字符缓冲流复制文件

//封装数据
		BufferedReader br=new BufferedReader(new FileReader("a.txt"));
		BufferedWriter bw=new BufferedWriter(new FileWriter("e.txt"));
		
//		//方式1
//		int len;
//		while((len=br.read())!=-1){
//			bw.write(len);
//		}
		//方式2
		int len;
		char[] ch=new char[1024];
		while((len=br.read(ch))!=-1){
			bw.write(ch,0,len);
		}
		//释放资源
		br.close();
		bw.close();