用户拥有独有的业务服务 问题: 1.一个账号多人请求登录,出现多账号在线。应用dao层对象池保存登录用户信息HashMap<username,userFile> - dao层注册于登录前需要先判断user_pool while(uers.get(userna…
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