在軟體開發過程中,檔案操作是常見的需求。 Java作為一種流行的程式語言,具有強大的檔案操作功能。本文將為您介紹“使用Java操作文件的10大最佳實務”,幫助您更有效率、更安全地進行文件操作。無論您是Java初學者還是有經驗的開發者,這些實踐都將讓您受益匪淺。本文由php小編子墨精心整理,希望能為您的開發工作提供一些幫助。
// 使用 Path 类操作文件 Path path = Paths.get("my-file.txt"); Files.readAllBytes(path); // 使用 nio.Path 类操作文件 java.nio.file.Path path = java.nio.file.Paths.get("my-file.txt"); java.nio.file.Files.readAllBytes(path);
try (BufferedReader reader = new BufferedReader(new FileReader("my-file.txt"))) { String line; while ((line = reader.readLine()) != null) { // Process the line } } catch (IOException e) { // Handle the exception }
// 创建一个新文件 Files.createFile(Paths.get("my-file.txt")); // 写入文件 Files.write(Paths.get("my-file.txt"), "Hello world!".getBytes()); // 读取文件 byte[] bytes = Files.readAllBytes(Paths.get("my-file.txt")); String content = new String(bytes); // 删除文件 Files.delete(Paths.get("my-file.txt"));
// 写入文件 try (BufferedWriter writer = new BufferedWriter(new FileWriter("my-file.txt"))) { writer.write("Hello world!"); } catch (IOException e) { // Handle the exception } // 读取文件 try (BufferedReader reader = new BufferedReader(new FileReader("my-file.txt"))) { String line; while ((line = reader.readLine()) != null) { // Process the line } } catch (IOException e) { // Handle the exception }
// 写入文件 try (FileChannel channel = FileChannel.open(Paths.get("my-file.txt"), StandardOpenOption.WRITE)) { MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, 1024); buffer.put("Hello world!".getBytes()); } catch (IOException e) { // Handle the exception } // 读取文件 try (FileChannel channel = FileChannel.open(Paths.get("my-file.txt"), StandardOpenOption.READ)) { MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, 1024); String content = new String(buffer); } catch (IOException e) { // Handle the exception }
// 遍历文件和目录 Files.walk(Paths.get("/home/user"), new SimpleFileVisitor<Path>() { @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { // Process the file return FileVisitResult.CONTINUE; } });
// 复制文件 Files.copy(Paths.get("src.txt"), Paths.get("dest.txt")); // 移动文件 Files.move(Paths.get("src.txt"), Paths.get("dest.txt")); // 删除文件 Files.delete(Paths.get("my-file.txt"));
// 获取文件信息 File file = new File("my-file.txt"); System.out.println(file.getName()); System.out.println(file.getPath()); System.out.println(file.length());
// 在文件中随机访问数据 try (RandomAccessFile file = new RandomAccessFile("my-file.txt", "rw")) { // Seek to a specific position in the file file.seek(100); // Read data from the file byte[] bytes = new byte[10]; file.read(bytes); } catch (IOException e) { // Handle the exception }
// 选择性地写入文件 FileFilter filter = new FileFilter() { @Override public boolean accept(File file) { return file.getName().endsWith(".txt"); } }; try (FileOutputStream output = new FileOutputStream("output.txt")) { Files.copy(Files.list(Paths.get("/home/user")).filter(filter), output); } catch (IOException e) { // Handle the exception }
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