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Thursday, 28 June 2018

Apache Commons IO - IOUtils

Apache Commons IO - IOUtils


Provides utility methods for reading, writing and copying files. The methods work with InputStream, OutputStream, Reader and Writer.

Class Declaration

Following is the declaration for org.apache.commons.io.IOUtils Class −
public class IOUtils
   extends Object

Features

  • Provides static utility methods for input/output operations.
  • toXXX() − reads data from a stream.
  • write() − write data to a stream.
  • copy() − copy all data to a stream to another stream.
  • contentEquals − compare the contents of two streams.

Example of IOUtils Class

Here is the input file we need to parse −
Welcome to TutorialsPoint. Simply Easy Learning.
IOTester.java
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.commons.io.IOUtils;

public class IOTester {
   public static void main(String[] args) {
      try {
         //Using BufferedReader
         readUsingTraditionalWay();

         //Using IOUtils
         readUsingIOUtils();
      } catch(IOException e) {
         System.out.println(e.getMessage());
      }
   }

   //reading a file using buffered reader line by line
   public static void readUsingTraditionalWay() throws IOException {
      try(BufferedReader bufferReader 
         = new BufferedReader( new InputStreamReader(  
            new FileInputStream("input.txt") ) )) {
         String line;
         while( ( line = bufferReader.readLine() ) != null ) {
            System.out.println( line );
         }
      }
   }

   //reading a file using IOUtils in one go
   public static void readUsingIOUtils() throws IOException {
      try(InputStream in = new FileInputStream("input.txt")) {
         System.out.println( IOUtils.toString( in , "UTF-8") );
      }
   }
}

Output

It will print the following result.
Welcome to TutorialsPoint. Simply Easy Learning.
Welcome to TutorialsPoint. Simply Easy Learning.

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