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Some Useful Methods in javanetURL
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The URLConnection Class
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The underlying class that makes this possible is javanetURLConnection This is an abstract class whose subclasses represent connections between a program and a remote network resource Using a URLConnection involves four steps: 1 A URLConnection object is created by calling the openConnection() method of a URL 2 The connection is configured for the specific task at hand This may include indicating whether the connection should be used for input, output, or both, as well as setting request properties to indicate the content type, length, and other headers 3 The connection is made, usually implicitly (although the connect() method can be used for this purpose) 4 The remote resource becomes accessible The connection can supply the resource contents and any response headers sent with it A few of the methods you use most often are listed in Table 20-2
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public void setRequestProperty (String key, String value)
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Sets a general request property, such as an HTTP header, for the connection An example might be a key of Content-Length, with an integer value representing the number of bytes in the data portion of the request Returns an output stream for writing data to the connection, such as form parameters in an HTTP POST request Returns an input stream for reading data from the connection Programs that call this method typically wrap the result in a buffered stream of some kind for performance reasons
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public OutputStream getOutputStream() public InputStream getInputStream()
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Table 20-2
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Some Useful Methods in javanetURLConnection
20:
Communicating with Other Clients
The HttpURLConnection Class
URLConnection is an abstract, protocol-neutral class For this reason, it doesn t have a public constructor It can only be created by calling the openConnection() method of a URL The actual object returned by this call is a protocol-specific subclass that handles the URL s protocol For the examples in this chapter, this subclass is javanetHttpURLConnection Well, almost HttpURLConnection itself is abstract The vendor of the Java virtual machine supplies an actual implementation class You can see what that class is by calling the getClass() method of the object returned by openConnection():
import javaio*; import javanet*; public class ShowConnectionClass { public static void main(String[] args) throws IOException { URL url = new URL("http://wwwibmcom"); URLConnection con = urlopenConnection(); Class conClass = congetClass(); Systemoutprintln ("Connection class is " + conClassgetName()); } } JSP AND OTHER WEB COMPONENTS
With the Sun JVM, the output of this program is
Connection class is sunnetwwwprotocolhttpHttpURLConnection
An HttpURLConnection provides three additional capabilities beyond what is supplied by URLConnection: I A means of specifying the request method I Direct access to the HTTP response code I A set of constants that give mnemonic names to HTTP response codes Table 20-3 describes several methods of interest In the following sections, you see how a URL connection makes it possible to view a JSP page as if it were a programmable file
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Method
public int getResponseCode()
Description
Extracts the HTTP response code from the first line of the response For example, if the response line is HTTP/10 404 Not found, this method returns 404 Returns the rest of the response line after the response code For example, if the response line is HTTP/10 404 Not found, this method returns Not found If set to true, causes a response code of 301 (Moved Permanently) or 302 (Moved Temporarily) to result in another request to the forwarding address to be generated automatically Specifies the HTTP request method to be used: GET, POST, HEAD, OPTIONS, PUT, DELETE, or TRACE
public String getResponseMessage()
public static void setFollowRedirects (boolean set)
public void setRequestMethod (String method) Table 20-3
Useful Methods in javanetHttpURLConnection
Java Applications as Clients
Our hypothetical Internet music company, LyricNotecom, participates with other online retailers in a price quotation system managed by a discount product buying service Customers can ask the buying service for a quote on a particular musical instrument, and the buying service then searches the Web sites of its participating suppliers for the best price Each supplier returns a price quotation as an XML document in a standard format prescribed by the buying service
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