Question

java中IO怎么将一个文件复制到另外一个文件夹

Answer 1

package tv.bilibili;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.FileOutputStream;

public class IoPlay {
public static void main(String[] args) throws IOException{
File f = new File("E:\\新建文本文档.txt");
File f1 = new File("D:\\");
IoPlay io = new IoPlay();
io.copy(f,f1);
}

public void copy(File f,File f1) throws IOException{ //复制文件的方法！
if(!f1.exists()){
f1.mkdir();
}
if(!f1.exists()){//路径判断，是路径还是单个的文件
File[] cf = f.listFiles();
for(File fn : cf){
if(fn.isFile()){
FileInputStream fis = new FileInputStream(fn);
FileOutputStream fos = new FileOutputStream(f1 + "\\" +fn.getName());
byte[] b = new byte[1024];
int i = fis.read(b);
while(i != -1){
fos.write(b, 0, i);
i = fis.read(b);
}
fis.close();
fos.close();
}else{
File fb = new File(f1 + "\\" + fn.getName());
fb.mkdir();
if(fn.listFiles() != null){//如果有子目录递归复制子目录！
copy(fn,fb);
}
}
}
}else{
FileInputStream fis = new FileInputStream(f);
FileOutputStream fos = new FileOutputStream(f1 + "\\" +f.getName());
byte[] b = new byte[1024];
int i = fis.read(b);
while(i != -1){
fos.write(b, 0, i);
i = fis.read(b);
}
fis.close();
fos.close();
}
}
}

以上是我自己写的，讲一个文件复制到例外一个地方，无论是文件，还是文件夹都可以

Answer 2

用filechannel吧