java EE基础知识

开发一个Servlet程序的步骤：

                                                        1）创建一个java类，继承HttpServlet类

                                                        2）重写HttpServlet类的doGet方法

                                                        3）把写好的servlet程序交给tomcat服务器运行！！！！

                                                                 3.1把编译好的servlet的class文件拷贝到tomcat的一个web应用中。（web应用                                                                                       的WEB-INF/classes目录下）                

                                                                 3.2在当前web应用的web.xml文件中配置servlet

                                                                                    <!--servlet配置-->

                                                                                    <servlet>

                                                                                             <servlet-name>HelloServlet</servlet-name>

                                                                                             <servlet-class>gz.itcast.HelloServlet</servlet-class>

                                                                                    </servlet>

                                                                                   
<!--  servlet的映射配置 -->

                                                                                   
<servlet-mapping>

                                                                                             <servlet-name>HelloServlet </servlet-name>

                                                                                              <url-pattern>/hello</url-pattern>

                                                                                    </servlet-mapping>

                                                        4）访问servlet

                                                                           http://localhost:8080/myweb/hello