Spring MVC增强型Controller-MultiActionController 使用方法
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如果为每个请求都设计一个controller的话,随着开发的进行,工程也一定会日渐庞大。当然,Spring框架提供了避免这种情况出现的方法,那就是使你的controller继承自org.springframework.web.servlet.mvc.multiaction.MultiActionController。就像Struts里的DispatchAction一样,MultiActionController可以处理多个类似的请求。
使用这种方式,我们访问两个方法的url分别为 action=方法
使用这种方式,我们访问两个方法的url分别为 自定义的url mapp
在Struts里,要使用DispatchAction只需要在其action的定义中加入parameter="method"即可。在Spring中,MultiActionController要配合一个org.springframework.web.servlet.mvc.multiaction.MethodNameResolver的实例使用(MethodNameResolver也是一个接口),但我个人认为这并不说明Spring比struts繁琐,在使用中自会体会到它的好处。
MultiActionController的默认MethodNameResolver是org.springframework.web.servlet.mvc.multiaction.InternalPathMethodNameResolver。这个实现类是依据请求的路径来决定执行MultiActionController的那个方法的。例如路径为:getlist.htm,则执行相应controller的getlist方法。在实际开发中,不提倡使用这个MethodNameResolver。
一般情况下,MultiActionController搭配的MethodNameResolver是ParameterMethodNameResolver或PropertiesMethodNameResolver,它们都是根据请求的参数来决定使用那个方法。例如,如果定义这个请求参数为method,则路径为xxx.htm?method=getlist时,就会执行指定controller的getlist方法。
首先定义我们的Controller
其中有两个不同的业务方法courseSortByList和courseSortByName
package Action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
public class DispathActionController extends MultiActionController ...{
private String listView;
private String nameView;
public String getListView() ...{
return listView;
}
public void setListView(String listView) ...{
this.listView = listView;
}
public String getNameView() ...{
return nameView;
}
public void setNameView(String nameView) ...{
this.nameView = nameView;
}
public DispathActionController()...{
}
public ModelAndView courseSortByList(HttpServletRequest request,HttpServletResponse response)...{
return new ModelAndView(this.getListView());
}
public ModelAndView courseSortByName(HttpServletRequest request,HttpServletResponse response)...{
return new ModelAndView(this.getNameView());
}
}
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
public class DispathActionController extends MultiActionController ...{
private String listView;
private String nameView;
public String getListView() ...{
return listView;
}
public void setListView(String listView) ...{
this.listView = listView;
}
public String getNameView() ...{
return nameView;
}
public void setNameView(String nameView) ...{
this.nameView = nameView;
}
public DispathActionController()...{
}
public ModelAndView courseSortByList(HttpServletRequest request,HttpServletResponse response)...{
return new ModelAndView(this.getListView());
}
public ModelAndView courseSortByName(HttpServletRequest request,HttpServletResponse response)...{
return new ModelAndView(this.getNameView());
}
}
同时建立sortByList和sortByName两个jsp文件
我们有三种使用方式
(1)使用URL
配置文件如下:
<bean id="simpleUrlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/home.mvc">HomeController</prop>
<prop key="/register.mvc">RegisterStudentController</prop>
<prop key="/feedback.mvc">FeedbackController</prop>
<prop key="/course*.mvc">multiactionController</prop> <!---用*代表所有course开头的url path->
</props>
</property>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<!-- 使用MuitlActionController控制器及URL方式访问-->
<bean id="multiactionController" class="Action.DispathActionController">
<property name="listView"><value>dispatch/sortByList</value></property>
<property name="nameView"><value>dispatch/sortByName</value></property>
</bean>
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/home.mvc">HomeController</prop>
<prop key="/register.mvc">RegisterStudentController</prop>
<prop key="/feedback.mvc">FeedbackController</prop>
<prop key="/course*.mvc">multiactionController</prop> <!---用*代表所有course开头的url path->
</props>
</property>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<!-- 使用MuitlActionController控制器及URL方式访问-->
<bean id="multiactionController" class="Action.DispathActionController">
<property name="listView"><value>dispatch/sortByList</value></property>
<property name="nameView"><value>dispatch/sortByName</value></property>
</bean>
使用这种方式,我们访问两个方法的url分别为 方法名.mvc
http://localhost:81/SpringMVCStudy/courseSortByList.mvc
http://localhost:81/SpringMVCStudy/courseSortByName.mvc
(2)解析方法名的方式
有两种细分,第一是用一个参数(类似struts的dispathAction),第二种是直接配置url mapping
第一种方式配置文件
<bean id="simpleUrlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/home.mvc">HomeController</prop>
<prop key="/register.mvc">RegisterStudentController</prop>
<prop key="/feedback.mvc">FeedbackController</prop>
<prop key="/course.mvc">multiactionController</prop>
</props>
</property>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean id="multiactionController" class="Action.DispathActionController">
<property name="listView"><value>dispatch/sortByList</value></property>
<property name="nameView"><value>dispatch/sortByName</value></property>
<property name="methodNameResolver">
<ref bean="methodNameResolver"/>
</property>
</bean>
<bean id="methodNameResolver"
class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
<property name="paramName">
<value>action</value>
</property>
</bean>
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/home.mvc">HomeController</prop>
<prop key="/register.mvc">RegisterStudentController</prop>
<prop key="/feedback.mvc">FeedbackController</prop>
<prop key="/course.mvc">multiactionController</prop>
</props>
</property>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean id="multiactionController" class="Action.DispathActionController">
<property name="listView"><value>dispatch/sortByList</value></property>
<property name="nameView"><value>dispatch/sortByName</value></property>
<property name="methodNameResolver">
<ref bean="methodNameResolver"/>
</property>
</bean>
<bean id="methodNameResolver"
class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
<property name="paramName">
<value>action</value>
</property>
</bean>
使用这种方式,我们访问两个方法的url分别为 action=方法
http://localhost:81/SpringMVCStudy/course.mvc?action=courseSortByList
http://localhost:81/SpringMVCStudy/course.mvc?action=courseSortByName
第二种方式配置文件
<bean id="simpleUrlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/home.mvc">HomeController</prop>
<prop key="/register.mvc">RegisterStudentController</prop>
<prop key="/feedback.mvc">FeedbackController</prop>
<prop key="/course.mvc">multiactionController</prop>
</props>
</property>
<property name="defaultHandler" ref="multiactionController"/> <!---这个很重要,把multiactionController配置到
SimpleUrlHandlerMapping-,否则无法识别mapping>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<!-- 使用MuitlActionController控制器及mapping参数方式访问-->
<bean id="multiactionController" class="Action.DispathActionController">
<property name="listView"><value>dispatch/sortByList</value></property>
<property name="nameView"><value>dispatch/sortByName</value></property>
<property name="methodNameResolver">
<ref bean="methodNameResolver"/>
</property>
</bean>
<bean id="methodNameResolver" class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">
<property name="mappings">
<props>
<prop key="/courseList.mvc">courseSortByList</prop>
<prop key="/courseName.mvc">courseSortByName</prop>
</props>
</property>
</bean>
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/home.mvc">HomeController</prop>
<prop key="/register.mvc">RegisterStudentController</prop>
<prop key="/feedback.mvc">FeedbackController</prop>
<prop key="/course.mvc">multiactionController</prop>
</props>
</property>
<property name="defaultHandler" ref="multiactionController"/> <!---这个很重要,把multiactionController配置到
SimpleUrlHandlerMapping-,否则无法识别mapping>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<!-- 使用MuitlActionController控制器及mapping参数方式访问-->
<bean id="multiactionController" class="Action.DispathActionController">
<property name="listView"><value>dispatch/sortByList</value></property>
<property name="nameView"><value>dispatch/sortByName</value></property>
<property name="methodNameResolver">
<ref bean="methodNameResolver"/>
</property>
</bean>
<bean id="methodNameResolver" class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">
<property name="mappings">
<props>
<prop key="/courseList.mvc">courseSortByList</prop>
<prop key="/courseName.mvc">courseSortByName</prop>
</props>
</property>
</bean>
使用这种方式,我们访问两个方法的url分别为 自定义的url mapp
http://localhost:81/SpringMVCStudy/courseList.mvc
http://localhost:81/SpringMVCStudy/courseName.mvc
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