JavaWeb02(Servlet&页面跳转方式&表单提交方式)

<!-- 配置servlet(AAservlet) -->
      <servlet>
          <servlet-name>aa</servlet-name>
          <servlet-class>com.zking.servlet.AAservlet</servlet-class>
      </servlet>
<!--  映射servlet(AAservlet) -->
      <servlet-mapping>
          <servlet-name>aa</servlet-name>
          <url-pattern>/请求路径</url-pattern>
      </servlet-mapping>
<!-- 注意:但凡是改了web.xml文件的内容  务必记得重启服务器再运行!  -->

public class LoginServlet  extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
   {
              处理get请求
    }
    @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws
 {
        处理post请求
}
}

<!--配置servlet(HelloServlet)-->
<servlet>
          <servlet-name>bb</servlet-name>
          <servlet-class>com.zking.servlet.BBServlet</servlet-class>
          <!-- 初始化参数 -->
          <init-param>
              <param-name>sb</param-name>
              <param-value>瑶大头</param-value>
          </init-param>
</servlet>
<!--只能在对应的一个servlet中拿到值:---->
this.getInitParameter("参数名");

<context-param>
          <param-name>yy</param-name>
          <param-value>瑶瑶,大头大头</param-value>
      </context-param>
<!-- 上下文参数:可被整个应用共享 -->
this.getServletContext().getInitParameter("参数名")

@WebServlet("/请求url")
public class LoginServlet  extends HttpServlet { }
//其等同于
<!-- 配置servlet(AAservlet) -->
      <servlet>
          <servlet-name>aa</servlet-name>
          <servlet-class>com.zking.servlet.AAservlet</servlet-class>
      </servlet>
      <!--  映射servlet(AAservlet) -->
      <servlet-mapping>
          <servlet-name>aa</servlet-name>
          <url-pattern>/aa.do(/请求URL)</url-pattern>
      </servlet-mapping>