springmvc4.3.1配置annotation-driven后@RequestParam失效

Question

现在使用springmvc4.3.1，要返回json，所以配置annotation-driven和引用json包后就正常使用了
但原来能用的@RequestParam就失效了，而@PathVariable能用，这是为什么呢？
下面是我的配置信息
spring-conf.xml




mvc:annotation-driven
mvc:message-converters




application/json;charset=UTF-8
text/html;charset=UTF-8
application/xml;charset=UTF-8



/mvc:message-converters
/mvc:annotation-driven

<bean id="freemarkerConfiguration"
    class="org.springframework.beans.factory.config.PropertiesFactoryBean">
    <property name="location" value="classpath:freemarker.properties" />
</bean>

<!-- 配置freeMarker模板加载地址 -->
<bean id="freemarkerConfig"
    class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
    <!-- 视图解析器会在/WEB-INF/ftl/路径下扫描视图文件 -->
    <property name="templateLoaderPaths">
        <list>
            <value>/WEB-INF/ftl/json/</value>
            <value>/WEB-INF/ftl/html/</value>
        </list>
    </property>
    <property name="freemarkerVariables">
        <map>
            <entry key="xml_escape" value-ref="fmXmlEscape" />
        </map>
    </property>
</bean>

<bean id="fmXmlEscape" class="freemarker.template.utility.XmlEscape" />

<!-- FreeMarker视图解析 如返回userinfo。。在这里配置后缀名ftl和视图解析器。。 -->
<bean id="freemakerViewResolver"
    class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
    <property name="viewClass"
            value="org.springframework.web.servlet.view.freemarker.FreeMarkerView" />
    <!-- 扫描路径內所有以ftl結尾的文件 -->
    <property name="viewNames">
        <array>
            <value>*.ftl</value>
        </array>
    </property> 
    <property name="contentType" value="text/html;charset=UTF-8" />
    <property name="exposeRequestAttributes" value="true" />
    <property name="exposeSessionAttributes" value="true" />
    <property name="exposeSpringMacroHelpers" value="true" />
    <property name="requestContextAttribute" value="request" />
    <property name="cache" value="true" />
    <property name="order" value="0" />
</bean>

pom.xml
<dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>${com.fasterxml.jackson.core-version}</version>
    </dependency>

Answer 1

http://www.cnblogs.com/yangzhilong/p/3725849.html