dubbo是一个分布式的服务架构，可直接用于生产环境作为SOA服务框架。
官网首页：http://dubbo.io/ ，官方用户指南 http://dubbo.io/User+Guide-zh.htm上面的几张图画得不错，完全可以当做SOA架构的学习资料
淘宝将这个项目开源出来以后，得到了不少同行的支持，包括：
当当网的扩展版本dubbox ：https://github.com/dangdangdotcom/dubbox
京东的扩展版本jd-hydra: http://www.oschina.net/p/jd-hydra
不过，略有遗憾的是，据说在淘宝内部，dubbo由于跟淘宝另一个类似的框架HSF（非开源）有竞争关系，导致dubbo团队已经解散（参见http://www.oschina.net/news/55059/druid-1-0-9 中的评论），反到是当当网的扩展版本仍在持续发展，墙内开花墙外香。
不管如何，能在阿里、当当、京东这些大型网站正式使用的框架，总不至于差到哪里去。
本文下面的示例均基于当当的dubbox版本，由于dubbox并没向maven提交编译后的jar包，所以只能从github clone代码到本地编译得到jar包。
编译及测试步骤：(以下步骤全在windows环境中完成)
1. 本机先安装github on Windows的客户端，将在path路径中，把git.exe加进去
2. 命令行下 git clone https://github.com/dangdangdotcom/dubbox 把代码拉到本地
3. mvn install -Dmaven.test.skip=true 跳过测试编译
4. 在本机安装一个zookeeper，参考zoo.cfg如下：
tickTime=2000
initLimit=10
syncLimit=5
dataDir=D:/java/zookeeper-3.4.6/data
dataLogDir=D:/java/zookeeper-3.4.6/log
clientPort=2181
server.1=localhost:2287:3387
然后输入 bin/zkServer.cmd 启用zookeeper
5. intellij Idea中导入源码
6. 运行 \dubbox\dubbo-demo\dubbo-demo-provider\src\test\java\com\alibaba\dubbo\demo\provider\DemoProvider.java
把服务提供方跑起来，成功后，可以在ZK里，用 ls / 看下，会发现zk里多出了一个dubbo的节点，所有服务全注册在这里了
7. 运行\dubbox\dubbo-demo\dubbo-demo-consumer\src\test\java\com\alibaba\dubbo\demo\consumer\DemoConsumer.java
服务消费方调用测试，可以看console里的输出
8. 运行\dubbox\dubbo-demo\dubbo-demo-consumer\src\test\java\com\alibaba\dubbo\demo\consumer\RestClient.java
跑一下rest调用
9. 浏览器访问 http://localhost:8888/services/users/100.xml 或 http://localhost:8888/services/users/100.json
dubbox官方的示例，虽然已经很简单了，但是对于初次接触的人来讲，仍然略显复杂，下面的代码在其基础上简化了一下：
一、先定义服务接口及传输对象DTO
项目结构如下
代码：
User.java
package yjmyzz.dubbo.demo.api;
import org.codehaus.jackson.annotate.JsonProperty;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import java.io.Serializable; @XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class User implements Serializable { @NotNull
@Min(1L)
private Long id; @JsonProperty("username")
@XmlElement(name = "username")
@NotNull
@Size(min = 6, max = 50)
private String name; public User() {
} public User(Long id, String name) {
this.id = id;
this.name = name;
} public Long getId() {
return id;
} public void setId(Long id) {
this.id = id;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} @Override
public String toString() {
return "User (" +
"id=" + id +
", name='" + name + '\'' +
')';
}
}
UserService.java
package yjmyzz.dubbo.demo.api;
public interface UserService {
User getUser(Long id);
}
UserRestService.java
package yjmyzz.dubbo.demo.api;
import javax.validation.constraints.Min;
public interface UserRestService {
User getUser(@Min(value = 1L, message = "User ID must be greater than 1") Long id);
}
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.cnblogs.yjmyzz</groupId>
<artifactId>dubbo-hello-api</artifactId>
<version>0.1</version> <dependencies> <dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.8.4</version>
</dependency> <dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
</dependency> <dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.2</version>
</dependency> <dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.12</version>
</dependency> </dependencies>
</project>
二、定义服务生产者（即：服务接口的实现方）
UserServiceImpl.java
package yjmyzz.dubbo.demo.provider; import yjmyzz.dubbo.demo.api.User;
import yjmyzz.dubbo.demo.api.UserService; public class UserServiceImpl implements UserService { public User getUser(Long id) {
return new User(id, "username" + id);
}
}
UserRestServiceImpl.java
package yjmyzz.dubbo.demo.provider; import com.alibaba.dubbo.rpc.RpcContext;
import com.alibaba.dubbo.rpc.protocol.rest.support.ContentType;
import yjmyzz.dubbo.demo.api.User;
import yjmyzz.dubbo.demo.api.UserRestService;
import yjmyzz.dubbo.demo.api.UserService;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType; @Path("users")
@Consumes({MediaType.APPLICATION_JSON, MediaType.TEXT_XML})
@Produces({ContentType.APPLICATION_JSON_UTF_8, ContentType.TEXT_XML_UTF_8})
public class UserRestServiceImpl implements UserRestService { private UserService userService; public void setUserService(UserService userService) {
this.userService = userService;
} @GET
@Path("{id : \\d+}")
public User getUser(@PathParam("id") Long id) {
if (RpcContext.getContext().getRequest(HttpServletRequest.class) != null) {
System.out.println("Client IP address from RpcContext: " + RpcContext.getContext().getRequest(HttpServletRequest.class).getRemoteAddr());
}
if (RpcContext.getContext().getResponse(HttpServletResponse.class) != null) {
System.out.println("Response object from RpcContext: " + RpcContext.getContext().getResponse(HttpServletResponse.class));
}
return userService.getUser(id);
}
}
DemoProvider.java
package yjmyzz.dubbo.demo.provider;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException; public class DemoProvider {
public static void main(String[] args) throws IOException {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath*:META-INF/spring/*.xml");
context.start();
System.out.println("服务已经启动...");
System.in.read();
}
}
配置文件：resources\META-INF\spring\dubbo-demo-provider.xml
<?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-2.5.xsd
http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <dubbo:application name="demo-provider" owner="programmer" organization="dubbox"/> <dubbo:registry address="zookeeper://127.0.0.1:2181"/> <dubbo:protocol name="dubbo" serialization="kryo" optimizer="yjmyzz.dubbo.demo.api.SerializationOptimizerImpl"/> <!-- use tomcat server -->
<dubbo:protocol name="rest" port="8888" threads="500" contextpath="services" server="tomcat" accepts="500"
extension="com.alibaba.dubbo.rpc.protocol.rest.support.LoggingFilter"/> <dubbo:service interface="yjmyzz.dubbo.demo.api.UserService" ref="userService" protocol="dubbo" /> <dubbo:service interface="yjmyzz.dubbo.demo.api.UserRestService" ref="userRestService" protocol="rest" validation="true"/> <bean id="userService" class="yjmyzz.dubbo.demo.provider.UserServiceImpl"/> <bean id="userRestService" class="yjmyzz.dubbo.demo.provider.UserRestServiceImpl">
<property name="userService" ref="userService"/>
</bean> </beans>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.cnblogs.yjmyzz</groupId>
<artifactId>dubbo-hello-provider</artifactId>
<version>0.1</version> <dependencies> <!--公用的服务接口-->
<dependency>
<groupId>com.cnblogs.yjmyzz</groupId>
<artifactId>dubbo-hello-api</artifactId>
<version>0.1</version>
</dependency> <dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.8.4</version>
</dependency> <dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.15.0-GA</version>
</dependency> <dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-core</artifactId>
<version>1.1.7</version>
</dependency> <dependency>
<groupId>org.glassfish.grizzly</groupId>
<artifactId>grizzly-core</artifactId>
<version>2.1.4</version>
</dependency> <dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.2.1</version>
</dependency> <dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.39</version>
</dependency> <dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.1</version>
</dependency> <dependency>
<groupId>org.apache.bsf</groupId>
<artifactId>bsf-api</artifactId>
<version>3.1</version>
</dependency> <dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.6</version>
</dependency> <dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
</dependency> <dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>2.5.0</version>
</dependency> <dependency>
<groupId>com.googlecode.xmemcached</groupId>
<artifactId>xmemcached</artifactId>
<version>1.3.6</version>
</dependency> <dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-frontend-simple</artifactId>
<version>2.6.1</version>
</dependency> <dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-transports-http</artifactId>
<version>2.6.1</version>
</dependency> <dependency>
<groupId>org.apache.thrift</groupId>
<artifactId>libthrift</artifactId>
<version>0.8.0</version>
</dependency> <dependency>
<groupId>com.caucho</groupId>
<artifactId>hessian</artifactId>
<version>4.0.7</version>
</dependency> <dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency> <dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty</artifactId>
<version>6.1.26</version>
<exclusions>
<exclusion>
<groupId>org.mortbay.jetty</groupId>
<artifactId>servlet-api</artifactId>
</exclusion>
</exclusions>
</dependency> <dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.16</version>
</dependency> <dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.2</version>
</dependency> <dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.1.0</version>
</dependency> <dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
</dependency> <dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.2.0.Final</version>
</dependency> <dependency>
<groupId>javax.cache</groupId>
<artifactId>cache-api</artifactId>
<version>0.4</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-client</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-netty</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jdk-http</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson-provider</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<version>8.0.11</version>
</dependency> <dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-logging-juli</artifactId>
<version>8.0.11</version>
</dependency> <dependency>
<groupId>com.esotericsoftware.kryo</groupId>
<artifactId>kryo</artifactId>
<version>2.24.0</version>
</dependency> <dependency>
<groupId>de.javakaffee</groupId>
<artifactId>kryo-serializers</artifactId>
<version>0.26</version>
</dependency> <dependency>
<groupId>de.ruedigermoeller</groupId>
<artifactId>fst</artifactId>
<version>1.55</version>
</dependency> </dependencies> </project>
测试时，运行DemoProvider中的main方法即可启动服务，所有服务注册在ZooKeeper，层次结构类似下面这样：
/dubbo
/dubbo/yjmyzz.dubbo.demo.api.UserRestService
/dubbo/yjmyzz.dubbo.demo.api.UserRestService/providers
/dubbo/yjmyzz.dubbo.demo.api.UserRestService/configurators
/dubbo/yjmyzz.dubbo.demo.api.UserService
/dubbo/yjmyzz.dubbo.demo.api.UserService/providers
/dubbo/yjmyzz.dubbo.demo.api.UserService/configurators
三、服务消费方
DemoConsumer.java
package yjmyzz.dubbo.demo.consumer; import org.springframework.context.support.ClassPathXmlApplicationContext;
import yjmyzz.dubbo.demo.api.UserService;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Response; public class DemoConsumer { public static void main(String[] args) {
final String port = "8888"; //测试Rest服务
getUser("http://localhost:" + port + "/services/users/1.json");
getUser("http://localhost:" + port + "/services/users/1.xml"); //测试常规服务
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath*:META-INF/spring/*.xml");
context.start();
UserService userService = context.getBean(UserService.class);
System.out.println(userService.getUser(1L));
} private static void getUser(String url) {
System.out.println("Getting user via " + url);
Client client = ClientBuilder.newClient();
WebTarget target = client.target(url);
Response response = target.request().get();
try {
if (response.getStatus() != 200) {
throw new RuntimeException("Failed with HTTP error code : " + response.getStatus());
}
System.out.println("Successfully got result: " + response.readEntity(String.class));
} finally {
response.close();
client.close();
}
}
}
配置文件：resources\META-INF\spring\dubbo-hello-consumer.xml
<?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-2.5.xsd
http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <dubbo:application name="demo-consumer" owner="programmer" organization="dubbox"/> <dubbo:registry address="zookeeper://127.0.0.1:2181"/> <dubbo:reference id="userRestService" interface="yjmyzz.dubbo.demo.api.UserRestService"/> <dubbo:reference id="userService" interface="yjmyzz.dubbo.demo.api.UserService"/> </beans>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.cnblogs.yjmyzz</groupId>
<artifactId>dubbo-hello-consumer</artifactId>
<version>0.1</version> <dependencies>
<!--公用的服务接口-->
<dependency>
<groupId>com.cnblogs.yjmyzz</groupId>
<artifactId>dubbo-hello-api</artifactId>
<version>0.1</version>
</dependency> <dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.8.4</version>
</dependency> <dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.15.0-GA</version>
</dependency> <dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-core</artifactId>
<version>1.1.7</version>
</dependency> <dependency>
<groupId>org.glassfish.grizzly</groupId>
<artifactId>grizzly-core</artifactId>
<version>2.1.4</version>
</dependency> <dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.2.1</version>
</dependency> <dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.39</version>
</dependency> <dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.1</version>
</dependency> <dependency>
<groupId>org.apache.bsf</groupId>
<artifactId>bsf-api</artifactId>
<version>3.1</version>
</dependency> <dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.6</version>
</dependency> <dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
</dependency> <dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>2.5.0</version>
</dependency> <dependency>
<groupId>com.googlecode.xmemcached</groupId>
<artifactId>xmemcached</artifactId>
<version>1.3.6</version>
</dependency> <dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-frontend-simple</artifactId>
<version>2.6.1</version>
</dependency> <dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-transports-http</artifactId>
<version>2.6.1</version>
</dependency> <dependency>
<groupId>org.apache.thrift</groupId>
<artifactId>libthrift</artifactId>
<version>0.8.0</version>
</dependency> <dependency>
<groupId>com.caucho</groupId>
<artifactId>hessian</artifactId>
<version>4.0.7</version>
</dependency> <dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency> <dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty</artifactId>
<version>6.1.26</version>
<exclusions>
<exclusion>
<groupId>org.mortbay.jetty</groupId>
<artifactId>servlet-api</artifactId>
</exclusion>
</exclusions>
</dependency> <dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.16</version>
</dependency> <dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.2</version>
</dependency> <dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.1.0</version>
</dependency> <dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
</dependency> <dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.2.0.Final</version>
</dependency> <dependency>
<groupId>javax.cache</groupId>
<artifactId>cache-api</artifactId>
<version>0.4</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-client</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-netty</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jdk-http</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson-provider</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>3.0.7.Final</version>
</dependency> <dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<version>8.0.11</version>
</dependency> <dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-logging-juli</artifactId>
<version>8.0.11</version>
</dependency> <dependency>
<groupId>com.esotericsoftware.kryo</groupId>
<artifactId>kryo</artifactId>
<version>2.24.0</version>
</dependency> <dependency>
<groupId>de.javakaffee</groupId>
<artifactId>kryo-serializers</artifactId>
<version>0.26</version>
</dependency> <dependency>
<groupId>de.ruedigermoeller</groupId>
<artifactId>fst</artifactId>
<version>1.55</version>
</dependency>
</dependencies> </project>
其它注意事项：
dubbo构架中，zk充着“服务注册中心”的角色，所以生产者与消费者的xml配置文件中，都要配置zk地址，如果zk采用集群部署时，配置写法参考下面这样：
<dubbo:registry address="zookeeper://172.28.*.102:2181?backup=172.28.*.102:2182,172.28.*.102:2183"/>
dubbo还有一个管理界面，用于服务治理，包括启用/禁用服务，设置服务的路由规则（即：A地址的Consumer直接调用B机器的Provider，而不是由负载均衡算法分配）等等。
使用方法：将dubbo-admin这个项目编译成war包后，部署到jetty或其它兼容web server即可（当然要修改\WEB-INF\dubbo.properties里zk的地址）
部署完成后，访问管理界面时，默认用户名，密码均是root。
另外dubbo-monitor项目用于性能监控，结合监控产生的数据，再套上一些图表展示的框架，可以用图表方式直观展示各种指标。
注：官网给出的dubbo-admin采用的webx架构有点老，而且除了淘宝之外，几乎没人在用，dubbo-monitor-simple界面也比较古朴，所以社区也人对其做了扩展，详情参考另一篇博客dubbox 的各种管理和监管
2016-02-25：dubbox依赖的spring虽然升级成3.x了，但版本还是有点低，spring都已经4.x了，为了方便我fork了一份，升级成spring 4.x 同时增加了log4j2的日志组件支持，详情见：dubbox升级spring到4.x及添加log4j2支持
参考文章：
http://shiyanjun.cn/archives/341.html
http://blog.csdn.net/wilsonke/article/details/39896595
http://www.dataguru.cn/thread-464197-1-1.html
http://www.iteye.com/magazines/103
http://dangdangdotcom.github.io/dubbox/rest.html