How to implement buffered input and output streams in Java

import java.io.*; public class Demo4 { public static void main(String[] args) { /** * 缓冲字节输入流（BufferedInputStream） * 特点：提高效率 */ File file = new File("C:\\JAVA_API_1.7中文.chm"); BufferedInputStream bufferedInputStream = null;//创建缓冲字节流 FileInputStream fileInputStream = null; long stare = System.currentTimeMillis();//获得当前流开始时的毫秒值 try { fileInputStream=new FileInputStream(file); bufferedInputStream = new BufferedInputStream(fileInputStream);//将文件字节流包装成缓冲字节流 byte by[] = new byte[1024];//缓冲区字节数组（这个缓冲区与Buffered不同） while ((bufferedInputStream.read(by))!=-1){//使用缓冲字节流读取数据 } long end = System.currentTimeMillis();//获得当前流结束时的毫秒值 System.out.println("运行经历的毫秒数："+(end - stare)); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (fileInputStream!=null){ try { fileInputStream.close(); } catch (IOException e) { e.printStackTrace(); } } if (bufferedInputStream!=null){ try { bufferedInputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 缓冲字节输出流（BufferedOutputStream） * 特点：提高效率 */ File file1 = new File("C:\\Word.txt"); BufferedOutputStream bufferedOutputStream = null;//创建缓冲字节输出流 FileOutputStream fileOutputStream = null; try { fileOutputStream=new FileOutputStream(file1); bufferedOutputStream=new BufferedOutputStream(fileOutputStream);//将文件输出流包装到缓冲字节输出流 String str = "深山踏红叶，耳畔闻鹭鸣。"; byte by[] = str.getBytes(); bufferedOutputStream.write(by); //<*> 使用缓冲字节输出流时，要多进行刷新操作，避免等待，有数据时就将数据写入文件当中 <*> bufferedOutputStream.flush();//刷新（强制将缓冲区数据写入文件中，即使缓冲区没有写满） } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (fileOutputStream!=null){ try { fileOutputStream.close(); } catch (IOException e) { e.printStackTrace(); } } if (bufferedOutputStream!=null){ try { bufferedOutputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } } }

import java.io.*; public class Demo6 { public static void main(String[] args) { File file = new File("C:\\Word.txt"); /** * 文件缓冲字符输出流（BufferedWriter） */ FileWriter fileWriter = null;//创建文件字符输出流 BufferedWriter bufferedWriter = null;//创建文件缓冲字符输出流 try { fileWriter = new FileWriter(file); bufferedWriter = new BufferedWriter(fileWriter);//将文件字符输出流包装成文件缓冲字符输出流 String str1 = "神里"; String str2 = "绫华"; bufferedWriter.write(str1);//第一行数据 bufferedWriter.newLine();//创建一个新行 bufferedWriter.write(str2);//第二行数据 } catch (IOException e) { e.printStackTrace(); }finally {//<*> 注意：流的关闭顺序，先创建的后关闭。 <*> if (bufferedWriter!=null){ try { bufferedWriter.close(); } catch (IOException e) { e.printStackTrace(); } } if (fileWriter!=null){ try { fileWriter.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 文件缓冲字符输入流（BufferedReader） */ FileReader fileReader = null; BufferedReader bufferedReader = null; try { fileReader = new FileReader(file); bufferedReader = new BufferedReader(fileReader);//将文件字符输入流包装成文件缓冲字符输入流 String tmp = null;//临时变量 int i = 1;//计数器 while ((tmp = bufferedReader.readLine())!=null){//循环读取文件中的内容 System.out.println("第"+i+"行："+tmp); i++; } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (bufferedReader!=null){ try { bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } if (fileReader!=null){ try { fileReader.close(); } catch (IOException e) { e.printStackTrace(); } } } } }