java代码I/O流类

package com.aini;

//流类rr
//流操作的步骤：
/*1.找到指定File
 2.实例化字节流、InputStream/OutputStream/Reader/Writer
 3.读/写文件
 4.关闭文件*/
import java.io.*;

public class yitop {
	public static void main(String[] args) {
		String c = null;
		BufferedReader bf = null;
		BufferedWriter bw = null;
		try {
			bf = new BufferedReader(new InputStreamReader(new FileInputStream(
					"txt.txt")));
			bw = new BufferedWriter(new OutputStreamWriter(
					new FileOutputStream("dfas.txt")));
			while ((c = bf.readLine()) != null) {
				// 将字符串写入文件
				bw.write(c);
				System.out.println(c);
			}
			bw.close();
			bf.close();

		} catch (FileNotFoundException e) {
			System.out.println("找不到指定文件");
		} catch (Exception e) {
			System.out.println("文复制错误");
		}
		System.out.println("文件已复制");
	}
}

　　

　　总结：