• Our clients use older browsers that do not understand JSP. What should we do?
• When our clients use "View Source" in a browser, how can I prevent them from seeing the JSP tags?
All of these questions are based upon the assumption that browsers know something about the server-side process. But they do not. Thus:
• For putting applets with Swing components into Web pages, what matters is the browser's Java version—the server's version is irrelevant. If the browser supports the Java 2 platform, you use the normal APPLET (or Java plug-in) tag and would do so even if you were using non-Java technology on the server.
• You do not need Java I/O to read image files; you just put the image in the directory for Web resources (i.e., two levels up from WEB-INF/classes) and output a normal IMG tag.
• You create images that change under the mouse by using client-side JavaScript, referenced with the SCRIPT tag; this does not change just because the server is using JSP.
• Browsers do not "support" JSP at all—they merely see the output of the JSP page. So, make sure your JSP outputs HTML compatible with the browser, just as you would do with static HTML pages.
• And, of course you need not do anything to prevent clients from seeing JSP tags; those tags are processed on the server and are not part of the output that is sent to the client.
水电站电气一次设计+电气主接线图CAD图纸 Confusing Translation Time with Request Time
A JSP page is converted into a servlet. The servlet is compiled, loaded into the server's memory, initialized, and executed. But which step happens when? To answer that question, remember two points:
• The JSP page is translated into a servlet and compiled only the first time it is accessed after having been modified.
• Loading into memory, initialization, and execution follow the normal rules for servlets.
Table 1 gives some common scenarios and tells whether or not each step occurs in that scenario. The most frequently misunderstood entries are highlighted. When referring to the table, note that servlets resulting from JSP pages use the _jspService method (called for both GET and POST requests), not doGet or doPost. Also, for initialization, they use the jspInit method, not the init method.本文来自辣.文,论-文·网原文请找腾讯32.49114
Table 1. JSP Operations in Various Scenarios
JSP page translated into servlet Servlet compiled Servlet loaded into server's memory jspInit called _jspService called
Page first written
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