Java And Url's

Java And Url's are easy to work with. and here are a few ways:

Getting text from a url:

Code:JAVA

try {
   // Create a URL for the desired page
   URL url = new URL("[url]http://hostname:80/index.html[/url]");
 
   // Read all the text returned by the server
   BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
   String str;
   while ((str = in.readLine()) != null) {
       // str is one line of text; readLine() strips the newline character(s)
   }
   in.close();
} catch (MalformedURLException e) {
} catch (IOException e) {
}

Access a password protected url:

Code:JAVA

// Install the custom authenticator
Authenticator.setDefault(new MyAuthenticator());
 
// Access the page
try {
   // Create a URL for the desired page
   URL url = new URL("[url]http://hostname:80/index.html[/url]");
 
   // Read all the text returned by the server
   BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
   String str;
   while ((str = in.readLine()) != null) {
       // str is one line of text; readLine() strips the newline character(s)
   }
   in.close();
} catch (MalformedURLException e) {
} catch (IOException e) {
}
 
public class MyAuthenticator extends Authenticator {
   // This method is called when a password-protected URL is accessed
   protected PasswordAuthentication getPasswordAuthentication() {
       // Get information about the request
       String promptString = getRequestingPrompt();
       String hostname = getRequestingHost();
       InetAddress ipaddr = getRequestingSite();
       int port = getRequestingPort();
 
       // Get the username from the user...
       String username = "myusername";
 
       // Get the password from the user...
       String password = "mypassword";
 
       // Return the information
       return new PasswordAuthentication(username, password.toCharArray());
   }
}

Converting between a URI and a URL:

Code:JAVA

URI uri = null;
URL url = null;
 
// Create a URI
try {
   uri = new URI("file://D:/almanac1.4/Ex1.java");
} catch (URISyntaxException e) {
}
 
// Convert an absolute URI to a URL
try {
   url = uri.toURL();
} catch (IllegalArgumentException e) {
   // URI was not absolute
} catch (MalformedURLException e) {
}
 
// Convert a URL to a URI
try {
   uri = new URI(url.toString());
} catch (URISyntaxException e) {
}

Creating a URL:

Code:JAVA

try {
   // With components.
   URL url = new URL("http", "hostname", 80, "index.html");
 
   // With a single string.
   url = new URL("[url]http://hostname:80/index.html[/url]");
} catch (MalformedURLException e) {
}

Sending a POST Request Using a URL:

Code:JAVA

try {
   // Construct data
   String data = URLEncoder.encode("key1", "UTF-8") + "=" + URLEncoder.encode("value1", "UTF-8");
   data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" + URLEncoder.encode("value2", "UTF-8");
 
   // Send data
   URL url = new URL("[url]http://hostname:80/cgi[/url]");
   URLConnection conn = url.openConnection();
   conn.setDoOutput(true);
   OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
   wr.write(data);
   wr.flush();
 
   // Get the response
   BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
   String line;
   while ((line = rd.readLine()) != null) {
       // Process line...
   }
   wr.close();
   rd.close();
} catch (Exception e) {
}

Parsing a URL:

Code:JAVA

try {
   URL url = new URL("[url]http://hostname:80/index.html#_top_[/url]");
 
   String protocol = url.getProtocol();    // http
   String host = url.getHost();            // hostname
   int port = url.getPort();               // 80
   String file = url.getFile();            // index.html
   String ref = url.getRef();              // _top_
} catch (MalformedURLException e) {
}

Please enjoy!!

Source: http://www.exampledepot.com/

 

nice!

 

Thanks =)

 

HTML scrapping (Aka reading text from a page) is a great way to check if a plugin is up to date, in case anyone needs an example on what to use this with!