Spring HttpInvoker 开发

Spring提供了利用Spring MVC将远程服务输出为http调用的功能，下面演示一个客户端查询远程服务器日期的例子:

首先，定义远程服务的接口:

package org.chy.rmi.service; import java.util.Date; public interface ISystemTimeQuery { public Date query(); }

开发远程服务接口的实现类

package org.chy.rmi.service; import java.util.Date; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class SystemTimeQuery implements ISystemTimeQuery { private static Log log = LogFactory.getLog(SystemTimeQuery.class); @Override public Date query() { log.info("remote invoker--查询系统时间"); return new Date(); } }

 

由于要使用Spring MVC，在web.xml文件中加入Spring MVC配置

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <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> <servlet> <servlet-name>remoting</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>2</load-on-startup> </servlet> <servlet-mapping> <servlet-name>remoting</servlet-name> <url-pattern>/remoting/*</url-pattern> </servlet-mapping> </web-app>

 

然后定义remoting-servlet.xml文件，将其放在WEB-INF.xml下

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"> <beans> <bean name="/SystemTimeQuery-httpinvoker" class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter"> <property name="service" ref="systemTimeQuery"/> <property name="serviceInterface" value="org.chy.rmi.service.ISystemTimeQuery"/> </bean> </beans>

这样Spring MVC就会自动把QuerySystemTime输出为http invoker 服务了.

接下来，开发客户端,使用Spring 的Http Invoker要求客户端也使用Spring,而且要求客户端机器使用的jdk与服务器使用的版本一致

首先在服务器端拷贝ISystemTimeQuery接口,放到客户端.

 

然后在客户端的spring配置文件中加入如下配置，创建远程服务的代理:

<bean id="systemTimeQueryProxy" class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean"> <property name="serviceUrl"> <value>http://localhost:8080/SpringHttpInvoker/remoting/SystemTimeQuery-httpinvoker</value> </property> <property name="serviceInterface"> <value>org.chy.rmi.service.ISystemTimeQuery</value> </property> </bean>

SpringHttpInvoker是远程服务项目根目录.

客户端也开发好了，简单测试一下:

客户端测试代码如下：

ISystemTimeQuery queryProxy = (ISystemTimeQuery) ctx.getBean("systemTimeQueryProxy"); Date systemDate = queryProxy.query(); System.out.println(systemDate);