dubbo转Spring Cloud

Dear 丶 2022-05-23 01:45 166阅读 0赞

一个系统原来是使用dubbo的，现在想把微服务架构转为Spring Cloud。但是这个系统已经在使用中了，希望一步步的把dubbo服务一个个的转为Spring Cloud，转换一个使用一个，转换的过程中尽量少影响原系统。

比如现在要转换dubbo服务D1成Spring Cloud服务C1，D1又需要调用dubbo服务D2。怎么办呢？如果同时转换D1，D2的话，D2可能又会调用D3，这样可能引用一大堆服务。这种做法肯定不可取。一种更好的解决方案是：提供一个Spring Cloud的代理服务，这个代理服务同时是一个Spring Cloud服务和dubbo客户端，其作用就是将对Spring Cloud服务的调用转为对dubbo服务的调用。这样Spring Cloud服务C1需要调用的Spring Cloud服务C2就先以代理的方式实现。等服务C1测试完成后，再停掉代理中的C2，将D2转换为真正的Spring Cloud服务C2。这样逐步把所有的dubbo服务都转换成Spring Cloud服务。这种方案的优点是原系统不用做任何修改，避免了修改带来的风险。

这个方案的关键就是代理服务的实现。

假设有两个dubbo服务，分别为Hello1Service和Hello2Service如下：

public interface Hello1Service {
        String hello(String name);
    }
    public interface Hello2Service {
        String hello(String name);
    }

创建一个MAVEN项目。POM文件为：

<?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.example</groupId>
    	<artifactId>CloudDubboProxy</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>CloudDubboProxy</name>
    	<description>Cloud Dubbo Proxy</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.0.1.RELEASE</version>
    		<relativePath/> 
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    		<spring-cloud.version>Finchley.RC1</spring-cloud.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>dubbo</artifactId>
                <version>2.8.4</version>
            </dependency>
    
            
    
            <dependency>
                <groupId>org.apache.mina</groupId>
                <artifactId>mina-core</artifactId>
                <version>1.1.7</version>
            </dependency>
    
            <dependency>
                <groupId>org.glassfish.grizzly</groupId>
                <artifactId>grizzly-core</artifactId>
                <version>2.1.4</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.httpcomponents</groupId>
                <artifactId>httpclient</artifactId>
                <version>4.5.5</version>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.1.39</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.bsf</groupId>
                <artifactId>bsf-api</artifactId>
                <version>3.1</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.zookeeper</groupId>
                <artifactId>zookeeper</artifactId>
                <version>3.4.6</version>
            </dependency>
    
            <dependency>
                <groupId>com.github.sgroschupf</groupId>
                <artifactId>zkclient</artifactId>
                <version>0.1</version>
            </dependency>
    
            
    
            <dependency>
                <groupId>com.googlecode.xmemcached</groupId>
                <artifactId>xmemcached</artifactId>
                <version>1.3.6</version>
            </dependency>
    
            <dependency>
                <groupId>de.ruedigermoeller</groupId>
                <artifactId>fst</artifactId>
                <version>1.55</version>
            </dependency>
            
    	</dependencies>
    
    	<dependencyManagement>
    		<dependencies>
    			<dependency>
    				<groupId>org.springframework.cloud</groupId>
    				<artifactId>spring-cloud-dependencies</artifactId>
    				<version>${spring-cloud.version}</version>
    				<type>pom</type>
    				<scope>import</scope>
    			</dependency>
    						
    		</dependencies>
    	</dependencyManagement>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    
    	<repositories>
    		<repository>
    			<id>spring-milestones</id>
    			<name>Spring Milestones</name>
    			<url>https://repo.spring.io/milestone</url>
    			<snapshots>
    				<enabled>false</enabled>
    			</snapshots>
    		</repository>
    		<repository>
    	      <id>alimaven</id>
    	      <name>aliyun maven</name>
    	      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
    			<snapshots>
    				<enabled>false</enabled>
    			</snapshots>
    		</repository>
    		<repository>        
        		<id> central</id>        
        		<name> Maven Repository Switchboard</name>        
        		<layout> default</layout>        
        		<url> http://repo1.maven.org/maven2</url>        
        		<snapshots>        
          			<enabled> false</enabled>        
        		</snapshots>        
      		</repository> 
      	</repositories>
    
    
    </project>

dubbo的Spring配置文件：

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	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-2.5.xsd
    	http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    
        <dubbo:application name="demo-consumer" owner="programmer" organization="dubbox"/>
    
        <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    
        
        
    
        <dubbo:reference id="hello1Service" interface="com.alibaba.dubbo.demo.hello.Hello1Service"/>
        <dubbo:reference id="hello2Service" interface="com.alibaba.dubbo.demo.hello.Hello2Service"/>
    </beans>

Spring Cloud的配置文件：

#debug: true
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
    server:
      port: 9999
    spring:
      application:
        name: service-a
      application:
        name: service-b

注意：Spring Cloud 1.x中只支持一个服务，Spring Cloud 2.x中可以定义多个服务。

代理的启动类：

@SpringBootApplication
    @EnableEurekaClient
    @RestController
    public class CloudDubboProxyApplication {
        private static Hello1Service hello1Service;
        private static Hello2Service hello2Service;
    
    	public static void main(String[] args) {
    		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:application-context.xml");
            context.start();
            hello1Service = context.getBean(Hello1Service.class);
            hello2Service = context.getBean(Hello2Service.class);
    
            SpringApplication.run(CloudDubboProxyApplication.class, args);
    	}
    
        @RequestMapping("/a")
        public String ma(@RequestParam String name) {
        	String s = hello1Service.hello("world");
            return "From Cloud service A: "+name+"<br>"+s;
        }
    
        @RequestMapping("/b")
        public String mb(@RequestParam String name) {
        	String s = hello2Service.hello("world");
            return "From Cloud service B: "+name+"<br>"+s;
        }
    }

写个测试类：

@SpringBootApplication
    @EnableDiscoveryClient
    @RestController
    public class DemoRibbonApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(DemoRibbonApplication.class, args);
    	}
    	
    	@Bean
        @LoadBalanced
        RestTemplate restTemplate() {
            return new RestTemplate();
        }
    	
    	@Autowired
    	RestTemplate restTemplate;
    
    	@RequestMapping(value = "/a")
        public String ha(@RequestParam String name){
            return restTemplate.getForObject("http://SERVICE-A/a?name="+name,String.class);
        }    
    
    	@RequestMapping(value = "/b")
        public String hb(@RequestParam String name){
            return restTemplate.getForObject("http://SERVICE-B/b?name="+name,String.class);
        }    
    }

可以验证确实实现了Spring Cloud调用dubbo功能。