Java创建文件夹和文件

public class HomeWork01 {
    public static void main(String[] args) throws IOException {
        String directoryPath = "e:\mytemp";
        File file = new File(directoryPath);
        if (!file.exists()){
            //创建文件夹
            if (file.mkdirs()){
                System.out.println("创建" + directoryPath + "成功");
            } else {
                System.out.println("创建" + directoryPath + "失败");
            }
        }
        String filePath = directoryPath + "\hello.txt";
        File file2 = new File(filePath);
        if (file2.exists()){
            System.out.println("该文件已存在,不能重复创建");
        } else {
            //创建文件
            if (file2.createNewFile()){
                System.out.println("文件创建成功");
                //写入内容
                BufferedWriter writer = new BufferedWriter(new FileWriter(filePath));
                writer.write("hello,world~ 编程快乐");
                writer.close();
            } else {
                System.out.println("文件创建失败");
            }
        }
    }
}