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在过去一年中,Web应用服务器和其他一些中间层产品已经取得了全方位的发展。在三层应用环境中,应用服务器扮演着控制事务逻辑层的角色,而且这一市场发展状况良好。面向企业的web应用服务器通常提供成熟的系统层服务,如在多个主机之间提供应用负载平衡和故障自动恢复,他们通常包括会话和事务的保存和回卷,以保证用户的在线事务处理不会丢
In the past year, Web application servers and other middle-tier products have been developed in all directions. In a three-tier application environment, application servers act as the logical layer of control transactions and the market is in good shape. Enterprise-oriented web application servers typically provide sophisticated system-level services such as application load balancing and automatic fault recovery across multiple hosts, which typically include the saving and rewinding of sessions and transactions to ensure that users’ online transactions do not Will lose