<html> <h1>Hello <%=request.getParameter(uName)%> </h1> </html> in Java

Encoder QR Code ISO/IEC18004 in Java <html> <h1>Hello <%=request.getParameter(uName)%> </h1> </html>

<html> <h1>Hello <%=request.getParameter(uName)%> </h1> </html>
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When JSP was originally developed, it was heavily criticized for embedding Java code directly into HTML pages (as done above). When data and code are collocated, there is inevitably contention between the HTML author and the JSP developer trying to work on the same source file. For enterprise applications,
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User interface development
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there is usually an obvious need to separate the roles of UI designer and code hound. To solve this problem, the JSP specification evolved to include the use of custom tag libraries and JavaBeans. These additions freed JSPs of much Java code by encapsulating complex presentation logic within tags and data structures within JavaBeans. XML tags referring to these other components now replace much of the old JSP code. While the amount of code present in JSPs decreased, the complexity of the overall architecture increased. In particular, tags often contain a combination of presentation markup tags and Java code, making some pages more difficult to maintain. The page designer cannot be expected to modify and recompile tags to accomplish a simple HTML change; and finding the code that needs to change can be tedious. A secondary issue with tags and JavaBeans in JSP is one of enforcement. Developers often opt for the path of least resistance, continuing to embed Java code directly in JSPs.
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Code redundancy As we discussed in section 5.1, the advent of multidevice and internationalization requirements for J2EE applications puts much more strain on the pure J2EE architecture. As we demonstrate in the next section, building our stock quote example pages requires between two and four individual JSP pages. As we increase either the number of locales or the number of client device types being serviced, the number of JSP pages proliferates. Consider the burden of developing and maintaining a set of 100 JSP pages to satisfy five functional requirements. Think about making the same change in 20 different JSP pages, testing them individually, and then regression testing the entire application. If the change is to logic, you hopefully have encapsulated it in a tag or a JavaBean. If the change is to the presentation layout or flow, you are in a world of hurt. 5.2.3 Building our example in J2EE
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Enough discussion. It is time to see the issues in action. To service requests for our example watch list page using only J2EE, we require the following components:
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A servlet to accept the client request and interact with our application logic layer to obtain a list of stock quotes. A JSP for each device type for which we need to render the list.
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The pure J2EE approach
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Handling the request We require a servlet to accept watch list user requests, obtain the watch list, and select a view with which to render the list. In this J2EE-only scenario, our servlet will forward the watch list to one of four JSPs, depending on the client device type the user is connecting from and the user s locale. The first step our servlet will take is to obtain the user s stock quote list. We assume that our application has stored the user s unique identifier as a String in the HttpSession object. After retrieving that identifier, we make a call to the application logic layer to obtain the stock quote list as a JDOM value object.
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HttpSession session = request.getSession(false); ListBuilder builderInterface = ... // ... validate session object exists String userId = (String) session.getAttribute("userId"); org.jdom.Document quoteList = builderInterface.getWatchList(userId);
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We then wrap the quoteList in a JavaBean object and store it in the request, for later retrieval by the JSP component. We go over the bean code later in this section.
XMLHelperBean helper = new XMLHelperBean(quoteList); session.setAttribute(helper, helper);
The final step is the most involved. We must determine which of our four JSPs will render the response for the user. To do this, we must determine the user s device type and locale preference. First we develop a method to determine the device type, using the User-Agent HTTP header.
private String getOutputType(HttpServletRequest request) { String userAgent = request.getHeader("User-Agent"); // compare to list of WAP User-Agents // for simplicity, we'll only try one here if (userAgent.indexOf("UP.Browser") >= 0) return "wml"; return "html"; }
In a real-world scenario, this servlet would maintain a dictionary of known user-agents and their associated MIME content types. For the example, we only output WML if someone is using the UP.Browser phone browser. Calling the above method will set the output format. Now we require a method to choose a JSP based on the output format and the user s locale. For that, we use the Accept-Language HTTP header(s), which contains an ordered list of preferred locales from the user s browser settings.
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