SpringCloud系列--3.负载均衡SpringCloud使用Ribbon
1.运行EurekaServer
pom.xml
<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>org.crazyit.cloud</groupId>
<artifactId>cloud-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>
</dependencies>
</project>
配置文件applicaiton.yml
server:
port: 8761
eureka:
client:
registerWithEureka: false
fetchRegistry: false
logging:
level:
com.netflix: INFO
启动类
package org.crazyit.cloud;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class FirstServer {
public static void main(String[] args) {
new SpringApplicationBuilder(FirstServer.class).run(args);
}
}
2.运行服务端
pom.xml
<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>org.crazyit.cloud</groupId>
<artifactId>cloud-provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
</dependencies>
</project>
配置文件application.yml
spring:
application:
name: cloud-provider
eureka:
instance:
hostname: localhost
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
服务类
package org.crazyit.cloud;
import javax.servlet.http.HttpServletRequest;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class FirstController {
@RequestMapping(value = "/person/{personId}", method = RequestMethod.GET,
produces = MediaType.APPLICATION_JSON_VALUE)
public Person findPerson(@PathVariable("personId") Integer personId, HttpServletRequest request) {
Person person = new Person();
person.setId(personId);
person.setName("Crazyit");
person.setAge(33);
person.setMessage(request.getRequestURL().toString());
return person;
}
}
启动类
package org.crazyit.cloud;
import java.util.Scanner;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class FirstServiceProvider {
public static void main(String[] args) {
// 读取控制台输入作为端口参数
Scanner scan = new Scanner(System.in);
String port = scan.nextLine();
// 设置启动的服务器端口
new SpringApplicationBuilder(FirstServiceProvider.class).properties(
"server.port=" + port).run(args);
}
}
然后运行时候分别启动端口8088,8099启动两个服务.
3. 调用端
pom.xml
<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>org.crazyit.cloud</groupId>
<artifactId>cloud-invoker</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</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-ribbon</artifactId>
</dependency>
</dependencies>
</project>
配置文件:里面指定了自定义的IRule 和 IPing 实现
server:
port: 9000
spring:
application:
name: cloud-invoker
cloud:
loadbalancer:
retry: false
eureka:
instance:
hostname: localhost
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
cloud-provider:
ribbon:
NFLoadBalancerRuleClassName: org.crazyit.cloud.MyRule
NFLoadBalancerPingClassName: org.crazyit.cloud.MyPing
package org.crazyit.cloud;
import com.netflix.loadbalancer.IPing;
import com.netflix.loadbalancer.Server;
public class MyPing implements IPing {
public boolean isAlive(Server server) {
System.out.println("自定义Ping类,服务器信息:" + server.getHostPort());
return true;
}
}
package org.crazyit.cloud;
import java.util.List;
import com.netflix.loadbalancer.ILoadBalancer;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.Server;
public class MyRule implements IRule {
private ILoadBalancer lb;
public Server choose(Object key) {
List<Server> servers = lb.getAllServers();
System.out.println("这是自定义服务器定规则类,输出服务器信息:");
for(Server s : servers) {
System.out.println(" " + s.getHostPort());
}
return servers.get(0);
}
public void setLoadBalancer(ILoadBalancer lb) {
this.lb = lb;
}
public ILoadBalancer getLoadBalancer() {
return this.lb;
}
}
启动类
package org.crazyit.cloud;
import org.crazyit.cloud.config.MyConfig;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class FirstInvoker {
public static void main(String[] args) {
SpringApplication.run(FirstInvoker.class, args);
}
}
主要看下面的服务类:
package org.crazyit.cloud;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerRetryProperties;
import org.springframework.cloud.netflix.ribbon.SpringClientFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import com.netflix.loadbalancer.ZoneAwareLoadBalancer;
@RestController
@Configuration
public class InvokerController {
@LoadBalanced
@Bean
public RestTemplate getRestTemplate() {
return new RestTemplate();
}
@RequestMapping(value = "/router", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public String router() {
RestTemplate restTpl = getRestTemplate();
// 根据名称调用服务
String json = restTpl.getForObject("http://cloud-provider/person/1",
String.class);
return json;
}
@Autowired
private LoadBalancerClient loadBalancer;
@RequestMapping(value = "/uselb", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public ServiceInstance uselb() {
// 查找服务器实例
ServiceInstance si = loadBalancer.choose("cloud-provider");
return si;
}
@Autowired
private SpringClientFactory factory;
@RequestMapping(value = "/defaultValue", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public String defaultValue() {
System.out.println("==== 输出默认配置:");
// 获取默认的配置
ZoneAwareLoadBalancer alb = (ZoneAwareLoadBalancer) factory
.getLoadBalancer("default");
System.out.println(" IClientConfig: "
+ factory.getLoadBalancer("default").getClass().getName());
System.out.println(" IRule: " + alb.getRule().getClass().getName());
System.out.println(" IPing: " + alb.getPing().getClass().getName());
System.out.println(" ServerList: "
+ alb.getServerListImpl().getClass().getName());
System.out.println(" ServerListFilter: "
+ alb.getFilter().getClass().getName());
System.out.println(" ILoadBalancer: " + alb.getClass().getName());
System.out.println(" PingInterval: " + alb.getPingInterval());
System.out.println("==== 输出 cloud-provider 配置:");
// 获取 cloud-provider 的配置
ZoneAwareLoadBalancer alb2 = (ZoneAwareLoadBalancer) factory
.getLoadBalancer("cloud-provider");
System.out.println(" IClientConfig: "
+ factory.getLoadBalancer("cloud-provider").getClass()
.getName());
System.out.println(" IRule: " + alb2.getRule().getClass().getName());
System.out.println(" IPing: " + alb2.getPing().getClass().getName());
System.out.println(" ServerList: "
+ alb2.getServerListImpl().getClass().getName());
System.out.println(" ServerListFilter: "
+ alb2.getFilter().getClass().getName());
System.out.println(" ILoadBalancer: " + alb2.getClass().getName());
System.out.println(" PingInterval: " + alb2.getPingInterval());
return "";
}
}
访问:
http://localhost:9000/router 由于我们自定义的负载规则只返回第一个,所以永远是
访问http://localhost:9000/defaultValue
输出:
自定义Ping类,服务器信息:localhost:8099
自定义Ping类,服务器信息:localhost:8088
==== 输出默认配置:
IClientConfig: com.netflix.loadbalancer.ZoneAwareLoadBalancer
IRule: com.netflix.loadbalancer.ZoneAvoidanceRule
IPing: com.netflix.niws.loadbalancer.NIWSDiscoveryPing
ServerList: org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList
ServerListFilter: org.springframework.cloud.netflix.ribbon.ZonePreferenceServerListFilter
ILoadBalancer: com.netflix.loadbalancer.ZoneAwareLoadBalancer
PingInterval: 30
==== 输出 cloud-provider 配置:
IClientConfig: com.netflix.loadbalancer.ZoneAwareLoadBalancer
IRule: org.crazyit.cloud.MyRule
IPing: org.crazyit.cloud.MyPing
ServerList: org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList
ServerListFilter: org.springframework.cloud.netflix.ribbon.ZonePreferenceServerListFilter
ILoadBalancer: com.netflix.loadbalancer.ZoneAwareLoadBalancer
PingInterval: 30
可见cloud-provider配置中使用的IRule,IPing是我们已定义的实现。
标题:SpringCloud系列--3.负载均衡SpringCloud使用Ribbon
作者:码农路上
地址:http://wujingjian.club/articles/2020/03/12/1584002618384.html