使用RandomAccessFile向文件尾端追加内容

    @Test
    public void BufferReaderTest() throws FileNotFoundException{
        //System.in为字节流，需要使用InputStreamReader转成字符流
        InputStreamReader isr = new InputStreamReader(System.in);
        //把普通Reader包装成BufferedReader(具有缓冲功能，能按行读取)
        BufferedReader br = new BufferedReader(isr);
        //使用构造器RandomAccessFile，文件和文件的访问模式
        RandomAccessFile raf = new RandomAccessFile(new File("D:/RUNNING_COPY.txt"), "rw");    
        String line = null;
        try {
            //循环逐行读取
            while((line = br.readLine())!=null){
                if (line.equals("exit")) {
                    System.exit(1);
                }
                //记录指正移动到最后
                raf.seek(raf.length());
                //写入内容
                raf.write((line+"\r\n").getBytes());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                br.close();
                isr.close();
                raf.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }