Spring Cloud Alibaba + Dubbo + Nacos 整合例子
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Spring Cloud Alibaba + Dubbo + Nacos 整合例子
前言
我一共搭建了3个环境。
整体入口:
https://blog.csdn.net/lwb314/article/details/108222433
注意事项
- 这次使用的依赖是spring-cloud-starter-dubbo,这个我在git上没搜到,最后我发现他是spring-cloud-alibaba下的,spring-cloud-starter下的子项目,maven仓库里也找了一会才找到的,这个jar其实依赖的 例子2 里的dubbo-spring-boot-starter,所以这个例子应该跟例子2差不多
- 个人觉得还是使用这个例子3的比较靠谱,都知道在spring cloud家族里现在有个spring cloud alibaba,使用的是一套阿里的技术方案,性能更高,使用也更方便,我个人肯定是拥抱阿里,虽然阿里内部用的也不是这套开源技术╮(╯▽╰)╭无奈。不过毕竟像国外这些开源android,apache,spring这些东西可能用着用着就不让用了,呵呵。
代码
快速搭建
我的开发工具是IDEA,使用的是快速构建项目的Spring Initializr,前两个项目也是这么构建的,为什么要在这里单独提一下,因为这里必须要用阿里云快速构建,而不是用默认的spring快速构建,阿里云的构建地址是http://start.aliyun.com
具体看图
这页没啥说了,取个工程名,选下jdk版本
这一步一共有3个要注意的点,我已经圈出来了
第一个dubbo依赖,这个只有在阿里云里可以搜到,在spring-starter里搜不到,所以第一张图必须选阿里云;
第2个是版本使用spring boot 2.2这个大版;
第3个是我已经选好的2个依赖一个是spring boot web ,一个是nacos依赖,最后再把dubbo这个依赖选上就完成了。
依赖pom.xml
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.lwb</groupId>
<artifactId>spring-cloud-alibaba-dubbo-provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-cloud-alibaba-dubbo-provider</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.2.7.RELEASE</spring-boot.version>
<spring-cloud-alibaba.version>2.2.1.RELEASE</spring-cloud-alibaba.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- <dependency>-->
<!-- <groupId>org.springframework.boot</groupId>-->
<!-- <artifactId>spring-boot-starter-actuator</artifactId>-->
<!-- </dependency>-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-dubbo</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>${spring-cloud-alibaba.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.2.7.RELEASE</version>
<configuration>
<mainClass>com.lwb.springcloudalibabadubboprovider.SpringCloudAlibabaDubboProviderApplication
</mainClass>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
服务生产者代码-provider
application.properties
server.port=8003
spring.application.name=alibabadubboprovider
dubbo.application.id=alibabadubboprovider
dubbo.application.name=alibabadubboprovider
# 禁用QOS同一台机器可能会有端口冲突现象
dubbo.application.qos-enable=false
dubbo.application.qos-accept-foreign-ip=false
# 配置注册中心
dubbo.registry.address=nacos://10.10.171.249:8848
spring.cloud.nacos.discovery.server-addr=10.10.171.249:8848
dubbo.protocol.name=dubbo
dubbo.protocol.port=20883
dubbo.protocol.id=dubbo
启动类
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@EnableDubbo
@SpringBootApplication
public class SpringCloudAlibabaDubboProviderApplication {
public static void main(String[] args) {
SpringApplication.run(SpringCloudAlibabaDubboProviderApplication.class, args);
}
}
服务实现类
@Service(version = "1.0.2",group = "lwb")
public class DubboDemoServiceImpl implements DubboDemoService {
@Override
public String helloDubbo() {
return "helloDubboAlibaba";
}
}
服务接口
public interface DubboDemoService {
public String helloDubbo();
}
服务消费者代码-consumer
package com.lwb.springcloudalibabadubboconsumer;
import com.lwb.DubboDemoService;
import org.apache.dubbo.config.annotation.Reference;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import javax.annotation.PostConstruct;
@EnableDubbo
@SpringBootApplication
public class SpringCloudAlibabaDubboConsumerApplication {
@Reference(version = "1.0.2", check = false, group = "lwb")
private DubboDemoService demoService;
@PostConstruct
public void init() {
String a = demoService.helloDubbo();
System.out.println(a);
}
public static void main(String[] args) {
SpringApplication.run(SpringCloudAlibabaDubboConsumerApplication.class, args);
}
}
application.properties
server.port=8004
# 禁用QOS同一台机器可能会有端口冲突现象
spring.application.name=dubbo-starter-consumer
dubbo.application.name=dubbo-starter-consumer
dubbo.application.id=dubbo-starter-consumer
dubbo.application.qos-enable=false
dubbo.application.qos-accept-foreign-ip=false
# 配置注册中心
dubbo.registry.address = nacos://10.10.171.249:8848
spring.cloud.nacos.discovery.server-addr=10.10.171.249:8848
dubbo.registry.register=false
#dubbo.protocol.id=dubbo
遇坑总结
- spring.application.name= 不写报错:提示使用spring.application.name的时候报错了,写上了但是并不能改变nacos上的服务名。
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'targeterBeanPostProcessor' defined in class path resource [com/alibaba/cloud/dubbo/autoconfigure/DubboOpenFeignAutoConfiguration.class]: Unsatisfied dependency expressed through method 'targeterBeanPostProcessor' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.alibaba.cloud.dubbo.metadata.repository.DubboServiceMetadataRepository': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'spring.application.name' in value "${spring.application.name}"
- spring.cloud.nacos.discovery.server-addr= 不写报错,我的nacos服务器不在本地,日志却提示连本地连不上,肯定是因为我没写nacos地址
com.alibaba.nacos.api.exception.NacosException: failed to req API:/api//nacos/v1/ns/service/list after all servers([localhost:8848]) tried: java.net.ConnectException: Connection refused: connect
- dubbo.application.id=不写报错:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springCloudAlibabaDubboConsumerApplication': Injection of @Reference dependencies is failed; nested exception is java.lang.IllegalStateException: Invalid name="org.apache.dubbo.config.ApplicationConfig#0" contains illegal character, only digit, letter, '-', '_' or '.' is legal.
- 比前2个例子多出2个服务,是元数据,具体作用未知,怎么下掉未知,未来会慢慢研究。
最近我准备从0搭建一套基于Spring Cloud Alibaba的微服务框架
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