springmvc ajax 获取json 报错 406 的解决方案

使用的spring 版本都在4.3.5

使用的jackson版本2.8.5

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使用的jackson maven 配置：

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


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


<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-parameter-names</artifactId>
<version>${jackson.version}</version>
</dependency>

servlet配置：

<mvc:annotation-driven>
<mvc:message-converters>
<bean
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper" ref="objectMapper" />
</bean>
<bean
class="org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter">
<property name="objectMapper" ref="xmlMapper" />
</bean>
<bean class="org.springframework.http.converter.StringHttpMessageConverter" />
</mvc:message-converters>
</mvc:annotation-driven>

<!-- 有时我们返回的字段存在null的情况我们需要对其进行处理,objectMapper提供了默认的几种处理方式配置如下 -->
<bean id="objectMapper"
class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
</bean>


<bean id="xmlMapper" parent="objectMapper" p:createXmlMapper="true" />

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遇到的问题

我使用ajax请求后台controller，

$.ajax({
url:'/test-app/test/info.htm',
data : {
},
type:'post',
dataType:'json',
success:function(data){
alert(data)
}

});

这个时候报错406

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解决方案：

因为我在web.xml里面配置的spring 的servlet 拦截后缀名.htm结尾的请求，这样的话新版本的jackson默认是认为要返回text/html的格式，所以报错406了，最后修改为

<!-- spring mvc servlet -->
<servlet>
<description>spring mvc servlet</description>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<description>spring mvc 配置文件</description>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.htm</url-pattern>
<url-pattern>*.json</url-pattern>
</servlet-mapping>

这样同时拦截.htm和.json结尾的请求，然后ajax改为

$.ajax({
url:'/test-app/test/info.json',
data : {
},
type:'post',
dataType:'json',
success:function(data){
alert(data)
}

});

这样就可以正常返回json数据了。