public void method1() { FileWriter fw = null; try { //如果文件存在,则追加内容;如果文件不存在,则创建文件 File f=new File("E:\dd.txt"); fw = new FileWriter(f, true); } catch (IOException e) { e.printStackTrace(); } PrintWriter pw = new PrintWriter(fw); pw.println("追加内容"); pw.flush(); try { fw.flush(); pw.close(); fw.close(); } catch (IOException e) { e.printStackTrace(); } }