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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
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
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
< 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-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 >
< 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
< 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 >
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