本篇内容介绍了“怎么使用Resttemplate和Ribbon调用Eureka实现负载均衡”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
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-servereureka-clienteureka-client1eureka-ribbon-client
3.forezp工程相关
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>${spring-cloud.version}}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <modules> <module>euraka-client</module> <module>euraka-server</module> <module>eureka-ribbon-client</module> <module>euraka-client2</module> </modules> <!--<build>--> <!--<plugins>--> <!--<plugin>--> <!--<groupId>org.springframework.boot</groupId>--> <!--<artifactId>spring-boot-maven-plugin</artifactId>--> <!--</plugin>--> <!--</plugins>--> <!--</build>--> </project>4.Eureka的服务中心:eureka-server相关
pom文件
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.example</groupId> <artifactId>forezp</artifactId> <version>0.0.1-SNAPSHOT</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>euraka-server</artifactId> <version>0.0.1-SNAPSHOT</version> <name>euraka-server</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR1</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${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>application.properties文件
server.port=8761 eureka.instance.hostname=localhost #防止自己注册自己eureka.client.register-with-eureka=falseeureka.client.fetch-registry=false#eureka的注册地址eureka.client.service-url.default-zone=http://${eureka.instance.hostname}:${server.port}/eureka/}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@EnableEurekaServerpublic 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。
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>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>新建一个ApiController类
package com.example.eurakaclient2; import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController; @RestControllerpublic class ApiController { @Value("${server.port}") String port; @GetMapping("/hi") public String home(@RequestParam String name1){ return "hi "+name1+"i am a port:"+port; }}eureka-client 的 apllication.properties配置如下
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/server.port=8762spring.application.name=eureka-clienteureka-client2的 apllication.properties配置如下
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/server.port=8763spring.application.name=eureka-client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@EnableEurekaClientpublic class EurakaClient2Application { public static void main(String[] args) { SpringApplication.run(EurakaClient2Application.class, args); } }6.eureka-ribbon-client工程相关
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>applicaiton.properties配置文件如下
spring.application.name=eureka-ribbon-clientserver.port=8764eureka.client.service-url.defaultZone=http://localhost:8761/eureka/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; @Configurationpublic class RibbonConfig { @Bean @LoadBalanced RestTemplate restTemplate(){ return new RestTemplate(); }}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); }}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; @RestControllerpublic class RibbonController { @Autowired RibbonService ribbonService; @GetMapping("/hi") public String hi(@RequestParam(required = false,defaultValue = "forezp")String name){ return ribbonService.hi(name); }}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@EnableEurekaClientpublic class EurekaRibbonClientApplication { public static void main(String[] args) { SpringApplication.run(EurekaRibbonClientApplication.class, args); } }7.验证
按照顺序启动工程
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
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。
“怎么使用Resttemplate和Ribbon调用Eureka实现负载均衡”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注编程网网站，小编将为大家输出更多高质量的实用文章！
