how to generate qr code in asp net core

how to generate qr code in asp net core

how to generate qr code in asp net core

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<%@ page import="javaio*,javautil*" %> <%! /** * Inner class for passing parameters between methods */ class Parameters { JspWriter out; HttpSession session; String url; } public void showSessionID(Parameters parms) throws IOException { JspWriter out = parmsout; HttpSession session = parmssession; String url = parmsurl; Date created = new Date(sessiongetCreationTime()); outprintln("The session was created at " + created + "<P>"); outprintln("The url parameter was " + url); } %> <% Parameters parms = new Parameters(); parmsout = out; parmssession = session; parmsurl = requestgetParameter("url"); showSessionID(parms); %>

The generated servlet includes both the inner class and the method definition inside the top level of the class, and the scriptlet inside _jspService():

import import import import import import import import import import import import import import javaxservlet*; javaxservlethttp*; javaxservletjsp*; javaxservletjsptagext*; javaioPrintWriter; javaioIOException; javaioFileInputStream; javaioObjectInputStream; javautilVector; orgapachejasperruntime*; javabeans*; orgapachejasperJasperException; javaio*; javautil*;

public class PassInnerClass extends HttpJspBase { // begin [file="PassInnerClassjsp";from=(1,3);to=(22,0)] /** * Inner class for passing parameters between methods */ class Parameters { JspWriter out; HttpSession session; String url; } public void showSessionID(Parameters parms) throws IOException { JspWriter out = parmsout; HttpSession session = parmssession; String url = parmsurl; Date created = new Date(sessiongetCreationTime()); outprintln("The session was created at " + created + "<P>");

The Remove method applied to the current node removes that element from the XML document. Using the Remove method with an IEnumerable(Of XElement) collection iterates through all the elements and removes them (see Listing 3-25).

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8:

outprintln("The url parameter was " + url); } // end // public void _jspService( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // // begin [file="PassInnerClassjsp";from=(23,2);to=(29,0)] Parameters parms = new Parameters(); parmsout = out; parmssession = session; parmsurl = requestgetParameter("url"); showSessionID(parms); // end } }

Summary

7 covered scriptlets and expressions This chapter introduced a third type of scripting element, a JSP declaration Like a scriptlet, a declaration is used to incorporate Java statements into a JSP page The key difference between the two is where the JSP container writes the code in the generated servlet With a scriptlet, the code becomes part of the _jspService() method, whereas code in a declaration becomes top-level code in the servlet class This distinction is important to understand because it affects the context in which the code operates Declarations have three primary uses: I Variable declarations Both class and instance variables can be defined, although care must be taken to ensure that write access to the variables is synchronized because servlets, by default, are multithreaded The most practical use of variable declarations is for static final constants

I Method definitions Additional methods can be added to the generated servlet by means of JSP declarations Because the generated code is not inside the _jspService() method, however, it does not have access to the implicit variables (request, response, out, and so forth) These variables must be explicitly passed to the method if they are to be used Declarations can be used to override the jspInit() and jspDestroy() methods I Inner classes Declarations provide a convenient means for writing inner classes This chapter describes using an inner class as a data structure for passing a set of variables between methods in the generated servlet

9

n large-scale Web development projects, having HTTP requests handled by more than one server-side component is often desirable Several reasons exist for this: I Elimination of redundancy Many features of a Web site are common to all pages, such as headers and footers, navigation bars, and other elements of the look and feel Rather than duplicate the HTML that generates these features, being able to write them once and use them in a number of places is useful I Separation of content and presentation Because Java can be used freely in any part of a JSP, you can easily end up with code that both generates information and presents it, perhaps reading from a database, performing calculations, and generating HTML tables Changing both the logic and the appearance of the page may be necessary later Such code can quickly become overly complex What makes more sense is to separate the pure Java code that accesses the database and applies business logic from the JSP code that creates an output Web page

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