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啥也不说了，这次直接上代码
1、客户端和服务提供端共用接口类
package com.alibaba.dubbo.demo;
public interface CacheService {
String findCache(String id);
}
2、服务提供端接口实现类
package com.alibaba.dubbo.demo.provider;
import java.util.concurrent.atomic.AtomicInteger;
import com.alibaba.dubbo.demo.CacheService;
public class CacheServiceImpl implements CacheService {
private final AtomicInteger i = new AtomicInteger();
@Override
public String findCache(String id) {
String result = "request: " + id + ", response: " + i.getAndIncrement();
System.out.println(result);
return result;
}
}
3、服务提供端配置文件
<?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" /> </beans>
4、客户端配置文件
<?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="cacheService" interface="com.alibaba.dubbo.demo.CacheService" cache="true" /> </beans>
5、客户端主类
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.alibaba.dubbo.demo.CacheService;
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();
// DemoService demoService = (DemoService)
// context.getBean("demoService");
// while (true) {
// String hello = demoService.sayHello("world");
// System.out.println(hello);
//
// Thread.sleep(100);
// }
// 参数校验示例
// ValidationService validationService = (ValidationService)
// context.getBean("validationService");
// while (true) {
// ValidationParameter parameter = new ValidationParameter();
// parameter.setAge(23);
// parameter.setEmail("han@qq.com");
//
// try {
// String result = validationService.intsert(parameter);
//
// System.out.println(result);
// } catch (RpcException e) { // 抛出的是RpcException
// ConstraintViolationException ve = (ConstraintViolationException)
// e.getCause(); // 里面嵌了一个ConstraintViolationException
// Set<ConstraintViolation<?>> violations =
// ve.getConstraintViolations(); // 可以拿到一个验证错误详细信息的集合
// System.out.println(violations);
// }
// }
CacheService cacheService = (CacheService) context.getBean("cacheService");
// 测试缓存生效，多次调用返回同样的结果。(服务器端自增长返回值)
String fix = null;
for (int i = 0; i < 5; i++) {
String result = cacheService.findCache("0");
if (fix == null || fix.equals(result)) {
System.out.println("i=" + i + " OK: " + result);
} else {
System.err.println("i=" + i + " ERROR: " + result);
}
fix = result;
Thread.sleep(500);
}
// LRU的缺省cache.size为1000，执行1001次，应有溢出
for (int n = 0; n < 1001; n++) {
String pre = null;
for (int i = 0; i < 10; i++) {
String result = cacheService.findCache(String.valueOf(n));
if (pre != null && !pre.equals(result)) {
System.err.println("n=" + n + " ERROR: " + result);
}
pre = result;
}
}
// 测试LRU有移除最开始的一个缓存项
String result = cacheService.findCache("0");
if (fix != null && !fix.equals(result)) {
System.out.println("OK: " + result);
} else {
System.err.println("ERROR: " + result);
}
}
}
6、客户端控制台，返回值
i=0 OK: request: 0, response: 0 i=1 OK: request: 0, response: 0 i=2 OK: request: 0, response: 0 i=3 OK: request: 0, response: 0 i=4 OK: request: 0, response: 0 OK: request: 0, response: 1001
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原文地址：http://my.oschina.net/hanshubo/blog/377634
