JAVA移动指定文件夹内的全部文件

public static void fileMove(String from, String to) throws Exception {
try {
File dir = new File(from); 
File[] files = dir.listFiles();
if (files == null) return;
File moveDir = new File(to);
if (!moveDir.exists()) {
moveDir.mkdirs();
}
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
fileMove(files[i].getPath()
,to + "\\" + files[i].getName());
files[i].delete();
}
File moveFile =
new File(moveDir.getPath() + "\\"
+ files[i].getName());
if (moveFile.exists()) {
moveFile.delete();
}
files[i].renameTo(moveFile);
}
} catch (Exception e) {
throw e;
}
}