how to generate barcode in asp net core

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A tag s action is implemented in a Java class known as a tag handler Instances of tag handlers are created and maintained by the JSP container, and predefined methods in these classes are called directly from a JSP page s generated servlet In the sample tag, we need to get the name of the Web server (for example, Apache, Microsoft IIS, Netscape Enterprise, and so forth) The servlet API doesn t provide an obvious way to get this information The request object tells a lot about the Web client and the servlet context knows about the servlet engine, but neither of these objects appears to know what software product happens to be listening on port 80 However, this information is provided by the Web server itself when it sends the HTTP response back to the Web client The approach we ll take is to make a dummy HTTP request ourselves within the tag handler, and then extract the server information from the HTTP headers that are returned Here is the complete source code for the tag handler:

package jspcrtaglibdiag; import import import import import javaxservlethttp*; javaxservletjsp*; javaxservletjsptagext*; javaio*; javanet*;

/** * Handler for the "getWebServer" tag */ public class GetWebServerTag extends TagSupport { public int doStartTag() throws JspException { try { // Get the request object from the page context HttpServletRequest request = (HttpServletRequest) pageContextgetRequest(); // Request information from web server URL url = new URL("http",

11:

requestgetServerName(), requestgetServerPort(), "/"); URLConnection con = urlopenConnection(); ((HttpURLConnection) con)setRequestMethod("OPTIONS"); String webserver = congetHeaderField("server"); // Write it to the output stream ELEMENTS OF JSP JspWriter out = pageContextgetOut(); outprint(webserver); } catch (IOException e) { throw new JspException(egetMessage()); } return SKIP_BODY; } }

package jspcrtaglibdiag;

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The first line identifies the package name It isn t strictly necessary to place the code in a package, but it helps to organized related classes and makes for more meaningful Javadoc documentation Besides, some JSP engines don t correctly generate import statements for custom tags, so classes without a package name can cause compilation errors in the generated servlet

import import import import import javaxservlethttp*; javaxservletjsp*; javaxservletjsptagext*; javaio*; javanet*;

Simple tag handlers usually need to import only the javaxservletjsp and javaxservletjsptagext packages, as well as the javaioIOException class In this case, we need the HttpServletRequest class from javaxservlethttp, as well as several classes from javanet

A tag handler needs to implement either the Tag interface or the BodyTag interface, both of which are in the javaxservletjsptagext package BodyTag is a subinterface of Tag While the tag author is free to implement these interfaces directly, it usually is more convenient to extend one of the default implementation classes TagSupport or BodyTagSupport, overriding only those methods we need for the task at hand The example tag doesn t support a tag body, so we simply extend the TagSupport class

This method is called when the start tag is encountered, after any attributes it specifies have been set in the tag handler, but before the body of the tag is processed In this case, no body and no attributes exist, so all the code will be contained in the doStartTag() method Note, the method lets you throw a JspException if the code runs into trouble Because we will be accessing network classes that can throw javaioIOException, we enclose the entire method in a try catch block that converts this to a JspException for handling by the JSP container Note, likewise, the method returns an integer return code (more about this shortly)

HttpServletRequest request = (HttpServletRequest) pageContextgetRequest();

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