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manjiri
How to format text file?
1 Answer(s)      5 years and 10 months ago
Posted in : Java Beginners



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December 17, 2008 at 4:30 AM


Hi friend,


I am sending running code. I hope that this code will help you.



import java.io.*;

public class ReadWriteTextFile {

static public String getContents(File aFile) {
StringBuilder contents = new StringBuilder();

try {

BufferedReader input = new BufferedReader(new FileReader(aFile));
try {
String line = null; //not declared within while loop

while (( line = input.readLine()) != null){
contents.append(line);
contents.append(System.getProperty("line.separator"));
}
}
finally {
input.close();
}
}
catch (IOException ex){
ex.printStackTrace();
}

return contents.toString();
}


static public void setContents(File aFile, String aContents)
throws FileNotFoundException, IOException {
if (aFile == null) {
throw new IllegalArgumentException("File should not be null.");
}
if (!aFile.exists()) {
throw new FileNotFoundException ("File does not exist: " + aFile);
}
if (!aFile.isFile()) {
throw new IllegalArgumentException("Should not be a directory: " + aFile);
}
if (!aFile.canWrite()) {
throw new IllegalArgumentException("File cannot be written: " + aFile);
}

//use buffering
Writer output = new BufferedWriter(new FileWriter(aFile));
try {
//FileWriter always assumes default encoding is OK!
output.write( aContents );
}
finally {
output.close();
}
}

public static void main(String args[]) throws IOException {
File testFile = new File("/home/vinod/amarexamples/anju.txt");
System.out.println("Original file contents: " + getContents(testFile));
setContents(testFile, "The content of this file has been overwritten...");
System.out.println("New file contents: " + getContents(testFile));
}
}

-----------------------------------------

Visit for more information.

http://www.roseindia.net/java/example/java/io/java-read-file-line-by-line.shtml

Thanks.


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