Spring2 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Spring2支持那些远程服务功能:
1. RMI服务
2. Hessian或者Burlap通过HTTP远程调用服务
3. HTTP调用器暴露服务
下面用一个例子,来看一下Spring2 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
public interface IBookService {
Book getById(String id);
}
public class Book {
public String name;
public String id;
public String author;
}
public class BookService implements IBookService {
public Book getById(String id) {
return BookStore.getById(id);
}
}
客户端源代码
public class BookQueryService {
private IBookService bookService;
public void setAccountService(IBookService bookService) {
this.bookService = bookService;
}
public Book getBookById(String id) {
return bookService.getById(id);
}
}
//客户端调用示例
public static void main(String[] args) {
ClassPathXmlApplicationContext context;
context = new ClassPathXmlApplicationContext("applicationContext.xml");
BookQueryService bookQueryService = (BookQueryService) context.getBean("bookQueryService");
Book book = bookQueryService.getBookById("1");
}
使用Spring2 发布 RMI服务示例
服务器端配置:
<bean id="bookService" class="com.xmatthew.spring.remote.BookService">
</bean>
<bean class="org.springframework.remoting.rmi.RmiServiceExporter">
<!-- does not necessarily have to be the same name as the bean to be exported -->
<property name="serviceName" value="bookService"/>
<property name="service" ref="bookService"/>
<property name="serviceInterface" value="com.xmatthew.spring.remote.IBookService"/>
<property name="registryPort" value="1800"/>
</bean>
客户端配置:
<bean class="com.xmatthew.spring.remote.client.BookQueryService">
<property name="bookService" ref="bookService"/>
</bean>
<bean id="bookService" class="org.springframework.remoting.rmi.RmiProxyFactoryBean">
<property name="serviceUrl" value="rmi://localhost:1800/bookService"/>
<property name="serviceInterface" value="com.xmatthew.spring.remote.IBookService"/>
</bean>
使用Spring2 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 http://www.caucho.com 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web.xml中
<servlet>
<servlet-name>remoting</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>remoting</servlet-name>
<url-pattern>/remoting/*</url-pattern>
</servlet-mapping>
服务器端配置:
<bean id="bookService" class="com.xmatthew.spring.remote.BookService">
</bean>
<bean name="/bookService" class="org.springframework.remoting.caucho.HessianServiceExporter">
<property name="service" ref="bookService"/>
<property name="serviceInterface" value="com.xmatthew.spring.remote.IBookService"/>
</bean>
客户端配置:
<bean class="com.xmatthew.spring.remote.client.BookQueryService">
<property name="bookService" ref="bookService"/>
</bean>
<bean id="bookService" class="org.springframework.remoting.caucho.HessianProxyFactoryBean">
<property name="serviceUrl" value="http://localhost:8080/bookService"/>
<property name="serviceInterface" value="com.xmatthew.spring.remote.IBookService"/>
</bean>
使用Spring2 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:
org.springframework.remoting.caucho.BurlapServiceExporter 发布服务
客户端使用:
org.springframework.remoting.caucho.BurlapProxyFactoryBean
使用Spring2 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:
<bean id="bookService" class="com.xmatthew.spring.remote.BookService">
</bean>
<bean name="/bookService" class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter">
<property name="service" ref="bookService"/>
<property name="serviceInterface" value="com.xmatthew.spring.remote.IBookService"/>
</bean>
客户端配置:
<bean class="com.xmatthew.spring.remote.client.BookQueryService">
<property name="bookService" ref="bookService"/>
</bean>
<bean id="bookService" class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean">
<property name="serviceUrl" value="http://localhost:8080/bookService"/>
<property name="serviceInterface" value="com.xmatthew.spring.remote.IBookService"/>
</bean>
Good Luck!
Yours Matthew!