1. package cn.com.songjy.test.io;
2. import java.io.FileNotFoundException;
3. import java.io.IOException;
4. import java.io.RandomAccessFile;
5. /**
6. * http://bbs.csdn.net/topics/190181198
7. * 從最後一行開始讀取
8. */
9. public class FromEndRF {
10. /**
11. *
12. * @param filename 目標檔案
13. * @param charset 目標檔案的編碼格式
14. */
15. public static void read(String filename, String charset) {
16. RandomAccessFile rf = null;
17. try {
18. rf = new RandomAccessFile(filename, "r");
19. long len = rf.length();
20. long start = rf.getFilePointer();
21. long nextend = start + len - 1;
22. String line;
23. rf.seek(nextend);
24. int c = -1;
25. while (nextend > start) {
26. c = rf.read();
27. if (c == '\n' || c == '\r') {
28. line = rf.readLine();
29. if (line != null) {
30. System.out.println(new String(line
31. .getBytes("ISO-8859-1"), charset));
32. } else {
33. System.out.println(line);
34. }
35. nextend--;
36. }
37. nextend--;
38. rf.seek(nextend);
39. if (nextend == 0) {// 當檔案指標退至檔案開始處，輸出第一行
40. // System.out.println(rf.readLine());
41. System.out.println(new String(rf.readLine().getBytes(
42. "ISO-8859-1"
    ), charset));
43. }
44. }
45. } catch (FileNotFoundException e) {
46. e.printStackTrace();
47. } catch (IOException e) {
48. e.printStackTrace();
49. } finally {
50. try {
51. if (rf != null)
52. rf.close();
53. } catch (IOException e) {
54. e.printStackTrace();
55. }
56. }
57. }
58. public static void main(String args[]) {
59. read("mynewfile.txt", "UTF-8");
60. }
61. }

package cn.com.songjy.test.io;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;

/**
 * http://bbs.csdn.net/topics/190181198
 * 從最後一行開始讀取
 */
public class FromEndRF {

	/**
	 * 
	 * @param filename 目標檔案
	 * @param charset 目標檔案的編碼格式
	 */
	public static void read(String filename, String charset) {

		RandomAccessFile rf = null;
		try {
			rf = new RandomAccessFile(filename, "r");
			long len = rf.length();
			long start = rf.getFilePointer();
			long nextend = start + len - 1;
			String line;
			rf.seek(nextend);
			int c = -1;
			while (nextend > start) {
				c = rf.read();
				if (c == '\n' || c == '\r') {
					line = rf.readLine();
					if (line != null) {
						System.out.println(new String(line
								.getBytes("ISO-8859-1"), charset));
					} else {
						System.out.println(line);
					}
					nextend--;
				}
				nextend--;
				rf.seek(nextend);
				if (nextend == 0) {// 當檔案指標退至檔案開始處，輸出第一行
					// System.out.println(rf.readLine());
					System.out.println(new String(rf.readLine().getBytes(
							"ISO-8859-1"), charset));
				}
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (rf != null)
					rf.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	public static void main(String args[]) {
		read("mynewfile.txt", "UTF-8");
	}
}