How to write a file transfer program in java

File Transfer between 2 computers with Java In this article we will learn how to transfer files between 2 computers using Java. You may transfer any file between any 2 systems in which one system acts as a Server and the other one act as a client. You can implement the logic in making a chat application with file transfer. Importing classes array0 Here java.

How to write a file transfer program in java

Serialization, in particular, refers to its representation as a sequence of bytes.

JDK7 Example

These bytes contains an object's data, type information of the object, and also the type of data content in the object. An object, once serialized, can be persisted in a file or used in an application that communicate via network.

The reverse process, called deserialization, is used to re-create the same object in memory from the stream of bytes. Data communication via objects rather than a sequence of bytes is convenient and efficient in both file handling and network communication.

Conceptually, serialization in network programming also follows the same idea. The Need for Objects to be Serialized Because serialization converts an object to a stream of bytes and deserialization re-creates the object in memory, the basic idea of operation remains the same as it in object persistence or a network transfer.

Note that serialization is not the only answer to transform objects into a stream of bytes but a standard and convenient way to do so. Otherwise, one had to re-create objects from the sequence of bytes from scratch in every application. For example, in a simple file handling program without serialization, when an instance variable for a certain object were to output to a disk file, the type information of object data gets lost.

That means, a value, say "55," is read back from a file, there is no way to tell if the value came from a Integer, a String, or a Double. Also, it is not possible to determine whether the separator used in the file between values is a space character or something else.

Are there single records in a line or multiple records per line in the file? This information is necessary for re-creating the object, especially by the program that reads the data.

If, however, the program knows the object type exactly, perhaps it's all right and possible to read into the correct object. But in practice, it's often not so.

It is not possible to know precisely how data is stored in a file unless type information of the object with its content are also maintained systematically in the file.

Implementing Object Serialization Serialization of a object starts with implementing a java. Then, to work with the serialized object, we have to initialize the ObjectInputStream and ObjectOutputStream objects with stream objects.

how to write a file transfer program in java

These objects read from and write to file stream objects, such as FileInputStream and FileOutputStream, respectively in case of file handling.

Both file stream and object streams are basically stream objects wrapped into one another for the purpose of object persistence in a file.

The stream object being created wraps another stream object specified as a constructor argument; for example, to wrap FileOuputStream in an ObjectOutputStream, we pass a FileOutputStream object to the ObjectOutputStream's constructor. The method writeObject, responsible for streaming object bytes, takes an object that implements a Serializable interface as an argument.

In a way, an object that implements a Serializable interface is tagged to transform into a sequence of bytes retaining not only the object values but also the type information of the object and its content as well.

how to write a file transfer program in java

Serialization acts as a tagging interface and does not have any method of its own. A serializable class must ensure that the instance variables of the class must also be serializable; if this is not so, they must be declared as transient to indicate non serializability and they should be ignored during the serializability process.

This situation occurs in cases such as in serializing reference types. All primitive types of variables in Java are serializable including array objects.

However, for some reference types or an array of reference types, it may occur that the referred object is not serializable. Object Serialization in a Sequential Access File Let us create and manipulate a simple sequential access file using object serialization to delineate the idea further.Oct 24,  · File transfer program in java using TCP made Simple - Duration: How to transfer data between two different jframe in java by Sagni How to read and write image file in Java.

This is a Java Program to Display the ATM Transaction. The user will choose from any one of the available options as input.

Different cases using switch case have been provided for different operations like withdraw, deposit and check balance. Hello I need to transfer a file over a socket, what i want is to transfer the name of the file then the file data.

i have a working server and client. Transferring file name then file data over socket (Java in General forum at Coderanch). This File Transfer and Chat Project in Java can be successfully operated in real environment and can be tested practically.

The files and chat messages can be sent to the selected clients. Even. exe files can be transferred correctly without any errors and are perfectly executed upon download.

Jan 08,  · Channels are the tube through which data is transferred and buffers are the source and target of those data transfer. In the case of a write, data you want to write is placed in a buffer, which is passed to a channel than channel read that data from the buffer and write into the file.

a sample Java program to read/write data from.

File Transfer and Chat Project Abstract:

Copy Data From One File to Another File in Java Example by Dinesh Thakur Category: Stream. We use two classes FileInputStream, FileOutputStream i.e to read data from one file and write it to another file. Create a File and Write Data in Java Example Java Program Which Can List All Files in a Given Directory | Java Example.

file transfer in java « Abhishek's Programming And Linux Solution Blog