Java 创建指定文件路径下的文件夹

public static void writeObjectToFile(Object obj) {
File file = new File("D:\\temp\\test.dat");
if (!file.getParentFile().exists())
file.getParentFile().mkdirs();
FileOutputStream out;
try {
out = new FileOutputStream(file);
ObjectOutputStream objOut = new ObjectOutputStream(out);
objOut.writeObject(obj);
objOut.flush();
objOut.close();
System.out.println("write object success!");
} catch (IOException e) {
System.out.println("write object failed");
e.printStackTrace();
}
}