jsp 和servlet基础知识

1  在tomcat服务器当中，4**表示客户端请求错误,5**表示程序错误

2.request知识参考网址:http://wenku.baidu.com/link?url=wYwTGk8XKrLzANqWFC6i0Hgg5V19_5O3OJ_d1Jrdcp28YiLomplUBQXH3SqqFHqabIQ_1qVH_7x-4obUXKEocrXRbUDy3BULPiNulWyueHa

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