Java之字符流操作-复制文件

 1 package test_demo.fileoper;
 2 
 3 import java.io.*;
 4 
 5 /*
 6 * 字符输入输出流操作，复制文件
 7 * 使用缓冲流扩展，逐行复制
 8 * */
 9 public class FileReadWriteOper {
10     public static void main(String args[]) {
11         //字符流输入流
12         FileReader fr = null;
13         //字符流输出流
14         FileWriter fw = null;
15         //缓冲输入流
16         BufferedReader br = null;
17         //缓冲输出流
18         BufferedWriter bw = null;
19 
20         try {
21             fr = new FileReader(new File("C:\\testdata\\filedir\\a.txt"));
22             br = new BufferedReader(fr);   //扩容，类似加水管
23             fw = new FileWriter("C:\\testdata\\filedir\\c.txt");
24             bw = new BufferedWriter(fw);
25             //逐行复制
26             String line = br.readLine();
27             while (line != null) {
28                 bw.write(line);
29                 bw.newLine();  //换行输出
30                 line = br.readLine();
31             }
32             System.out.println("文件复制成功！");
33         } catch (IOException e) {
34             e.printStackTrace();
35         } finally {
36             try {
37                 //关闭流，顺序与打开相反
38                 bw.close();
39                 br.close();
40                 fw.close();
41                 fr.close();
42             } catch (IOException e) {
43                 e.printStackTrace();
44             }
45         }
46     }
47 }