file,path,uri互相转换
uri 转 file :File file = new File(new URI(uri.toString()));
uri 转 path: Path path = Files.get(uri);
file 转 uri: URI uri = file.toURI();
file 转 path: Path path = Paths.get(file.getPath());
path 转 uri: URI uri = path.toUri()
path 转 file: File file = new File(path.toUri());
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