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();
            }
        }
    }
}