JSP内置对象
1.out对象:用于向客户端 浏览器输出数据 ![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103251007-1535353481.jpg)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103252210-947513853.jpg)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103252538-255714662.jpg)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103252773-1561557718.jpg)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103251007-1535353481.jpg)
2.request对象:封装来自客户端、浏览器的各种信息(客户端向服务器发送请求)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103251382-1717288580.jpg)
3.response对象:封装来自服务器的响应信息
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103251835-537829870.jpg)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103252210-947513853.jpg)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103252538-255714662.jpg)
4.session对象:用来保存回话信息,可以在同一用户的不同请求之间共享数据(http协议是无状态协议,而使用session对象可以记录用户之前的请求信息从而保证用户访问的连续状态)每个用户对服务器产生访问时都会产生一个新的sessionID,并且在后续访问中这个sessionID会被提交给服务器。
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170223103252773-1561557718.jpg)
5.config对象:封装了应用程序的配置信息
6.exception对象:JSP执行过程中的异常和错误信息
7.page对象:指向了当前JSP程序本身
8.application对象:代表了当前应用程序的上下文,在不同用户之间共享信息
9.pageCntext对象:提供了对JSP页面所有对象以及命名空间的访问