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Java Articles
Page 48 of 450
Provider getInfo() method in Java
An easily readable description of the provider and its services can be obtained using the method getInfo() in the class java.security.Provider. This method requires no parameters and it returns a provider and services description.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) throws Exception { try { SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG"); Provider p = sRandom.getProvider(); System.out.println("The information is as follows:"); System.out.println(p.getInfo()); } catch (NoSuchAlgorithmException ...
Read MoreProvider getName() method in Java
The name of the provider can be obtained using the getName() method in the class java.security.Provider. This method requires no parameter and it returns the name of the provider as required.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) { try { KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance("DSA"); Provider p = kpGenerator.getProvider(); System.out.println("The Provider is: " + p.getName()); } catch (NoSuchAlgorithmException e) { ...
Read MoreProvider getVersion() method in Java
The version number of the provider can be obtained using the method getVersion() in the class java.security.Provider. This method requires no parameter and it returns the version number of the provider as required.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) { try { KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance("DSA"); Provider p = kpGenerator.getProvider(); System.out.println("The version number is: " + p.getVersion()); } catch (NoSuchAlgorithmException e) { ...
Read MoreProvider toString() method in Java
The name and the version number of the provider in string form can be obtained using the method toString() in the class java.security.Provider. This method requires no parameters and it returns the name as well as the version number of the provider in string form.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) { try { KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance("DSA"); Provider p = kpGenerator.getProvider(); System.out.println("The name and version number of the ...
Read MoreProvider getService() method in Java
The service that can describe the implementation of a Provider in regards to any algorithm is obtained using the method getService() in the class java.security.Provider. This method requires two parameters i.e. the service type required and the algorithm name of the required service.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) throws Exception { try { Signature sign = Signature.getInstance("SHA256withDSA"); Provider p = sign.getProvider(); Provider.Service s = p.getService("Signature", sign.getAlgorithm()); ...
Read MoreProvider values() method in Java
The property values in the Provider can be viewed with an unmodifiable Collection view that is obtained using the method values() in the class java.security.Provider. This method requires no parameters and it returns an unmodifiable Collection view of the property values.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) throws Exception { try { Signature sign = Signature.getInstance("DSA"); Provider p = sign.getProvider(); Collection val = p.values(); Iterator ...
Read MoreHow to write a switch statement in a JSP page?
Following is the example of using a switch statement within a JSP page. SWITCH...CASE Example The above code will generate the following result −It's Wednesday.
Read MoreHow to write an if-else statement in a JSP page?
The if...else block starts out as an ordinary Scriptlet, but the Scriptlet is closed at each line with HTML text included between the Scriptlet tags.Example IF...ELSE Example Today is weekend Today is not weekend The above code will generate the following result −Today is not weekend
Read MoreHow to delete cookies with JSP?
To delete cookies is very simple. If you want to delete a cookie, then you simply need to follow these three steps −Read an already existing cookie and store it in Cookie object.Set cookie age as zero using the setMaxAge() method to delete an existing cookie.Add this cookie back into the response header.Following example will show you how to delete an existing cookie named "first_name" and when you run main.jsp JSP next time, it will return null value for first_name.Example Reading Cookies Reading ...
Read MoreWhere will be the uploaded files stored in JSP?
A JSP can be used with an HTML form tag to allow users to upload files to the server. An uploaded file can be a text file or a binary or an image file or just any document.Creating a File Upload FormLet us now understand how to create a file upload form. The following HTML code creates an uploader form. Following are the important points to be noted down −The form method attribute should be set to POST method and the GET method cannot be used.The form enctype attribute should be set to multipart/form-data.The form action attribute should be set ...
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