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Lecture 9: Network programming

Manipulating URLs URL is an acronym for Uniform Resource Locator and is a reference (an address) to a resource on the Internet. Sample structure of a URL. The resource name part may contain: host name, file | Lecture 9: Network programming Manipulating URLs URL is an acronym for Uniform Resource Locator and is a reference (an address) to a resource on the Internet. Sample structure of a URL. The resource name part may contain: host name, file name, port number(optional) and reference (optional) http://java.sun.com you can create a URL object in Java from an absolute URL or a relative URL. The URL class provides several methods implemented on URL objects. You can get the protocol, host name, port number, and filename from a URL. Protocol Identifier Resource Name Example code import java.net.*; import java.io.*; public class ParseURL { public static void main(String[] args) throws Exception { URL aURL = new URL("http://java.sun.com:80/docs/books/" + "tutorial/index.html#DOWNLOADING"); System.out.println("protocol = " + aURL.getProtocol()); System.out.println("host = " + aURL.getHost()); System.out.println("filename = " + aURL.getFile()); System.out.println("port = " + aURL.getPort()); System.out.println("ref = " + aURL.getRef()); } } Output of the above code: protocol = http host = java.sun.com filename = /docs/books/tutorial/index.html port = 80 ref = DOWNLOADING Connecting with a URL (1) openStream(): returns a java.io.InputStream object, from which you can read easily as reading from an input stream. It may throw an IOException Example code import java.net.*; import java.io.*; public class ReadURL { public static void main(String[] args) throws Exception { URL osu = new URL("http://www.itu.edu/"); BufferedReader in = new BufferedReader( new InputStreamReader(osu.openStream())); String inputLine; while ((inputLine = in.readLine()) != null) System.out.println(inputLine); in.close(); } } This prints out the source code for the webpage www.itu.edu Connecting with a URL (2) openConnection(): Returns a URLConnection object that represents a connection to the remote object referred to by the URL. It may throws an IOException try { URL osu = new . | Lecture 9: Network programming Manipulating URLs URL is an acronym for Uniform Resource Locator and is a reference (an address) to a resource on the Internet. Sample structure of a URL. The resource name part may contain: host name, file name, port number(optional) and reference (optional) http://java.sun.com you can create a URL object in Java from an absolute URL or a relative URL. The URL class provides several methods implemented on URL objects. You can get the protocol, host name, port number, and filename from a URL. Protocol Identifier Resource Name Example code import java.net.*; import java.io.*; public class ParseURL { public static void main(String[] args) throws Exception { URL aURL = new URL("http://java.sun.com:80/docs/books/" + "tutorial/index.html#DOWNLOADING"); System.out.println("protocol = " + aURL.getProtocol()); System.out.println("host = " + aURL.getHost()); System.out.println("filename = " + aURL.getFile()); System.out.println("port = " + aURL.getPort()); .