J2EE部分面试题PPT资料.pptx

J2EE部分面试题PPT资料.pptx

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J2EE部分,aaaa,1.Servlet生命周期的四个阶段是什么,实例化阶段,init方法（初始化阶段）,实例化阶段、init（初始化阶段）、service（就绪阶段）、destory（销毁阶段）,2.开发Servlet要继承自哪个类,HttpServlet,HttpServlet,3.Request和response对象属于哪个类,HttpServletRequest,HttpServletResponse,HttpServletRequest、HttpServletResponse,4.怎样设置request和response的编码和内容类型,aaaa,request.setCharacterEncoding（“UTF-8”）;@#@response.setContentType（“text/html;@#@utf-8”）;@#@,5.怎样获取前台传过来的数据,aaaa,request.getParameter（“name”）;@#@,6.怎样重定向到其他地址,aaaa,response.sendRedirect（“url”）;@#@,7.ServletConfig和ServletContext的特点,Aaaa局部的全局的getinitParamter,相同点：

@#@都能获取到初始化参数不同点：

@#@ServletConfig是获取当前Servlet的初始化参数ServletContext是获取全局的初始化参数,8.列举一个设置session值的例子,HttpSessionsession=request.getSession（）;@#@session.setAttribute（键,值）;@#@,9.获取项目根路径用什么方法,aaaa,request.getContextPath（）,10.过滤器的接口是什么,过滤器的作用,aaaa,Filter，过滤请求地址，拦截某些需要拦截的东西，比如用来做登录验证，或者发帖的内容。

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