.gitignore
@@ -1,4 +1,11 @@ # Compiled class file *.class # Log file *.log # BlueJ files *.ctxt # Mobile Tools for Java (J2ME) .mtj.tmp/ @@ -6,7 +13,11 @@ # Package Files # *.jar *.war *.nar *.ear *.zip *.tar.gz *.rar # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml hs_err_pid* .idea/.gitignore
New file @@ -0,0 +1,10 @@ # Default ignored files /shelf/ /workspace.xml # Editor-based HTTP Client requests /httpRequests/ # Environment-dependent path to Maven home directory /mavenHomeManager.xml # Datasource local storage ignored files /dataSources/ /dataSources.local.xml .idea/misc.xml
New file @@ -0,0 +1,4 @@ <?xml version="1.0" encoding="UTF-8"?> <project version="4"> <component name="KubernetesApiProvider">{}</component> </project> LICENSE
New file @@ -0,0 +1,201 @@ Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. 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@@ -1,4 +1,273 @@ ## algo-java ## 介绍 Dubbo是一款高性能、轻量级的开源Java RPC（Remote Procedure Call，远程过程调用）框架，它提供了分布式系统中服务之间的高效、透明化的服务调用方案。Dubbo最初由阿里巴巴公司开发并开源，现已成为Apache顶级项目。 ## 架构演变 在了解dubbo之后，我们要知道dubbo在当今互联网架构中在什么样的位置，我们先来看一个架构演进图  而了解过feign的同学这里就可以拿它和dubbo对比，在上面的图中，feign就是在微服务架构承担rpc框架，而dubbo就在在上面的SOA（（Service-Oriented Architecture，面向服务的架构）是一个组件模型，它将应用程序的不同功能单元（称为服务）进行拆分，并通过这些服务之间定义良好的接口和契约联系起来。）架构中承担rpc框架的角色。 SOA架构，就像是大部门制，一个部门管的事儿比较多，几个相关的工作一块儿干，这样大家协作起来方便，但是部门和部门之间还是得互相配合，有时候沟通多了就复杂了。而且，这种模式下，大家用的工具和流程尽量统一，为了好配合。 微服务架构呢，就像是小团队制，每个小团队就专攻一件事，特别专注，自己管自己那一块，出了问题也不容易影响别人。这种模式灵活多了，每个小团队还能根据自己的喜好选最好的工具干活，更新换代快。不过，这么多小团队，怎么让它们高效合作，也得好好设计一套规则。 ## DUBBO 说了这么多，其实dubbo的精髓就是**把自己的api暴露出去给大家，具体的实现继承自己的api去写实现方法。** 但是feign就可以完全脱离api提供，可以提供一个restful的http接口，然后其他服务可以直接通过feign进行调用，这也导致了feign的耦合度更低，但是feign在实际开发过程中也可以模仿dubbo暴露api的方式进行架构的搭建。 之前我们快速演示一下了dubbo，[每天一个新知识之 SpringBoot+Dubbo 的快速入门](https://blog.csdn.net/csdnerM/article/details/125410232) 要使用dubbo首先要搭建一个注册中心，注册中心的目的就是为了让其他的服务调用dubbo服务，在dubbo官方，推荐使用Zookeeper作为注册中心。 [公司居然还在用zookeeper，吓得我马上学习了相关命令！](https://juejin.cn/post/7376930488738938920) [Linux安装Zookeeper（图文解说详细版）](https://masiyi.blog.csdn.net/article/details/121848173) >  虽然之前也写过一篇dubbo的快速入门，但是写的简单，时隔两年，这次介绍一些Dubbo的高级特性。 ## 框架 我们先从框架的搭建说起  这次我们一共建了四个单独的模块，他们没有共同的父模块，但是他们之间有依赖关系，他们之间的关系是这样的：  在service模块中引入了Dubbo的jar包，这样，一套整体的dubbo模块框架就出来了 ``` <dependency> <groupId>com.alibaba.boot</groupId> <artifactId>dubbo-spring-boot-starter</artifactId> <version>0.2.0</version> </dependency> ``` 他们的作用分别是： api模块提供最基础的实体类，枚举类等，最重要是需要暴露出去的抽象接口。 service写具体的接口的实现类，提供具体的实现类。 rpc-server里面是一个启动类，因为依赖service模块，可以理解为生产提供者。 web-server则是主要提供http接口给第三方，如前端调用，也可以引入其他项目的api模块，之后只要有生产者注入到注册中心就可以提供服务了，直接调用api里面的抽象接口方法。 说这么多，我们来看里面的具体实现代码，由于篇幅问题，请移至代码仓库查看代码： [https://gitee.com/wangfugui-ma/springboot-dubbo/tree/dubbo/](https://gitee.com/wangfugui-ma/springboot-dubbo/tree/dubbo/) 那么，dubbo是需要搭配zookeeper去使用，由于上一篇文章已经讲过了，这里就不再赘述。我们怎么去使用dubbo的一些高级特性呢 ## 高级特性 ### 序列化 由于我们的实体类是写在api里面的，而api又是供各个项目去引用的，所以如果我们要在其他的项目中获取这个类，例如在这个项目中的queryUser方法中。 ```java package com.zy.controller; import com.alibaba.dubbo.config.annotation.Reference; import com.zy.entity.User; import com.zy.service.UserService; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class UserController { @Reference//远程注入 private UserService userService; @GetMapping("/user") public String user() { User user = userService.queryUser(); return user.toString(); } } ``` 我们的User对象必须实现Serializable接口，例如这样 ```java package com.zy.entity; import java.io.Serializable; public class User implements Serializable { private String name; private Integer age; public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "User{" + "name='" + name + '\'' + ", age=" + age + '}'; } } ``` ### 超时 #### 生产者超时 如果我们的生产者需要设置一个超时时间，我们可以在提供方的Service注解中加入timeout属性，就像这样： ```java package com.zy.support; import com.alibaba.dubbo.config.annotation.Service; import com.zy.entity.User; import com.zy.service.UserService; import org.springframework.stereotype.Component; @Service(timeout = 3000) @Component public class UserServiceSupport implements UserService { /** * 查询user */ @Override public User queryUser() { try { Thread.sleep(5000); } catch (InterruptedException e) { throw new RuntimeException(e); } User user = new User(); user.setAge(18); user.setName("王富贵"); return user; } } ``` 这样当我们的controller接口调用超过3秒的时候就会报错： ``` com.alibaba.dubbo.remoting.TimeoutException: Waiting server-side response timeout. start time: 2024-06-15 21:24:14.504, end time: 2024-06-15 21:24:17.511, client elapsed: 1 ms, server elapsed: 3006 ms, timeout: 3000 ms, request: Request [id=2, version=2.0.0, twoway=true, event=false, broken=false, data=RpcInvocation [methodName=queryUser, parameterTypes=[], arguments=[], attachments={path=com.zy.service.UserService, interface=com.zy.service.UserService, version=0.0.0, timeout=3000}]], channel: /10.8.0.136:8061 -> /10.8.0.136:20885 ``` 这样我们就从生产方加入了超时控制 #### 消费者超时 其实我们也可以从消费者这边控制超时时间，就像这样： ``` package com.zy.controller; import com.alibaba.dubbo.config.annotation.Reference; import com.zy.entity.User; import com.zy.service.UserService; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class UserController { @Reference(timeout = 1000)//远程注入 private UserService userService; @GetMapping("/user") public String user() { User user = userService.queryUser(); return user.toString(); } } ``` 在Reference注解中加入timeout属性也是可以达到一样的效果： ``` com.alibaba.dubbo.remoting.TimeoutException: Waiting server-side response timeout. start time: 2024-06-15 21:25:25.398, end time: 2024-06-15 21:25:26.399, client elapsed: 0 ms, server elapsed: 1001 ms, timeout: 1000 ms, request: Request [id=2, version=2.0.0, twoway=true, event=false, broken=false, data=RpcInvocation [methodName=queryUser, parameterTypes=[], arguments=[], attachments={path=com.zy.service.UserService, interface=com.zy.service.UserService, version=0.0.0, timeout=1000}]], channel: /10.8.0.136:8570 -> /10.8.0.136:20885 ``` ### @Autowired 除了使用@Reference注解注入dubbo服务外，还可以使用@Autowired去注入dubbo服务  ### 配置文件 ``` dubbo.application.name=web-server dubbo.registry.address=zookeeper://127.0.0.1:2181 ``` 在配置文件中写上最基础的两个配置，dubbo.registry.address可以不带zookeeper前缀，但是要加个配置key ``` # 如果不加这个，就需要在address里面加zookeeper:// dubbo.registry.protocol=zookeeper ``` 注意这个配置： ``` dubbo.protocol.port=20885 ``` dubbo默认用20880端口，如果你需要在一个服务器上面启动多个dubbo服务，那就不能让他们的端口冲突 ``` dubbo.registry.password=zk_password dubbo.registry.username=zk_user ``` 如果你的节点有acl权限，则可能需要加上这两个配置，替换value 如果你还不知道acl权限是什么，推荐你看一下这篇文章 [公司居然还在用zookeeper，吓得我马上学习了相关命令！](https://juejin.cn/post/7376930488738938920) ### @EnableDubbo 记得在启动类开启这个注解，否则不能使用dubbo的相关服务，你懂的。。。。 > 
New file @@ -0,0 +1,17 @@ <?xml version="1.0" encoding="UTF-8"?> <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.zy</groupId> <artifactId>api</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> </project> api/src/main/java/com/zy/entity/User.java
New file @@ -0,0 +1,32 @@ package com.zy.entity; import java.io.Serializable; public class User implements Serializable { private String name; private Integer age; public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "User{" + "name='" + name + '\'' + ", age=" + age + '}'; } } api/src/main/java/com/zy/service/UserService.java
New file @@ -0,0 +1,12 @@ package com.zy.service; import com.zy.entity.User; //todo 这里写一个自定义注解，之后通过自定义注解来获取该接口和实现类将其注册到注册中心 public interface UserService { /** * 查询user */ public User queryUser(); } rpc-server/pom.xml
New file @@ -0,0 +1,42 @@ <?xml version="1.0" encoding="UTF-8"?> <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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.5.3</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.zy</groupId> <artifactId>rpc-server</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.zy</groupId> <artifactId>service</artifactId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies> </project> rpc-server/src/main/java/com/zy/SpringBootRpcServerApplication.java
New file @@ -0,0 +1,17 @@ package com.zy; import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @EnableDubbo public class SpringBootRpcServerApplication { public static void main(String[] args) { SpringApplication.run(SpringBootRpcServerApplication.class, args); } }
New file @@ -0,0 +1,14 @@ # ???? spring.application.name=rpc-server server.port=8082 dubbo.application.name=rpc-server dubbo.registry.address=zookeeper://127.0.0.1:2181 #dubbo.registry.protocol=zookeeper #dubbo.registry.password=dreamtech #dubbo.registry.username=zk_user dubbo.protocol.name=dubbo dubbo.protocol.port=20880 dubbo.monitor.protocol=registry
New file @@ -0,0 +1,18 @@ # ???? spring.application.name=rpc-server server.port=8082 dubbo.application.name=rpc-server dubbo.registry.address=zookeeper://127.0.0.1:2181 #dubbo.registry.protocol=zookeeper #dubbo.registry.password=dreamtech #dubbo.registry.username=zk_user dubbo.protocol.name=dubbo dubbo.protocol.port=20880 dubbo.monitor.protocol=registry
New file @@ -0,0 +1,76 @@ <?xml version="1.0" encoding="UTF-8"?> <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.zy</groupId> <artifactId>service</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <dubbo.version>2.7.8</dubbo.version> <curator.version>4.2.0</curator.version> <curator-recipes.version>2.8.0</curator-recipes.version> <zookeeper.version>3.6.3</zookeeper.version> </properties> <dependencies> <!-- Dubbo Spring Boot Starter --> <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo-spring-boot-starter</artifactId> <version>2.7.8</version> </dependency> <!-- Dubbo Spring Boot Starter --> <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo-spring-boot-starter</artifactId> <version>${dubbo.version}</version> </dependency> <!-- zookeeper注册中心 需要导入zookeeper依赖 --> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>${zookeeper.version}</version> <!-- 提示与zookeeper中的slf4j-log4j12-1.7.29.jar 包冲突--> <!--排除这个slf4j-log4j12--> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> <exclusion> <groupId>log4j</groupId> <artifactId>log4j</artifactId> </exclusion> </exclusions> </dependency> <!-- Zookeeper 客户端 --> <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-framework</artifactId> <version>${curator.version}</version> </dependency> <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-recipes</artifactId> <version>${curator-recipes.version}</version> </dependency> <dependency> <groupId>com.zy</groupId> <artifactId>api</artifactId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies> </project> service/src/main/java/com/zy/support/UserServiceSupport.java
New file @@ -0,0 +1,26 @@ package com.zy.support; import com.zy.entity.User; import com.zy.service.UserService; import org.apache.dubbo.config.annotation.DubboService; @DubboService // 该注解用于将当前类对象存入spring容器中,既可以本项目服务使用，父接口注解能力也可以提供给其他项目使用 public class UserServiceSupport implements UserService { /** * 查询user */ @Override public User queryUser() { // try { // Thread.sleep(5000); // } catch (InterruptedException e) { // throw new RuntimeException(e); // } User user = new User(); user.setAge(18); user.setName("张三"); return user; } } web-server/pom.xml
New file @@ -0,0 +1,41 @@ <?xml version="1.0" encoding="UTF-8"?> <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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.5.3</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.zy</groupId> <artifactId>web-server</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.zy</groupId> <artifactId>service</artifactId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies> </project> web-server/src/main/java/com/zy/SpringBootAplication.java
New file @@ -0,0 +1,17 @@ package com.zy; import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @EnableDubbo public class SpringBootAplication { public static void main(String[] args) { SpringApplication.run(SpringBootAplication.class, args); } }
New file @@ -0,0 +1,22 @@ package com.zy.controller; import com.zy.entity.User; import com.zy.service.UserService; import org.apache.dubbo.config.annotation.DubboReference; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class UserController { @DubboReference(timeout = 1000)//远程注入 private UserService userService; @GetMapping("/user") public String user() { User user = userService.queryUser(); return user.toString(); } } web-server/src/main/resources/application.properties
New file @@ -0,0 +1,12 @@ # ???? spring.application.name=web-server # ???? WEB ???? server.port=8083 dubbo.protocol.name=dubbo dubbo.application.name=web-server dubbo.registry.address=zookeeper://127.0.0.1:2181 #dubbo.registry.password=dreamtech #dubbo.registry.username=zk_user dubbo.monitor.protocol=registry dubbo.protocol.port=20885
New file @@ -0,0 +1,14 @@ # ???? spring.application.name=web-server # ???? WEB ???? server.port=8083 dubbo.protocol.name=dubbo dubbo.application.name=web-server dubbo.registry.address=zookeeper://127.0.0.1:2181 #dubbo.registry.password=dreamtech #dubbo.registry.username=zk_user dubbo.monitor.protocol=registry dubbo.protocol.port=20885
