Ribbon负载均衡及Feign消费者调用服务
1、ribbon集成eureka完成服务调用
Ribbon是什么？
Ribbon是Netflix发布的开源项目，主要功能是提供客户端的软件负载均衡算法，将Netflix的中间层服务连接在一起。Ribbon客户端组件提供一系列完善的配置项如连接超时，重试等。简单的说，就是在配置文件中列出Load Balancer（简称LB）后面所有的机器，Ribbon会自动的帮助你基于某种规则（如简单轮询，随即连接等）去连接这些机器。我们也很容易使用Ribbon实现自定义的负载均衡算法。
加入pom.xml依赖，加入 ribbon相关依赖
org.springframework.cloud
spring-cloud-starter-eureka
org.springframework.cloud
spring-cloud-starter-ribbon
org.springframework.cloud
spring-cloud-starter-config
yml文件
server:
context-path: /
port: 80
eureka:
client:
service-url:
defaultZone: http://eureka2001.xhh.com:2001/eureka/,http://eureka2002.xhh.com:2002/eureka/,http://eureka2003.xhh.com:2003/eureka/
register-with-eureka: false
SpringCloudConfig
package com.xhh.microservicestudentconsumer80.config;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class SpringCloudConfig {
@LoadBalanced // 引入ribbon负载均衡
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
因为和eureka整合，所以启动类StudentConsumerApplication_80 加个注解 @EnableEurekaClient
我们的微服务应用名称是 microservice-student
所以服务调用者这边的控制器里PRE_HOST改成 http://MICROSERVICE-STUDENT即可；
先启动三个eureka，然后再启动服务提供者，再启动服务消费者；
执行这个http://localhost:1001/student/list
2、ribbon负载均衡
pom依赖
4.0.0
com.xhh
springcloud
1.0-SNAPSHOT
microservice-student-provider
com.xhh
microservice-common
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-starter-data-jpa
mysql
mysql-connector-java
org.springframework.boot
spring-boot-starter-tomcat
com.alibaba
druid-spring-boot-starter
org.springframework
springloaded
org.springframework.boot
spring-boot-devtools
com.xhh
microservice-common
1.0-SNAPSHOT
compile
org.springframework.cloud
spring-cloud-starter-eureka
org.springframework.cloud
spring-cloud-starter-config
org.springframework.boot
spring-boot-starter-actuator
org.springframework.boot
spring-boot-maven-plugin
yml文件
---
server:
port: 1001
context-path: /
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/xhh?useUnicode=true&characterEncoding=utf8
username: root
password: 123
jpa:
hibernate:
ddl-auto: update
show-sql: true
application:
name: microservice-student
profiles: provider-1001
eureka:
instance:
hostname: localhost
appname: microservice-student
instance-id: microservice-student:1001
prefer-ip-address: true
client:
service-url:
defaultZone: http://eureka2001.xhh.com:2001/eureka/,http://eureka2002.xhh.com:2002/eureka/,http://eureka2003.xhh.com:2003/eureka/
info:
groupId: com.xhh.springcloud
artifactId: microservice-student-provider-1001
version: 1.0-SNAPSHOT
userName: http://xhh.com
phone: 123456
---
server:
port: 1002
context-path: /
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/xhh?useUnicode=true&characterEncoding=utf8
username: root
password: 123
jpa:
hibernate:
ddl-auto: update
show-sql: true
application:
name: microservice-student
profiles: provider-1002
eureka:
instance:
hostname: localhost
appname: microservice-student
instance-id: microservice-student:1002
prefer-ip-address: true
client:
service-url:
defaultZone: http://eureka2001.xhh.com:2001/eureka/,http://eureka2002.xhh.com:2002/eureka/,http://eureka2003.xhh.com:2003/eureka/
info:
groupId: com.xhh.springcloud
artifactId: microservice-student-provider-1002
version: 1.0-SNAPSHOT
userName: http://xhh.com
phone: 123456
---
server:
port: 1003
context-path: /
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/xhh?useUnicode=true&characterEncoding=utf8
username: root
password: 123
jpa:
hibernate:
ddl-auto: update
show-sql: true
application:
name: microservice-student
profiles: provider-1003
eureka:
instance:
hostname: localhost
appname: microservice-student
instance-id: microservice-student:1003
prefer-ip-address: true
client:
service-url:
defaultZone: http://eureka2001.xhh.com:2001/eureka/,http://eureka2002.xhh.com:2002/eureka/,http://eureka2003.xhh.com:2003/eureka/
info:
groupId: com.xhh.springcloud
artifactId: microservice-student-provider-1003
version: 1.0-SNAPSHOT
userName: http://xhh.com
phone: 123456
3、feign集成ribbon调用
pom依赖
org.springframework.cloud
spring-cloud-starter-feign
StudentClientService接口
package com.xhh.microservicecommon.service;
import com.xhh.microservicecommon.entity.Student;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
/**
* Student Feign接口客户端
* @author Administrator
*
*/
@FeignClient(value="MICROSERVICE-STUDENT")
public interface StudentClientService {
/**
* 根据id查询学生信息
* @param id
* @return
*/
@GetMapping(value="/student/get/{id}")
public Student get(@PathVariable("id") Integer id);
/**
* 查询学生信息
* @return
*/
@GetMapping(value="/student/list")
public List list();
/**
* 添加或者修改学生信息
* @param student
* @return
*/
@PostMapping(value="/student/save")
public boolean save(Student student);
/**
* 根据id删除学生信息
* @return
*/
@GetMapping(value="/student/delete/{id}")
public boolean delete(@PathVariable("id") Integer id);
@RequestMapping("/student/ribbon")
public String ribbon();
}
2、新建一个Feign消费者项目
建一个microservice-student-consumer-feign-80
4.0.0
com.xhh
springcloud
1.0-SNAPSHOT
microservice-student-consumer-feign-80
1.8
org.springframework.boot
spring-boot-starter
org.springframework.boot
spring-boot-starter-test
test
org.junit.vintage
junit-vintage-engine
org.springframework.cloud
spring-cloud-commons
1.3.4.RELEASE
compile
org.springframework
spring-web
5.2.1.RELEASE
compile
org.springframework
spring-web
5.2.1.RELEASE
compile
com.netflix.ribbon
ribbon-loadbalancer
2.2.5
compile
org.springframework.cloud
spring-cloud-netflix-core
1.4.5.RELEASE
compile
org.springframework.cloud
spring-cloud-netflix-eureka-client
1.4.5.RELEASE
compile
org.springframework.boot
spring-boot-maven-plugin
SpringCloudConfig
package com.xhh.microservicestudentconsumerfeign80.config;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.RetryRule;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class SpringCloudConfig {
@LoadBalanced // 引入ribbon负载均衡
@Bean
public RestTemplate getRestTemplate() {
return new RestTemplate();
}
/**
* 自定义调用规则（服务提供者掉线后不再调用，解决轮询问题）
* @return
*/
@Bean
public IRule myRule(){
return new RetryRule();
}
}
MicroserviceStudentConsumerFeign80Application
package com.xhh.microservicestudentconsumerfeign80;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
@EnableEurekaClient
@EnableFeignClients(value = "com.xhh.*.*")
@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class MicroserviceStudentConsumerFeign80Application {
public static void main(String[] args) {
SpringApplication.run(MicroserviceStudentConsumerFeign80Application.class, args);
}
}
StudentConsumerController
package com.xhh.microservicestudentconsumerfeign80.conterller;
import com.xhh.microservicecommon.entity.Student;
import com.xhh.microservicecommon.service.StudentClientService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import java.util.List;
@RestController
@RequestMapping("/student")
public class StudentConsumerController {
@Autowired
private StudentClientService studentClientService;
@Autowired
private RestTemplate restTemplate;
@PostMapping(value = "/save")
private boolean save(Student student) {
return studentClientService.save(student);
}
@GetMapping(value = "/list")
public List list() {
return studentClientService.list();
}
@GetMapping(value = "/get/{id}")
public Student get(@PathVariable("id") Integer id) {
return studentClientService.get(id);
}
@GetMapping(value = "/delete/{id}")
public boolean delete(@PathVariable("id") Integer id) {
try {
studentClientService.delete(id);
return true;
} catch (Exception e) {
return false;
}
}
@RequestMapping("/ribbon")
public String ribbon(){
return studentClientService.ribbon();
}
}
