一、前言随着计算机技术迅速发展,特别是Internet出现,使计算机的应用范围更为广阔,许多应用程序需在网络环境的异构平台上运行。这一切都对新一代的软件开发提出了新的需求。在这种分布异构环境中,如何把这些系统集成起来并开发新的应用是一个非常现实而困难的问题。为解决分布异构问题,要应用到中间件-位于平台和应用之间 I. INTRODUCTION With the rapid development of computer technology, especially the emergence of the Internet, the application of computers has become more widespread. Many applications need to be run on heterogeneous platforms in the network environment. All this put forward new needs for the new generation of software development. In this distributed heterogeneous environment, how to integrate these systems and develop new applications is a very real and difficult issue. To solve the problem of distribution heterogeneity, to be applied to middleware - located between the platform and the application