feign介绍
Feign客户端是一个web声明式http远程调用工具,提供了接口和注解方式进行调用。
Spring Cloud 支持 RestTemplate Fetin
Feign客户端实际开发中用的最多 ,易读性比较强。
主要调用部分:
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.toov5</groupId> <artifactId>order</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> </parent> <!-- 管理依赖 --> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.M7</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <!-- SpringBoot整合Web组件 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- SpringBoot整合eureka客户端 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> </dependencies> <!-- 注意: 这里必须要添加, 否者各种依赖有问题 --> <repositories> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>
yml:
###服务启动端口号 server: port: 8002 ###服务名称(服务注册到eureka名称) spring: application: name: app-toov5-order ###服务注册到eureka地址 eureka: client: service-url: defaultZone: http://127.0.0.1:8100/eureka ###因为该应用为注册中心,不会注册自己 register-with-eureka: true ###是否需要从eureka上获取注册信息 fetch-registry: true
Feign
package com.toov5.Feign; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.RequestMapping; @FeignClient(name="app-toov5-member") //name就是服务名称 public interface MemberFeign { //Feign书写方式 以Spring mvc接口形式书写 @RequestMapping("/getMember") //接口形式 实现是交给Member实现的 public String getMember(); //底层自动转换成http协议实现rpc远程调用 }
controller
package com.toov5.api.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.toov5.Feign.MemberFeign; @RestController public class FeignController { @Autowired private MemberFeign memberFeign; @RequestMapping("/getFeignMember") public String feignMember() { return memberFeign.getMember(); } }
启动类:
package com.toov5; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.openfeign.EnableFeignClients; @SpringBootApplication(scanBasePackages={"com.toov5.*"}) @EnableEurekaClient @EnableFeignClients //可以开启feign客户端权限 public class AppOrder { public static void main(String[] args) { SpringApplication.run(AppOrder.class, args); } //解决RestTemplate找不到问题 把restTemplate注册到Spring Boot容器中 // @Bean // @LoadBalanced 手写的 不要去实现本地负载均衡效果了 // RestTemplate restTemplate() { // return new RestTemplate(); // } // }
Member(不用变) 服务提供者不变
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.toov5</groupId> <artifactId>member</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> </parent> <!-- 管理依赖 --> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.M7</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <!-- SpringBoot整合Web组件 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- SpringBoot整合eureka客户端 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> <!-- 注意: 这里必须要添加, 否者各种依赖有问题 --> <repositories> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>
yml:
###服务启动端口号 server: port: 8009 ###服务名称(服务注册到eureka名称) spring: application: name: app-toov5-member ###服务注册到eureka地址 eureka: client: service-url: ##当前会员注册到eureka服务 地址+端口号 defaultZone: http://127.0.0.1:8100/eureka ###因为该应用为注册中心,不会注册自己 register-with-eureka: true ###是否需要从eureka上获取注册信息 fetch-registry: true
controller
package com.toov5.api.controller; import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class MemberApiController { @Value("${server.port}") private String serverPort; @RequestMapping("/getMember") public String getMember() { return "会员服务"+serverPort; } }
启动类
package com.toov5.api; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient //注册到eureka public class AppMember { public static void main(String[] args) { SpringApplication.run(AppMember.class, args); } }
Eureka
pom:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.toov5</groupId> <artifactId>SpringCloud-eureka-server</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> </parent> <!-- 管理依赖 --> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.M7</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <!--SpringCloud eureka-server --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> </dependencies> <!-- 注意: 这里必须要添加, 否者各种依赖有问题 --> <repositories> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>
yml:
###eureka 服务端口号 server: port: 8100 ###服务注册名称 eureka: instance: ##注册中心ip地址 hostname: 127.0.0.1 ###客户端调用地址 client: serviceUrl: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ ###因为该应用为注册中心,不会注册自己 (集群设为true) register-with-eureka: false ###因为自己为注册中心 ,不会去在该应用中的检测服务 fetch-registry: false
启动:
package com.toov5; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @EnableEurekaServer //开启注册中心 @SpringBootApplication public class AppEureka { public static void main(String[] args) { SpringApplication.run(AppEureka.class, args); } }
原文地址:https://www.cnblogs.com/toov5/p/9955561.html
时间: 2024-11-06 07:26:28