Java I/O流

Java I/O流

程序运行时间截图

程序代码

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

public class copyFileChannel {
public static void copy(File a, File temp) {
FileInputStream fi = null;
FileOutputStream fo = null;
FileChannel in = null;
FileChannel out = null;
try {
fi = new FileInputStream(a);
fo = new FileOutputStream(temp);
in = fi.getChannel();// 得到对应文件通道
out = fo.getChannel();// 得到对应文件通道
in.transferTo(0, in.size(), out);// 连接两个通道
} catch (IOException e) {
e.printStackTrace();
} finally {
try {

fi.close();
fo.close();
in.close();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

public static void main(String[] args) {
// TODO Auto-generated method stub

File a = new File("a.mp3");
File temp = new File("temp.mp3");
long start, end;
start = System.currentTimeMillis();
copy(a, temp);
end = System.currentTimeMillis();
System.out.println("复制,用时" + (end - start) + "ms");
}
}