Java之字符流操作-复制文件

 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();
             }
         }
     }
 }