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