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928 Accessing HTTP-Specific Functionality Using HttpURLConnection
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This next example shows how to read the status code and message of a response Most URLs will generate a "normal" response, with a 200 status code and a normal entity body However, in some situations (for example, if a resource has moved or if the request method is not supported) this will not be the case Code for UsingHttpURLConnection
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import javanet*; import javaio*; // 9, Listing 5 public class UsingHttpURLConnection { public static void main(String args[]) throws Exception { int argc = argslength;
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// Check for valid number of parameters if (argc != 1) { Systemoutprintln ("Syntax :"); Systemoutprintln ("java UsingHttpURLConnection url"); return; } // Catch any thrown exceptions try { // Create an instance of javanetURL javanetURL myURL = new URL ( args[0] ); // Create a URLConnection object, for this URL // NOTE : no connection has yet been established URLConnection connection = myURLopenConnection(); // Check to see if connection is a HttpURLConnection instance if (connection instanceof javanetHttpURLConnection) { // Yes cast to a HttpURLConnection instance HttpURLConnection hConnection = (HttpURLConnection) connection; // Disable automatic redirection, to see the status header hConnectionsetFollowRedirects(false); // Connect to server hConnectionconnect(); // Check to see if a proxy server is being used if (hConnectionusingProxy()) { Systemoutprintln ("Proxy server used to access resource"); } else { Systemoutprintln ("No proxy server used to access resource"); } // Get the status code int code = hConnectiongetResponseCode(); // Get the status message String msg = hConnectiongetResponseMessage(); // If a 'normal' response if ( code == HttpURLConnectionHTTP_OK ) { // Notify user Systemoutprintln ("Normal response returned : " + code + " " + msg ); } else
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{ // Output status code and message Systemoutprintln ("Abnormal response returned : " + code + " " + msg ); } // Pause for user Systemoutprintln ("Hit enter to continue"); Systeminread(); } else { Systemerrprintln ("Invalid transport protocol not http!"); return; } } // MalformedURLException indicates parsing error catch (MalformedURLException mue) { Systemerrprintln ("Unable to parse URL!"); return; } // IOException indicates network or I/O error catch (IOException ioe) { Systemerrprintln ("I/O Error : " + ioe); return; } } }
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How UsingHttpURLConnection Works The program starts by creating a URL object, and from this, a URLConnection object If the protocol being used to request the resource is HTTP, then the URLConnection will also be an instance of the HttpURLConnection class It is not advisable to presume that this will always be the case, however A guard statement checks to see if it is an HttpURLConnection object and performs a casting operation If not, an error message is displayed and the program terminates
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// Create a URLConnection object, for this URL // NOTE : no connection has yet been established URLConnection connection = myURLopenConnection(); // Check to see if connection is a HttpURLConnection instance if (connection instanceof javanetHttpURLConnection) { // Yes cast to a HttpURLConnection instance HttpURLConnection hConnection = (HttpURLConnection) connection; // Do something with hConnection } else { Systemerrprintln ("Invalid transport protocol - not http!"); return; }
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If all proceeds according to plan, the application now has an HttpURL Connection, and the extra HTTP-specific functionality it gives Before a connection is established, it is possible to modify the properties of the request For example, a different request method could be used, or the "follow redirection" flag could be modified So that users can see the redirection status code, automatic redirection is disabled by the application, and then the connection is established
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// Disable automatic redirection, to see the status header hConnectionsetFollowRedirects(false); // Connect to server hConnectionconnect();
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Once a connection has been established, all sorts of useful information becomes available, such as the status code and message and whether or not a proxy server is being used The application checks for the presence of a proxy server, and displays it to the user, by using the boolean HttpURLConnection usingProxy() method
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// Check to see if a proxy server is being used if (hConnectionusingProxy()) { Systemoutprintln ("Proxy server used to access resource"); } else { Systemoutprintln ("No proxy server used to access resource"); }
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Next, the status code and message are retrieved This is the most useful information of all, as it tells a client whether or not a request was successful and, if it was not successful, gives an indication of why The human-readable shortcut for the 200 status code (HttpURLConnectionHTTP_OK) is used to check whether the request was successful If not, the status code and message are displayed to the user, and an application could take further steps, such as resending a request or following a redirection notice
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// Get the status code int code = hConnectiongetResponseCode(); // Get the status message String msg = hConnectiongetResponseMessage(); // If a 'normal' response if ( code == HttpURLConnectionHTTP_OK ) { // Notify user Systemoutprintln ("Normal response returned : " + code + " " + msg ); } else { // Output status code and message Systemoutprintln ("Abnormal response returned : " + code + " " + msg ); }
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Running UsingHttpURLConnection The UsingHttpURLConnection application accepts as a single parameter the URL of the resource you want to investigate The syntax is as follows:
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