File Writer overrides previous write Java

问题

try {
                File file = new File(filePath+"usedcommands.txt");
                if (!file.exists()) {
                    file.createNewFile();
                }
                FileWriter fw = new FileWriter(file.getAbsoluteFile());
                BufferedWriter bw = new BufferedWriter(fw);
                bw.write(input+"\n");
                bw.close();
            } catch(Exception e) { System.out.println("can't write to usedcommands.txt..."); }

I'm writing to a txt file, but every time I run through the writing process it overrides what is already written there. How can I change my code so this part of the program doesn't override what is already there?

回答1:

Pass true as a second argument to FileWriter to turn on "append" mode.

FileWriter fw = new FileWriter(file.getAbsoluteFile(), true);

回答2:

Use this it will work

fw = new FileWriter("fileName",true);

for more details on FileWriter see this

来源：https://stackoverflow.com/questions/21537025/file-writer-overrides-previous-write-java