使用打印流复制文件

使用打印流复制文件

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.PrintWriter;

 

/*

 * 需求：DataStreamDemo.java复制到Copy.java中

 * 数据源：

 *             DataStreamDemo.java -- 读取数据 --FileReader -- BufferedReader

 * 目的地：

 *             Copy.java -- 写出数据 --FileWriter -- BufferedWriter -- PrintWriter

 */

public class CopyFileDemo {

         publicstatic void main(String[] args) throws IOException {

                   //以前的版本

                   //封装数据源

                   //BufferedReader br = new BufferedReader(new FileReader(

                   //"DataStreamDemo.java"));

                   //// 封装目的地

                   //BufferedWriter bw = new BufferedWriter(new FileWriter("Copy.java"));

                   //

                   //String line = null;

                   //while ((line = br.readLine()) != null) {

                   //bw.write(line);

                   //bw.newLine();

                   //bw.flush();

                   //}

                   //

                   //bw.close();

                   //br.close();

 

                   //打印流的改进版

                   //封装数据源

                   BufferedReaderbr = new BufferedReader(new FileReader(

                                     "DataStreamDemo.java"));

                   //封装目的地

                   PrintWriterpw = new PrintWriter(new FileWriter("Copy.java"), true);

                  

                   Stringline = null;

                   while((line=br.readLine())!=null){

                            pw.println(line);

                   }

                  

                   pw.close();

                   br.close();

         }

}