SpringCloud个人笔记-02-Feign初体验

项目结构

sb_cloud_product

<?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.huarui</groupId><artifactId>sb_cloud_product</artifactId><version>0.0.1-SNAPSHOT</version><name>sb_cloud_product</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.13.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><spring-cloud.version>Edgware.SR3</spring-cloud.version></properties><dependencies><!-- eureka client --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency><!-- ribbon依赖 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-ribbon</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>

pom.xml

server:port: 9000spring:application:name: sb-cloud-producteureka:client:serviceUrl:defaultZone: http://localhost:8761/eureka/

application.yml

@SpringBootApplication
@EnableDiscoveryClient //开启服务注册
@EnableFeignClients　　 //开启Feign
public class SbCloudProductApplication {public static void main(String[] args) {SpringApplication.run(SbCloudProductApplication.class, args);}}

sb_cloud_order

<?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.huarui</groupId><artifactId>sb_cloud_order</artifactId><version>0.0.1-SNAPSHOT</version><name>sb_cloud_order</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.13.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><spring-cloud.version>Edgware.SR3</spring-cloud.version></properties><dependencies><!-- eureka client --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-feign</artifactId></dependency><!-- ribbon依赖 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-ribbon</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>

pom.xml

server:port: 9001spring:application:name: sb-cloud-ordereureka:client:serviceUrl:defaultZone: http://localhost:8761/eureka/

application.yml

@Configuration
public class RestTemplateConfig {@Bean@LoadBalancedpublic RestTemplate restTemplate(){return new RestTemplate();}}

@FeignClient(name = "sb-cloud-product")
public interface ProductRemote {/*** name:远程服务名，即spring.application.name配置的名称*类中的方法和远程服务中contoller中的方法名和参数需保持一致** @return*/@GetMapping(value = "/product/getMsg")public Map<String,String> getMsg();
}

RestTemplate三种访问服务端口接口方法

@RestController@RequestMapping("/order")public class OrderCtrl {

@Autowired private LoadBalancerClient loadBalancerClient;

@Autowired private RestTemplate restTemplate2;

@Autowired private ProductRemote productRemote;

/** * RestTemplate 三种使用方式 * @return */ @RequestMapping("/getProduct")public Map<String,String> getProduct(){

//http://localhost:9000/product/getMsg

 RestTemplate restTemplate = new RestTemplate();//1.第一种方式(直接通过地址访问) //Map<String,String> map = restTemplate.getForObject("http://localhost:9000/product/getMsg", Map.class);

 //2.第二种方式(利用loadBalancerClient通过应用名获取url) /*ServiceInstance serviceInstance = loadBalancerClient.choose("sb-cloud-product"); String url = String.format("http://%s:%s", serviceInstance.getHost(), serviceInstance.getPort() + "/product/getMsg"); Map<String,String> map = restTemplate.getForObject(url, Map.class);*/

 //3.第三种方式(通过@LoadBalanced注解让restTemplate获得负载均衡能力 访问接口时使用应用名字) Map<String,String> map = restTemplate2.getForObject("http://sb-cloud-product:9000/product/getMsg", Map.class);

return map;

 }

　　/* 通过feign 远程访问sb_cloud_product 服务 */@GetMapping("/feign/getProduct")public Map<String,String> feignGetProduct(){return productRemote.getMsg(); }

}

转载于:https://www.cnblogs.com/youxiu326/p/Feign.html

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