從demo 開始學dubbo

dubbo 介紹

dubbo 是一個分佈式服務框架,致力於提供高性能和透明化的RPC遠程服務調用方案, 以及SOA服務治理方案.

其核心部分包含:

遠程通信：

提供對多種基於長連接的NIO框架抽象封裝, 包括多種線程模型,序列化, 以及”請求-響應”模式的信息交換方式.
集羣容錯:

提供基於接口方法的透明遠程過程調用, 包括多協議支持，以及軟負載均衡，失敗容錯, 地址路由, 動態配置等集羣支持。
自動發現:

基於註冊中心目錄服務,使服務消費者能動態查找服務提供方, 是地址透明,是服務提供方可以平滑增加或者減少機器。

【引自[dubbo官網介紹](http://dubbo.io/Home-zh.htm】

demo地址

地址: https://pan.baidu.com/s/1o8S0FkI#path=%252Fwww.656463.com_SOA%2520Dubbo%25E8%25A7%2586%25E9%25A2%2591%25E6%2595%2599%25E7%25A8%258B%252Fdubbo-demo

下載三個項目並導入到eclipse中:

test-service-api

IUserService 服務接口：

package jzq.lz.test_service_api;

public interface IUserService {

    UserEntity queryUserEntity();

}

UserEntity:


import java.io.Serializable;

public class UserEntity implements Serializable {

    private static final long serialVersionUID = 1L;

    private String userName;

    private Integer userId;

    private String password;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "UserEntity [userName=" + userName + ", userId=" + userId + ", password=" + password + "]";
    }


}

dubbo-demo-consumer

App :

package jzq.lz.test_service_consumer;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import jzq.lz.test_service_api.IUserService;
import jzq.lz.test_service_api.UserEntity;

/**
 * Hello world!
 *
 */
public class App 
{
    public static void main( String[] args )
    {
          ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("dubbo-consumer.xml");
          IUserService demoService = (IUserService)context.getBean("userService"); // 獲取遠程服務代理
          UserEntity user = demoService.queryUserEntity();

          System.out.println(user);

          try {
            Thread.sleep(Integer.MAX_VALUE);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

dubbo-consummer.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.xsd        
    http://code.alibabatech.com/schema/dubbo        
    http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <!-- 提供方應用信息，用於計算依賴關係 -->
    <dubbo:application name="consumer-userService"  />

    <!-- 使用multicast廣播註冊中心暴露服務地址 -->
   <!--  <dubbo:registry address="multicast://224.5.6.7:1234" /> -->

    <!-- 使用zookeeper註冊中心暴露服務地址 -->
    <dubbo:registry address="zookeeper://192.168.0.223:2181" />

    <!-- 用dubbo協議在20880端口暴露服務 -->
    <dubbo:protocol name="dubbo" port="20880" />

     <!-- 生成遠程服務代理，可以和本地bean一樣使用demoService -->
    <dubbo:reference id="userService" interface="jzq.lz.test_service_api.IUserService" />

</beans>

pom.xml:

<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>jzq.lz</groupId>
  <artifactId>test-service-consumer</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>test-service-consumer</name>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

     <distributionManagement>   
        <repository>   
            <id> releases </id>   
            <name> Nexus Release Repository </name>   
            <url> http://192.168.0.101:8081/nexus/content/repositories/releases/ </url>   
        </repository>   
        <snapshotRepository>   
            <id> snapshots </id >   
            <name> Nexus Snapshot Repository </name >   
            <url> http://192.168.0.101:8081/nexus/content/repositories/snapshots/ </url>   
        </snapshotRepository>   
    </distributionManagement> 

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>


    <dependency>
      <groupId>jzq.lz</groupId>
      <artifactId>test-service-api</artifactId>
      <version>0.0.1-SNAPSHOT</version>
    </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>3.1.4.RELEASE</version>
        </dependency>

       <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.20.0-GA</version>
       </dependency>


        <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>dubbo</artifactId>
            <version>2.5.3</version>

            <exclusions>
                <exclusion>
                    <artifactId>spring</artifactId>
                    <groupId>org.springframework</groupId>
                </exclusion>
            </exclusions> 
        </dependency>

        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.6</version>
            <exclusions>
                <exclusion>
                    <groupId>com.sun.jmx</groupId>
                    <artifactId>jmxri</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jdmk</groupId>
                    <artifactId>jmxtools</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.jms</groupId>
                    <artifactId>jms</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
        </dependency>
        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
            <version>1.6</version>
        </dependency>

    </dependencies>

</project>

dubbo-demo-provider
Main:

package jzq.lz.test.service.provider;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Hello world!
 *
 */
public class Main 
{
    public static void main( String[] args )
    {

        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("dubbo-provider.xml");

        try {
            Thread.sleep(Integer.MAX_VALUE);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
}

UserServiceIml服務是實現:

package jzq.lz.test.service.provider;

import jzq.lz.test_service_api.IUserService;
import jzq.lz.test_service_api.UserEntity;

public class UserServiceIml implements IUserService {

    @Override
    public UserEntity queryUserEntity() {

        UserEntity userEntity = new UserEntity();

        userEntity.setPassword("123456");
        userEntity.setUserId(123);
        userEntity.setUserName("18320928860");
        return userEntity;
    }



}

dubbo-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.xsd        
    http://code.alibabatech.com/schema/dubbo        
    http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <!-- 提供方應用信息，用於計算依賴關係 -->
    <dubbo:application name="hello-world-app"  />

    <!-- 使用multicast廣播註冊中心暴露服務地址 -->
   <!--  <dubbo:registry address="multicast://224.5.6.7:1234" /> -->

    <!-- 使用zookeeper註冊中心暴露服務地址 -->
    <dubbo:registry address="zookeeper://192.168.0.223:2181" />

    <!-- 用dubbo協議在20880端口暴露服務 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 聲明需要暴露的服務接口 -->
    <dubbo:service interface="jzq.lz.test_service_api.IUserService" ref="userService" />

    <!-- 和本地bean一樣實現服務 -->
    <bean id="userService" class="jzq.lz.test.service.provider.UserServiceIml" />
</beans>

運行結果

log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
UserEntity [userName=18320928860, userId=123, password=123456]

xml報錯提示

cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'dubbo:application'.

可參考 esclipse 添加xsd 校驗

從demo開始學dubbo

從demo 開始學dubbo

dubbo 介紹

demo地址

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