HTTP标准的请求和响应_MySQL
我们先看HTTP标准的请求和响应,请求的所有环境在标准输入的BUFFER中,响应的当然在标准输出的BUFFER中.这是任何语言都遵循的标准.
那么JSP实现时SESSION如何做?第一次响应用程序先发送一个ID,和一个特殊状态标记位,要求浏览器再次发送请求时必须传回这个ID以便识别.那么,也就是说SESSION要工作,它就有一个ID保存在标准输入中.
但是response的sendRedirect()方法并不发送任何请求参数,只是把页面直接定向到要去的地方,相当于你第一次打开浏览器,直接输入一个地址.
而带请求参数的重定向相当于你从一个href的连结点过去,这两种情况是不同的.
sendRedirect()已经抛弃了原来的标准输入中的环境参数.
对于如何重定向,至少有十种以上方法,表面上看都能重定向,可是内在的环境各不
相同,要根据不同的用途各不同的方法.
我们只有深入了解系统底层,熟悉网路中数据包中和内存中每一个BYTE是如何来的,要到哪儿去,才能很好地把握WEB系统结构.
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