Java中 复制文件并命名的超简洁写法

DirectoryStream<Path> directoryStream;

File in = new File("C:\\Users\\simon\\Desktop\\a"); // 资源文件夹
File out = new File("C:\\Users\\simon\\Desktop\\b"); // 目标文件夹

try {
directoryStream = Files.newDirectoryStream(in.toPath()); //returning a DirectoryStream to iterate over* all entries in the directory.
directoryStream.forEach(path -> {
if (path.getFileName().toString().endsWith(".java")) { // 判断是否为java文件
try {
Files.copy(path, out.toPath().resolve(path.getFileName().toString().replace(".java", ".txt")), StandardCopyOption.REPLACE_EXISTING); // 重命名为.txt 并且复制到out文件夹
} catch (IOException e) { // 因为在lambda表达式内，所以要包裹try catch
e.printStackTrace();
}
}
});
} catch (IOException e) {
e.printStackTrace();
}