解决方案

1、引入jar包commons-io.jar

/*** 读取文件的倒数第3行，并打印其内容*/import java.io.File;
import java.io.IOException;import org.apache.commons.io.input.ReversedLinesFileReader;public class ReversedLinesFileReaderExample {public static void main(String[] args) throws IOException {File file = new File("D:\\file1.txt");int n_lines = 3;int counter = 1;//构造方法 ReversedLinesFileReader(final File file, final int blockSize, final String encoding) ReversedLinesFileReader object = new ReversedLinesFileReader(file, 4096, "UTF-8");while (counter <= n_lines) {if (counter == n_lines) {System.out.println(object.readLine());}object.readLine();//读取下一行counter++;}}}

2、 RandomAccessFile类

 
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;public class FromEndRF {public static void read(String filename) {read(filename, "GBK");}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) {// 当文件指针退至文件开始处，输出第一行System.out.println(rf.readLine());}}} 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("d:\\2.txt", "gbk");}
}

参考文章

使用java读取文本文件的倒数第N行

JAVA如何实现从最后一行读取文件

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