Dubbo入门教程

2017-03-27 本文已影响7167人小愚笨

实现功能

存在2个系统,A系统和B系统,A系统调用B系统的接口获取数据.

安装zookeeper

解压zookeeper-3.4.8.tar.gz,将/conf/zoo_sample.cfg修改为zoo.cfg,修改配置文件
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2.双击启动zookeeper

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创建工程B

新建B工程Maven项目

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导入依赖

<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>io.menm91</groupId>
    <artifactId>dubbo-b</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>io.menm91</groupId>
            <artifactId>dubbo-b-api</artifactId>
            <version>1.0.0-SNAPSHOT</version>
        </dependency>
        <!-- dubbo采用spring配置方式，所以需要导入spring容器依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.4</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.3</version>
            <exclusions>
                <exclusion>
                    <!-- 排除传递spring依赖 -->
                    <artifactId>spring</artifactId>
                    <groupId>org.springframework</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        
        <!-- 导入zookeeper依赖 -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.3.3</version>
        </dependency>
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <port>8081</port>
                    <path>/</path>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

配置log4j文件

log4j.properties

log4j.rootLogger=DEBUG,A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c]-[%p] %m%n

创建B-API工程

新建B-API工程MAVEN项目
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新建User类

package io.menm91.bean;

//使用dubbo要求传输的对象必须实现序列化接口
public class User implements java.io.Serializable {

     private static final long serialVersionUID = -2668999087589887337L;

     private Long id;

     private String username;

     private String password;

     private Integer age;

     public Long getId() {
             return id;
     }

     public void setId(Long id) {
             this.id = id;
     }

     public String getUsername() {
             return username;
     }

     public void setUsername(String username) {
             this.username = username;
     }

     public String getPassword() {
             return password;
     }

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

     public Integer getAge() {
             return age;
     }

     public void setAge(Integer age) {
             this.age = age;
     }

    @Override
    public String toString() {
        return "User [username=" + username + ", age=" + age + "]";
    }

}

创建UserService（接口）提供查询服务

package io.menm91.service;

import io.menm91.bean.User;
import java.util.List;

public interface UserService {

    /**
     * 查询所有用户
     * @return
     */
    public List<User> queryAll();
}

在B工程中导入B-API的依赖

导入B-API工程的依赖
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创建UserServiceImpl实现类

package io.menm91.service.impl;

import io.menm91.bean.User;
import io.menm91.service.UserService;

import java.util.ArrayList;
import java.util.List;

public class UserServiceImpl implements UserService {

    /**
     * 这里通过模拟查询数据库返回用户信息
     */
    public List<User> queryAll() {
        List<User> list = new ArrayList<User>();
        for (int i = 0; i < 10; i++) {
                User user = new User();
                user.setAge(10 + i);
                user.setId(Long.valueOf(i + 1));
                user.setPassword("123456");
                user.setUsername("username_" + i);
                list.add(user);
        }
        return list;
    }


}

编写dubbo配置文件

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<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    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-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.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="dubbo-b-server" />

    <!-- 这里使用的注册中心是zookeeper -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"
        client="zkclient" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 将该接口暴露到dubbo中 -->
    <dubbo:service interface="io.menm91.service.UserService"
        ref="userServiceImpl" />

    <!-- 将具体的实现类加入到Spring容器中 -->
    <bean id="userServiceImpl" class="io.menm91.service.impl.UserServiceImpl" />

</beans>

编写web.xml文件

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">

    <display-name>dubbo-b</display-name>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:dubbo/dubbo-*.xml</param-value>
    </context-param>

    <!--Spring的ApplicationContext 载入 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

</web-app>

启动tomcat

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搭建A系统MAVEN项目

创建A系统maven项目
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导入依赖

<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>io.menm91</groupId>
    <artifactId>dubbo-a</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>io.menm91</groupId>
            <artifactId>dubbo-b-api</artifactId>
            <version>1.0.0-SNAPSHOT</version>
        </dependency>
        <!-- dubbo采用spring配置方式，所以需要导入spring容器依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.4</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.3</version>
            <exclusions>
                <exclusion>
                    <!-- 排除传递spring依赖 -->
                    <artifactId>spring</artifactId>
                    <groupId>org.springframework</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.3.3</version>
        </dependency>

        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
        </dependency>
        
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>
</project>

配置log4j.properties文件

log4j.properties

log4j.rootLogger=DEBUG,A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c]-[%p] %m%n

编写dubbo配置文件

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<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    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-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.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="dubbo-a-consumer" />

    <!-- 这里使用的注册中心是zookeeper -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"
        client="zkclient" />

    <!-- 从注册中心中查找服务 -->
    <dubbo:reference id="userService"
        interface="io.menm91.service.UserService" />

</beans>

编写UserServiceTest测试类
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package io.menm91.service;

import io.menm91.bean.User;

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UserServiceTest {

    private UserService userService;
    @Before
    public void setUp() throws Exception {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(
                "classpath:dubbo/dubbo-*.xml");
        userService = applicationContext.getBean(UserService.class);
    }

    @Test
    public void testQueryAll() {
        List<User> userList = userService.queryAll();
        for(User user : userList){
            System.out.println(user.toString());
        }
    }

}

查看输出结果
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源代码:https://github.com/menm91/dubbo-index.git

Dubbo入门教程

实现功能

安装zookeeper

创建工程B

创建B-API工程

在B工程中导入B-API的依赖

搭建A系统MAVEN项目

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