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model view controller architecture
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上传时间: 2009-07-23
详细说明： Servlets are great when your application requires a lot of real programming to accomplish its task. As illustrated earlier in this book, servlets can manipulate HTTP status codes and headers, use cookies, track sessions, save information between requests, compre ss pages, access databases, generate JPEG images on-the-fly, and perform many other tasks flexibly and efficiently. But, generating HTML with servlets can be tedious and can yield a result that is hard to modify. That’s where JSP comes in: as illustrated in Figure 15–1, JSP lets you separate much of the presentation from the dynamic content. That way, you can write the HTML in the normal manner, even using HTML-specific tools and putting your Web content developers to work on your JSP documents. JSP expressions, scriptlets, and declarations let you insert simple Java code into the servlet that results from the JSP page, and directives let you control the overall layout of the page. For more complex requirements, you can wrap Java code inside beans or even define your own JSP tags ...展开收缩
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