【正文】 gest online marketplace. eBay uses Java almost everywhere. To address some security issues, eBay chose Sun Microsystems39。s power and capabilities. Java is now an open standard, meaning that no single entity controls its development and the tools for writing programs in the language are available to everyone. The power of open standards like Java is the ability to break down barriers and speed up progress. Today, you can find Java technology in works and devices that range from the Inter and scientific superputers to laptops and cell phones, from Wall Street market simulators to 畢業(yè)設(shè)計（論文） 2 home game players and credit cards. There are over 3 million Java developers and now there are several versions of the code. Most large corporations have inhouse Java developers. In addition, the majority of key software vendors use Java in their mercial applications (Lazaridis, 2020). Applications Java on the World Wide Web Java has found a place on some of the most popular websites in the world and the uses of Java continues to grow. Java applications not only provide unique user interfaces, they also help to power the backend of websites. Everybody is probably familiar with eBay and Amazon have been Java pioneers on the World Wide Web. eBay Founded in 1995, eBay enables emerce on a local, national and international basis with an array of Web can find it on eBay, even if you didn39。 Access Data stored in existing applications can be accessed with specialized connectors. Integration and interoperability of these data sources is further enabled by the metadata repository that contains metamodels of the data contained in the sources, which then can be accessed and interchanged uniformly via the JMI API. These metamodels capture the essential structure and semantics of business ponents, allowing them to be accessed and queried via the JMI API or to be interchanged via XML. Through all of these processes, the J2EE infrastructure ensures the security and integrity of the data through transaction management and propagation and the underlying security architecture. To consolidate historical information for analysis of sales and marketing trends, a data warehouse is often the best solution. In this example, data can be extracted from the operational systems with a variety of Extract, Transform and Load tools (ETL). The metamodels allow EJBs designed for filtering, transformation, and consolidation of data to operate uniformly on data from diverse data sources as the bean is able to query the metamodel to identify and extract the pertinent fields. Queries and reports can be run against the data warehouse that contains 畢業(yè)設(shè)計（論文） 5 information from numerous sources in a consistent, enterprisewide fashion through the use of the JMI API. Java in Industrial Settings Many people know Java only as a tool on the World Wide Web that enables sites to perform some of their fancier functions such as interactivity and animation. However, the actual uses for Java are much more widespread. Since Java is an objectoriented language, the time needed for application development is minimal. In addition, Java39。 Java 的應(yīng)用 Java 使用許多熟悉的編程概念和結(jié)構(gòu)，通過外部 Java 虛擬機 (JVM)為 便攜性提供了一個共同的接口。 Java 開放標準 能夠打破開放源代碼的 障礙 ，加快了發(fā)展 速度 。甚至有時候一天當中，在 eBay 上列出了數(shù)以萬計類別的 超過 100 萬件 的物品。 使用 Java 應(yīng)用程序，搜索亞馬遜圖書目錄主題 來 匹配用戶選擇的主題。 該技術(shù) 的主要 挑戰(zhàn) 是 整合不同的數(shù)據(jù)格式 、 平臺和 應(yīng)用程序。開發(fā)者可以使用這個架構(gòu)為用戶提供意見。使用的 EJB 架構(gòu)編寫的應(yīng)用程序 具有 可擴展性、事務(wù)性、安全和多用戶的了解。在這個例子中，數(shù)據(jù)可以被提取的業(yè)務(wù)系統(tǒng)與不同的抽取 、 轉(zhuǎn)換和加載工具 (ETL)， 允許EJBs 的 metamodels 設(shè)計的過濾 、 轉(zhuǎn)化和鞏固統(tǒng)一的數(shù)據(jù)操作的數(shù)據(jù)來自不同數(shù)據(jù)源的豆