分布式技术之dubbo二

╰半橙微兮° 2023-09-29 16:48 18阅读 0赞

**1，课程回顾  
2，本章重点**  
父子工程的使用，子工程相互调用  
springboot+mybatis+dubbo+zookeeper+mysql  
部署一个dubbo\_admin治理项目（可以对提供者和消费者进行管理）  
dubbo负载均衡功能  
**3，具体内容  
3.1 springboot,mybatis整合dubbo**  
3.1.1创建父项目(springboot+mybatis方式创建)，pom.xml引入jar：

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.7</version>
        <relativePath/> 
      </parent>
     
    
    <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
    </dependency>
    
    <dependency>
    <groupId>com.alibaba.spring.boot</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>2.0.0</version>
    </dependency>
    
    <dependency>
    <groupId>com.101tec</groupId>
    <artifactId>zkclient</artifactId>
    <version>0.10</version>
    </dependency>

**3.1.2 创建子项目common**  
创建公共的实体类和服务层接口  
**3.1.3创建子项目consumer**

pom.xml
               <dependency>
                <groupId>com.aaa</groupId>
                <artifactId>common</artifactId>
                <version>0.0.1-SNAPSHOT</version>
            </dependency>

新建启动类并加入dubbo支持：

package com.aaa.pc;
    import com.alibaba.dubbo.spring.boot.annotation.EnableDubboConfiguration;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.SpringBootConfiguration;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    /**
     * @ fileName:PowerConsumerApplication
     * @ description:
     * @ author:zhz
     * @ createTime:2022/1/5 9:51
     * @ version:1.0.0
     */
    @SpringBootApplication
    @EnableDubboConfiguration  //开启dubbo配置
    public class PowerConsumerApplication {
        
        public static void main(String[] args) {
        
            //run方法
            SpringApplication.run(PowerConsumerApplication.class,args);
        }
    }

编写controller，引入Service:

@Reference(check=false)  
Dubbo 缺省会在启动时检查依赖的服务是否可用，不可用时会抛出异常，阻止 Spring 初始化完成，以便上线时，能及早发现问题，默认 check=“true”.  
可以通过 check=“false” 关闭检查，比如，测试时，有些服务不关心，或者出现了循环依赖，必须有一方先启动。

package com.aaa.pc.controller;
    import com.aaa.common.controller.BaseController;
    import com.aaa.common.entity.Menu;
    import com.aaa.common.service.MenuService;
    import com.aaa.common.util.Result;
    import com.alibaba.dubbo.config.annotation.Reference;
    import org.springframework.web.bind.annotation.*;
    import javax.annotation.Resource;
    import java.util.Map;
    /**
     * 菜单权限表(Menu)表控制层
     *
     * @author makejava
     * @since 2022-01-05 09:45:33
     */
    @RestController
    @RequestMapping("menu")
    public class MenuController extends BaseController {
        
        /**
         * 服务对象
         */
        @Reference(check = false)   //没有配置文件，直接使用引用注解
        private MenuService menuService;
        /**
         * 通过主键查询单条数据
         *
         * @param id 主键
         * @return 单条数据
         */
        @GetMapping("selectOne")
        public Result selectOne(Integer id) {
        
            return this.success(this.menuService.queryById(id));
        }
    
        /**
         * 添加
         *
         * @param menu
         * @return
         */
        @PutMapping("add")
        public Result add(@RequestBody Menu menu) {
        
            return this.success(this.menuService.insert(menu));
        }
        /**
         * 更新
         *
         * @param menu
         * @return
         */
        @PutMapping("update")
        public Result update(@RequestBody Menu menu) {
        
            return this.success(this.menuService.update(menu));
        }
        /**
         * 根据编号删除
         *
         * @param id
         * @return
         */
        @DeleteMapping("deleteById")
        public Result deleteById(Integer id) {
        
            return this.success(this.menuService.deleteById(id));
        }
    }
    application.properties:
    #访问端口号
    server.port=18090
    #dubbo - customer名称
    spring.dubbo.application.name=power_customer

## zookeeper 注册中心 ##

spring.dubbo.registry.address=zookeeper://192.168.170.41:2181  
\#dubbo 通信端口  
spring.dubbo.protocol.name=dubbo  
spring.dubbo.protocol.port=20881  
**3.1.4创建子项目provider**

pom.xml
           <dependency>
        <groupId>com.aaa</groupId>
        <artifactId>common</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.2.0</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.10</version>
    </dependency>
    
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.2.8</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.2.8</version>
    </dependency>

启动类加入：

package com.aaa.pp;
    import com.alibaba.dubbo.spring.boot.annotation.EnableDubboConfiguration;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.transaction.annotation.EnableTransactionManagement;
    /**
     * @ fileName:PowerProviderApplication
     * @ description:
     * @ author:zhz
     * @ createTime:2022/1/5 10:32
     * @ version:1.0.0
     */
    @SpringBootApplication
    @EnableDubboConfiguration
    //@EnableTransactionManagement
    public class PowerProviderApplication {
        public static void main(String[] args) {
            SpringApplication.run(PowerProviderApplication.class,args);
        }
    }
              
    编写服务实现类加入  @server 
                @com.alibaba.dubbo.config.annotation.Service
                @Service  为dubbo 注解，注解暴露服务
    application.properties:
    spring.datasource.druid.url=jdbc:mysql://localhost:3306/db_qy141
    spring.datasource.druid.username=root
    spring.datasource.druid.password=root
    spring.datasource.druid.initial-size=5
    spring.datasource.druid.max-active=20
    spring.datasource.druid.min-idle=10
    spring.datasource.druid.max-wait=10
    #端口号
    server.port=19090
    #dubbo 服务名称
    spring.dubbo.application.name=power_provider

## zookeeper 注册中心 ##

spring.dubbo.registry.address=zookeeper://192.168.170.41:2181  
\#zookeeper 通信端口  
spring.dubbo.protocol.name=dubbo  
spring.dubbo.protocol.port=20881  
3.2 服务治理  
3.2.1 多台zk集群  
前面配置过，直接启动  
3.2.2 配置治理项目，并且测试  
配置tomcat  
tar -xzvf /root/software/apache-tomcat-9.0.52.tar.gz -C /usr/  
vim /etc/profile  
修改为：

export PATH=$PATH:$JAVA_HOME/bin:$ZK_HOME/bin:/usr/apache-tomcat-9.0.52/bin

生效：  
source /etc/profile  
startup.sh  
查看是否启动成功  
jps 或者 ps -ef |grep tomcat |grep -v grep  
jps 可以看到Bootstrap进程  
复制准备好dubbo-admin项目到tomcat下  
使用xft 把dubbo-admin.war上传到/usr/apache-tomcat-9.0.52/webapps/  
修改配置  
vim /usr/apache-tomcat-9.0.52/webapps/dubbo-admin/WEB-INF/dubbo.properties  
修改第一行：  
127.0.0.1 修改为 192.168.xxx.41 (zk所在的机子IP)  
启动zk集群：  
/root/shelldir/zk-start-stop.sh  
测试  
http://192.168.170.41:8080/dubbo-admin/  
3.2.3 启动提供者和消费者，查看admin项目变化  
![图片: https://uploader.shimo.im/f/ySDnC68dAUNxYo9c.png图片:][https_uploader.shimo.im_f_ySDnC68dAUNxYo9c.png]  
![https://uploader.shimo.im/f/FDhixvC9OZ2yRb8W.png][https_uploader.shimo.im_f_FDhixvC9OZ2yRb8W.png]

3.3 负载均衡，集群容错， 服务降级（半权） 路由规则，动态配置，访问控制，权重调节  
打包生成多个服务：  
![图片: https://uploader.shimo.im/f/IiRUcBBdrK7b9UNQ.png][https_uploader.shimo.im_f_IiRUcBBdrK7b9UNQ.png]

![图片: https://uploader.shimo.im/f/kprUjYYTV3hS6eFF.png][https_uploader.shimo.im_f_kprUjYYTV3hS6eFF.png]

![图片: https://uploader.shimo.im/f/2qoOKsb8eqKh7QMn.png][https_uploader.shimo.im_f_2qoOKsb8eqKh7QMn.png]

![图片: https://uploader.shimo.im/f/wDCF90FmVJ8sMqRK.png][https_uploader.shimo.im_f_wDCF90FmVJ8sMqRK.png]

cd soft/  
使用xftp 把provider\_jar上传  
cd provider\_jar/  
java -jar  
java -jar provider.jar  
运行出错：slf4j-log4j12-1.7.26.jar  
修改META-INF/MANIFEST.MF文件，删除slf4j-log4j12-1.7.26.jar包，再次打包运行  
再次rebuild 时，要再次修改META-INF/MANIFEST.MF 文件中多余的jar  
![图片: https://uploader.shimo.im/f/11aeRlxJb1eGKqL5.png][https_uploader.shimo.im_f_11aeRlxJb1eGKqL5.png]

![图片: https://uploader.shimo.im/f/7Aa3F3g0E4g8u0To.png][https_uploader.shimo.im_f_7Aa3F3g0E4g8u0To.png]

![图片: https://uploader.shimo.im/f/TQRlmlHPby5nGMjP.png][https_uploader.shimo.im_f_TQRlmlHPby5nGMjP.png]

![图片: https://uploader.shimo.im/f/LxqKzO8dexFkDSS5.png][https_uploader.shimo.im_f_LxqKzO8dexFkDSS5.png]

**4，知识点总结  
5，本章面试题**

[https_uploader.shimo.im_f_ySDnC68dAUNxYo9c.png]: https://img-blog.csdnimg.cn/ad23cb0e7ddf4ab6b64899c366b5b887.png
[https_uploader.shimo.im_f_FDhixvC9OZ2yRb8W.png]: https://img-blog.csdnimg.cn/cc2b1b7e7c05479fad8cfe6cc9303b07.png
[https_uploader.shimo.im_f_IiRUcBBdrK7b9UNQ.png]: https://img-blog.csdnimg.cn/4d525ef79fd94b19a0bcda394c016aa8.png
[https_uploader.shimo.im_f_kprUjYYTV3hS6eFF.png]: https://img-blog.csdnimg.cn/f55344e0317c47deaf255e36fc5ed0ab.png
[https_uploader.shimo.im_f_2qoOKsb8eqKh7QMn.png]: https://img-blog.csdnimg.cn/1fa21d4001cd49c5af3bba36f9da5e6b.png
[https_uploader.shimo.im_f_wDCF90FmVJ8sMqRK.png]: https://img-blog.csdnimg.cn/8119a356593846c7a8315a61b00c1a3f.png
[https_uploader.shimo.im_f_11aeRlxJb1eGKqL5.png]: https://img-blog.csdnimg.cn/f631667092304811aba5ac38dc6d3135.png
[https_uploader.shimo.im_f_7Aa3F3g0E4g8u0To.png]: https://img-blog.csdnimg.cn/0b6e112247f343c88691530fe77d2565.png
[https_uploader.shimo.im_f_TQRlmlHPby5nGMjP.png]: https://img-blog.csdnimg.cn/cfc8bb9b355d49288c98201d5aed131d.png
[https_uploader.shimo.im_f_LxqKzO8dexFkDSS5.png]: https://img-blog.csdnimg.cn/2d730581ebfa40fcbdd5b1d242f3c5e5.png