Java 将目录下所有文件移至/复制到另一目录

public void moveFiles(String oldPath, String newPath){
String[] filePaths = new File(oldPath).list();

if (filePaths && filePaths.size() > 0){
if (!new File(newPath).exists()){
new File(newPath).mkdirs();
}

for (int i=0; i<filePaths.size(); i++){
if (new File(oldPath + File.separator + filePaths[i]).isDirectory()){
moveFiles(oldPath + File.separator + filePaths[i], newPath + File.separator + filePaths[i]);
}else if (new File(oldPath + File.separator + filePaths[i]).isFile()){
//复制文件到另一个目录
copyFile(oldPath + file.separator + filePath[i], newPath + file.separator + filePath[i]);
//移动文件至另一个目录
new File(oldPath + File.separator + filePaths[i]).renameTo(new File(newPath + File.separator + filePaths[i]));
}
}
}
}

public void copyFile(String oldPath, String newPath) throws IOException {
File oldFile = new File(oldPath);
File file = new File(newPath);
FileInputStream in = new FileInputStream(oldFile);
FileOutputStream out = new FileOutputStream(file);;

byte[] buffer=new byte[2097152];

while((in.read(buffer)) != -1){
out.write(buffer);
}
}