RandomAccessFile

      WRITE:
public static void randomWrite(String path){
        RandomAccessFile raf=null;
        try {
            raf = new RandomAccessFile(path, "rw");
            
            raf.seek(raf.length());
            raf.write("\r\n追加内容".getBytes());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    
    }

     READ:
        randomAccessFile.seek(this.randomAccessFile.length()-getRecordSize()-length);
        byte[] b = new byte[getRecordSize()];
        this.randomAccessFile.readFully(b);
        String line = new String(b, Config.DB_CHARACTER_ENCODING);