Spring使用远程服务之Hessian

- 日理万妓 2022-08-27 11:56 194阅读 0赞

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。

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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

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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>
    	    
    	<context-param>  
    	    <param-name>contextConfigLocation</param-name>  
    	    <param-value>    
    	        classpath:/spring-hessian.xml  
    	    </param-value>  
    	</context-param> 
    	
    	
    	<servlet>  
          
        <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 />
      	
    	<context:component-scan base-package="hessian" />
    
    	
    	<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />
    	
    	
          
        <bean name="HelloServiceExporter"  
            class="org.springframework.remoting.caucho.HessianServiceExporter">  
              
            <property name="service" ref="helloService" />  
              
            <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

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参考：

《Spring实战（第3版）》

PS：代码主体来源于网络

[SouthEast]: /images/20220824/ccff07ad75d0448e8945fa129b60ec59.png
[SouthEast 1]: /images/20220824/4e1366f752ec468aa6676f3bfbb2e225.png
[SouthEast 2]: /images/20220824/ab49de15854645d6ab1149be32a3a0e2.png