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。

Hessian入门(与Spring集成)

说明：

1. 讲述如何配置Hessian的服务器端(与Spring集成).

2. 讲述客户端如何调用

① 使用HessianProxyFactory Hessian代理工厂直接调用

② 使用HessianProxyFactoryBean Hessian代理工厂Bean来完成接口调用.

1. 讲述如何配置Hessian的服务器端(与Spring集成).

接口定义类: com.nice.isay. Isay:

			[java] view plaincopy
			
			package com.nice.isay;  
		
			public interface Isay {  
		
			    public String sayHello(String arg1,String arg2);  
		
			}

接口具体实现类: com.nice.isay. IsayImpl

			[java] view plaincopy
			
			package com.nice.isay;  
		
			public class IsayImpl implements Isay {  
		
			    public String sayHello(String arg1, String arg2) {  
		
			        return "Hello:" + arg1 + arg2;  
		
			    }  
		
			}

配置Web.xml:

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<?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>

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			<servlet>  
		
			    <servlet-name>remote</servlet-name>  
		
			    <!-- 使用Spring的代理Servlet -->  
		
			    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
		
			    <init-param>  
		
			        <param-name>namespace</param-name>  
		
			        <param-value>classes/remote-servlet</param-value>  
		
			    </init-param>  
		
			    <load-on-startup>1</load-on-startup>  
		
			</servlet>  
		
			<servlet-mapping>  
		
			    <servlet-name>remote</servlet-name>  
		
			    <url-pattern>/remote/*</url-pattern>  
		
			</servlet-mapping>

配置remote-servlet.xml[该文件位于src目录下,即编译后存在与classes下]:

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<?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>

点击(此处)折叠或打开

<?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>

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			<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">  
		
			<beans>  
		
			    <!-- 接口的具体实现类 -->  
		
			    <bean id="impl" class="com.nice.isay.IsayImpl" />  
		
			    <!-- 使用Spring的HessianServie做代理 -->  
		
			    <bean name="/helloSpring"  
		
			    class="org.springframework.remoting.caucho.HessianServiceExporter">  
		
			        <!-- service引用具体的实现实体Bean-->  
		
			        <property name="service" ref="impl" />  
		
			        <property name="serviceInterface" value="com.nice.isay.Isay" />  
		
			    </bean>  
		
			    <!-- 可以配置多个HessianServiceExporter代理Bean -->  
		
			</beans>

注:

这个文件为什么叫remote-servlet.xml呢？

因为我们在web.xml中有配置：<servlet-name>remote</servlet-name>。

所以remote-servlet.xml的文件名必须以

<servlet-name>中配置的servlet-name作为文件名的开头，

且文件名的格式必须是[servlet-name]-servlet.xml格式，否则检测不到。

即:

<param-value>classes/remote-servlet</param-value>

所以文件名为remote-servlet.xml。

2. 讲述客户端如何调用

① 使用HessianProxyFactory Hessian代理工厂直接调用

即:

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			package com.nice.test;  
		
			import java.net.MalformedURLException;  
		
			import com.caucho.hessian.client.HessianProxyFactory;  
		
			import com.nice.isay.Isay;  
		
			public class NormalClient {  
		
			    public static void main(String[] args) throws MalformedURLException {  
		
			        //Spring Hessian代理Servelet  
		
			        String url = "http://localhost:8080/HessianSpring/remote/helloSpring";  
		
			        HessianProxyFactory factory = new HessianProxyFactory();  
		
			        Isay api = (Isay) factory.create(Isay.class, url);  
		
			        System.out.println(api.sayHello("chen", "xin"));  
		
			    }  
		
			}

输出Hello:chenxin

2. 讲述客户端如何调用

② 使用HessianProxyFactoryBean Hessian代理工厂Bean来完成接口调用.

配置客户端 remote-client.xml:

			[java] view plaincopy
			
			<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">  
		
			<beans>  
		
			    <!-- 客户端Hessian代理工厂Bean -->  
		
			    <bean id="clientSpring" class="org.springframework.remoting.caucho.HessianProxyFactoryBean">  
		
			        <!-- 请求代理Servlet路径 -->          
		
			        <property name="serviceUrl">  
		
			<value>http://localhost:8080/HessianSpring/remote/helloSpring</value>  
		
			        </property>  
		
			        <!-- 接口定义 -->  
		
			        <property name="serviceInterface">  
		
			            <value>com.nice.isay.Isay</value>  
		
			        </property>  
		
			    </bean>  
		
			</beans>

调用:

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			package com.nice.test;  
		
			import org.springframework.context.ApplicationContext;  
		
			import org.springframework.context.support.ClassPathXmlApplicationContext;  
		
			import com.nice.isay.Isay;  
		
			public class SpringClient {  
		
			    public static void main(String[] args) {  
		
			        ApplicationContext contex = new ClassPathXmlApplicationContext(  
		
			                "remote-client.xml");  
		
			        // 获得客户端的Hessian代理工厂bean  
		
			        Isay i = (Isay) contex.getBean("clientSpring");  
		
			        System.out.println(i.sayHello("chen", "xin"));  
		
			    }  
		
			}

输出Hello:chenxin

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