java中怎么使用io流读写文件

在Java中，可以使用IO流来读写文件。下面是一些常见的示例：

使用FileInputStream和FileOutputStream类来读写字节流文件：

FileInputStream fis = null;FileOutputStream fos = null;try {fis = new FileInputStream("input.txt");fos = new FileOutputStream("output.txt");int ch;while ((ch = fis.read()) != -1) {fos.write(ch);}} catch (IOException e) {e.printStackTrace();} finally {try {if (fis != null) {fis.close();}if (fos != null) {fos.close();}} catch (IOException e) {e.printStackTrace();}}

使用BufferedReader和BufferedWriter类来读写文本文件：

BufferedReader reader = null;BufferedWriter writer = null;try {reader = new BufferedReader(new FileReader("input.txt"));writer = new BufferedWriter(new FileWriter("output.txt"));String line;while ((line = reader.readLine()) != null) {writer.write(line);writer.newLine();}} catch (IOException e) {e.printStackTrace();} finally {try {if (reader != null) {reader.close();}if (writer != null) {writer.close();}} catch (IOException e) {e.printStackTrace();}}

使用Scanner类来读取用户输入：

Scanner scanner = new Scanner(System.in);System.out.print("请输入姓名：");String name = scanner.nextLine();System.out.println("你的姓名是：" + name);scanner.close();

这些是一些常见的示例，你可以根据不同的需求选择合适的IO类和方法来读写文件。