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JSP: The Complete Reference
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You can get around this in several ways The JSP page can write every URL as a JSP expression concatenating requestgetContextPath() with the rest of the URL, but this gets to be tedious and clutters up the code unnecessarily A more elegant approach is to use the HTML <BASE> element to assign a context to the page:
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<HTML> <HEAD> <BASE HREF= http://wwwlyricnotecom/products/ > </HEAD> <BODY> <A HREF= contest/rulesjsp >View the contest rules</A> </BODY> </HTML>
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With the <BASE> statement, the Web browser can interpret any nonabsolute URLs relative to the HREF attribute Thus, contest/rulesjsp becomes http://wwwlyricnotecom/products/contest/rulesjsp Of course, you aren t done yet You still need to figure out the BASE HREF at run time The HREF attribute needs to be a complete URL, not just an absolute path from the server, so you need a number of details The URL may start with https, if the connection uses SSL A port number may exist, not just the default port 80 Fortunately, the request object can provide all this information The following scriptlet solves the problem in a general way
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<% String String int String scheme server port path = = = = requestgetScheme(); requestgetServerName(); requestgetServerPort(); requestgetContextPath();
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StringBuffer sb = new StringBuffer(); sbappend(scheme); sbappend("://"); sbappend(server); if ((port != -1) && (port != 80)) { sbappend(":"); sbappend(port); } sbappend(path); sbappend("/");
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String baseURL = sbtoString(); %> <BASE HREF="<%= baseURL %>">
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Within a Web application, servlets and JSP pages can share data and functionality through a common object known as the servlet context This is an object that implements the javaxservletServletContext interface The servlet context serves a number of useful purposes: I Object sharing Both servlets and JSP pages can store objects by name in the servlet context, so they can be retrieved by other servlets and JSP pages These bindings persist as long as the application is active I Initialization parameters Constants used throughout the application can be specified in the deployment descriptor and accessed through methods in the servlet context This permits configuration details such as database URLs and driver class names to be specified outside any compiled Java code I Request dispatching Servlets can forward requests to other servlets and JSP pages or include their output in the current output stream The servlet context provides methods for creating request dispatchers using either a path or a servlet name I Message logging The servlet context has access to the servlet log and can be used to write messages in a vendor-independent way See Table 4-8 for a complete description of the methods provided by the servlet context In a JSP page, the servlet context object is automatically available in the application implicit variable In a servlet, it can be obtained with the getServletContext() method
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The Web Archive (war) File
Described so far is the run-time structure of a Web application For deployment, this structure must be collapsed into a single file called a Web archive (war) file This is nothing more than a jar file with a different extension (war), whose top level corresponds to the root of the Web application To use a concrete example, consider the products Web application, shown in Figure 18-2 Its root directory contains an indexjsp file and four content
JSP: The Complete Reference
Figure 18-2
Run-time structure of the products Web application
subdirectories: contest, debug, images, and sounds In addition, it contains a WEB-INF directory with the required classes and lib subdirectories, as well as the webxml deployment descriptor To create the war file, go to the products directory and use the JDK jar command line tool:
D:\lyricnote\products>jar -cvf productswar * added manifest adding: contest/(in = 0) (out= 0)(stored 0%) adding: contest/contesturl(in = 184) (out= 125)(deflated 32%) adding: contest/indexjsp(in = 1890) (out= 739)(deflated 60%) adding: debug/(in = 0) (out= 0)(stored 0%) adding: debug/AddProductjsp(in = 400) (out= 240)(deflated 40%) adding: debug/AddProduct2jsp(in = 543) (out= 292)(deflated 46%) adding: debug/Example1jsp(in = 153) (out= 119)(deflated 22%) adding: debug/Example1url(in = 76) (out= 78)(deflated -2%) adding: images/(in = 0) (out= 0)(stored 0%)
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