[转]java 从后往前读文件 - [技术]
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package test; 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"); } }
