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typically requires a great deal of back-and-forth conversation, as well as complex objects that must be initialized and have their state maintained The way around this is to have the server assign an identifier to the session represented by a set of client requests, and to have the client remember the identifier and supply it to the server with each request This technique is explored in depth in 14 Let s examine each of these steps in greater detail

A Web server operates by listening for requests on a particular well-known port number, usually port 80, although any available port can be used If a Web server listens on a different port, URLs that refer to this server must include a colon and the port number immediately after the server name For example,

refers to an HTML document known to a Web server running on the wwwmycompanycom host on the default port 80 If the server is running on port 4311 instead, the URL looks like this:

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Why bother with alternate port numbers, especially because they introduce that ugly URL syntax Because this allows more than one server to be running on a single host An experimental Web server with different capabilities may need to coexist with the main server The Tomcat and JRun servlet engines, for example, can run a mini HTTP server for testing servlets and JSP pages Most Web servers provide some means of hiding this alternate syntax by mapping the URLs to a different namespace A client, such as a Web browser, initiates an HTTP request by opening a TCP/IP socket to the Web server port, and then opening input and output stream over the socket In Java terms, this would amount to a few lines of code:

Socket socket = new Socket( wwwmycompanycom , 80); InputStream istream = socketgetInputStream(); OutputStream ostream = socketgetOutputStream();

The parameters required to open the socket are the Web server host name and the port number The server host name is extracted from the URL, while the port number is either implied or also extracted from the URL The output stream is used to send HTTP commands to the Web server; the input stream is used to read the response

3:

Dim xml As XElement = XElement.Load("..\..\People.xml") xml.Element("person").ReplaceContent(New XElement("id", 5), _ New XElement("firstname", "Tom"), _ New XElement("lastname", "Cruise"), _ New XElement("idrole", 1)) Console.WriteLine(xml)

Overview of the Hypertext Transfer Protocol (HTTP)

8

he previous chapter covered JSP expressions and scriptlets Along with fixed HTML template data, these two element types share a common environment they exist within the _jspService() method of a generated Java servlet While this is adequate for most request processing, it imposes some restrictions on the servlet s capability This chapter introduces JSP declarations, which allow the JSP author to write Java code that operates outside the _jspService() method

Similar to a scriptlet, a JSP declaration consists of Java source code embedded within an HTML page Declarations are set off from the rest of the page by special opening and closing tags, as the following shows: <%! java statements %> The syntax of a declaration is identical to that of a scriptlet, with one exception: the opening delimiter is <%!, rather than <% Like a scriptlet, the code inside the declaration delimiters is copied verbatim to the generated Java servlet The essential difference is where the code is placed: scriptlets are copied to the inside of the _jspService() method, whereas declarations are written outside the method as top-level members of the enclosing class Understanding this distinction can help develop your mental model of how JSP works and can help explain unexpected behavior

An example of how code for a declaration is generated would make this clearer Consider the following JSP page that uses a scriptlet to display the current time:

<%@ page import="javatext*,javautil*" %> <% DateFormat fmt = new SimpleDateFormat("hh:mm:ss aa"); String now = fmtformat(new Date()); %> The time is <%= now %>

The page is stored in a file named ShowTimeSjsp (S for scriptlet) When this file is invoked, it displays the current time:

8:

If the user refreshes the page, the time is incremented, as expected:

Now consider the same JSP written with a declaration rather than a scriptlet This page is named ShowTimeDjsp (D for declaration):

Figure 7-17

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