服务注册中心--Eureka
Eureka的基础知识
单机Eureka构建步骤
pom.xml
<!--eureka-server-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
application.yml
server:
port: 7001
eureka:
instance:
hostname: eureka7001.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不向注册中心注册自己。
fetch-registry: false #false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
service-url:
#集群指向其它eureka
# defaultZone: http://eureka7002.com:7002/eureka/
#单机就是7001自己
defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
server:
# 关闭自我保护机制，保证不可用服务被及时踢除
enable-self-preservation: false
eviction-interval-timer-in-ms: 2000
主启动类
测试
启动访问：localhost:7001
集群Eureka构建步骤
将8001注册到Eureka注册中心
pom.xml
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
application.yml
server:
port: 8001
spring:
application:
name: cloud-payment-service #模块名称
datasource:
type: com.alibaba.druid.pool.DruidDataSource # 当前数据源操作类型
driver-class-name: com.mysql.cj.jdbc.Driver # mysql驱动包
url: jdbc:mysql://localhost:3306/springcloud?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123456
eureka:
client:
register-with-eureka: true
fetch-registry: true
service-url:
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka #集群的配置
instance:
instance-id: payment8001
prefer-ip-address: true #访问路劲可以显示ip地址
mybatis:
mapperLocations: classpath:mapper/*.xml
type-aliases-package: com.czf.springcloud.entities # 所有Entity别名类所在包
logging:
level:
com.czf.springcloud.dao: debug
主启动类
package com.czf.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@SpringBootApplication
@EnableTransactionManagement //开启事务的自动管理
@EnableEurekaClient // 注册到服务注册中心
@EnableDiscoveryClient
public class PaymentMain8001 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8001.class,args);
}
}
测试
微服务注册名配置说明
80注册同理
server:
port: 80
spring:
application:
name: cloud-order-service
eureka:
client:
#表示是否将自己注册进EurekaServer，默认为true
register-with-eureka: true
#是否从EurekaServer抓取已有的注册信息，单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
fetch-registry: true
service-url:
#单机版只需要配置一个 defaultZone: http://eureka7001.com:7001/eureka
defaultZone: http://localhost:7001/eureka,http://localhost:7002/eureka #集群的配置
Eureka的集群配置
模拟2台注册中心
修改host文件做映射关系
测试
负载均衡
80端口控制层
package com.czf.springcloud.controller;
import com.czf.springcloud.entities.CommonResult;
import com.czf.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@Slf4j
public class OrderController
{
//public static final String PAYMENT_URL = "http://localhost:8001";
public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";
@Resource
private RestTemplate restTemplate;
@GetMapping("/consumer/payment/create")
public CommonResult<Payment> create(Payment payment)
{
return restTemplate.postForObject(PAYMENT_URL +"/payment/create",payment,CommonResult.class);
}
@GetMapping("/consumer/payment/get/{id}")
public CommonResult<Payment> getPayment(@PathVariable("id") Long id)
{
return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
}
@GetMapping("/consumer/payment/getForEntity/{id}")
public CommonResult<Payment> getPayment2(@PathVariable("id") Long id)
{
ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
if(entity.getStatusCode().is2xxSuccessful()){
return entity.getBody();
}else{
return new CommonResult<>(444,"操作失败");
}
}
配置负载均衡的配置
package com.czf.springcloud.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 ApplicationContextConfig {
@Bean
@LoadBalanced//使用@LoadBalanced注解赋予RestTemplate负载均衡的能力
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
测试
actuator微服务信息完善
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
效果
服务发现Discovery
package com.czf.springcloud.controller;
import com.czf.springcloud.entities.CommonResult;
import com.czf.springcloud.entities.Payment;
import com.czf.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import java.util.List;
@RestController
@Slf4j
public class PaymentController {
@Value("${server.port}")
private String serverPort;
/**
* 服务发现 获取服务信息
*/
@Resource
private DiscoveryClient discoveryClient;
@Resource
private PaymentService paymentService;
@PostMapping("/payment/create")
public CommonResult creat(@RequestBody Payment payment){
int result = paymentService.create(payment);
log.info("******插入结果："+result);
if (result>0){
return new CommonResult(200,"插入数据成功,serverPort"+serverPort,result);
}else {
return new CommonResult(444,"插入数据失败",null);
}
}
@GetMapping("/payment/get/{id}")
public CommonResult getPaymentById(@PathVariable("id") Long id){
Payment payment = paymentService.getPaymentById(id);
log.info("******查询结果："+payment);
if (payment != null){
return new CommonResult(200,"查询数据成功serverPort"+serverPort,payment);
}else {
return new CommonResult(444,"插叙失败，查询ID："+id,null);
}
}
@GetMapping("/payment/discovery")
public Object discovery(){
//查询Eureka下面有几个微服务
List<String> services = discoveryClient.getServices();
for (String element:services) {
log.info("*****element: "+element);
}
//查询某个微服务下的实例
List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
for (ServiceInstance instance:instances) {
log.info(instance.getServiceId()+"\t"+instance.getPort()+"\t"+instance.getHost()+"\t"+instance.getUri());
}
return this.discoveryClient;
}
@GetMapping(value = "/payment/lb")
public String getPaymentLB()
{
return serverPort;
}
}
eureka自我保护
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