servlet中一共包括兩個包:javax.servlet和javax.servlet.http
首先來看javax.servlet
1:接口:
1.1 首先介紹兩個最常用也是最重要的接口,servletRequest和servletResponse.這兩個是孿生 兄弟,按照官方的話說,servletRequest就是把客戶端的信息封裝起來傳遞給服務器,而後服務器會把這個對象作爲一個參數傳遞給特定的 servlet的service方法 (Defines an object to provide client request information to a servlet. The servlet container creates a ServletRequest object and passes it as an argument to the servlet's service method.![]()
, 而servletResponse則是相反,把準備好的東東打包成一個servletResponse對象,並生成靜態頁面(html)傳遞給客戶端,以 供顯示 (Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponse object and passes it as an argument to the servlet's service method).
1.2 接着是servletContext,也就是傳說中的上下文(好難理解的三個字),官方定義是一個能與 servlet容器打交道的對象,每個web應用都會有一個 (There is one context per "web application" per Java Virtual Machine),相當 於說它那裏存放着整個web應用的全局變量.,另外,它是包括在接口servletConfig中的.
1.3 servletConfig,看名字就知道是servlet容器配置的對象啦 (A servlet configuration object used by a servlet container to pass information to a servlet during initialization)
首先來看javax.servlet
1:接口:
1.1 首先介紹兩個最常用也是最重要的接口,servletRequest和servletResponse.這兩個是孿生 兄弟,按照官方的話說,servletRequest就是把客戶端的信息封裝起來傳遞給服務器,而後服務器會把這個對象作爲一個參數傳遞給特定的 servlet的service方法 (Defines an object to provide client request information to a servlet. The servlet container creates a ServletRequest object and passes it as an argument to the servlet's service method.
, 而servletResponse則是相反,把準備好的東東打包成一個servletResponse對象,並生成靜態頁面(html)傳遞給客戶端,以 供顯示 (Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponse object and passes it as an argument to the servlet's service method). 1.2 接着是servletContext,也就是傳說中的上下文(好難理解的三個字),官方定義是一個能與 servlet容器打交道的對象,每個web應用都會有一個 (There is one context per "web application" per Java Virtual Machine),相當 於說它那裏存放着整個web應用的全局變量.,另外,它是包括在接口servletConfig中的.
1.3 servletConfig,看名字就知道是servlet容器配置的對象啦 (A servlet configuration object used by a servlet container to pass information to a servlet during initialization)
