ejb

xmh_sxh_1314發表於2021-01-01

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EJB是sun的JavaEE伺服器端元件模型,設計目標與核心應用是部署分散式應用程式。簡單來說就是把已經編寫好的程式(即:類)打包放在伺服器上執行。憑藉java跨平臺的優勢,用EJB技術部署的 分散式系統 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元件的企業多重應用程式的標準。其特點包括 網路服務 支援和核心開發工具(SDK)。 在J2EE裡,Enterprise Java Beans(EJB)稱為Java 企業Bean,是Java的核心程式碼,分別是會話Bean(Session Bean),實體Bean(Entity Bean)和訊息驅動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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