how to generate barcode in asp net core

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Notice private data fields exist for the first three properties, but not for the fourth, which is calculated on demand This underscores that what counts is the existence of the get and set methods These methods are the only face the bean shows to the outside world Classes interested in changes in a bean s state can implement one of the many EventListener interfaces When a class is registered as an event listener, it receives callbacks when events of interest happen in the bean This makes it possible for beans to act cooperatively to accomplish larger tasks The AWT and Swing GUI architectures make extensive use of this event model Beans used in server-side environments, however, tend to be used mainly as property repositories and don t typically implement support for event listeners

That being the case, a bean must provide some way for its state to persist in between times in which it is active, even in different Java virtual machines This is accomplished by having the bean implement either the Serializable or the Externalizable interface Serialization refers to the process of converting objects to a stream of bytes that can be stored in a file or transmitted across a network The complementary process of reassembling the objects from the byte stream is called deserialization The Java API provides ObjectOutputStream and ObjectInputStream classes designed for this purpose An object is serialized by being written to an ObjectOutputStream with the output stream s writeObject() method For example, a program that contains a Mortgage bean can serialize it as follows:

OutputStream fileOut = new FileOutputStream("mortgageser"); ObjectOutputStream objOut = new ObjectOutputStream(fileOut); objOutwriteObject(mortgageBean); objOutflush(); fileOutclose();

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Later, this or any other program can reconstitute the Mortgage bean from the mortgageser file using the readObject() method of an ObjectInputStream:

InputStream fileIn = new FileInputStream("mortgageser"); ObjectInputStream objIn = new ObjectInputStream(fileIn);

Mortgage mortgageBean = null; try { mortgageBean = (MortgageBean) objInreadObject(); } catch (ClassNotFoundException e) { // handle exception }

In these two code snippets, only one object is being serialized, and it s being serialized to a file Serializing multiple objects is just as easy; there are simply multiple calls to objOutwriteObject() As long as the program that deserializes the object(s) knows the correct number of objects and their types, it can read them with multiple calls to objInreadObject() Similarly, the backing stream needn t be a file it can be a socket, a byte array, or punched cards, if the virtual machine supports them Note: the Mortgage class needn t do anything special to be serialized; it only needs to implement the Serializable interface Ordinarily, the servlet engine takes care of all the logic needed to store session and application beans when the servlet engine is terminated, and restoring them when it s restarted One exception exists, however Not all objects are serializable For example, a database connection cannot be put into suspended animation and reawakened later Its very nature requires it to be in communication with a corresponding object in the database management system Likewise, threads are tied to underlying operating system threads and cannot simply be dematerialized and rematerialized In these cases, the object containing nonserializable objects must provide a means for them to be reconnected or restarted Moreover, it must declare variable references to those objects with the keyword transient to prevent the normal serialization process from attempting to handle them A class that contains transient objects should restore them by providing a method with this signature:

The main difference is the addition of the name attribute This required a name variable and a setName() method be created Then, rather than

String webserver = congetHeaderField("server");

String header = congetHeaderField(name);

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