File Writer会覆盖以前的Java [英] File Writer overrides previous write Java

问题描述

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..."); }

我正在写一个txt文件，但每次我完成写入过程都会覆盖它什么已经写在那里。如何更改我的代码，以便程序的这一部分不会覆盖已存在的代码？

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?

推荐答案

将true传递为FileWriter打开追加模式的第二个参数。

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

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

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