1、ServletAPI核心类与接口

　　2、Servlet类处理请求的流程

　　创建servlet类的步骤：

　　创建一个命名为 TestServlet

　　继承javax.servlet.http.HttpServlet类

　　重写doGet和doPost方法

　　配置当前Servlet类的访问路径

public class TestServlet  extends HttpServlet {

    @Override
    public void init(ServletConfig config) throws ServletException {
        System.out.println("------------init");
        super.init(config);
    }

    @Override
    public void service(ServletRequest req, ServletResponse res) 
        throws ServletException, IOException {
        System.out.println("------------Servlet接口定义的service");
        super.service(req, res);
    }

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) 
        throws ServletException, IOException {
        System.out.println("------------HttpServlet类定义的service");
        super.service(req, resp);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) 
        throws ServletException, IOException {
        System.out.println("------------doGet");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) 
        throws ServletException, IOException {
        System.out.println("------------doPost");
    }

    @Override
    public void destroy() {
        System.out.println("------------destroy");
        super.destroy();
    }
}
<servlet>
    <servlet-name>TestServlet</servlet-name>
    <servlet-class>com.qfedu.servlets.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>TestServlet</servlet-name>
    <url-pattern>/test</url-pattern>
</servlet-mapping>

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