Spring Framework中有對RMI,Hessian,Burlap,JAX-RPC,JAX-WS.JMS的服務支持,更方便的用於開發異構的服務系統,自身也有HTTPinvoker技術提供遠端服務.
以下示例來自SpringFramework-doc文檔, 我們先建立用於測試的實體、服務接口類：public class Account implements Serializable{
private String name;
public String getName(){
return name;
}
public void setName(String name) {
this.name = name;
}
}
public interface AccountService {
public void insertAccount(Account account);
public List<Account> getAccounts(String name);
}
// 服務的具體實現類
public class AccountServiceImpl implements AccountService {
public void insertAccount(Account acc) {
// do something...
}
public List<Account> getAccounts(String name) {
// do something...
}
}
下面我們就用caucho公司的hessian技術來提供一個基於HTTP的服務：
首先需要下載hessian包:http://www.caucho.com.
然后配置web.xml
<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>
建立spring xml 配置remoting-servlet.xml通過Spring包裝一個接口為hessian服務：
<bean id="accountService" class="example.AccountServiceImpl">
<!-- any additional properties, maybe a DAO? -->
</bean>
<bean name="/AccountService" class="org.springframework.remoting.caucho.HessianServiceExporter">
<property name="service" ref="accountService"/>
<property name="serviceInterface" value="example.AccountService"/>
</bean>
這樣 hessian的服務就通過'http://HOST:8080/remoting/AccountService'.來暴露給客戶端調用
在客戶端中調用
通過Spring來配置測試BEAN
public class SimpleObject {
private AccountService accountService;
public void setAccountService(AccountService accountService) {
this.accountService = accountService;
}
// additional methods using the accountService
}
<bean class="example.SimpleObject">
<property name="accountService" ref="accountService"/>
</bean>
<bean id="accountService" class="org.springframework.remoting.caucho.HessianProxyFactoryBean">
<property name="serviceUrl" value="http://remotehost:8080/remoting/AccountService"/>
<property name="serviceInterface" value="example.AccountService"/>
</bean>
servicePort屬性被省略了（默認為0）。這意味着匿名端口將用於與服務通信。
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