springcloud之eureka

废话不多说开搞:

先创建一个service 工程:

pom 依赖如下:

<dependencies>
        <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.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Edgware.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

启动类文件加上注解:@EnableEurekaServer
启动类代码如下:

@SpringBootApplication
@EnableEurekaServer
@PropertySource(value={"file:${INFOSYS_CONFIG}/eurekaserver.properties"})
public class EurekaserverApplication {

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

}

配置文件:

spring.application.name=spring-cloud-eureka

server.port=8000
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

eureka.client.serviceUrl.defaultZone=http://localhost:${server.port}/eureka/

启动后发现报错了
一顿操作后发现是boot 与cloud 版本不一样 将版本改成最新的或者pom 添加:

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

启动成功之后访问:http://localhost:8000,就能查看服务页面

image.png

当application下面显示No instances available,说明目前没有服务

再建一个producer工程

pom 依赖如下:

 <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>Edgware.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

配置文件如下:

spring.application.name=spring-cloud-admin
server.port=9000
eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/

启动类代码如下:

@SpringBootApplication
@PropertySource(value={"file:${INFOSYS_CONFIG}/eurekaproducer.properties"})
@EnableEurekaClient
@ComponentScans({@ComponentScan("com.rt.platform.business.**")})
public class EurekaproducerApplication {

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

服务启动成功之后,访问eureka页面可以看到服务注册上去了:

image.png

编写一个可调用接口:
controller 代码如下:

@RestController
public class HelloController {
    @RequestMapping("/hello")
    public String index(@RequestParam String name) {
        return "你好 "+name+"，欢迎来到cloud全家桶";
    }
}

再次启动服务并访问接口:http://localhost:9000/hello?name=hanmeimei
可以看到接口访问成功,页面展示:

image.png

接下来就是consumer工程了

pom 依赖如下:

<dependencies>
        <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.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</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>Edgware.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

配置文件如下:

spring.application.name=spring-cloud-consumer
server.port=9005
eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/

启动类代码如下:

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
@PropertySource(value={"file:${INFOSYS_CONFIG}/eurekaconsumer.properties"})
@ComponentScans({@ComponentScan("com.*.platform.business.**")})
public class EurekaconsumerApplication {

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

然后就是调用服务了,
调用服务就比较简单了,只需要在service 接口上添加 注解@FeignClient,加上你需要调用服务的服务名
service代码如下:

@Component
@FeignClient(value= "SPRING-CLOUD-ADMIN")
public interface HelloService {
    @RequestMapping(value = "/hello",method = RequestMethod.GET)
    String hello(@RequestParam(value = "name") String name);
}

在写一个controller,代码如下:

@RestController
public class ConsumerController {

    @Resource
    HelloService helloService ;

    @RequestMapping("/hello/{name}")
    public String index(@PathVariable("name") String name) {
        return helloService .hello(name);
    }
}

启动controller服务,发现报错了HelloService 获取不到,那就肯定是没扫描到包,然后在启动类注解后面添加路径:
@EnableFeignClients(basePackages = {"com.*.platform.business.service"})
启动成功
访问;http://localhost:9005/hello/%E6%9D%8E%E7%A3%8A

image.png
成功!
一个简单的eureka服务就搭好了