In this example, we will see a sample program to copying the contents of one text file to another in Java.
package com.javatechig;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class CopyFileContent {
public static void main(String[] args) {
/* Source file, from which content will be copied */
File sourceFile = new File("file1.txt");
/* destination file, where the content to be pasted */
File destFile = new File("file2.txt");
/* if file not exist then create one */
if (!destFile.exists()) {
try {
destFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
InputStream input = null;
OutputStream output = null;
try {
/* FileInputStream to read streams */
input = new FileInputStream(sourceFile);
/* FileOutputStream to write streams */
output = new FileOutputStream(destFile);
byte[] buf = new byte[1024];
int bytesRead;
while ((bytesRead = input.read(buf)) > 0) {
output.write(buf, 0, bytesRead);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
finally {
try {
if (null != input) {
input.close();
}
if (null != output) {
output.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}