java read and write file code example
Example 1: writing to a file in java
import java.io.FileWriter;
import java.io.IOException;
public class WriteToFile {
public static void main(String[] args) {
try {
FileWriter myWriter = new FileWriter("filename.txt");
myWriter.write("Files in Java might be tricky, but it is fun enough!");
myWriter.close();
System.out.println("Successfully wrote to the file.");
} catch (IOException e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
}
}
Example 2: write file java
@Test
public void givenUsingJava7_whenWritingToFile_thenCorrect()
throws IOException {
String str = "Hello";
Path path = Paths.get(fileName);
byte[] strToBytes = str.getBytes();
Files.write(path, strToBytes);
String read = Files.readAllLines(path).get(0);
assertEquals(str, read);
}
Example 3: java write to file
PrintWriter writer = new PrintWriter("the-file-name.txt", "UTF-8");
writer.println("The first line");
writer.println("The second line");
writer.close();
Example 4: How do you write or read data from or to file with Java?
Read data: I can use classes bufferedReader and bufferwriter.
Lets say I have a text in Java.
I use bufferedReader to read the files if it is a random file
bufferedReader is only the functionality to read a file.
For, Excel files I use the special library, Apache POI library.
These are external libraries.
I use properties class to read the properties files.
Scanner class also for read the data from files