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Print QR-Code in Java Part IV

Part IV
Making Denso QR Bar Code In Java
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Read QR Code JIS X 0510 In Java
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JSP and Other Web Components
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Barcode Reader In Java
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JavaServer pages aren t only a presentation layer for Web applications; they can act as the client or server for other applications The next two chapters deal with the larger context in which JavaServer pages are used how they can communicate with Java applications, applets, Perl scripts, mail servers, and other server-side agents
Create QR In Visual C#
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Quick Response Code Generation In Visual Studio .NET
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QR Printer In VS .NET
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Draw QR Code In Visual Basic .NET
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USS Code 39 Encoder In Java
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20
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Communicating with Other Clients
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Generating EAN / UCC - 13 In VS .NET
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JSP: The Complete Reference
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eb browsers are the most common JSP clients, but they aren t the only ones As more applications become Web-enabled, network resources become important components in all types of systems The Internet can serve as the communications link over which raw data can be delivered, without dictating how it s presented For example, up-to-the-minute currency exchange rates can be made available for use in batch computations Interactive travel booking can be part of an executive information system Current weather conditions, news headlines, and stock prices can be embedded in small information windows in other applications maybe even in consumer electronic products This is possible because any program that can use the HTTP protocol can act as a JSP client Using basic classes in the javanet package, applications can make HTTP requests and read the results as if they were simply the contents of a file What s more, the file content is dynamic and can be controlled by the parameters of the request In this chapter, you walk through the development of three types of nonbrowser JSP clients:
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I A Java application I A Java applet I A Perl script Each example consists of a JSP server and a client that can take advantage of it But first, let s examine the basic technique
URL Connections
The key to being the server is appearing to be an input stream The Java class libraries provide three classes that make this possible: I javanetURL I javanetURLConnection I javanetHttpURLConnection
The URL Class
A Uniform Resource Locator (URL) is a unique address of an object available on a network, as well as an indication of the protocol that must be used to operate on that object1 These protocols include ftp, http, gopher, mailto, news, and others used in specialized applications The URLs we consider in this chapter use the Hypertext Transfer Protocol (HTTP)
The complete URL specification is in RFC 1738, which can be found at http://wwwfreesoftorg/CIE/RFC/1738/indexhtm
20:
Communicating with Other Clients
An HTTP URL consists of five parts: <scheme>://<host>[:<port>]/<path>[ <query string>] The scheme is either http, for unencrypted transmissions, or https, for transmissions that use an encryption technique such as Secure Sockets Layer (SSL) The host part is the fully qualified domain name of a network host, possibly represented as a dotted decimal IP address The port number is optional and defaults to 80 if not specified The path is an address within the host HTTP server s document space, which is usually structured as a directory tree A URL can also contain request parameters encoded in the query string The javanetURL class is an object-oriented wrapper for URLs It provides methods to build URLs from strings and to access the previously described individual parts In addition, the javanetURL class has two important methods that allow the contents of the resource pointed to by the URL to be accessed and, in some cases, modified These methods are listed in Table 20-1 In many cases, reading from a remote network resource is as simple as this:
URL url = new URL( http://servername/path/filename ); InputStream in = urlopenStream(); int c; while ((c = inread()) != -1) { // do something with this byte }
JSP AND OTHER WEB COMPONENTS
Method
public URLConnection openConnection() public final InputStream openStream()
Description
Makes a connection to the remote object represented by the URL Opens a URLConnection and creates an InputStream for reading its contents This is a convenience method that calls openConnection()getInputStream()
Table 20-1
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