spring cloud 学习笔记(1)

SpringCloud + Eureka / Nacos

git：https://github.com/huanmsf/springCloudLearn.git

项目目录:

父pom:

<?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>spring.cloud.learn</groupId>
    <artifactId>sc-learn</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>api</module>
        <module>consumer-eureka</module>
        <module>consumer-nacos</module>
        <module>provider-eureka</module>
        <module>provider-nacos</module>
        <module>eureka-server</module>
    </modules>

    <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.RELEASE</spring-cloud.version>
        <spring-boot.version>2.0.4.RELEASE</spring-boot.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
                <version>0.2.1.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
                <version>0.2.1.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
                <version>2.1.1.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
                <version>2.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                <version>2.0.3.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
                <version>2.1.1.RELEASE</version>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

基于Eureka的服务注册和发现 provider-eureka

目录

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>spring.cloud.learn</groupId>
        <artifactId>sc-learn</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <groupId>sc.learn.provider.eureka</groupId>
    <artifactId>provider-eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>provider-eureka</name>
    <description>Demo project for Spring Boot</description>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>spring.cloud.learn.api</groupId>
            <artifactId>api</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>spring.cloud.learn.api</groupId>
            <artifactId>api</artifactId>
            <version>2.1.4.RELEASE</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

    </dependencies>

</project>

application.yml

server:
  port: 7070

spring:
  application:
    name: provider-eureka

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8888/eureka/

ProviderEurekaApplication

@SpringBootApplication
@EnableEurekaClient
public class ProviderEurekaApplication {

    public static void main(String[] args) {
        SpringApplication.run(ProviderEurekaApplication.class, args);
    }

}

EchoServiceController

@RestController
@RequestMapping("/pe")
public class EchoServiceController {
    @Autowired
    private EchoService echoService;

    @GetMapping("/echo")
    public String echo(@RequestParam String name) {
        return echoService.echo(name);
    }
}

结果

基于Eureka的服务注册和发现 consumer-eureka

目录

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>spring.cloud.learn</groupId>
        <artifactId>sc-learn</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <groupId>sc.learn.consumer.eureka</groupId>
    <artifactId>consumer-eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>consumer-eureka</name>
    <description>Demo project for Spring Boot</description>

    <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.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>spring.cloud.learn.api</groupId>
            <artifactId>api</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>spring.cloud.learn.api</groupId>
            <artifactId>api</artifactId>
            <version>2.1.4.RELEASE</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

</project>

application.yml

server:
  port: 7000

spring:
  application:
    name: consumer-eureka

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8888/eureka/

ConsumerEurekaApplication

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
@EnableDiscoveryClient
public class ConsumerEurekaApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConsumerEurekaApplication.class, args);
    }

}

InvokeEchoServiceController

@RestController
@RequestMapping("/ce")
public class InvokeEchoServiceController {
    @Autowired
    private HelloController helloController;

    @GetMapping("/echo")
    public String echo(@RequestParam String name) {
        return helloController.hello(name);
    }

}

HelloController

@FeignClient(value = "provider-eureka")
public interface HelloController {
    @GetMapping("/pe/echo")
    String hello(@RequestParam(value = "name") String name);
}

结果

基于Nacos的服务注册和发现和配置中心 provider-nacos

目录

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>spring.cloud.learn</groupId>
        <artifactId>sc-learn</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <groupId>sc.learn.provider.nacos</groupId>
    <artifactId>provider-nacos</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>provider-nacos</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
    </dependencies>

</project>

bootstrap.properties

spring.application.name=provider-nacos
server.port=9090
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
spring.cloud.nacos.config.server-addr=127.0.0.1:8848

application.properties 空着,配置中心只能写在bootstrap.properties中,不然报错

ProviderNacosApplication

@SpringBootApplication
@EnableDiscoveryClient
public class ProviderNacosApplication {

    public static void main(String[] args) {
        SpringApplication.run(ProviderNacosApplication.class, args);
    }

}

EchoController

@RestController
@RequestMapping("/pn")
@RefreshScope
public class EchoController {
    @Value("${sys.user.name:null}")
    private String user;

    @GetMapping(value = "/hello")
    public String hello(@RequestParam String name) {
        return user + "Hello : " + name;
    }

    @GetMapping(value = "/echo")
    public String echo(@RequestParam String name) {
        return user + "Echo : " + name;
    }
}

结果

基于Nacos的服务注册和发现和配置中心 consumer-nacos

目录

bootstrap.properties

server.port=9000
spring.application.name=consumer-nacos
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
spring.cloud.nacos.config.server-addr=127.0.0.1:8848

ConsumerNacosApplication

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class ConsumerNacosApplication {

    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    public static void main(String[] args) {
        SpringApplication.run(ConsumerNacosApplication.class, args);
    }

}

EchoControllerCn

@RestController
@RequestMapping("/cn")
@RefreshScope
public class EchoControllerCn {

    private final RestTemplate restTemplate;
    @Value("${sys.user.name:null}")
    private String user;

    @Autowired
    public EchoControllerCn(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    @GetMapping(value = "/hello")
    public String echo(@RequestParam String name) {
        return restTemplate.getForObject("http://nacos-provider/pn/hello?name=" + name, String.class);
    }

    @Autowired
    private HelloController2 helloController2;
    @Autowired
    private HelloController helloController1;

    @GetMapping(value = "/hello1")
    public String echo1(String name) {
        return user + helloController1.hello(name);
    }

    @GetMapping(value = "/hello2")
    public String echo2(String name) {
        return user + helloController2.hello(name);
    }
}

HelloController

@FeignClient(value = "provider-nacos")
public interface HelloController {

    @GetMapping("/pn/hello")
    String hello(@RequestParam(value = "name") String name);

}

结果

Nacos 服务器

nacos多环境配置

参考：https://www.cnblogs.com/didispace/p/10340685.html#undefined

修改配置文件

nacos.config-dev.properties:

sys.user.name=user-dev

nacos.config-test.properties:

sys.user.name=user-test

指定配置文件前缀

spring.cloud.nacos.config.prefix=nacos.config

添加启动参数

-Dspring.profiles.active=test

结果：

Nacos配置