Writing to an already existing file using FileWriter Java

Question

Is there anyway I can write to an already existing file using Filewriter

For example when the user clicks a submit button:

FileWriter writer = new FileWriter("myfile.csv");
writer.append("LastName");
writer.append(',');
writer.append("FirstName");
writer.append('/n');

writer.append(LastNameTextField.getText());
writer.append(',');
writer.append(FirstNameTextField.getText());

I want to be able to write new data into the already existing myfile.csv without having to recreate a brand new one every time

Do you want to append (write the new data at the end of the old), or replace (write the new data over the top of the old)? I would have thought append (as did the answerers so far), but "write new data into" sounds more like replace. — CPerkins
– CPerkins, Commented Jun 9, 2010 at 11:25

Geo · Accepted Answer · 2010-06-09 10:58:00Z

23

Yeah. Use the constructor like this:

FileWriter writer = new FileWriter("myfile.csv",true);

answered Jun 9, 2010 at 10:58

Geo

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1 Comment

Radu Over a year ago

@TwilightPonyInc. It's not quite pseudocode, it is the method declaration, but yeah! The code is ALWAYS much more useful!

Inv3r53 · Accepted Answer · 2010-06-09 10:58:57Z

7

FileWriter

public FileWriter(File file,
                  boolean append)
           throws IOException

Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.

answered Jun 9, 2010 at 10:58

Inv3r53

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