Read File in String Using Java BufferedInputStream Example

public static String readFile(String fileName){
    File file = new File(fileName);
    BufferedInputStream bin = null;
 
    try
    {
    //create FileInputStream object
        FileInputStream fin = new FileInputStream(file);
 
    //create object of BufferedInputStream
        bin = new BufferedInputStream(fin);
 
    //create a byte array
        byte[] contents = new byte[1024];
 
        int bytesRead=0;
        String strFileContents;
        StringBuffer buf= new StringBuffer();
 
        while( (bytesRead = bin.read(contents)) != -1){
 
            strFileContents = new String(contents, 0, bytesRead);
            buf.append(strFileContents)
            System.out.print(strFileContents);
        }
         return buf.toString();
    }
    catch(FileNotFoundException e)
    {
        System.out.println("File not found" + e);
    }
    catch(IOException ioe)
    {
    System.out.println("Exception while reading the file "
    + ioe);
    }
    finally
    {
    //close the BufferedInputStream using close method
    try{
    if(bin != null)
        bin.close();
        return String.Empty();
    }catch(IOException ioe)
    {
        System.out.println("Error while closing the stream :"
        + ioe);
        return String.Empty();
    }
     
  }
}

File name can be "C://FileIO//ReadFile.txt".

Java: read a text file line by line

This class reads a text file line by line and echos the contents to standard out.

Here we have used BufferedReader to do this.

import java.io.*;

public static String readFile(String fileName)
// nested initialization,         
// or in design pattern jargon, decorate FileInputStream with        
// BufferedInputStream.        
BufferedReader in = new BufferedReader(new FileReader(fileName));
    try {
            // read file line by line
            String line = in.readLine();
            while (line != null) {
                printLine(line);
                line = in.readLine();
            }
        }
        finally {
      // always close input stream
            in.close();
        }
    }
    private static void printLine(String line) {
        System.out.println(line);
    }