File Reader example in JRuby
In this section of JRuby tutorial we will study to Read
File in JRuby. We can read and write file on the console or in a file with
the JRuby. Here in our example we are reading a text file and printing its
content on the console.
FileReaderExample will take the input from the text
file JRubyFile.txt and then by reading it line by line, print its content on
your console as output. Here is the JRubyFile.txt as follows:
JRubyFile.txt
Hello ! Welcome to RoseIndia Technologies.
1. Amit Kumar Raghuwanshi
2. Vineet Bansal
3. Sandeep Suman
4. Vinod Kumar
|
FileReaderExample.rb
require "java"
include_class "java.io.BufferedReader"
include_class "java.io.FileReader"
fileReader = FileReader.new "JRubyFile.txt"
bufferReader = BufferedReader.new fileReader
str = bufferReader.readLine
while str
puts str.to_s
str = bufferReader.readLine
end |
In the above example code of FileReaderExample,
first line require "java" shows that we are making our JRuby
program enable to use java classes.
include_class "java.io.BufferedReader"
include_class "java.io.FileReader" |
Above lines of code will include java classes FileReader
and BufferedReader in our program. It's like importing class in Java
program.
fileReader = FileReader.new "JRubyFile.txt" will create a new instance of
class FileReader with taking JRubyFile.txt as its argument.
To read line we have used BufferedReader's method readLine.
bufferReader = BufferedReader.new fileReader
str = bufferReader.readLine
while str
puts str.to_s
str = bufferReader.readLine
end |
Above lines of code will create an instance of BufferedReader
class and then we have to read first line of text file with the readLine
method. For reading whole text file we have used while-loop in our
program.
Here is the output of the FileReaderExample as
generated on your screen:
Output:
C:\JRuby>jruby FileReaderExample.rb
Hello ! Welcome to RoseIndia Technologies.
1. Amit Kumar Raghuwanshi
2. Vineet Bansal
3. Sandeep Suman
4. Vinod Kumar
|
Download Source Code
|
Del.icio.us
Digg
Google
Spurl
Blink
Furl
Simpy
Y! MyWeb
