java B2B2C springmvc mybatis仿淘宝电子商城系统-服务消费者(rest+ribbon)

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一、ribbon简介 Ribbon is a client side load balancer which gives you a lot of control over the behaviour of HTTP and TCP clients. Feign already uses Ribbon, so if you are using @FeignClient then this section also applies. —–摘自官网 需要JAVA Spring Cloud大型企业分布式微服务云构建的B2B2C电子商务平台源码 一零三八七七四六二六 ribbon是一个负载均衡客户端,可以很好的控制htt和tcp的一些行为。Feign默认集成了ribbon。 ribbon 已经默认实现了这些配置bean: IClientConfig ribbonClientConfig: DefaultClientConfigImpl IRule ribbonRule: ZoneAvoidanceRule IPing ribbonPing: NoOpPing ServerList ribbonServerList: ConfigurationBasedServerList ServerListFilter ribbonServerListFilter: ZonePreferenceServerListFilter ILoadBalancer ribbonLoadBalancer: ZoneAwareLoadBalancer 二、建一个服务消费者 重新新建一个spring-boot工程,取名为:service-ribbon; 在它的pom.xml文件分别引入起步依赖spring-cloud-starter-eureka、spring-cloud-starter-ribbon、spring-boot-starter-web,代码如下: ``` <?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> <groupId>com.forezp</groupId> <artifactId>service-ribbon</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>service-ribbon</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.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</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-ribbon</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</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>Dalston.RC1</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> <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> ``` 在工程的配置文件指定服务的注册中心地址为http:/ /localhost:8761/eureka/,程序名称为 service-ribbon,程序端口为8764。配置文件application.yml如下: ``` eureka: client: serviceUrl: defaultZone: http://localhost:8761/eureka/ server: port: 8764 spring: application: name: service-ribbon ``` 在工程的启动类中,通过@EnableDiscoveryClient向服务中心注册;并且向程序的ioc注入一个bean: restTemplate;并通过@LoadBalanced注解表明这个restRemplate开启负载均衡的功能。 ``` @SpringBootApplication @EnableDiscoveryClient public class ServiceRibbonApplication { public static void main(String[] args) { SpringApplication.run(ServiceRibbonApplication.class, args); } @Bean @LoadBalanced RestTemplate restTemplate() { return new RestTemplate(); } } ``` 写一个测试类HelloService,通过之前注入ioc容器的restTemplate来消费service-hi服务的“/hi”接口,在这里我们直接用的程序名替代了具体的url地址,在ribbon中它会根据服务名来选择具体的服务实例,根据服务实例在请求的时候会用具体的url替换掉服务名,代码如下: ``` @Service public class HelloService { @Autowired RestTemplate restTemplate; public String hiService(String name) { return restTemplate.getForObject("http://SERVICE-HI/hi?name="+name,String.class); } } ``` 写一个controller,在controller中用调用HelloService 的方法,代码如下: ``` /** * Created by fangzhipeng on 2017/4/6. */ @RestController public class HelloControler { @Autowired HelloService helloService; @RequestMapping(value = "/hi") public String hi(@RequestParam String name){ return helloService.hiService(name); } } ``` 在浏览器上多次访问http:/ /localhost:8764/hi?name=forezp,浏览器交替显示: ``` hi forezp,i am from port:8762 hi forezp,i am from port:8763 ``` 这说明当我们通过调用restTemplate.getForObject(“http:/ /SERVICE-HI/hi?name=“+name,String.class)方法时,已经做了负载均衡,访问了不同的端口的服务实例。 [java B2B2C springmvc mybatis仿淘宝电子商城系统](https://2147775633.iteye.com/blog/2434341)
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