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常用的字节输入流有:InputStream ,FileInputStream,BufferedInputStream
- 常用的字节输出流有:OutputStream,FileOutputStream,BufferedOutputStream
- 常见的字符输入流有:Reader,InputStreamReader,FileReader,BufferedReader
- 常见的字符输出流有:Writer,OutputStreamWriter,FileWriter,BufferedWriter
- Buffered修饰的流是缓存的流,信息从内存中操作,效率比一般流操作效率高
demo如下:
public class Iotest { public static void main(String[] args) { File file = new File("E:\iotest\wl.txt"); /* * 字节流 向文件中保存内容 */ try (OutputStream os = new FileOutputStream(file, true)) { String str = " hello world"; byte[] ss = str.getBytes("UTF-8"); os.write(ss); } catch (IOException e) { e.printStackTrace(); } /* * 字节流 BufferedInputStream 向文件中保存信息 */ try (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file, true))) { String str2 = " buffered hello world"; byte[] bytes = str2.getBytes("UTF-8"); bos.write(bytes); } catch (IOException e) { e.printStackTrace(); } /* * 字节流 从文件中读取文件信息 * */ try (InputStream inputStream = new FileInputStream(file)) { byte[] input = new byte[1024]; int len = 0; while ((len = inputStream.read(input)) != -1) { System.out.println(new String(input, 0, len)); } } catch (IOException e) { e.printStackTrace(); } /* * 字节流 BufferInputStream 从文件中读取内容 * */ try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file))) { int len = 0; byte[] bytes = new byte[1024]; while ((len = bis.read(bytes)) != -1) { System.out.println(new String(bytes, 0, len)); } } catch (IOException e) { e.printStackTrace(); } /* * 字符流 向文件中保存信息 * */ try (Writer writer = new FileWriter(file, true)) { String str2 = " 你好 中国!"; writer.write(str2); writer.flush(); } catch (IOException e) { e.printStackTrace(); } /* * 字符流 BufferWriter 向文件中保存内容 * */ try (BufferedWriter bw = new BufferedWriter(new FileWriter(file, true))) { bw.write(" Buffered 你好 中国!"); bw.flush(); } catch (IOException e) { e.printStackTrace(); } /* * 字符流 读取文件中信息 * */ try (Reader reader = new FileReader(file)) { char[] r = new char[1024]; int len = 0; while ((len = reader.read(r)) != -1) { System.out.println(new String(r, 0, len)); } } catch (IOException e) { e.printStackTrace(); } /* * 字符流 BufferReader 从文件中读取信息 * */ try (BufferedReader br = new BufferedReader(new FileReader(file))) { String line = ""; while ((line = br.readLine()) != null) { System.out.println(line); } } catch (IOException e) { e.printStackTrace(); } } }