打印流复制文本文件（改进版）

package cn.itcast_03;

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：Date
 * 数据源：pw2.txt --- FileReader ---BufferedReader
 * 
 * 目的地：b.txt  --- FileWriter--- BufferedWriter --PrintlnWriter
 */
public class 打印流改进复制文本文件 {
    
    

	public static void main(String[] args) throws IOException {
    
    
		//以前版本
//		//封装数据源
//		BufferedReader br = new BufferedReader (new FileReader("pw2.txt")); 
//        //封装目的地
//		BufferedWriter bw = new BufferedWriter(new FileWriter("b.txt"));
//		
//		String line = null;
//		while((line = br.readLine()) != null) {
    
    
//			bw.write(line);
//			bw.newLine();
//			bw.flush();
//		}
//    	//释放资源
//		bw.close();
//		br.close();
		
		//打印流改进
		//封装数据源
		BufferedReader br = new BufferedReader (new FileReader("pw2.txt")); 
		//封装目的地
		PrintWriter pw = new PrintWriter(new FileWriter("b.txt"),true);
		
		String line = null;
		while((line = br.readLine()) != null) {
    
    
			pw.println(line);
		}
		pw.close();
		br.close();				
	}
}