IO例子

　　　　　String fileName = "src/learnIO/Stream.java";
        FileInputStream in = new FileInputStream(fileName);
        byte[] bbuf = new byte[1024]; 
        StringBuffer sb = new StringBuffer(in.available());

　　　　　int hasRead = 0; 
        while( (hasRead = in.read(bbuf)) > 0){  
             sb.append(new String(bbuf,0,hasRead));
        }  
        String content = sb.toString();
        content=content.replaceAll("\r\n", "<br>");
        System.out.println("12"+content);