Dubbo 在maven項目中的應用

時間 2019-11-06

標籤 dubbo maven 項目應用欄目 Dubbo 简体版

原文原文鏈接

首先咱們來看一下dubbo的架構：java

因此經過此圖，咱們看到就是服務的提供者將服務註冊到註冊中心，服務的消費者從註冊中心獲取服務，monitor監控服務的調用。git

關於dubbo的使用，咱們舉個簡單的例子：github

存在2個系統，A系統和B系統，A系統調用B系統的接口獲取數據，用於查詢用戶列表。web

廢話很少少，直接構建項目：spring

構建一個dubbo-ab-api ，此項目包含供其餘兩個項目使用的POJO類和接口Service類

一、在Eclipse中點檢新建項目，選擇maven項目後，點擊「next」：數據庫

二、項目存儲位置，點擊「next」：apache

三、由於創建的是「jar」項目，選擇「maven-archetype-quickstart」,點擊「next」：api

四、填寫Group ID（項目組織惟一的標識符）和Artifact ID（項目的惟一的標識符）點擊「Finish」，完成項目建立。tomcat

五、項目建立好後，在項目中增長pojo和service包：架構

六、在pojo包中添加User.java 類。

package cn.itcast.dubbo.pojo;

import java.io.Serializable;

public class User implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = -8096919250664823274L;
     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 [id=" + id + ", username=" + username + ", password=" + password + ", age=" + age + "]";
        }
        
        

}

七、在service包中UserService.java 接口類。

package cn.itcast.dubbo.service;

import java.util.List;

import cn.itcast.dubbo.pojo.User;

public interface UserService {
    /**
     * 查詢全部的用戶數據
     *
     * @return
     */
    public List<User> queryAll();
}

七、將JAR包安裝到本地倉庫，供其餘Maven項目依賴使用。(若是有maven私倉，則將jar包添加到maven私倉中，供其餘項目調用)

建立dubbo-b項目，此項目爲web項目，做爲服務提供方

一、在Eclipse中點檢新建項目，選擇maven項目後，點擊「next」：

二、項目存儲位置，點擊「next」：

三、創建web項目，選擇「maven-archetype-webapp」，點擊「next」：

四、填寫Group ID（項目組織惟一的標識符）和Artifact ID（項目的惟一的標識符）點擊「Finish」，完成項目建立。

五、項目建立好後，在項目中增長cn.itcast.dubbo.service.impl包：

六、在「pom.xml」導入依賴:

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>cn.itcast.dubbo</groupId>
  <artifactId>dubbo-b</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>dubbo-b Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
    <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>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.3.3</version>
          </dependency>

    <dependency>
            <groupId>cn.itcast.dubbo</groupId>
            <artifactId>dubbo-ab-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
 

      <dependency>
        <groupId>com.github.sgroschupf</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.1</version>
      </dependency>
      
      <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.3</version>
            <exclusions>
                <exclusion>
                    <!-- 排除傳遞spring依賴 -->
                    <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>

七、在cn.itcast.dubbo.service.impl包中建立UserServiceImpl實現類

package cn.itcast.dubbo.service.impl;

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

import cn.itcast.dubbo.pojo.User;
import cn.itcast.dubbo.service.UserService;

public class UserServiceImpl implements UserService {

     /**
     * 實現查詢，這裏作模擬實現，不作具體的數據庫查詢
     */
    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;
    }

}

八、在「src/main/resources」包中建立dubbo的配置文件「dubbo-applicationContext.xml」

<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">
 
    <!-- 提供方應用信息，用於計算依賴關係 -->
    <dubbo:application name="dubbo-b-server" />
 
    <!-- 這裏使用的註冊中心是zookeeper -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181" client="zkclient"/>
 
    <!-- 用dubbo協議在20880端口暴露服務 -->
    <dubbo:protocol name="dubbo" port="20880" />
 
    <!-- 將該接口暴露到dubbo中 -->
    <dubbo:service interface="cn.itcast.dubbo.service.UserService" ref="userServiceImpl" />
 
    <!-- 將具體的實現類加入到Spring容器中 -->
    <bean id="userServiceImpl" class="cn.itcast.dubbo.service.impl.UserServiceImpl" />
    
    <dubbo:monitor protocol="registry"></dubbo:monitor>
 
  
</beans>

九、使用spring與dubbo進行了無縫整合，要在web.xml中將配置文件引入

<?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_3_0.xsd"
    id="WebApp_ID" version="3.0">
    <display-name>dubbo-b</display-name>
    
    
    
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:dubbo-applicationContext.xml</param-value>
    </context-param>
     
     <!--Spring的ApplicationContext 載入 -->
    <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>

建立dubbo-a項目，做爲服務消費方。

一、在Eclipse中點檢新建項目，選擇maven項目後，點擊「next」：

二、項目存儲位置，點擊「next」：

三、由於創建的是「jar」項目，選擇「maven-archetype-quickstart」,點擊「next」：

四、填寫Group ID（項目組織惟一的標識符）和Artifact ID（項目的惟一的標識符）點擊「Finish」，完成項目建立。

五、在「pom.xml」導入依賴:

<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>cn.itcast.dubbo</groupId>
  <artifactId>dubbo-a</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>dubbo-a</name>
  <url>http://maven.apache.org</url>

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

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
            <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>
                    <!-- 排除傳遞spring依賴 -->
                    <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>cn.itcast.dubbo</groupId>
            <artifactId>dubbo-ab-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    
  </dependencies>
</project>

六、在「src/main/resources」包中建立配置服務的消費者「dubbo-consumer.xml」。

<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">
 
    <!-- 提供方應用信息，用於計算依賴關係 -->
    <dubbo:application name="dubbo-a-consumer" />
 
    <!-- 這裏使用的註冊中心是zookeeper -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181" client="zkclient"/>
     
    <!-- 從註冊中心中查找服務 -->
    <dubbo:reference id="userService" interface="cn.itcast.dubbo.service.UserService"/>
  
</beans>

七、編寫測試代碼

public static void main( String[] args )
    {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(
                "classpath:*.xml");
        UserService userService = applicationContext.getBean(UserService.class);
         List<User> users = userService.queryAll();
         for (User user : users) {
             System.out.println(user);
         }
        
        
        
        
    }