springMvc小案例

摘要: springMvc+xml方式 是单例

1，web.xml配置-----------------------

<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>

2,当web.xml中DispatcherServlet中没有配置ini-param，则在web-inf下建一个文件：文件名必须为 DispatcherServlet-servlet.xml

就是 servlet-name的值 加上"-servlet.xml"

或者 <servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>

3.--dispatcherServlet-servlet.xml配置------------------------------------

<!-- 注册Action
class代表处理类的全路径
name表示请求路径

此配置必写
-->
<bean name="/hello.action" class="cn.gdpe.springmvc.HelloAction"></bean>

<bean id="userActionId" class="cn.gdpe.springmvc.HelloAction"></bean>

<!-- 映射器
表示将bean标签的name属性当做URL请求
可选
-->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>

<!--SimpleUrlHandlerMapping将多个请求映射到同一个Action -->
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/add.action">userActionId</prop>
<prop key="/delete.action">userActionId</prop>
<prop key="/update.action">userActionId</prop>
<prop key="/select.action">userActionId</prop>
</props>
</property>
</bean>

<!-- 适配器
表示用于寻找实现了controller接口的action类
可选
-->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>

<!-- 视图器
表示用于匹配modelAndView.setViewName("/springMvcFirst.jsp");中封装的路径
可选
-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>

<!-- 专用于jsp到jsp/html的转发控制器 -->
<bean name="/testJsp.action" class="org.springframework.web.servlet.mvc.ParameterizableViewController">
<!-- 转发到真实视图名 -->
<property name="viewName" value="/forwardTestJsp.jsp"/>
</bean>

4-controller类----------------------------------------------

public class HelloAction implements Controller {

public HelloAction(){
System.out.println("HelloAction()::"+this.hashCode());
}
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {
/*
* ModerAndView 表示封装的视图数据与路径
*/
ModelAndView modelAndView =new ModelAndView();
modelAndView.addObject("message", "第一个springmvc应用程序");

modelAndView.setViewName("/springMvcFirst.jsp");
System.out.println("handlerRequest----->");
return modelAndView;
}

}