hessian 在spring中的使用 （bean 如 Dao无法注入的问题）

背景

   由于项目中使用了dubbo（消费者），而dubbo的服务提供方有严格的IP和网络环境限制，导致项目只能在生产环境上启动运行，本地都无法启动测试 。  而且更换生产环境服务器后又得重新申请调用dubbo服务所需的网络环境，时间周期较长 。因此将dubbo消费服务从项目抽离出来成单独的接口系统  。而此接口系统与原项目间采用hessian通信 。

解决问题：由于低级的配置错误，导致hessain接口实现类无法通过注解注入spring bean。 搜索发现有很多人有这个问题，应该是照搬网上配置示例导致。

引入 jar包

 <dependency>        <groupId>com.caucho</groupId>        <artifactId>hessian</artifactId>        <version>4.0.38</version>        <scope>compile</scope>    </dependency>

服务端 web.xml 配置

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">  <display-name>serve-hessian</display-name>    <context-param>    <param-name>contextConfigLocation</param-name>    <param-value>classpath*:applicationContext.xml</param-value>  </context-param>  <listener>    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>  <listener>    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>  </listener>  <listener>    <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>  </listener>    <filter>    <filter-name>encodingFilter</filter-name>    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>    <init-param>      <param-name>encoding</param-name>      <param-value>utf-8</param-value>    </init-param>  </filter>  <filter-mapping>    <filter-name>encodingFilter</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping> <servlet>        <servlet-name>hessian</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>classpath*:hessian-servlet.xml</param-value>        </init-param>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>hessian</servlet-name>        <url-pattern>/hessian/*</url-pattern>    </servlet-mapping>  <welcome-file-list>    <welcome-file>index.html</welcome-file>  </welcome-file-list> </web-app>

classpath下新建hessian-servlet.xml  ，注意这里不要定义 bean id ="" ,否则会导致hessain接口实现类中通过注解注入spring 中的bean 如 Dao时无法注入，出现null 异常

正确配置：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans                        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd                       http://www.springframework.org/schema/context                       http://www.springframework.org/schema/context/spring-context-3.2.xsd">    <bean name="/bizBusTradeOrder" class="org.springframework.remoting.caucho.HessianServiceExporter">        <property name="service" ref="isaleBusTradeOrderInboundServiceImpl" />        <property name="serviceInterface" value="com.toltech.serve.service.dubbo.IsaleBusTradeOrderInboundService" />    </bean></beans>

错误配置（不需要配置bean id="",因为此实现类直接在class中用注解配置，交由spring管理。):

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans                        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd                       http://www.springframework.org/schema/context                       http://www.springframework.org/schema/context/spring-context-3.2.xsd">  <!--不需要配置  <bean id="isaleBusTradeOrderInboundServiceImpl" class="com.toltech.serve.service.impl.dubbo.IsaleBusTradeOrderInboundServiceImpl"></bean> -->    <bean name="/bizBusTradeOrder" class="org.springframework.remoting.caucho.HessianServiceExporter">        <property name="service" ref="isaleBusTradeOrderInboundServiceImpl" />        <property name="serviceInterface" value="com.toltech.serve.service.dubbo.IsaleBusTradeOrderInboundService" />    </bean></beans>

接口实现类（通过 @Service 注解交由spring管理，通过@Resource 注入dubbo服务）

@Servicepublic class IsaleBusTradeOrderInboundServiceImpl implements IsaleBusTradeOrderInboundService{@Resourceprivate BizBusTradeOrderInboundService bizBusTradeOrderInboundService;@Resourceprivate RouteService routeService;public  InboundResponseResult<Map<String, String>> createBizBusOrder(BizBusTradeOrderDto bizbustradeorderdto){return bizBusTradeOrderInboundService.createBizBusOrder(bizbustradeorderdto);} public  InboundResponseResult<Map<String, String>> verifyItvOrder(BizBusTradeOrderDto bizbustradeorderdto){ return bizBusTradeOrderInboundService.verifyItvOrder(bizbustradeorderdto); }  public  String route(String s, String s1){ return routeService.route(s, s1); }}

dubbo 配置（消费者）

<dubbo:reference id="bizBusTradeOrderInboundService" interface="com.**.inbound.service.BizBusTradeOrderInboundService"  version="1.0"><dubbo:method name="verifyItvOrder" servicecode="33.1001.verifyItvOrder" timeout="30000"/><dubbo:method name="createBizBusOrder" servicecode="33.1001.createBizBusOrder" timeout="30000"/></dubbo:reference><dubbo:reference id="routeService" interface="com.**.RouteService"  version="1.0"><dubbo:method name="route" servicecode="33.1001.route" timeout="30000"/></dubbo:reference>

客户端调用（调用地址  http://localhost:8082/serve-hession/hessian/bizBusTradeOrder )

private IsaleBusTradeOrderInboundService bizBusTradeOrderInboundService;public IsaleBusTradeOrderInboundService getBizBusTradeOrderInboundService(){try {if(bizBusTradeOrderInboundService == null){ String url ="http://localhost:8082/serve-hession/hessian/bizBusTradeOrder"; HessianProxyFactory factory = new HessianProxyFactory();   bizBusTradeOrderInboundService = (IsaleBusTradeOrderInboundService) factory.create(   IsaleBusTradeOrderInboundService.class, url); }} catch (Exception e) {e.printStackTrace();}return bizBusTradeOrderInboundService;} public  InboundResponseResult<Map<String, String>> createBizBusOrder(BizBusTradeOrderDto bizbustradeorderdto){ if(getBizBusTradeOrderInboundService() != null){ return getBizBusTradeOrderInboundService().createBizBusOrder(bizbustradeorderdto); } return null; }    public  InboundResponseResult<Map<String, String>> verifyItvOrder(BizBusTradeOrderDto bizbustradeorderdto){    if(getBizBusTradeOrderInboundService() != null){ return getBizBusTradeOrderInboundService().verifyItvOrder(bizbustradeorderdto); } return null;    }