package test_demo.fileoper;

 import java.io.*;

 /*

 * 字符输入输出流操作，复制文件

 * 使用缓冲流扩展，逐行复制

 * */

 public class FileReadWriteOper {

     public static void main(String args[]) {

         //字符流输入流

         FileReader fr = null;

         //字符流输出流

         FileWriter fw = null;

         //缓冲输入流

         BufferedReader br = null;

         //缓冲输出流

         BufferedWriter bw = null;

         try {

             fr = new FileReader(new File("C:\\testdata\\filedir\\a.txt"));

             br = new BufferedReader(fr);   //扩容，类似加水管

             fw = new FileWriter("C:\\testdata\\filedir\\c.txt");

             bw = new BufferedWriter(fw);

             //逐行复制

             String line = br.readLine();

             while (line != null) {

                 bw.write(line);

                 bw.newLine();  //换行输出

                 line = br.readLine();

             }

             System.out.println("文件复制成功！");

         } catch (IOException e) {

             e.printStackTrace();

         } finally {

             try {

                 //关闭流，顺序与打开相反

                 bw.close();

                 br.close();

                 fw.close();

                 fr.close();

             } catch (IOException e) {

                 e.printStackTrace();

             }

         }

     }

 }