springmvc 返回json数据时日期类型格式化

在spring-mvc.xml中配置如下即可（通用配置方法）：
<mvc:annotation-driven>
		<mvc:message-converters>
			<bean id="jsonHttpMessageConverter"
				class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
				<property name="supportedMediaTypes">
					<list>
						<value>text/plain;charset=UTF-8</value>
						<value>application/json;charset=UTF-8</value>
					</list>
				</property>
				<property name="objectMapper">
					<bean class="com.fasterxml.jackson.databind.ObjectMapper">
						<property name="dateFormat">
							<bean class="java.text.SimpleDateFormat">
								<constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />
							</bean>
						</property>
					</bean>
				</property>
			</bean>
		</mvc:message-converters>
	</mvc:annotation-driven>

特殊格式化方式请参考：http://www.cnblogs.com/woshimrf/p/5189435.html