out.flush();
out是PrintWriter的实例
public void flush()
Flush the stream.
response.flushBuffer()；
response是HttpServletResponse的实例
public void flushBuffer()
throws java.io.IOException
Forces any content in the buffer to be written to the client. A call to this method automatically commits the response, meaning the status code and headers will be written.
_网上获取
在jsp里调用out.flush()和response.flushBuffer()有什么区别
原文：http://www.cnblogs.com/Stir-friedEggplant/p/7765567.html