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 }