Java write to file line by line

Java write to file line by line

Java write to file line by line is often needed in our day to day projects for creating files through java. There are various classes present in Java which can be used for write to file line by line.

Java write to file line by line using FileOutputStream class

FileOutputStream class is an output stream used for writing data to a File or FileDescriptor. FileOutputStream class is used to write streams of raw bytes such as image data. This class is good to use with bytes of data which cannot be represented as text such as excel document, PDF files, image files etc.

FileOutputStream class is part of the java.io package and it is a subclass of OutputStream class.

java write to file line by line

Java Program : Write to file line by line using FileOutputStream class

// Java Program for Write to file line by line using FileOutputStream class

import java.io.File;
import java.io.FileOutputStream;


public class ExampleJavaFileWrite {

public static void main(String[] args) {

//Declaring reference of File class
File file = null;

//Declaring reference of FileOutputStream class
FileOutputStream fileOutStream = null;

String data = "TechBlogStation";

try {
file = new File("D:/TBS/file.txt");

//Creating Object of FileOutputStream class
fileOutStream = new FileOutputStream(file);

//In case file does not exists, Create the file
if (!file.exists()) {
file.createNewFile();
}

//fetching the bytes from data String
byte[] b = data.getBytes();

//Writing to the file
fileOutStream.write(b);

//Flusing the stream
fileOutStream.flush();

//Closing the strean
fileOutStream.close();

System.out.println("File writing done.");

} 
//Handing Exception
catch (Exception e) {
e.printStackTrace();
}finally {
try {
if (fileOutStream != null) {
fileOutStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

}

Java write to file line by line using FileWriter class

FileWriter class creates a writer which can be used to write to a file line by line. FileWriter class is part of the java.io package and it is a subclass of   Writer class.

FileWriter creation is not dependent on whether file exists or not . In case file does not exist, FileWriter class will create the file before opening it for output at the time of object creation. In the case , where you  are attempting to open a read-only file , an IO Exception will be thrown.

java write to file line by line

Java Program : Write to file line by line using FileWriter class

// Java Program for Write to file line by line using FileWriter class

import java.io.File;
import java.io.FileWriter;


public class ExampleJavaFileWrite {

public static void main(String[] args) {

//Declaring reference of File class
File file = null;

//Declaring reference of FileWriter class
FileWriter filewriter = null;

String data = "TechBlogStation";

try {
file = new File("D:/TBS/file.txt");

//Creating Object of FileWriter class
filewriter = new FileWriter(file);

//Writing to the file
filewriter.write(data);

//Closing the stream
filewriter.close();

System.out.println("File writing done.");

} 
//Handing Exception
catch (Exception e) {
e.printStackTrace();
}finally {
try {
if (filewriter != null) {
filewriter.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

}

Java write to file line by line using PrintWriter class

PrintWriter is a character oriented version of PrintStream class. Java’s PrintWriter object supports both the print() and println() method for all types even including object. If the calling argument is not a simple type, the printwriter will call the object’s toString() method and then print out the output.

PrintWriter class is part of the java.io package and it is a subclass of   Writer class.

java write to file line by line

Java Program : Write to file line by line using PrintWriter class

// Java Program for Write to file line by line using PrintWriter class

import java.io.File;
import java.io.PrintWriter;
import java.io.FileWriter;


public class ExampleJavaFileWrite {

public static void main(String[] args) {

//Declaring reference of File class
File file = null;

PrintWriter pw = null;


try {

//Creating object of PrintWriter class
pw = new PrintWriter(new FileWriter("file.txt"));

String data = "TechBlogStation";

//Writing to the file
pw.write(data);

//Closing the stream
pw.close();

System.out.println("File writing done.");

} 
//Handing Exception
catch (Exception e) {
e.printStackTrace();
}finally {
try {
if (pw != null) {
pw.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

}

OutputStreamWriter class

An OutputStreamWriter acts as a bridge from character streams to byte streams: Characters written to it will be encoded into bytes using a charset

OutputStreamWriter class is part of the java.io package and it is a subclass of   Writer class.

java write to file line by line

OutputStreamWriter class Example:

// Java Program for Write to file line by line using OutputStreamWriter class

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;


public class ExampleJavaFileWrite {

public static void main(String[] args) {

//Declaring reference of File class
File file = null;

//Declaring reference of FileOutputStream class
FileOutputStream fos = null;

//Declaring reference of OutputStreamWriter class
OutputStreamWriter osw = null;


try {

file = new File("result.txt");

//Creating object of FileOutputStream class
fos = new FileOutputStream(file);

//Creating object of OutputStreamWriter class
osw = new OutputStreamWriter(fos);

String data = "TechBlogStation";

//Writing to the file
osw.write(data);

//Closing the strean
osw.close();

System.out.println("File writing done.");

} 
//Handing Exception
catch (Exception e) {
e.printStackTrace();
}finally {
try {
if (osw != null) {
osw.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

}

Java write to file line by line using BufferedWriter

It will write text to a character-output stream, buffering characters  to provide for the effective writing of single characters and strings.

A BufferedWriter is a Writer that adds a flush method which can be used to ensure that the data buffers are physically written to the actual output stream. BufferedWriter can increase the performance by reducing the number of times data is written to output stream.

BufferedWriter class is part of the java.io package and it is a subclass of   Writer class.

java write to file line by line

Java Program : Write to file line by line using BufferedWriter

// Java Program for Write to file line by line using BufferedWriter class

import java.io.File;
import java.io.FileWriter;
import java.io.BufferedWriter;


public class ExampleJavaFileWrite {

public static void main(String[] args) {

//Declaring reference of File class
File file = null;

//Declaring reference of BufferedWriter class
BufferedWriter bw = null;

//Declaring reference of FileWriter class
FileWriter fw = null;



try {

file = new File("result.txt");

//Creating object of FileWriter class
fw = new FileWriter(file);

//Creating object of BufferedWriter class
bw = new BufferedWriter(fw);

String data = "TechBlogStation";

//Writing to the file
bw.write(data);

//Closing the strean
bw.close();

System.out.println("File writing done...");

} 
//Handing Exception
catch (Exception e) {
e.printStackTrace();
}finally {
try {
if (bw != null) {
bw.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

}

Conclusion

We have learnt about various ways of writing file line by line. Any of the way can be used as per requirement to write to file. Now it will be easy to write a program for you using any of these ways.

 

For more interview questions and answers for Java : Go here .

For complete understanding of BigDecimal in Java : Go here .

For other Java concepts : Go here .

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