https://blog.csdn.net/Eric_splendid/article/details/79898536
测试：1.06GB 视频文件，耗时17秒
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
//原文链接：https://blog.csdn.net/Eric_splendid/article/details/79898536
public class CopyFileUtil {
public static void main(String[] args) {
long l = System.currentTimeMillis();
boolean b = false;
try {
b = copyFile("D:\\test\\123.mp4", "D:\\test1\\123.mp4");
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(b + "------------------");
System.out.println(System.currentTimeMillis() - l);
}
// 复制文件
public static boolean copyFile(String source, String target) throws Exception {
source = source.replace("\\", "/");
target = target.replace("\\", "/");
File source_file = new File(source);
File target_file = new File(target);
FileChannel in = null;
FileChannel out = null;
if (!source_file.exists() || !source_file.isFile()) {
throw new IllegalArgumentException(source_file + "文件不存在！");
}
File parent = target_file.getParentFile();
// 创建目标文件路径文件夹
if (!parent.exists()) {
parent.mkdirs();
}
// 判断目标文件是否存在
if (target_file.exists()) {
target_file.delete();
}
// 创建目标文件
if (!target_file.exists()) {
target_file.createNewFile();
}
FileInputStream inStream = null;
FileOutputStream outStream = null;
try {
inStream = new FileInputStream(source_file);
outStream = new FileOutputStream(target_file);
in = inStream.getChannel();
out = outStream.getChannel();
in.transferTo(0, in.size(), out);
} catch (IOException e) {
e.printStackTrace();
} finally {
inStream.close();
in.close();
outStream.close();
out.close();
}
if (!target_file.exists()) {
return false;
} else if (source_file.length() != target_file.length()) {
return false;
} else {
return true;
}
}
}