spring cloud （四、服务消费者demo_consumer）

spring cloud （一、服务注册demo_eureka）

spring cloud （二、服务注册安全demo_eureka）

spring cloud （三、服务提供者demo_provider）

写完这些案例的demo后面有时间再写这个框架的思想；

注册中心负责服务管理；提供者负责提供服务；消费者调用提供者的服务；

消费者的demo也是一样建一个spring boot 项目；然后修改pom文件如下：

<?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>consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
 
    <name>consumer</name>
    <description>Demo project for Spring Boot</description>
 
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.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>
    </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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.SR3</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-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

配置信息

#应用(服务)名称
spring.application.name=eureka-consumer
server.port=8771
eureka.client.serviceUrl.defaultZone=http://admin:admin@localhost:3333/eureka/

启动类

/**
 * 消费者
 */
@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class ConsumerApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(ConsumerApplication.class, args);
    }
}

到这里为止；服务注册、提供者、消费者三个demo已经可以正常启动了；并且在服务注册控制台也可以看到对应的服务信息；

---

接下来我们在提供者的demo中写一个服务；返回一个字符串

创建controller和service

接口

public interface TestService {
     String test01();
}

实现类

@Service
public class TestServiceImp implements TestService {
    @Override
    public String test01() {
        System.out.println(3);
        return "Hello World";
    }
}

controller

@Controller
public class TestController {
 
    @Autowired
    private TestService testService;
 
    @RequestMapping("/test")
    @ResponseBody
    public String home() {
        System.out.println(2);
        return testService.test01();
    }
}

---

接下来在消费者demo中写调用的代码

创建controller和service

接口

/**
 * //指定访问的服务名称
 */
@Service
@FeignClient(name= "eureka-provider")
public interface TestService {
    /**
     * 指定请求的url
     * @return
     */
    @RequestMapping(value = "/test")
    String hello();
}

以上服务名称和url都必须要和提供者那边的对应

---

controller

@Controller
public class TestController {
    @Autowired
    private TestService testService;
 
    @RequestMapping("/test01")
    @ResponseBody
    public String index() {
        System.out.println(1);
        return testService.hello();
    }
 
}

---

此时的代码已经写完了，我们通过访问http://localhost:8771/test01可以看到提供者那边返回的字符串