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dubbo转Spring Cloud

九点韶留学 2022-04-01 阅读 141
java后端

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/> <!-- lookup parent from repository -->
	</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>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.8.4</version>
        </dependency>

        <!-- dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.15.0-GA</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>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.5.0</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>
			<!-- dependency>
				<groupId>com.alibaba</groupId>
				<artifactId>dubbo-parent</artifactId>
				<version>2.8.4</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"/>

    <!--uncomment this if you want to test dubbo's monitor-->
    <!--<dubbo:monitor protocol="registry"/>-->

    <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。

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