菜鸟之路spring cloud 学习|第二篇 服务消费者

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http://blog.csdn.net/qq_29371103/article/details/78457583
本文出自张秋平的博客

• 上一章练习了服务的注册与发现。这章接着练习服务的消费我使用的是rest+ribbon

我们使用上一章的eureka-server 端口1111的为注册中心。

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

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

eureka-server 的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>

    <groupId>com.example</groupId>
    <artifactId>spring</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka-server</name>
    <description>eureka-server</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.7.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>Camden.SR7</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </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>
    <defaultGoal>compile</defaultGoal>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

hello-service 为提供者
hello-server的配置文件稍加修改

spring.application.name=hello-service
#server.port=${random.int[1000,8000]}
eureka.client.service-url.defaultZone=http://localhost:1111/eureka/

eureka-server 的配置文件

server.port=1111
eureka.instance.hostname=localhost
spring.application.name=eureka-server
#不注册自己
#eureka.client.register-with-eureka=false
#eureka.client.fetch-registry=false
eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

hello-service的代码

@RestController
public class HelloController {


    private final Logger log = Logger.getLogger(HelloController.class);

    @Autowired
    private DiscoveryClient client;

    @RequestMapping("/hello")
    public String index() {
        ServiceInstance instance = client.getLocalServiceInstance();
        log.info("/hello host:" + instance.getHost() +", serivice_id:"+ instance.getServiceId());

        return "Hello Word";
    }
}

applicatoin

@EnableDiscoveryClient
@SpringBootApplication
public class HelloServiceApplication {

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

本来想者使用随机端口可以直接启动多个提供者。以便省去命令行操作。但是发现随机产生的端口在控制台和注册中心不一致，暂时不知道什么原因。

hello-server 的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>

    <groupId>com.example</groupId>
    <artifactId>spring</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>hello-service</name>
    <description>service</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.7.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>Camden.SR7</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</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-test</artifactId>
            <scope>test</scope>
        </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>


</project>

接下来我们创建消费者
主要的依赖

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>

spring.application.name=ribbon-consumer

server.port=9000

eureka.client.service-url.defaultZone=http://localhost:1111/eureka
在配置文件里注册到1111的注册中心

在controller中注入resttemplate bean

@RestController
public class ConsumerController {

    @Autowired
    RestTemplate restTemplate;

    @RequestMapping(value="/ribbon-consumer",method=RequestMethod.GET)
    public String helloConsumer() {
        return restTemplate.getForEntity("http://HELLO-SERVICE/hello", String.class).getBody();
    }
}

在application 中

@EnableDiscoveryClient
@SpringBootApplication
public class RibbonConsumerApplication {

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

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

@LoadBalanced自动负载均衡。

这时我们可以看到注册中心的实例

上面有我们的消费者以及2个提供者。

我们请求消费

这时可以看到俩个消费者的控制台如下：

看。这就是服务消费。多么简单。
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