Spring 针对远程访问服务提供的一个remote包其的的是提供一套统一的远程服务发布功能
先来看一下Spring支持那些远程服务功能 RMI服务 Hessian或者Burlap通过HTTP远程调用服务 HTTP调用器暴露服务
下面用一个例子来看一下Spring 是怎样对这些服务进行统一的封装和管理
先看一下服务器端的源代码
publicinterfaceIBookService{
BookgetById(Stringid);
}
publicclassBook{
publicStringname;
publicStringid;
publicStringauthor;
}
publicclassBookServiceimplementsIBookService{
publicBookgetById(Stringid){
returnBookStoregetById(id);
}
}
客户端源代码
publicclassBookQueryService{
privateIBookServicebookService;
publicvoidsetAccountService(IBookServicebookService){
thisbookService=bookService;
}
publicBookgetBookById(Stringid){
returnbookServicegetById(id);
}
}
//客户端调用示例
publicstaticvoidmain(String[]args){
ClassPathXmlApplicationContextcontext;
context=newClassPathXmlApplicationContext(applicationContextxml);
BookQueryServicebookQueryService=(BookQueryService)contextgetBean(bookQueryService);
Bookbook=bookQueryServicegetBookById();
}
使用Spring 发布 RMI服务示例
服务器端配置:
<beanid=bookServiceclass=comxmatthewspringremoteBookService>
</bean>
<beanclass=orgspringframeworkremotingrmiRmiServiceExporter>
<!doesnotnecessarilyhavetobethesamenameasthebeantobeexported>
<propertyname=serviceNamevalue=bookService/>
<propertyname=serviceref=bookService/>
<propertyname=serviceInterfacevalue=comxmatthewspringremoteIBookService/>
<propertyname=registryPortvalue=/>
</bean>
客户端配置:
<beanclass=comxmatthewspringremoteclientBookQueryService>
<propertyname=bookServiceref=bookService/>
</bean>
<beanid=bookServiceclass=orgspringframeworkremotingrmiRmiProxyFactoryBean>
<propertyname=serviceUrlvalue=rmi://localhost:/bookService/>
<propertyname=serviceInterfacevalue=comxmatthewspringremoteIBookService/>
</bean>
使用Spring 发布 基于Http的Hessian服务示例
注 Hessian提供一种基于HTTP的二进制远程协议它是由Caucho创建的可以在 找到更多有关Hessian的信息
首为使用Hessian需要为其配置Spring 的 DispatcherServlet把下面的配置加入到webxml中
<servlet>
<servletname>remoting</servletname>
<servletclass>orgspringframeworkwebservletDispatcherServlet</servletclass>
<loadonstartup></loadonstartup>
</servlet>
<servletmapping>
<servletname>remoting</servletname>
<urlpattern>/remoting/*</urlpattern>
</servletmapping>
服务器端配置:
<beanid=bookServiceclass=comxmatthewspringremoteBookService>
</bean>
<beanname=/bookServiceclass=orgspringframeworkremotingcauchoHessianServiceExporter>
<propertyname=serviceref=bookService/>
<propertyname=serviceInterfacevalue=comxmatthewspringremoteIBookService/>
</bean>
客户端配置:
<beanclass=comxmatthewspringremoteclientBookQueryService>
<propertyname=bookServiceref=bookService/>
</bean>
<beanid=bookServiceclass=orgspringframeworkremotingcauchoHessianProxyFactoryBean>
<propertyname=serviceUrlvalue=//localhost:/bookService/>
<propertyname=serviceInterfacevalue=comxmatthewspringremoteIBookService/>
</bean>
使用Spring 发布 基于Http的Burlap服务示例
Burlap它是一个基于XML的Hessian替代方案它的配置方法和上述Hessian的一样只要把 Hessian 换成 Burlap 就行了
服务器端使用orgspringframeworkremotingcauchoBurlapServiceExporter 发布服务客户端使用orgspringframeworkremotingcauchoBurlapProxyFactoryBean
使用Spring 发布 基于HTTP调用器暴露服务
和使用自身序列化机制的轻量级协议Burlap和Hessian相反Spring HTTP调用器使用标准Java序列化机制来通过HTTP暴露业务
但其配置与Burlap和Hessian很相近
服务器端配置:
<beanid=bookServiceclass=comxmatthewspringremoteBookService>
</bean>
<beanname=/bookServiceclass=orgspringframeworkremoting>
<propertyname=serviceref=bookService/>
<propertyname=serviceInterfacevalue=comxmatthewspringremoteIBookService/>
</bean>
客户端配置:
<beanclass=comxmatthewspringremoteclientBookQueryService>
<propertyname=bookServiceref=bookService/>
</bean>
<beanid=bookServiceclass=orgspringframeworkremoting>
<propertyname=serviceUrlvalue=//localhost:/bookService/>
<propertyname=serviceInterfacevalue=comxmatthewspringremoteIBookService/>
</bean>
