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The BeanNameUrlHandlerMapping has another problem when your application begins to integrate interceptors. Because there is no explicit binding between this handler mapping and the beans it is mapping, it is impossible to create complex relationships between controllers and interceptors. We will cover interceptors in detail in 6. If more complex handler mapping requirements arise, you may use the SimpleUrlHandlerMapping along with BeanNameUrlHandlerMapping. SimpleUrlHandlerMapping Created as an alternative to the simple BeanNameUrlHandlerMapping, the SimpleUrlHandlerMapping addresses the former s two shortcomings. It is able to map to prototype request handlers, and it allows you to create complex mappings between handlers and interceptors.
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The path matching algorithms default to the same mechanism as BeanNameUrlHandlerMapping, so the patterns used to map URLs to request handlers remains the same. To use a SimpleUrlHandlerMapping, simply declare it inside your ApplicationContext. The DispatcherServlet will recognize it by type, and it will not create an instance of BeanNameUrlHandlerMapping. This means that if you wish to use both mapping strategies, you must declare both in your ApplicationContext.
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The DispatcherServlet will chain handler mapping strategies, allowing you to mix and match as Tip
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you see fit. Handler mappings also implement the Ordered interface.
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To begin, we will port the previous mapping to use a SimpleUrlHandlerMapping, as shown in Listing 5-13. Listing 5-13. SimpleUrlHandlerMapping Example <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="urlMap"> <map> <entry key="/home" value-ref="homeController" /> </map> </property> </bean> <bean id="homeController" class="com.apress.expertspringmvc.flight.web.HomeController"> <property name="flightService" ref="flightService" /> </bean> Unfortunately, it is a bit more verbose when mapping two different URL patterns to the same request handler. You must create two different mappings, as shown in Listing 5-14. Listing 5-14. Two Mappings for One Controller with SimpleUrlHandlerMapping <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="urlMap"> <map> <entry key="/home*" value-ref="homeController" /> <entry key="/index" value-ref="homeController" /> </map> </property> </bean>
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As you can see, we are mapping a URL directly to a request handler instance (in this case, the singleton homeController). If your request handlers are prototypes, you may instead use the mappings property of SimpleUrlHandlerMapping. Using this property, the mapping is between a URL and a bean name (as a String), thus decoupling the mapping from the actual bean instance. Using the mappings property, you are able to map to prototype request handlers, as they are looked up every time a request enters the system. See Listing 5-15. Listing 5-15. Mapping URLs to Bean Names for Use with Prototype Handlers <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/home">homeController</prop> </props> </property> </bean> The SimpleUrlHandlerMapping maps default handlers in the same way as the BeanNameUrlHandlerMapping. To set a request handler as the default handler, simply map it to the path /*. One of the main reasons to use SimpleUrlHandlerMapping is to take advantage of interceptors. While you can configure interceptors with BeanNameUrlHandlerMapping, it is very difficult to create different combinations of handlers and interceptors. Using SimpleUrlHandlerMapping makes it easy to create custom handler chains per request handler. We will visit interceptors in 6. Custom Mapping Strategy The power and flexibility of Spring MVC s request mapping really shines when a non URL-based mapping strategy is required. Because the HandlerMapping interface doesn t require a URL to be involved in the mapping, the possibilities are quite open. To illustrate a mapping strategy not based on URLs, let s consider mapping requests to handlers based solely on request parameters. To begin with, we will subclass AbstractHandlerMapping to take advantage of ordering, the ability to set a default handler, and other life cycle callbacks. The new RequestParameterHandlerMapping class (Listing 5-16) will map request parameter values from a specified parameter name to handler instances. Listing 5-16. RequestParameterHandlerMapping public class RequestParameterHandlerMapping extends AbstractHandlerMapping implements InitializingBean { public final static String DEFAULT_PARAM_NAME = "handler"; private String parameterName = DEFAULT_PARAM_NAME; private final Map<String, Object> paramMappings = new HashMap<String, Object>();
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public final void setParamMappings(Map<String, Object> paramMappings) { this.paramMappings.putAll(paramMappings); } public final void setParameterName(String parameterName) { this.parameterName = parameterName; } @Override protected Object getHandlerInternal(HttpServletRequest request) throws Exception { String parameterValue = request.getParameter(parameterName); return paramMappings.get(parameterValue); } public void afterPropertiesSet() throws Exception { Assert.hasText(parameterName, "parameterName must not be null or blank"); } } Because this class extends AbstractHandlerMapping, if no handler exists for the request parameter, then the AbstractHandlerMapping will attempt to load the default handler, which can be set via the XML bean definition. See Listing 5-17. Listing 5-17. RequestParameterHandlerMapping XML Definition <bean class="com.apress.expertspringmvc.chap5.RequestParameterHandlerMapping"> <property name="defaultHandler" ref="defaultController" /> <property name="parameterName" value="action" /> <property name="paramMappings"> <map> <entry key="load" value-ref="loadController" /> <entry key="save" value-ref="saveController" /> </map> </property> </bean> With this configuration, the URL http://example.org/springapp/app action=load would be routed to the loadController. Remember that /app is just the DispatcherServlet mapping and not specific to any controller or request handler.
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