目錄
Eureka服務端
1.啓動類
package com.eureka;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class AppEureka {
public static void main(String[] args) {
SpringApplication.run(AppEureka.class, args);
}
}
2.yml
server:
port: 8761
eureka:
instance:
hostname: 192.168.2.190
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
server:
# 測試時關閉自我保護機制,保證不可用服務及時踢出
enable-self-preservation: false
eviction-interval-timer-in-ms: 3000
3.pom
<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>com.test</groupId>
<artifactId>eureka</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
<version>1.3.4.RELEASE</version>
</dependency>
</dependencies>
<!--引入spring cloud依賴-->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<!--添加spring-boot 依賴-->
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
Eureka客戶端
1.啓動類
package com.cq;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@EnableEurekaClient
@SpringBootApplication
public class AppOrder {
public static void main(String[] args) {
SpringApplication.run(AppOrder.class, args);
}
}
2. yml
server:
port: 8002
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
register-with-eureka: true
fetch-registry: true
instance:
#Eureka服務端在收到最後一次心跳之後等待的時間上限,單位爲秒,超過則刪除(客戶端告訴服務端按照此規則等待自己)
lease-expiration-duration-in-seconds: 3
##Eureka客戶端向服務端發送心跳的時間間隔,單位爲秒(客戶端告訴服務端自己會按照該規則)
lease-renewal-interval-in-seconds: 1
spring:
application:
name: service-client
3. pom
<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>com.cq</groupId>
<artifactId>client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath />
</parent>
<dependencies>
<!--eureka-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
<version>1.3.4.RELEASE</version>
</dependency>
</dependencies>
<!--引入spring cloud依賴-->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.RELEASE</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>
4. 服務發現工具類
package com.cq.controller;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* 取模獲取服務註冊的URL
*
* @author qizhentao
* @version V1.0
*/
@RestController
public class PollURL {
@Autowired
private DiscoveryClient discoveryClient;
//初始化請求數
public static AtomicInteger requestCnt = new AtomicInteger(1);
/**
* 從服務列表中選擇一個地址
* @return ip:端口
*/
@RequestMapping("/getUrl")
public String getUrl(){
long currentTimeMillis = System.currentTimeMillis();// 耗時統計
//在註冊中心獲取對應的服務列表
List<ServiceInstance> list = discoveryClient.getInstances("service-client");
if(list == null) {
return null;
}
//獲取服務列表的數量
int serviceSize = list.size();
//請求數 % 服務列表數量 得到下標
int index = requestCnt.get() % serviceSize;
//將請求數增加1
requestCnt.incrementAndGet();
//根據計算的下標選取一個服務地址
System.out.println("選址用時:"+(System.currentTimeMillis() - currentTimeMillis));
return list.get(index).getUri().toString();
}
}
4.1 修改服務發現工具類-用於正式環境
package com.chuangqi.core.rpc;
import com.chuangqi.core.Conf;
import lombok.extern.log4j.Log4j2;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
/**
* RPC服務發現,從Eureka獲取服務地址
*
* @author qizhentao
* @version V1.0
*/
@Log4j2
public class ServerDiscover {
// RPC遠程調用案例說明!
/**
// Eureka客戶端
@Resource
private DiscoveryClient discoveryClient;
//調用sim-node-server服務的銷燬資源方法
@GetMapping("/getUrl")
public String getUrl() {
// 1. 封裝參數
HashMap<String, Object> paramMap = new HashMap<>();
paramMap.put("_method", "delete"); // 表示是Restful形式的delete請求
// 2. 獲取服務ip:port
String address = ServerDiscover.getSimNodeServerAddress(discoveryClient);
// 3. RPC遠程調用具體接口
String post = HttpUtil.post(address + "/master-node/resource", paramMap);
return post;
}
*/
/** 初始化請求數Eureka */
public static AtomicInteger requestCnt = new AtomicInteger(1);
/**
* 獲取‘1服務’集羣中的一個地址
*
* @return ip:port
*/
public static String getSimDisplayServerAddress(DiscoveryClient client) {
return new ServerDiscover().getChooseAddress("1服務名稱", client);
}
/**
* 獲取‘2服務’集羣中的一個地址
*
* @return ip:port
*/
public static String getSimNodeServerAddress(DiscoveryClient client) {
return new ServerDiscover().getChooseAddress("2服務名稱", client);
}
/**
* 根據服務名稱從服務列表中獲取一個地址
*
* @param serverName 服務名
* @param client Eureka客戶端接口DiscoveryClient
* @return ip:port
*/
public static String getAddress(String serverName, DiscoveryClient client) {
return new ServerDiscover().getChooseAddress(serverName, client);
}
private String getChooseAddress(String serverName, DiscoveryClient client) {
long start = System.currentTimeMillis();// 耗時統計
//在註冊中心獲取對應的服務列表
List<ServiceInstance> list = client.getInstances(serverName);
if (list == null || list.size() == 0) {
log.info("{}未發現服務", serverName);
return "";
}
//獲取服務列表的數量
int serviceSize = list.size();
//請求數 % 服務列表數量 得到下標
int index = requestCnt.get() % serviceSize;
//將請求數增加1
requestCnt.incrementAndGet();
//根據計算的下標選取一個服務地址
String address = list.get(index).getUri().toString();
long end = System.currentTimeMillis();
log.info("{}服務選址{}耗時:{}", serverName, address, end - start);
return address;
}
}