case insensitive mapping for Spring MVC @RequestMapping annotations [duplicate]

Answer 1

One of the approaches in How can I have case insensitive URLS in Spring MVC with annotated mappings works perfectly. I just tried it with combinations of @RequestMapping at the level of controller and request methods and it has worked cleanly, I am just reproducing it here for Spring 3.1.2:

The CaseInsensitivePathMatcher:

import java.util.Map;

import org.springframework.util.AntPathMatcher;

public class CaseInsensitivePathMatcher extends AntPathMatcher {
    @Override
    protected boolean doMatch(String pattern, String path, boolean fullMatch, Map<String, String> uriTemplateVariables) {
        return super.doMatch(pattern.toLowerCase(), path.toLowerCase(), fullMatch, uriTemplateVariables);
    }
}

Registering this path matcher with Spring MVC, remove the <mvc:annotation-driven/> annotation, and replace with the following, configure appropriately:

<bean name="handlerAdapter" class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    <property name="webBindingInitializer">
        <bean class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
            <property name="conversionService" ref="conversionService"></property>
            <property name="validator">
                <bean class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
                    <property name="providerClass" value="org.hibernate.validator.HibernateValidator"></property>
                </bean>
            </property>
        </bean>
    </property>
    <property name="messageConverters">
        <list>
            <ref bean="byteArrayConverter"/>
            <ref bean="jaxbConverter"/>
            <ref bean="jsonConverter"/>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter"></bean>
            <bean class="org.springframework.http.converter.ResourceHttpMessageConverter"></bean>
            <bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter"></bean>
            <bean class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter"></bean>
        </list>
    </property>
</bean>
<bean name="byteArrayConverter" class="org.springframework.http.converter.ByteArrayHttpMessageConverter"></bean>
<bean name="jaxbConverter" class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter"></bean>
<bean name="jsonConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
<bean name="caseInsensitivePathMatcher" class="org.bk.lmt.web.spring.CaseInsensitivePathMatcher"/>
<bean name="handlerMapping" class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping">
    <property name="pathMatcher" ref="caseInsensitivePathMatcher"></property>
</bean>

Or even more easily and cleanly using @Configuration:

@Configuration
@ComponentScan(basePackages="org.bk.webtestuuid")
public class WebConfiguration extends WebMvcConfigurationSupport{

    @Bean
    public PathMatcher pathMatcher(){
        return new CaseInsensitivePathMatcher();
    }
    @Bean
    public RequestMappingHandlerMapping requestMappingHandlerMapping() {
        RequestMappingHandlerMapping handlerMapping = new RequestMappingHandlerMapping();
        handlerMapping.setOrder(0);
        handlerMapping.setInterceptors(getInterceptors());
        handlerMapping.setPathMatcher(pathMatcher());
        return handlerMapping;
    }
}

Answer 2

The following simple solution should make @RequestMapping insensitive, whether it annotates a Controller or a method. Biju's solution should work too.

Create this custom HandlerMapping :

public CaseInsensitiveAnnotationHandlerMapping extends DefaultAnnotationHandlerMapping {

    @Override
    protected Object lookupHandler(String urlPath, HttpServletRequest request)
                    throws Exception {

        return super.lookupHandler(urlPath.toLowerCase(), request);
    }

    @Override
    protected void registerHandler(String urlPath, Object handler)
                    throws BeansException, IllegalStateException {

        super.registerHandler(urlPath.toLowerCase(), handler);
    }

}

And add this in your [servlet-name]-servlet.xml :

<bean class="yourpackage.CaseInsensitiveAnnotationHandlerMapping" />

Note: if you don't want two HandlerMapping in your app, you may want to remove <mvc:annotation-driven /> (it instantiates a DefaultAnnotationHandlerMapping).