9. Spring REST XML

现在对Spring Bean配置文件执行以下更改。

1. 定义类型的beanJaxb2RootElementHttpMessageConverter.

   
   <beans:bean id="xmlMessageConverter">
   </beans:bean>
   

2. 将上面配置的bean添加到RequestMappingHandlerAdapter property messageConverters.

   
   <beans:bean>
   <beans:property name="messageConverters">
   	<beans:list>
   		<beans:ref bean="jsonMessageConverter"/>
   		<beans:ref bean="xmlMessageConverter"/>
   	</beans:list>
   </beans:property>
   </beans:bean>
   

在以上更改之后，我们最终的Spring Bean配置文件如下所示。

servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="https://www.springframework.org/schema/mvc"
	xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
	xmlns:beans="https://www.springframework.org/schema/beans"
	xmlns:context="https://www.springframework.org/schema/context"
	xsi:schemaLocation="https://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd
		https://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
		https://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

	<!-- DispatcherServlet Context: defines this servlet"s request-processing infrastructure -->
	
	<!-- Enables the Spring MVC @Controller programming model -->
	<annotation-driven />

	<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
	<resources mapping="/resources/**" location="/resources/" />

	<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
	<beans:bean>
		<beans:property name="prefix" value="/WEB-INF/views/" />
		<beans:property name="suffix" value=".jsp" />
	</beans:bean>
	
	<!-- Configure to plugin JSON as request and response in method handler -->
	<beans:bean>
		<beans:property name="messageConverters">
			<beans:list>
				<beans:ref bean="jsonMessageConverter"/>
				<beans:ref bean="xmlMessageConverter"/>
			</beans:list>
		</beans:property>
	</beans:bean>
	
	<!-- Configure bean to convert JSON to POJO and vice versa -->
	<beans:bean id="jsonMessageConverter">
	</beans:bean>	
	
	<beans:bean id="xmlMessageConverter">
	</beans:bean>
	
	<context:component-scan base-package="com.journaldev.spring.controller" />
	
</beans:beans>

我们知道，对于一个类使用JAXB编组，我们需要用@XmlRootElement annotation. So add this to our Employee model class.

Employee.java

@XmlRootElement
public class Employee implements Serializable{

//no change in code
}

就这样，我们结束了。我们的Spring应用程序将同时支持JSON和XML。它甚至支持XML请求和JSON响应，反之亦然。下面是一些屏幕截图显示了这一点。

注意：我使用的是Postman Chrome应用程序，您可以使用任何rest客户端进行此测试。

1XML响应：确保将Accept header作为&8220；application/xml&8221；传递；。

2JSON响应：确保将Accept header作为&8220；application/json&8221；传递；。

三。带有JSON响应的XML请求：确保Accept header为“；application/json”；并且Content Type header是“；text/xml”；，如下图所示。

这是Spring Restful Web服务的全部示例，支持XML和JSON。您可以看到扩展Spring框架是多么容易，这是Spring框架流行的主要原因之一。