springRest+cross跨域支持

最近一个接口项目需要支持跨域访问，基于cross实现。于是去spring官网上找了下，发现spring版本4.2+开始支持通过@CrossOrigin注解实现跨域支持。于是把spring版本升级到4.2.6，下面记录踩过的坑。
controller只需要在原先方法上面添加@CrossOrigin注解即可

@Controller
@RequestMapping("demo")
public class DemoController {


	@CrossOrigin
	@RequestMapping("test")
	public void test(ModelMap map ){	
		map.put("say", "hello world!");
	};



}

主要的坑出现在配置文件上，原来的org.springframework.web.servlet.view.ContentNegotiatingViewResolver这个类重写了，导致原来的配置不能使用，新的配置如下

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation=" 
        http://www.springframework.org/schema/beans   
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd   
        http://www.springframework.org/schema/context   
        http://www.springframework.org/schema/context/spring-context-4.0.xsd   
        http://www.springframework.org/schema/mvc   
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd   
        ">
	<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager"/>
	<mvc:resources location="/resources/" mapping="/resources/**" />
	<context:component-scan base-package="com.chenxun.demo.*" />

	 <bean id="contentNegotiationManager"
             class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
             <!-- 开启对/blog/123.json的支持-->
    <property name="favorPathExtension" value="true" />

    <!-- 关闭 /blog/123?format=json 的支持 -->
    <property name="favorParameter" value="false" />
    <!-- 自定义约定类型参数名，默认为format -->
    <property name="parameterName" value="mediaType" />
    <!-- 忽略AcceptHeader -->
    <property name="ignoreAcceptHeader" value="true"/>
      <!-- 关闭MIME类型解析 -->
    <property name="useJaf" value="false"/>

    <property name="defaultContentType" value="application/json" />

    <property name="mediaTypes">
        <map>
            <entry key="json" value="application/json" />
            <entry key="xml" value="application/xml" />
            <entry key="html" value="text/html" />
       </map>
    </property>
</bean>

	<!-- 根据客户端的不同的请求决定不同的view进行响应, 如 /blog/1.json /blog/1.xml -->
	<bean
		class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
		<property name="order" value="1" />
		<property name="contentNegotiationManager" ref="contentNegotiationManager"></property>
		<property name="viewResolvers">
			<list>
				<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />			
			</list>
		</property>
		<property name="defaultViews">
			<list>
				<!-- for application/json -->
				<bean
					class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
					<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>
				<!-- for application/xml -->
				<bean class="org.springframework.web.servlet.view.xml.MarshallingView">
					<property name="marshaller">
						<bean class="org.springframework.oxm.xstream.XStreamMarshaller"></bean>
					</property>
				</bean>

			</list>
		</property>
	</bean>


</beans>  

到此可以通过jsonp来跨越请求了，算是个小小的坑吧，记录一下。