Personagem tampão fluxo de saída utilizando um BufferedReader

construtor:

BufferedReader(Reader in) ：

BufferedReader br=new BufferedReader(new FileReader("a.txt"));
		
		//读数据
//		int len;
//		while((len=br.read())!=-1){
//			System.out.print((char)len);
//		}
		int len;
		char[] ch=new char[1024];
		while((len=br.read(ch))!=-1){
			System.out.print(new String(ch,0,len));
		}
		
		br.close();