glossary.html

j2eePDF格式的电子书

</p>
<a name="wp105065"> </a><p class="pDefinition">
A <a  href="Glossary.html#wp105529" target="_blank">JMS administered object</a> that encapsulates the identity of a JMS queue or topic. See <span style="font-style: italic"><a  href="Glossary.html#wp105908" target="_blank">point-to-point messaging system</a></span>, <span style="font-style: italic"><a  href="Glossary.html#wp105918" target="_blank">publish/subscribe messaging system</a></span>.
</p>
<a name="wp88675"> </a><p class="pDefinitionTerm">
digest authentication 
</p>
<a name="wp88676"> </a><p class="pDefinition">
An authentication mechanism in which a Web application authenticates to a Web server by sending the server a message digest along with its HTTP request message. The digest is computed by employing a one-way hash algorithm to a concatenation of the HTTP request message and the client's password. The digest is typically much smaller than the HTTP request, and doesn't contain the password.
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<a name="wp88677"> </a><p class="pDefinitionTerm">
distributed application 
</p>
<a name="wp88678"> </a><p class="pDefinition">
An application made up of distinct components running in separate runtime environments, usually on different platforms connected via a network. Typical distributed applications are two-tier (client-server), three-tier (client-middleware-server), and multitier (client-multiple middleware-multiple servers). 
</p>
<a name="wp88679"> </a><p class="pDefinitionTerm">
document 
</p>
<a name="wp88680"> </a><p class="pDefinition">
In general, an XML structure in which one or more elements contains text intermixed with subelements. See also <span style="font-style: italic"><a  href="Glossary.html#wp88647" target="_blank">data</a></span>. 
</p>
<a name="wp88683"> </a><p class="pDefinitionTerm">
document root
</p>
<a name="wp88685"> </a><p class="pDefinition">
The top-level directory of a <span style="font-style: italic"><a  href="Glossary.html#wp89322" target="_blank">WAR</a></span>. The document root is where JSP pages, client-side classes and archives, and static Web resources are stored. 
</p>
<a name="wp88687"> </a><p class="pDefinitionTerm">
DOM
</p>
<a name="wp90424"> </a><p class="pDefinition">
The Document Object Model. An API for accessing and manipulating XML documents as tree structures. DOM provides platform-neutral, language-neutral interfaces that enables programs and scripts to dynamically access and modify content and structure in XML documents.
</p>
<a name="wp88691"> </a><p class="pDefinitionTerm">
DTD 
</p>
<a name="wp88692"> </a><p class="pDefinition">
Document Type Definition. An optional part of the document prolog, as specified by the <span style="font-style: italic"><a  href="Glossary.html#wp89386" target="_blank">XML</a></span> standard. The DTD specifies constraints on the valid tags and tag sequences that can be in the document. The DTD has a number of shortcomings however, which has led to various schema proposals. For example, the DTD entry &lt;!ELEMENT username (#PCDATA)&gt; says that the XML element called username contains Parsed Character DATA-- that is, text alone, with no other structural elements under it. The DTD includes both the local subset, defined in the current file, and the external subset, which consists of the definitions contained in external .dtd files that are referenced in the local subset using a parameter entity. 
</p>
<a name="wp105072"> </a><p class="pDefinitionTerm">
durable subscription
</p>
<a name="wp105074"> </a><p class="pDefinition">
In a JMS <span style="font-style: italic"><a  href="Glossary.html#wp105918" target="_blank">publish/subscribe messaging system</a></span>, a subscription that continues to exist whether or not there is a current active subscriber object. If there is no active subscriber, JMS retains the subscription's <span style="font-style: italic"><a  href="Glossary.html#wp105664" target="_blank">messages</a></span> until they are received by the subscription or until they expire. 
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<a name="wp106820"> </a><div style="color: #000000; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: bold; margin-bottom: 13pt; margin-left: 24pt; margin-right: 0pt; margin-top: 13pt; text-align: justify; text-decoration: none; text-indent: 0pt; text-transform: none">
<span style="font-style: italic"><a  href="Glossary.html#wp106696" target="_blank">A</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp106727" target="_blank">B</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp106758" target="_blank">C</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp106789" target="_blank">D</a></span> E <span style="font-style: italic"><a  href="Glossary.html#wp106851" target="_blank">F</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp106882" target="_blank">G</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp106913" target="_blank">H</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp106960" target="_blank">I</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp106991" target="_blank">J</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107022" target="_blank">K</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107053" target="_blank">L</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107086" target="_blank">M</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107153" target="_blank">N</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107184" target="_blank">O</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107215" target="_blank">P</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107246" target="_blank">Q</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107277" target="_blank">R</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107308" target="_blank">S</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107339" target="_blank">T</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107372" target="_blank">U</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107417" target="_blank">V</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107447" target="_blank">W</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107478" target="_blank">X</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp102489" target="_blank">Y</a></span> <span style="font-style: italic"><a  href="Glossary.html#wp107540" target="_blank">Z</a></span>
</div>
<a name="wp105080"> </a><p class="pDefinitionTerm">
EAR file 
</p>
<a name="wp105081"> </a><p class="pDefinition">
Enterprise Archive file. A JAR archive that contains a J2EE application.
</p>
<a name="wp88701"> </a><p class="pDefinitionTerm">
ebXML
</p>
<a name="wp88702"> </a><p class="pDefinition">
Electronic Business XML. A group of specifications designed to enable enterprises to conduct business through the exchange of XML-based messages. It is sponsored by OASIS and the United Nations Centre for the Facilitation of Procedures and Practices in Administration, Commerce and Transport (U.N./CEFACT).
</p>
<a name="wp105125"> </a><p class="pDefinitionTerm">
EJB
</p>
<a name="wp105127"> </a><p class="pDefinition">
See <span style="font-style: italic"><a  href="Glossary.html#wp105172" target="_blank">Enterprise JavaBeans</a></span>.
</p>
<a name="wp105129"> </a><p class="pDefinitionTerm">
EJB container 
</p>
<a name="wp105130"> </a><p class="pDefinition">
A container that implements the EJB component contract of the J2EE architecture. This contract specifies a runtime environment for enterprise beans that includes security, concurrency, life cycle management, transactions, deployment, naming, and other services. An EJB container is provided by an <span style="font-style: italic"><a  href="Glossary.html#wp105149" target="_blank">EJB</a></span> or <span style="font-style: italic"><a  href="Glossary.html#wp105437" target="_blank">J2EE</a></span> server. 
</p>
<a name="wp105134"> </a><p class="pDefinitionTerm">
EJB container provider 
</p>
<a name="wp105135"> </a><p class="pDefinition">
A vendor that supplies an EJB container. 
</p>
<a name="wp105136"> </a><p class="pDefinitionTerm">
EJB context 
</p>
<a name="wp105137"> </a><p class="pDefinition">
An object that allows an enterprise bean to invoke services provided by the container and to obtain the information about the caller of a client-invoked method. 
</p>
<a name="wp105138"> </a><p class="pDefinitionTerm">
EJB home object 
</p>
<a name="wp105139"> </a><p class="pDefinition">
An object that provides the life cycle operations (create, remove, find) for an enterprise bean. The class for the EJB home object is generated by the container's deployment tools. The EJB home object implements the enterprise bean's home interface. The client references an EJB home object to perform life-cycle operations on an EJB object. The client uses JNDI to locate an EJB home object. 
</p>
<a name="wp105140"> </a><p class="pDefinitionTerm">
EJB JAR file 
</p>
<a name="wp105141"> </a><p class="pDefinition">
A JAR archive that contains an EJB module. 
</p>
<a name="wp105143"> </a><p class="pDefinitionTerm">
EJB module 
</p>
<a name="wp105144"> </a><p class="pDefinition">
A software unit that consists of one or more enterprise beans and an EJB deployment descriptor. 
</p>
<a name="wp105146"> </a><p class="pDefinitionTerm">
EJB object 
</p>
<a name="wp105147"> </a><p class="pDefinition">
An object whose class implements the enterprise bean's remote interface. A client never references an enterprise bean instance directly; a client always references an EJB object. The class of an EJB object is generated by a container's deployment tools. 
</p>
<a name="wp105149"> </a><p class="pDefinitionTerm">
EJB server 
</p>
<a name="wp105151"> </a><p class="pDefinition">
Software that provides services to an <span style="font-style: italic"><a  href="Glossary.html#wp105129" target="_blank">EJB container</a></span>. For example, an EJB container typically relies on a transaction manager that is part of the EJB server to perform the two-phase commit across all the participating resource managers. The J2EE architecture assumes that an EJB container is hosted by an EJB server from the same vendor, so it does not specify the contract between these two entities. An EJB server may host one or more EJB containers.
</p>
<a name="wp105153"> </a><p class="pDefinitionTerm">
EJB server provider 
</p>
<a name="wp105154"> </a><p class="pDefinition">
A vendor that supplies an EJB server.
</p>
<a name="wp88733"> </a><p class="pDefinitionTerm">
element 
</p>
<a name="wp88734"> </a><p class="pDefinition">
A unit of XML data, delimited by tags. An XML element can enclose other elements. 
</p>
<a name="wp88735"> </a><p class="pDefinitionTerm">
empty tag
</p>
<a name="wp88736"> </a><p class="pDefinition">
A tag that does not enclose any content.
</p>
<a name="wp105160"> </a><p class="pDefinitionTerm">
enterprise bean 
</p>
<a name="wp105161"> </a><p class="pDefinition">
A component that implements a business task or business entity and resides in an EJB container; either an <span style="font-style: italic"><a  href="Glossary.html#wp88756" target="_blank">entity bean</a></span>, <span style="font-style: italic"><a  href="Glossary.html#wp89229" target="_blank">session bean</a></span>, or <span style="font-style: italic"><a  href="Glossary.html#wp105668" target="_blank">message-driven bean</a></span>. 
</p>
<a name="wp105165"> </a><p class="pDefinitionTerm">
enterprise bean provider 
</p>
<a name="wp105166"> </a><p class="pDefinition">
An application programmer who produces enterprise bean classes, remote and home interfaces, and deployment descriptor files, and packages them in an EJB JAR file. 
</p>
<a name="wp88746"> </a><p class="pDefinitionTerm">
enterprise information system 
</p>
<a name="wp88747"> </a><p class="pDefinition">
The applications that comprise an enterprise's existing system for handling company-wide information. These applications provide an information infrastructure for an enterprise. An enterprise information system offers a well-defined set of services to its clients. These services are exposed to clients as local or remote interfaces or both. Examples of enterprise information systems include: enterprise resource planning systems, mainframe transaction processing systems, and legacy database systems.
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<a name="wp88748"> </a><p class="pDefinitionTerm">