Dubbo相关

时间：2019-11-09 11:34:33 阅读：96 评论：0 收藏：0 [点我收藏+]

标签：ext service pid 地址 webapps listener 需要 public hot

1.Apache Dubbo是一款高性能的ava RPC 框架

特性

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架构原理

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调用关系

1. 服务容器负责启动，加载，运行服务提供者。

2. 服务提供者在启动时，向注册中心注册自己提供的服务。

3. 服务消费者在启动时，向注册中心订阅自己所需的服务。

4. 注册中心返回服务提供者地址列表给消费者，如果有变更，注册中心将基于长连接推送变更数据给消费者。

5. 服务消费者，从提供者地址列表中，基于软负载均衡算法，选一台提供者进行调用，如果调用失败，再选另一台调用。

6. 服务消费者和提供者，在内存中累计调用次数和调用时间，定时每分钟发送一次统计数据到监控中心。

快速入门

实现功能

存在两个系统，a系统和b系统，a调用b系统的接口获取数据，用于查询用户列表

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安装zookeeper centos windows

解压到

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https://pan.baidu.com/s/1JYY_Lx5PTnaz9rTr02K4gQ

修改配置文件zoo.cfg 该目录必须存在

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启动zookeeper服务

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搭建B系统

<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.ykq.dubbo</groupId>
    <artifactId>dubbo-b</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <!-- 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>
    </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.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user对象

package com.ykq.dubbo.pojo;

// 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;
    }

}

创建UserService(接口)提供查询服务

package com.ykq.dubbo.service;

import java.util.List;

import com.ykq.dubbo.pojo.User;

public interface UserService {

    /**
     * 查询所有的用户数据
     * 
     * @return
     */
    public List<User> queryAll();

}

创建UserServiceImp实现类

package com.ykq.dubbo.service.impl;

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

import com.ykq.dubbo.pojo.User;
import com.ykq.dubbo.service.UserService;

public class UserServiceImpl implements UserService {

    /**
     * 实现查询，这里做模拟实现，不做具体的数据库查询
     */
    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

<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="com.ykq.dubbo.service.UserService" ref="userServiceImpl" />

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

 
</beans>

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>

编写web.xml

<?xml version="1.0" encoding="UTF-8"?>
<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>

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启动tomcat

查看tomcat日志

2016-06-03 09:38:35,307 [localhost-startStop-1] [com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry]-[INFO]  [DUBBO] Register: dubbo://192.168.56.1:20880/com.ykq.dubbo.service.UserService?anyhost=true&application=dubbo-b-server&dubbo=2.5.3&interface=com.ykq.dubbo.service.UserService&methods=queryAll&pid=5436&side=provider&timestamp=1464917914608, dubbo version: 2.5.3, current host: 127.0.0.1

可以看到，已将userservice服务注册到zookeeper注册中心，协议是dubbo

搭建A系统

创建完成

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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>com.ykq.dubbo</groupId>
    <artifactId>dubbo-a</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <!-- 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>
    </dependencies>
</project>

配置log4j文件

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

从B系统中拷贝user对象，userservice接

编写dubbo配置文件

<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="com.ykq.dubbo.service.UserService"/>
 
</beans>

编写userservice测试用例

package com.ykq.dubbo.service;

import static org.junit.Assert.*;

import java.util.List;

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

import com.ykq.dubbo.pojo.User;

public class UserServiceTest {

    private UserService userService;

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

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

}