File file = new File("D:/test/test.txt");
    BufferedReader reader = null;
    int buffSize = 4096;
    try {
      reader = new BufferedReader(new FileReader(file), buffSize);
      String line;
      reader.mark(((int) file.length()) + buffSize);
      while ((line = reader.readLine()) != null) {
        System.out.println(line);
      }
      reader.reset();
      System.out.println("=============================");
      System.out.println(reader.readLine());
    } catch (Exception ex) {
      ex.printStackTrace();
    } finally {
      if (reader != null) {
        try {
          reader.close();
        } catch (Exception ex) {
        }
      }
    }

------解决方案--------------------
探讨


不太熟，先mark然后reset也许可以，毕竟不清楚是否实现了这个功能，但他要做了也很容易操作

mark
public void mark(int readAheadLimit)
          throws IOException
Marks the present position in the stream. Subsequent calls to reset() will……


------解决方案--------------------
close之前的BufferReader  然后再new BufferReader  就回溯到文件头