springmvc使用htm、html后缀时，返回json数据格式异常

springmvc版本：4.2.5

springmvc当使用htm或者html后缀，controller在返回json格式数据时，可能会报406异常。

须要引入以下包：

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.9.1</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.1</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.9.1</version>
</dependency>

springmvc配置文件：

<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager"/>

<bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
	<property name="favorPathExtension" value="false" />
</bean>