- 使用 FileInputStream 和 FileOutputStream
这是最传统的方法，使用字节流进行文件复制。这种方法简单直观，但在大数据量下可能效率较低。
示例代码：
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileCopyStream {
public static void main(String[] args) {
String sourcePath = "path/to/source/file.txt";
String destPath = "path/to/destination/file.txt";
try (FileInputStream fis = new FileInputStream(sourcePath);
FileOutputStream fos = new FileOutputStream(destPath)) {
byte[] buffer = new byte[1024];
int length;
while ((length = fis.read(buffer)) > 0) {
fos.write(buffer, 0, length);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
- 使用 BufferedInputStream 和 BufferedOutputStream 为了提高效率，可以在 FileInputStream 和 FileOutputStream 上添加缓冲区。这可以显著减少磁盘访问次数，从而提高复制速度。 示例代码：
import java.io.*;
public class FileCopyBuffered {
public static void main(String[] args) {
String sourcePath = "path/to/source/file.txt";
String destPath = "path/to/destination/file.txt";
try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream(sourcePath));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destPath))) {
byte[] buffer = new byte[1024];
int length;
while ((length = bis.read(buffer)) > 0) {
bos.write(buffer, 0, length);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
3.Files.copy()方法
示例代码：
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
public class FileCopyNIO {
public static void main(String[] args) {
Path sourcePath = Paths.get("path/to/source/file.txt");
Path destPath = Paths.get("path/to/destination/file.txt");
try {
Files.copy(sourcePath, destPath, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e) {
e.printStackTrace();
}
}
}
