直接上代码：
1、服务提供端及客户端共享代码
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package
com.alibaba.dubbo.demo;
public
interface
DemoService2 {
Person getPersion(String name);
}
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package
com.alibaba.dubbo.demo;
import
java.io.Serializable;
public
class
Person
implements
Serializable {
private
static
final
long
serialVersionUID = -8994496944734041861L;
private
int
age;
private
String name;
public
int
getAge() {
return
age;
}
public
void
setAge(
int
age) {
this
.age = age;
}
public
String getName() {
return
name;
}
public
void
setName(String name) {
this
.name = name;
}
@Override
public
String toString() {
return
"Person [age="
+ age +
", name="
+ name +
"]"
;
}
}
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2、客户端代码
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import
java.util.concurrent.Future;
import
org.springframework.context.support.ClassPathXmlApplicationContext;
import
com.alibaba.dubbo.demo.DemoService2;
import
com.alibaba.dubbo.demo.Person;
import
com.alibaba.dubbo.rpc.RpcContext;
public
class
Consumer {
/**
* @param args
* @throws Exception
*/
public
static
void
main(String[] args)
throws
Exception {
ClassPathXmlApplicationContext context =
new
ClassPathXmlApplicationContext(
new
String[] {
"classpath:consumer.xml"
});
context.start();
// 异步调用示例
DemoService2 demoService2 = (DemoService2) context.getBean(
"demoService2"
);
Person p = demoService2.getPersion(
"hanshubo"
);
System.out.println(p);
Future<Person> pFuture = RpcContext.getContext().getFuture();
p = pFuture.get();
System.out.println(p);
}
}
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3、客户端配置文件
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<?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:dubbo=
"http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http:
//www.springframework.org/schema/beans
http:
//www.springframework.org/schema/beans/spring-beans.xsd
http:
//code.alibabatech.com/schema/dubbo
http:
//code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 -->
<dubbo:application name=
"consumer-of-helloworld-app"
/>
<!-- 使用zookeeper注册中心暴露发现服务地址 -->
<dubbo:registry address=
"zookeeper://127.0.0.1:2181"
/>
<!-- 生成远程服务代理 -->
<dubbo:reference id=
"demoService"
interface
=
"com.alibaba.dubbo.demo.DemoService"
retries=
"2"
/>
<!-- 生成远程服务代理 -->
<dubbo:reference id=
"validationService"
interface
=
"com.alibaba.dubbo.demo.ValidationService"
retries=
"2"
validation=
"true"
/>
<!-- 生成远程服务代理 -->
<dubbo:reference id=
"demoService2"
interface
=
"com.alibaba.dubbo.demo.DemoService2"
async=
"true"
/>
</beans>
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注：重点关注下面这行代码，就OK啦
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async=
"true"
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4、服务提供端代码
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package
com.alibaba.dubbo.demo.provider;
import
com.alibaba.dubbo.demo.DemoService2;
import
com.alibaba.dubbo.demo.Person;
public
class
DemoService2Impl
implements
DemoService2 {
@Override
public
Person getPersion(String name) {
Person r =
new
Person();
r.setAge(
123
);
r.setName(name);
return
r;
}
}
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4、服务提供端配置文件
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<?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:dubbo=
"http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http:
//www.springframework.org/schema/beans
http:
//www.springframework.org/schema/beans/spring-beans.xsd
http:
//code.alibabatech.com/schema/dubbo
http:
//code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!-- 提供方应用信息，用于计算依赖关系 -->
<dubbo:application name=
"hello-world"
/>
<!-- 使用zookeeper注册中心暴露发现服务地址 -->
<dubbo:registry address=
"zookeeper://127.0.0.1:2181"
/>
<!-- 用dubbo协议在
20880
端口暴露服务 -->
<dubbo:protocol name=
"dubbo"
port=
"20880"
/>
<!-- 声明需要暴露的服务接口 -->
<dubbo:service
interface
=
"com.alibaba.dubbo.demo.DemoService"
ref=
"demoService"
/>
<!-- 和本地bean一样实现服务 -->
<bean id=
"demoService"
class
=
"com.alibaba.dubbo.demo.provider.DemoServiceImpl"
/>
<!-- 声明需要暴露的服务接口 -->
<dubbo:service
interface
=
"com.alibaba.dubbo.demo.ValidationService"
ref=
"validationService"
/>
<!-- 和本地bean一样实现服务 -->
<bean id=
"validationService"
class
=
"com.alibaba.dubbo.demo.provider.ValidationServiceImpl"
/>
<bean id=
"cacheService"
class
=
"com.alibaba.dubbo.demo.provider.CacheServiceImpl"
/>
<dubbo:service
interface
=
"com.alibaba.dubbo.demo.CacheService"
ref=
"cacheService"
/>
<!-- 声明需要暴露的服务接口 -->
<dubbo:service
interface
=
"com.alibaba.dubbo.demo.DemoService2"
ref=
"demoService2"
/>
<!-- 和本地bean一样实现服务 -->
<bean id=
"demoService2"
class
=
"com.alibaba.dubbo.demo.provider.DemoService2Impl"
/>
</beans>
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5、也可以设置是否等待消息发出：(异步总是不等待返回)
-
sent="true" 等待消息发出，消息发送失败将抛出异常。
-
sent="false" 不等待消息发出，将消息放入IO队列，即刻返回。
-
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<dubbo:method name="findFoo"async="true"sent="true"/>
6、如果你只是想异步，完全忽略返回值，可以配置return="false"，以减少Future对象的创建和管理成本：
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<dubbo:method name=
"findFoo"
async=
"true"
return
=
"false"
/>
http://my.oschina.net/hanshubo/blog/378111
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