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Java copy file

There are for the most part 3 methods for duplicating documents utilizing java language. They are as given underneath:

  • Utilizing File Stream
  • Utilizing FileChannel Class
  • Utilizing Files class.

1. Using File Stream:

Here we are utilizing a document input stream to get input characters from the primary record and a document yield stream to compose yield characters to another document.

This is very much like seeing one document and composing onto another.

// Java Program to Copy record utilizing File Stream


// Bringing in input yield classes
import java.io.*;


// Primary Class
public class Copy {


  // Primary driver technique
  public static void main(String[] args)
    throws IOException
  {


    // Making two stream
    // one information and other result
    FileInputStream fis1 = invalid;
    FileOutputStream fos1 = invalid;


    // Attempt block to check for exemptions
    try {


      // Introducing both the streams with
      // separate record registry on neighborhood machine


      // Custom index way on neighborhood machine
      fis1= new FileInputStream("C:\\Users\\Bhoomika\\Desktop\\input1.txt");
      // Custom index way on neighborhood machine
      fos1 = new FileOutputStream( "C:\\Users\\Bhoomika\\Desktop\\output1.txt");
	int c1;
      // Condition check
      // Perusing the info record till there is input
      // present
      while ((c = fis1.read()) != - 1) {
       // Writing to yield document of the predefined
        // catalog
        fos1.write(c);
      }


      // At this point keeping in touch with the document has finished, so
     // Show message on the control center
      System.out.println( "replicated the document effectively");
    }
   // Discretionary at last catchphrase yet is great practice to
    // void the consumed space is suggested at whatever point
    // shutting files,connections,streams
    at last {
     // Shutting the streams
      in the event that (fis1 != invalid) {
     // Shutting the fileInputStream
        Fis1.close();
      }
      in the event that (fos1!= invalid) {
      // Shutting the fileOutputStream
        fos1.close();
      }
    }
  }

 2. Using FileChannel class:

This is a class present in java.nio, channels bundle and is utilized to compose, change, read records.

The objects of this class make a seekable document channel through which this large number of exercises are performed.

 This class basically gives two systems named as follows:

transferFrom(ReadableByteChannel src, long position, long count): Transfers bytes to the channel which calls this strategy from the src channel.

 This is called by genuine channel.

The position is the spot of a pointer from where the copy exercises are to be started.

Count determines the size of the record which is almost equivalent to how much happy it contains.

transferTo(long position, long count, WritableByteChannel target): Moves bytes from the source or strategy calling channel to the goal channel of the record.

This system is transcendently called using the source channel and Count determines the size of the source record and position from where the copy is to be made.

//program for understanding

// Java Program to Copy Files Using FileChannel Class


// Bringing in java.nio bundle for network connecting
// Bringing in input yield classes
import java.io.*;
import java.nio.channels.FileChannel;


// Fundamental Class
public class Copy2 {


  // Fundamental driver strategy
  public static void main(String[] args)
    throws IOException
  {
    // Making two channels one info and other result
    // by making two objects of FileChannel Class
    FileChannel src1 = new FileInputStream("C:\\Users\\Bhoomika\\Desktop\\input2.txt")
        .getChannel();
    FileChannel dest1
      = new FileOutputStream( "C:\\Users\\Bhoomika\\Desktop\\output2.txt")
        .getChannel();


    // Attempt block to check for exemptions
    try{


      // Moving documents in one go from source to
      // objective utilizing transferFrom() strategy
      dest1.transferFrom(src1, 0, src1.size());
      // we can likewise utilize transferTo
      // src1.transferTo(0,src1.size(),dest1);
    }


    // at long last watchword is great practice to save space in
    // memory by shutting documents, associations, streams
    finally{
      // Shutting the channels this makes the space
      // free
     // Shutting the source channel
      src1.close();
      // Shutting the objective channel
      dest1.close();
    }
  }
}

3. Using Files class:

This is a class present in java.nio.File bundle. This class gives 3 techniques to duplicate the documents which are as per the following:

copy(InputStream in, Path target): Copies all bytes of information from the information document stream to the result way of the result record.

 It can't be utilized to make a duplicate of a predetermined part in a source record. Here we are not expected to make a result record.

It is thusly made during the execution of the code.

copy(Path source, OutputStream out): Copies all bytes from not entirely set in stone in the manner source to the outcome stream of the outcome record.

copy(Path source, Path target): Copies reports using the method of both source and goal records

Don't bother making the result document here moreover.

//program for understanding

import java.nio.file.Files;
import java.io.*;
// save the record named as GFG.java
public class Copy3{


  // fundamental strategy
  public static void main(String[] args) throws IOException{


    // making two channels
    // one info and other result
    Record src2 = new File("C:\\Users\\Bhoomika\\Desktop\\input3.txt");
    Record dest2 = new File("C:\\Users\\Bhoomika\\Desktop\\output3.txt");


    // utilizing copy(InputStream,Path Target); technique
    Files.copy(src2.toPath(), dest2.toPath());


    // here we are not expected to have an
    // yield record at the predefined target.
    // same way we can utilize other technique too.


  }
}

File copy() methods:

The duplicate() strategy for java.nio.file.Files Class is utilized to duplicate bytes from a document to I/O streams or from I/O streams to a record. I/O Stream implies an information source or result objective addressing various kinds of sources for example circle documents.

Methods

In view of the kind of contentions passed, the Files class gives 3 sorts of duplicate() technique.

  • Utilizing copy(InputStream in, Path target, CopyOption… choices) Method
  • Utilizing copy(Path source, OutputStream out) Method
  • Utilizing copy(Path source, Path target, CopyOption… choices) Method
  • Utilizing copy(InputStream in, Path target, CopyOption… choices) Method:
  • This technique is utilized to duplicate all bytes from an info stream to a record.

Boundaries:

  • in: The info stream whose the information will be replicated
  • focus on: The way of the document where information will be replicated
  • choices: Options portraying the manners by which the information will be replicated

Return Type: Number of replicated bytes

Exceptions:

  • IOException: If while perusing or composing a mistake happened
  • FileAlreadyExistsException: If the objective record as of now exists and can not be supplanted
  • DirectoryNotEmptyException: If the objective document can not be supplanted in light of the fact that it is a non-void registry
  • UnsupportedOperationException: If the approach to replicating portrayed by a choice isn't upheld
  • SecurityException: If the compose admittance to the objective record is denied by the security supervisor

Utilizing copy(Path source, OutputStream out) Method

This strategy is utilized to duplicate all bytes from a document to a result stream.

  • Boundaries: It takes two to be specific
  • source: The way of the document whose information will be duplicated
  • out: The result stream where the replicated information will be composed
  • Bring Type back: Number of duplicated bytes

Exceptions:

  • IOException: If while perusing or composing a blunder happened
  • SecurityException: If the read admittance to the objective record is denied by the security chief

Utilizing copy(Path source, Path target, CopyOption… choices) Method:

This strategy is utilized to duplicate a document to an objective record.

Boundaries:

  • source: The way of the document whose information will be duplicated
  • focus on: The way of the record where information will be replicated
  • choices: Options depicting the manners by which the information will be duplicated
  • Bring Type back: The way to the document where information is replicated

Special cases:

  • IOException: If while perusing or composing a blunder happened
  • FileAlreadyExistsException: If the objective record as of now exists and can not be supplanted
  • DirectoryNotEmptyException: If the objective document can not be supplanted on the grounds that it is a non-void registry
  • UnsupportedOperationException: If the approach to duplicating depicted by a choice isn't upheld
  • SecurityException: If the compose admittance to the objective document is denied by the security director



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