1.服务注册和发现Eureka
可以用作服务治理。
2.首先我们建立一个父子工程
最外层是forezp
其下面建立四个子工程
eureka-server
eureka-client
eureka-client1
eureka-ribbon-client
3.forezp工程相关
1.forezp pom文件如下
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>forezp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>forezp</name>
<description>Demo project for Spring Boot</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Dalston.SR1</spring-cloud.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<modules>
<module>euraka-client</module>
<module>euraka-server</module>
<module>eureka-ribbon-client</module>
<module>euraka-client2</module>
</modules>
<!--<build>-->
<!--<plugins>-->
<!--<plugin>-->
<!--<groupId>org.springframework.boot</groupId>-->
<!--<artifactId>spring-boot-maven-plugin</artifactId>-->
<!--</plugin>-->
<!--</plugins>-->
<!--</build>-->
</project>
4.Eureka的服务中心:eureka-server相关
1.pom文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.example</groupId>
<artifactId>forezp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>euraka-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>euraka-server</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</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>
2.application.properties文件
server.port=8761
eureka.instance.hostname=localhost
#防止自己注册自己
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
#eureka的注册地址
eureka.client.service-url.default-zone=http://${eureka.instance.hostname}:${server.port}/eureka/}
3.需要在启动类添加 @EnableEurekaServer 注解来开启注册服务
package com.example.eurakaserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class EurakaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurakaServerApplication.class, args);
}
}
5.eureka-client和eureka-client1用来提供服务
这两个子工程其实区别不大,只是为了验证实现负载均衡。
1.pom文件
<?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>
<parent>
<groupId>com.example</groupId>
<artifactId>forezp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>euraka-client2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>euraka-client2</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</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>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.新建一个ApiController类
package com.example.eurakaclient2;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ApiController {
@Value("${server.port}")
String port;
@GetMapping("/hi")
public String home(@RequestParam String name1){
return "hi "+name1+"i am a port:"+port;
}
}
3.eureka-client 的 apllication.properties配置如下
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
server.port=8762
spring.application.name=eureka-client
4.eureka-client2的 apllication.properties配置如下
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
server.port=8763
spring.application.name=eureka-client
5.需要在启动类添加注解 @EnableEurekaClient,开启服务提供
package com.example.eurakaclient2;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class EurakaClient2Application {
public static void main(String[] args) {
SpringApplication.run(EurakaClient2Application.class, args);
}
}
6.eureka-ribbon-client工程相关
1.pom文件
<?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>
<parent>
<groupId>com.example</groupId>
<artifactId>forezp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>eureka-ribbon-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>eureka-ribbon-client</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</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>${spring-cloud.version}</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>
2.applicaiton.properties配置文件如下
spring.application.name=eureka-ribbon-client
server.port=8764
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
3.新建RibbonConfig类,在这里注入RestTemplate类同时开启负载均衡
package com.example.eurekaribbonclient;
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 RibbonConfig {
@Bean
@LoadBalanced
RestTemplate restTemplate(){
return new RestTemplate();
}
}
4.新建service层,调用eureka-client (eureka-client1)提供的restful接口,其中 eureka-client 为 eureka-client (eureka-client1)注册在 eureka-service上的serviceId信息,如果没有配置serviceId,默认使用spring.application.name
package com.example.eurekaribbonclient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
@Service
public class RibbonService {
@Autowired
RestTemplate restTemplate;
public String hi(String name){
return restTemplate.getForObject("http://eureka-client/hi?name1="+name,String.class);
}
}
5.新建controller层,调用RibbonService为我们提供的方法
package com.example.eurekaribbonclient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class RibbonController {
@Autowired
RibbonService ribbonService;
@GetMapping("/hi")
public String hi(@RequestParam(required = false,defaultValue = "forezp")String name){
return ribbonService.hi(name);
}
}
6.同时也需要在启动类添加@EnableEurekaClient注解
package com.example.eurekaribbonclient;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class EurekaRibbonClientApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaRibbonClientApplication.class, args);
}
}
7.验证
1.按照顺序启动工程
2.浏览器访问 http://localhost:8761/
可以看到EUREKA-CLIENT 和 EUREKA-RIBBON-CLIENT已经注册进来了
3.我们访问 http://localhost:8764/hi?name=forezp 两次
可以看到 页面分别返回
hi forezpi am a port:8762
hi forezpi am a port:8763
这样验证了我们实现了负载均衡。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。