Servlet接口

Servlet

void	destroy()           Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.
ServletConfig	getServletConfig()           Returns a ServletConfig object, which contains initialization and startup parameters for this servlet.
java.lang.String	getServletInfo()           Returns information about the servlet, such as author, version, and copyright.
void	init(ServletConfig config)           Called by the servlet container to indicate to a servlet that the servlet is being placed into service.
void	service(ServletRequest req, ServletResponse res)           Called by the servlet container to allow the servlet to respond to a request.

 

GenericServlet类

init()
          A convenience method which can be overridden so that there's no need to call super.init(config).

 

HttpServlet类

 

Provides an abstract class to be subclassed to create an HTTP servlet suitable for a Web site. A subclass of HttpServlet must override at least one method, usually one of these:

• doGet, if the servlet supports HTTP GET requests
• doPost, for HTTP POST requests
• doPut, for HTTP PUT requests
• doDelete, for HTTP DELETE requests
• init and destroy, to manage resources that are held for the life of the servlet
• getServletInfo, which the servlet uses to provide information about itself

 

 

 

ServletRequest接口的部分方法

方法名	描述
getAttribute	根据参数给定的属性名返回属性值。
getContentType	返回客户请求数据的MIME类型
getInputStream	返回以二进制数方式直接读取客户请求数据的输入流
getParameter	根据给定的参数名返回参数值
getRemoteAddr	返回远程客户主机的IP地址
getRemoteHost	返回远程客户主机名
getRemotePort	返回远程客房主机端口
setAttribute	在ServletRequest中设置属性（包括属性名和属性值）

 

 

ServletResponse接口的部分方法

 

 

 

 

方法名	描述
getOutputStream	返回可以向客户端发送二进制数据的输出流对象ServletOutputStream
getWriter	返回可以向客户端发送字符数据的PrintWriter对象
getCharacterEncoding	返回Servlet发送的响应数据的字符编码
getContentType	返回Servlet发送的响应数据的MIME类型
setCharacterEncoding	设置Servlet发送的响应数据的字符编码
setContentType	设置Servlet发送的响应数据的MIME类型