259 lines
7.9 KiB
Markdown
259 lines
7.9 KiB
Markdown
# Spring 整合 Dubbo(注解方式)
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<nav>
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<a href="#一-项目结构">一、 项目结构</a><br/>
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<a href="#二项目依赖">二、项目依赖</a><br/>
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<a href="#三公共模块">三、公共模块</a><br/>
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<a href="#四-服务提供者">四、 服务提供者</a><br/>
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<a href="#41-提供者配置">4.1 提供者配置</a><br/>
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<a href="#42--暴露服务">4.2 暴露服务</a><br/>
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<a href="#五服务消费者">五、服务消费者</a><br/>
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<a href="#51-消费者配置">5.1 消费者配置</a><br/>
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<a href="#52-调用远程服务">5.2 调用远程服务</a><br/>
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<a href="#六项目构建">六、项目构建</a><br/>
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<a href="#七Dubbo-控制台">七、Dubbo 控制台</a><br/>
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</nav>
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## 一、 项目结构
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按照 Dubbo 官方文档推荐的服务最佳化方案,建议将服务接口、服务模型、服务异常等均放在单独的 API 包中,所以项目采用 maven 多模块的构建方式,在 spring-dubbo 下构建三个子模块:
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- **dubbo-common**:公共模块,用于存放公共的接口和 bean,被 dubbo-provider 和 dubbo-provider 所引用;
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- **dubbo-provider** :服务的提供者,提供商品的查询服务;
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- **dubbo-provider** :是服务的消费者,调用 provider 提供的查询服务。
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另外,本项目 Dubbo 的搭建采用 ZooKeeper 作为注册中心。
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<div align="center"> <img src="https://gitee.com/heibaiying/spring-samples-for-all/raw/master/pictures/spring-dubbo.png"/> </div>
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## 二、项目依赖
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在父工程的项目中统一导入依赖 Dubbo 的依赖:
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```xml
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<!--dubbo 依赖-->
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<groupId>com.alibaba</groupId>
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<artifactId>dubbo</artifactId>
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<version>2.6.2</version>
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</dependency>
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<dependency>
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<groupId>org.apache.curator</groupId>
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<artifactId>curator-framework</artifactId>
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<version>4.0.0</version>
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<exclusions>
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<exclusion>
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<groupId>org.apache.zookeeper</groupId>
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<artifactId>zookeeper</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>org.apache.zookeeper</groupId>
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<artifactId>zookeeper</artifactId>
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<version>3.4.13</version>
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</dependency>
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```
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上面之所以要排除 curator-framework 中的 zookeeper,然后再次进行引入,是因为默认情况下 curator-framework 自动引用的最新的 3.5.x 的 zookeeper,但我本地安装是 3.4.x 的 zookeeper (因为我安装时候 zookeeper 3.5 还是 beta 版本),此时会出现 KeeperException$UnimplementedException 异常。因为 ZooKeeper 3.5.x 和 ZooKeeper 3.4.x 存在不兼容的情况,详见官方说明 [ZooKeeper Version Compatibility](https://curator.apache.org/zk-compatibility.html) 。
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## 三、公共模块
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- api 下为公共的调用接口;
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- bean 下为公共的实体类。
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<div align="center"> <img src="https://gitee.com/heibaiying/spring-samples-for-all/raw/master/pictures/dubbo-ano-common.png"/> </div>
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## 四、 服务提供者
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<div align="center"> <img src="https://gitee.com/heibaiying/spring-samples-for-all/raw/master/pictures/dubbo-ano-provider.png"/> </div>
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### 4.1 提供者配置
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```java
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@Configuration
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public class DubboConfiguration {
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/**
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* 提供方应用信息,用于计算依赖关系
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*/
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@Bean
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public ApplicationConfig applicationConfig() {
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ApplicationConfig applicationConfig = new ApplicationConfig();
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applicationConfig.setName("dubbo-ano-provider");
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return applicationConfig;
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}
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/**
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* 使用 zookeeper 注册中心暴露服务地址
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*/
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@Bean
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public RegistryConfig registryConfig() {
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RegistryConfig registryConfig = new RegistryConfig();
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registryConfig.setAddress("zookeeper://127.0.0.1:2181");
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registryConfig.setClient("curator");
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return registryConfig;
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}
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/**
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* 用 dubbo 协议在 20880 端口暴露服务
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*/
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@Bean
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public ProtocolConfig protocolConfig() {
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ProtocolConfig protocolConfig = new ProtocolConfig();
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protocolConfig.setName("dubbo");
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protocolConfig.setPort(20880);
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return protocolConfig;
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}
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}
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```
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### 4.2 暴露服务
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使用注解 @Service 暴露服务,需要注意的是这里的 @Service 注解不是 spring 的注解,而是 dubbo 的注解,完整路径为:com.alibaba.dubbo.config.annotation.Service :
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```java
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import com.alibaba.dubbo.config.annotation.Service;
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@Service(timeout = 5000)
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public class ProductService implements IProductService {
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private static List<Product> productList = new ArrayList<>();
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static {
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for (int i = 0; i < 20; i++) {
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productList.add(new Product(i, "产品" + i, i / 2 == 0, new Date(), 66.66f * i));
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}
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}
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public Product queryProductById(int id) {
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for (Product product : productList) {
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if (product.getId() == id) {
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return product;
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}
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}
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return null;
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}
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public List<Product> queryAllProducts() {
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return productList;
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}
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}
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```
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## 五、服务消费者
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<div align="center"> <img src="https://gitee.com/heibaiying/spring-samples-for-all/raw/master/pictures/dubbo-ano-consumer.png"/> </div>
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### 5.1 消费者配置
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```java
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@Configuration
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public class DubboConfiguration {
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/**
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* 消费方应用名,用于计算依赖关系,不是匹配条件,不要与提供方一样
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*/
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@Bean
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public ApplicationConfig applicationConfig() {
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ApplicationConfig applicationConfig = new ApplicationConfig();
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applicationConfig.setName("dubbo-ano-consumer");
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return applicationConfig;
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}
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/**
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* 设置调用服务超时时间
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* 关闭所有服务的启动时检查
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*/
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@Bean
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public ConsumerConfig consumerConfig() {
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ConsumerConfig consumerConfig = new ConsumerConfig();
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consumerConfig.setTimeout(3000);
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consumerConfig.setCheck(false);
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return consumerConfig;
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}
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/**
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* 使用 zookeeper 注册中心暴露发现服务地址
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*/
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@Bean
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public RegistryConfig registryConfig() {
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RegistryConfig registryConfig = new RegistryConfig();
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registryConfig.setAddress("zookeeper://127.0.0.1:2181");
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registryConfig.setClient("curator");
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return registryConfig;
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}
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}
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```
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### 5.2 调用远程服务
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使用注解 @Reference 引用远程服务:
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```java
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import com.alibaba.dubbo.config.annotation.Reference;
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@Controller
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@RequestMapping("sell")
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public class SellController {
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// dubbo 远程引用注解
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@Reference
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private IProductService productService;
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@RequestMapping
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public String productList(Model model) {
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List<Product> products = productService.queryAllProducts();
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model.addAttribute("products", products);
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return "products";
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}
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@RequestMapping("product/{id}")
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public String productDetail(@PathVariable int id, Model model) {
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Product product = productService.queryProductById(id);
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model.addAttribute("product", product);
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return "product";
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}
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}
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```
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## 六、项目构建
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在项目中,consumer 和 provider 模块均依赖公共模块,所以在构建 consumer 和 provider 模块前需要将 common 模块安装到本地仓库,依次对 父工程 和 common 模块执行以下命令:
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```shell
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mvn install -Dmaven.test.skip = true
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```
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## 七、Dubbo 控制台
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Dubbo 新版本管理控制台的安装步骤如下:
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```sh
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git clone https://github.com/apache/incubator-dubbo-ops.git /var/tmp/dubbo-ops
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cd /var/tmp/dubbo-ops
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mvn clean package
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```
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配置:
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```properties
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# 配置文件为:
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dubbo-admin-backend/src/main/resources/application.properties
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# 可以在其中修改zookeeper的地址
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dubbo.registry.address=zookeeper://127.0.0.1:2181
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```
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启动:
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```sh
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mvn --projects dubbo-admin-backend spring-boot:run
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```
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访问:
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```shell
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http://127.0.0.1:8080
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```
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