Spring Cloud之Feign客戶端調用工具
阿新 • • 發佈：2018-11-14
port ont parent 中心 img pin reg mave mode
feign介紹
Feign客戶端是一個web聲明式http遠程調用工具，提供了接口和註解方式進行調用。
Spring Cloud 支持 RestTemplate Fetin
Feign客戶端實際開發中用的最多 ，易讀性比較強。
主要調用部分：
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>
<!-- 管理依賴 -->
<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組件 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- SpringBoot整合eureka客戶端 -->
<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>
<!-- 註意： 這裏必須要添加， 否者各種依賴有問題 -->
<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：
###服務啟動端口號
server:
port: 8002
###服務名稱(服務註冊到eureka名稱)
spring:
application:
name: app-toov5-order
###服務註冊到eureka地址
eureka:
client:
service-url:
defaultZone: http://127.0.0.1:8100/eureka
###因為該應用為註冊中心，不會註冊自己
register-with-eureka: true
###是否需要從eureka上獲取註冊信息
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就是服務名稱 public interface MemberFeign { //Feign書寫方式 以Spring mvc接口形式書寫 @RequestMapping("/getMember") //接口形式 實現是交給Member實現的public String getMember(); //底層自動轉換成http協議實現rpc遠程調用 }
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(); } }
啟動類：
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 //可以開啟feign客戶端權限 public class AppOrder { public static void main(String[] args) { SpringApplication.run(AppOrder.class, args); } //解決RestTemplate找不到問題 把restTemplate註冊到Spring Boot容器中 // @Bean // @LoadBalanced 手寫的 不要去實現本地負載均衡效果了 // RestTemplate restTemplate() { // return new RestTemplate(); // } // }
Member(不用變) 服務提供者不變
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> <!-- 管理依賴 --> <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組件 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- SpringBoot整合eureka客戶端 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> <!-- 註意： 這裏必須要添加， 否者各種依賴有問題 --> <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：
###服務啟動端口號
server:
port: 8009
###服務名稱(服務註冊到eureka名稱)
spring:
application:
name: app-toov5-member
###服務註冊到eureka地址
eureka:
client:
service-url:
##當前會員註冊到eureka服務 地址+端口號
defaultZone: http://127.0.0.1:8100/eureka
###因為該應用為註冊中心，不會註冊自己
register-with-eureka: true
###是否需要從eureka上獲取註冊信息
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("${server.port}") private String serverPort; @RequestMapping("/getMember") public String getMember() { return "會員服務"+serverPort; } }
啟動類
package com.toov5.api; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient //註冊到eureka public class AppMember { public static void main(String[] args) { SpringApplication.run(AppMember.class, args); } }
Eureka
pom:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.toov5</groupId> <artifactId>SpringCloud-eureka-server</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> </parent> <!-- 管理依賴 --> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.M7</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <!--SpringCloud eureka-server --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> </dependencies> <!-- 註意： 這裏必須要添加， 否者各種依賴有問題 --> <repositories> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>
yml:
###eureka 服務端口號
server:
port: 8100
###服務註冊名稱
eureka:
instance:
##註冊中心ip地址
hostname: 127.0.0.1
###客戶端調用地址
client:
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
###因為該應用為註冊中心，不會註冊自己 （集群設為true）
register-with-eureka: false
###因為自己為註冊中心 ,不會去在該應用中的檢測服務
fetch-registry: false
啟動：
package com.toov5; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @EnableEurekaServer //開啟註冊中心 @SpringBootApplication public class AppEureka { public static void main(String[] args) { SpringApplication.run(AppEureka.class, args); } }
Spring Cloud之Feign客戶端調用工具