How to Read Streaming Data From a File in Java

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How to read data from one file and print to some other file in Java?

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Coffee provides I/O Streams to read and write data where a Stream represents an input source or an output destination which could be a file, i/o devise, other programs, etc.

In general, a Stream will be an input stream or, an output stream.

• InputStream − This is used to read data from a source.

• OutputStream − This is used to write data to a destination.

Based on the data they handle there are ii types of streams −

• Byte Streams − These handle data in bytes (8 bits) i.east., the byte stream classes read/write data of 8 $.25. Using these you lot tin can store characters, videos, audios, images, etc.

• Grapheme Streams − These handle data in 16 bit Unicode. Using these you can read and write text information but.

The following diagram illustrates all the input and output Streams (classes) in Java.

Among these, you can read the contents of a file using Scanner, BufferedReader and, FileReader classes.

In the same way, you can write data into a file using BufferedWriter, FileOutputStream, FileWriter.

Writing contents of one file to other

Following is a Coffee program that reads information from a file to a Cord using the Scanner class and writes it to some other file using the FileWriter class.

Example

import java.io.File; import java.io.FileInputStream; import java.io.FileWriter; import java.io.IOException; import java.util.Scanner; public grade CopyContent {    public static void chief(String[] args) throws IOException {       //Instantiating a file grade       File file = new File("D:\\sampleData.txt");       //Instantiate an FileInputStream course       FileInputStream inputStream = new FileInputStream(file);       //Instantiating the Scanner grade       Scanner sc = new Scanner(inputStream);       //StringBuffer to store the contents       StringBuffer buffer = new StringBuffer();       //Appending each line to the buffer       while(sc.hasNext()) {          buffer.append(" "+sc.nextLine());       }       System.out.println("Contents of the file: "+buffer);       //Creating a File object to hold the destination file       File dest = new File("D:\\outputFile.txt");       //Instantiating an FileWriter object       FileWriter writer = new FileWriter(dest);       //Writing content to the destination       writer.write(buffer.toString());       writer.flush();       Arrangement.out.println("File copied successfully.......");    } }

Output

Contents of the file: Tutorials Point originated from the idea that there exists a  class of readers who respond better to online content and prefer to learn new skills  at their own pace from the comforts of their cartoon rooms. The journey commenced  with a single tutorial on HTML in 2006 and elated by the response it generated,  we worked our fashion to adding fresh tutorials to our repository which now proudly  flaunts a wealth of tutorials and allied articles on topics ranging from programming  languages to spider web designing to academics and much more. 40 1000000 readers read 100  meg pages every calendar month. Our content and resource are freely available and we prefer  to continue it that way to encourage our readers learn as many skills as they would like to.  We don't force our readers to sign up with us or submit their details either.  No preconditions and no impediments. Simply Easy Learning! File copied successfully.......

Published on 10-Sep-2019 12:38:xl

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Source: https://www.tutorialspoint.com/how-to-read-data-from-one-file-and-print-to-another-file-in-java

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