Spring使用远程服务之Hessian

Hessian像RMI一样，使用二进制消息进行客户端和服务端的交互，它的二进制消息可以移植到其他非Java的语言中包括PHP、Python、C++和C#。因为Hessian是基于HTTP的，所以HessianSeriviceExporter实现为一个Spring MVC控制器。

HessianSeriviceExporter是一个SpringMVC控制器，它可以接收Hessian请求，并将这些请求翻译成对POJO的调用来，从而将POJO导出为一个Hessian服务

为了使用导出Hessian服务，我们需要执行两个额外的配置步骤：

1、在web.xml中配置Spring的DispatcherServlet，并把我们的应用部署为Web应用；

2、在Spring的配置文件中配置一个URL处理器，将Hessian服务的URL分发给对应的Hessian服务Bean。

下面我们距离说明

我的项目分层

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
	  <!-- 在此处配置刚刚写的spring-hessian.xml的位置 -->
	<context-param>
	    <param-name>contextConfigLocation</param-name>
	    <param-value>
	        classpath:/spring-hessian.xml
	    </param-value>
	</context-param> 

	<servlet>
    <!-- servlet-name保持与spring-hessian.xml中一致 -->
    <servlet-name>HelloServiceExporter</servlet-name>
    <servlet-class>org.springframework.web.context.support.HttpRequestHandlerServlet</servlet-class>
	</servlet>
	<servlet-mapping>
	    <servlet-name>HelloServiceExporter</servlet-name>
	    <url-pattern>/HelloService</url-pattern>
	</servlet-mapping>  

</web-app>

spring-hessian.xml

<?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:jee="http://www.springframework.org/schema/jee"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
	 http://www.springframework.org/schema/tx
	 http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
	 http://www.springframework.org/schema/jee
	 http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
	 http://www.springframework.org/schema/aop
	 http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
	 http://www.springframework.org/schema/context
	 http://www.springframework.org/schema/context/spring-context-3.0.xsd
	 http://activemq.apache.org/schema/core
	 http://activemq.apache.org/schema/core/activemq-core.xsd"
	default-lazy-init="true"> 

  	<context:annotation-config />
  	<!-- 组件扫描,使用annotation 自动注册bean,并检查@Required,@Autowired的属性已被注入 -->
	<context:component-scan base-package="hessian" />

	<!-- 自动装配 -->
	<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />

    <!-- Name保持与web.xml中的一致，web.xml下文中描述 -->
    <bean name="HelloServiceExporter"
        class="org.springframework.remoting.caucho.HessianServiceExporter">
        <!-- service的ref与HelloServiceImpl中@Service中配置的一致 -->
        <property name="service" ref="helloService" />
        <!-- 接口的路径 -->
        <property name="serviceInterface"
            value="hessian.HelloService" />
    </bean>
</beans>

java类

package hessian;

public interface HelloService {

	void sayHello(String name);

}

package hessian;

import org.springframework.stereotype.Service;

@Service("helloService")
public class HelloServiceImpl implements HelloService {  

    /* (non-Javadoc)
     * @see com.gsoft.geloin.service.HelloService#sayHello(java.lang.String)
     */
    @Override
    public void sayHello(String name) {
        System.out.println("Hello " + name + "!");
    }  

} 

客户端的调用

首先将Service的打成jar包加入到客户端程序中

测试代码

package hessionclient;

import hessian.HelloService;

import com.caucho.hessian.client.HessianProxyFactory;

public class ArticleManager {
	public static void main(String[] args) {
        try {
            String url = "http://localhost:8080/SpringTest/HelloService";
            HessianProxyFactory factory = new HessianProxyFactory();
            HelloService helloService = (HelloService) factory.create(
                    HelloService.class, url);
            helloService.sayHello("张三");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

客户端调用图

参考：

《Spring实战（第3版）》

PS：代码主体来源于网络

Spring使用远程服务之Hessian