package com.io.demo1;

import java.io.FileReader;

import java.io.FileWriter;

public class TestFileSTringSteam {

    public static void main(String[] args) {

        FileReader fr = null;

        FileWriter fw = null;

        int len =0;

        try {

            // 声明一个读的文件字读流

            fr = new FileReader("d:/a.txt");

            // 声明一个写的文件字符流

            fw = new FileWriter("d:/b.txt");

            char[] buffer = new char[1024];

            // 这样的算法,如果读取的值为-1，则说明已经读完也

            while ((len = fr.read(buffer)) != -1){

                fw.write(buffer,0,len);

            }

            while ((len = fr.read(buffer)) != -1){

                /**

                 *  边读边写

                 */

                fw.write(buffer,0,len);

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}