字符流与字节流转换输出

BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
        
        
        // BufferedWriter buw=new BufferedWriter(new OutputStreamWriter(System.out));;//打印到控制台
        BufferedWriter buw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D:\demo.txt")));//输出到文件
        String line=null;
        
        while((line=buf.readLine())!=null)
        {
            if(line.equals("over"))
            {
                break;
            }
            buw.write(line.toUpperCase());
            buw.newLine();
            buw.flush();
            
        }