Spring Cloud 之 Ribbon with Eureka（五）

Spring Cloud 之 Ribbon with Eureka

使用eureka作爲註冊中心，服務端和客戶端分別向註冊中心註冊

        新建eureka 項目

RegisterCenterApplication.java

package registerCenter;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

/**
 * Created by sai.luo on 2017/4/26.
 */
@EnableEurekaServer  (Eureka 服務)
@SpringBootApplication
public class RegisterCenterApplication {
    public static void main(String[] args) {
        SpringApplication.run(RegisterCenterApplication.class,args);
    }
}

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>

    <artifactId>eureka</artifactId>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
            <version>1.2.5.RELEASE</version>
        </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>Camden.SR5</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>

application.yml

spring:
  application:
    name: registerCenter
server:
  port: 8761
eureka:
  instance: hostname
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
          defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
  server:
    eviction-interval-timer-in-ms: 30000
    enable-self-preservation: false  (自我保護關閉，熔斷模式時應該打開)


logging:
  level:
    com:
      netflix:
        eureka: OFF
        discovery: OFF

啓動eureka服務 端口8761

新建helloserviceeureka項目

HelloApplication.java

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by sai.luo on 2017/4/26.
 */

@SpringBootApplication
@EnableHystrix
@EnableHystrixDashboard
public class HelloApplication {
    public static void main(String[] args){
        SpringApplication.run(HelloApplication.class,args);
    }
}

HelloController.java

package hello;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.List;
import java.util.Random;

/**
 * Created by sai.luo on 2017/4/26.
 */
@RestController
@EnableDiscoveryClient //啓用服務發現
public class HelloController {
    private static Logger log = LoggerFactory.getLogger(HelloController.class) ;

    @GetMapping(value = "/greeting")
    public String greet(){
        log.info("access /greeting");

        List<String> hello_2 = Arrays.asList("hello-0", "hello-1", "hello_2");
        Random random = new Random();
        String s = hello_2.get(random.nextInt(hello_2.size()));
        return s ;

    }
    @GetMapping(value = "/1")
    public String home(){
        log.info("access /");
        return "hi";
    }
}

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>

    <artifactId>hello-service-eureka</artifactId>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--web 依賴-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--Eureka 服務依賴-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
            <version>1.2.5.RELEASE</version>
        </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>Camden.SR5</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>

application.xml

spring:
  application:
    name: hello

server:
  port: 9001

eureka:
  instance:
    lease-renewal-interval-in-seconds: 3
    lease-expiration-duration-in-seconds: 5
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
    registry-fetch-interval-seconds: 3

logging:
  level:
    com:
      netflix:
        eureka: OFF
        discovery: OFF

啓動服務 9001、9002、9003 

新建項目 ribboeureka

RibbonEurekaApplication.java

package ribbonEureka;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.context.annotation.Bean;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * Created by sai.luo on 2017/4/26.
 */

@SpringBootApplication
@EnableDiscoveryClient
@RestController

public class RibbonEurekaApplication {

    private static Logger log = LoggerFactory.getLogger(RibbonEurekaApplication.class);

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

    @RequestMapping(value = "/hi")
    @HystrixCommand(fallbackMethod = "callback")
    public String hi(@RequestParam(value = "name",defaultValue = "joe") String name){
        ResponseEntity<String> forEntity = this.restTemplate.getForEntity("http://hello/greeting", String.class);
        return String.format("%s %s",forEntity.getBody(),name);
    }
    private String callback(String name){
        return "callback something";
    }

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

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>

    <artifactId>ribbon-eureka</artifactId>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--#ribbon 依賴-->
<!--        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
        </dependency>-->
        <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.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>Camden.SR5</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>

application.yml

spring:
  application:
    name: helloClient

server:
  port: 20000

eureka:
  instance:
    lease-renewal-interval-in-seconds: 3
    lease-expiration-duration-in-seconds: 5

  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
    registry-fetch-interval-seconds: 3

logging:
  level:
    com:
      netflix:
        eureka: OFF
        discovery: OFF

啓動服務，訪問locolhost:20000/hi  實現了客戶端負載均衡

項目地址 https://github.com/luosai001/Spring-Cloud-Sample/tree/master 如果對您有幫助，請點贊，謝謝。