Overwrite to file

Question

I am writing a simple function like this:

private static void write(String Swrite) throws IOException { if(!file.exists()) { file.createNewFile(); } FileOutputStream fop=new FileOutputStream(file); if(Swrite!=null) fop.write(Swrite.getBytes()); fop.flush(); fop.close(); } 

Every time I call him, he writes, and then I just get the latest notes that are written. How can I change it so as not to overwrite? The file variable is defined globally as file .

Answer 1

In your FileOutputStream constructor FileOutputStream you need to add the boolean append parameter. It will look like this:

 FileOutputStream fop = new FileOutputStream(file, true); 

This tells FileOutputStream that it should add the file instead of clearing and overwriting all of its current data.

Answer 2

Use constrctor, which takes the append flag as a parameter.

 FileOutputStream fop=new FileOutputStream(file, true); 

Answer 3

you should open the file in append mode for this, by default FileOutputStream opens the file in write mode. And you do not need to check the existence of file , this will be done implicitly by FileOutputStream

 private static void write(String Swrite) throws IOException { FileOutputStream fop=new FileOutputStream(file, true); if(Swrite!=null) fop.write(Swrite.getBytes()); fop.flush(); fop.close(); } 

Answer 4

Try RandomAccessFile if you are trying to write with some byte offsets.

Answer 5

Constructor for towing parameters. And this is redundant:

 if(!file.exists()) { file.createNewFile(); } 

The designer will do it for you.