<!-- FileUtils -->
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

String pathName = "F:/1.txt";
List<String> list = new ArrayList<>();
list.add("我：老板，給我漲漲工資吧！");
list.add("老板：好的~");
FileUtils.writeLines(new File(pathName), list);

List<String> list = FileUtils.readLines(new File(pathName));

URL url = new URL("https://www.baidu.com");
FileUtils.copyURLToFile(url, new File("F:/1.txt"));

//使用絕對路徑, 必須添加file://
File file1 = FileUtils.toFile(new URL("file://D:/ideawork/demo/1.txt"));
System.out.println(file1.getAbsolutePath());
//使用相對路徑
File file2 = FileUtils.toFile(App.class.getResource("/test.txt"));
System.out.println(file2.getAbsolutePath());

long size = FileUtils.sizeOf(new File("D:/ideawork/demo/1.txt"));

File srcFile = new File("D:/ideawork/demo/1.txt");
File desFile = new File(App.class.getResource("/test.txt").getPath());
FileUtils.copyFile(srcFile, desFile);

FileUtils.moveFile(new File("D:/ideawork/demo/1.txt"), new File("D:/ideawork/demo/2.txt"));

FileUtils.copyDirectory(new File("D:/ideawork/demo/test"), new File("D:/ideawork/demo/test2"), new FileFilter() {
    @Override
    public boolean accept(File file) {
        //return file.isDirectory() ? true : false; //只拷貝目錄
        return true; //拷貝所有，包括目錄和文件
    }
});