// 获取当前日期和时间                Calendar cal = Calendar.getInstance();                String fileName = cal.get(Calendar.YEAR) + "_" + cal.get(Calendar.MONTH) + "_"                        + cal.get(Calendar.DAY_OF_MONTH) + ".txt";                FileWriter fileWriter = new FileWriter(new File(filePath + "/" + fileName), true);                String log = "restart at: " + cal.get(Calendar.HOUR_OF_DAY) + ":"                        + cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND);                BufferedWriter bufferWriter = new BufferedWriter(fileWriter);                // attention 换行需要以下两个一起才会在.txt文件中生效                bufferWriter.write(log + "\r\n");                bufferWriter.newLine();                bufferWriter.close();                fileWriter.close();