ejb

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EJB是sun的JavaEE服務器端組件模型,設計目標與核心應用是部署分佈式應用程序。簡單來說就是把已經編寫好的程序(即:類)打包放在服務器上執行。憑藉java跨平臺的優勢,用EJB技術部署的 分佈式系統 可以不限於特定的平臺。EJB (Enterprise JavaBean )是J2EE(javaEE)的一部分,定義了一個用於開發基於組件的企業多重應用程序的標準。其特點包括 網絡服務 支持和核心開發工具(SDK)。 在J2EE裏,Enterprise Java Beans(EJB)稱爲Java 企業Bean,是Java的核心代碼,分別是會話Bean(Session Bean),實體Bean(Entity Bean)和消息驅動Bean(MessageDriven Bean)。在EJB3.0推出以後,實體Bean被單獨分了出來,形成了新的規範 JPA

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