请问下面几句是什么意思

[飞扬残月]

     response.setHeader("Pragma","No-cache");
        response.setHeader("Cache-Control","no-cache");
        response.setDateHeader("Expires", 0);
        String copyright = DBstep.iDBManager2000.getCopyRight();//读取许可号
        ServletOutputStream OutBinarry=response.getOutputStream();
        OutBinarry.write(copyright.getBytes());
        OutBinarry.flush();
		OutBinarry.close();

[Jay_xiaolei]

[Quote=引用楼主 sichuanzog 的回复:]
Java code
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
[/Quote]

数据不缓存

[飞扬残月]

OutBinarry.write(copyright.getBytes());
OutBinarry.flush();
OutBinarry.close();

[xyfxuqingshen]

Java code
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);

[jack_liu4Ye]

防止JSP或者Servlet中的输出被浏览器保存在缓冲区中

response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);


整个代码的意思是输出“许可号”。