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The Java API for XML-based Remote Procedure Call (JAX-RPC) is an API used to generate remote procedure calls in order to build web services and clients. The Java EE JAX-RPC API is available in the javax.xml.rpc package and subpackages. Figure 12-5 shows the various JAX-RPC packages. JAX-RPC uses various web services discussed in this chapter to support remote procedure calls that is, JAX-RPC uses the HTTP transport protocol and the SOAP standard to support building these remote calls for use over the Internet. The API also supports the importing and exporting of WSDL documents.
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You need to use a protocol that will support the delivery of your e-mail. Which protocol would you use that is supported by the JavaMail API You would make use of the Simple Mail Transfer Protocol (SMTP).
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You would make use of the Post Office Protocol You need to use a simple protocol to receive e-mail. Which protocol would you use that is supported by the (POP). JavaMail API You need to use an advanced protocol to receive email that has more options than POP. Which protocol would you use that is supported by the JavaMail API You need to make use of a standard that defines the structure of the mail content to be transferred. Which standard would you use that is supported by the JavaMail API You would make use of the Internet Message Access Protocol (IMAP). You would make use of the Multipurpose Internet Mail Extensions (MIME).
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FIgURE 12-5 javax.xml.rpc
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javax.xml.rpc.encoding javax.xml.rpc.holders javax.xml.rpc.server
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javax.xml.rpc.handler
javax.xml.rpc.handler.soap
JAX-RPC packages
The current version of the JAX-RPC specification has been renamed from JAXRPC to JAX-WS.This Java API for XML Web Services (JAX-WS) specification is being developed under JSR 224.
CERTIFICATION OBJECTIVE
Understanding Dynamic Web Content Solutions
Exam Objective 8.2 Describe at a high level the basic characteristics of servlet and JSP support for HTML thin-clients. Servlets and JavaServer Pages provide dynamic web content support. Servlets and JavaServer Pages (JSP) are specifications that are tied to Java EE releases. Various commercial and non-commercial vendors implement those specifications. The implementations are designed within either a web container, application server, or both. Noncommercial web containers include, but are not limited to, Apache Tomcat, Jetty, and Winstone. A current list of commercial web containers can be found on Wikipedia (the free online encyclopedia) at http://en.wikipedia.org/wiki/ List_of_Servlet_containers. Table 12-4 details commonly used web containers and their versions. This table is presented to help you conceptualize the implementations of web containers in the real world.
12:
Understanding Server-Side Technologies
TABlE 12-4
Various Servlet and JSP Web Containers and Their Versions
Servlet/JSP Specification
Servlet 3.0 JSP 2.1 Servlet 2.5 JSP 2.1 Servlet 2.4 JSP 2.0 Servlet 2.3 JSP 1.2
Java EE/SE Implementation
Java EE 6 w/ Java SE 6.0 Java EE 5 w/ J2SE 5.0 J2EE 1.4 w/ J2SE 1.3 J2EE 1.3 w/ J2SE 1.2
Apache Tomcat Version
Tomcat 7.0.x Tomcat 6.0.x Tomcat 5.5.x Tomcat 4.1.x
Jetty Version
Jetty-7.0 Jetty-6.1 Jetty-5.1 Jetty-4.2
Winstone Version
Pending Winstone 0.9 Winstone 0.6
Sun Java System Web Server
Pending JSWS 7.0 JSWS 7.0 JSWS 6.1
The following sections detail the purpose of servlets and JSPs and their capabilities, and cover the topics listed next.
n Java Servlet API n JavaServer Pages API
Java Servlet API
The Java Servlet API allows a pure-Java program to execute in response to a webbased HTTP request. This Servlet API is made available in the javax.servlet package and subpackages. Servlets allow for web interfacing functionality so Java developers can add dynamic web content to their software. This web content is normally generated HTML, but may be XML. Servlets play an important dynamic role since the developer can programmatically decide what HTML is rendered. This is an advantage over deploying web pages by themselves since (again) servlets let HTML content be rendered based on conditions. A big disadvantage of servlets is the lack of ease and cleanliness of writing HTML code, because creating syntactical errors is common and conceptualizing the presentation is hard. As you can see in the following servlet, writing HTML code can be tedious and error-prone. Fortunately, JavaServer Pages was designed to expedite and ease the creating of web content.
import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException;
Understanding Dynamic Web Content Solutions
import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class SampleServlet extends HttpServlet { // Called from web browser public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); out.println("<p>HTML page message from doGet method.</p>"); } // Called via standard input stream public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); out.println("<p>HTML page message from doPost method.</p>"); } }
Servlets work on the basic principle of overriding the doGet and doPost methods as they relate to web browsers requests and response interactions. In the previous example, the doGet and doPost methods are overridden. For the former method, the user would access this servlet (and the doGet method) by typing in the class name in the web browser s address bar (for example, www.scjaexam. com/SampleServlet). After pressing the enter key, the browser will send a request message to execute the doGet method. In response, the associated HTML content will be sent to, and rendered by, the web browser.
JavaServer Pages and servlets are used for dynamic web content solutions. Remember that servlets act as the controller and that JSPs are converted into servlets before the pages are rendered for deployment. Servlets are loaded into memory the first time they are called, causing a slight delay. However, subsequent calls are handled very quickly, allowing JSP/servlet pages to run faster than competing technologies like PHP and Perl.
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