check file exists java

Question

I want create text file but if the file already exists it should not create new file but should append the text to the content (at the end) of the existing file. How can I do it in Java?

for every one second I'm reading data from inputstream when i stop reading and again i start reading data at that time i should write to same file if file already exist

does I have to check the condition:

if(file.exists){

} else{
   new File();
}

What I have to do?

Answer 1

You can use the following code to append to a file which already exists -

try {
    BufferedWriter out = new BufferedWriter(new FileWriter("filename", true));
    out.write("data");
    out.close();
} catch (IOException e) { }

If the second argument in FileWriter's constructor is true, then bytes will be written to the end of the file rather than the beginning.

Quoting Stephen's comment:

...passing true as the 2nd argument causes the file to be created if it doesn't exist and to be opened for appending if it does exist.