• 19.Feign 的工程化实例：eureka,ribbon,feign,hystrix（springcloud）

    项目模型

     

    项目结构

    本实例创建model都是通过maven手动创建，依赖进行手动导入，好处是比使用springboot模板创建更加灵活，更方便的进行父子模块的管理。

    1.创建父项目feign-project

     2.对父项目feign-project的pom.xml，进行手动导入依赖

    1. "1.0" encoding="UTF-8"?>
    2. <project xmlns="http://maven.apache.org/POM/4.0.0"
    3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    4.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    5.     <modelVersion>4.0.0modelVersion>
    6.     <modules>
    7.         <module>domain-projectmodule>
    8.         <module>common-apimodule>
    9.         <module>user-centermodule>
    10.         <module>order-centermodule>
    11.     modules>
    12.  
    13.     <parent>
    14.         <groupId>org.springframework.bootgroupId>
    15.         <artifactId>spring-boot-starter-parentartifactId>
    16.         <version>2.3.12.RELEASEversion>
    17.         <relativePath/> 
    18.     parent>
    19.     <packaging>pompackaging>
    20.     <groupId>com.itgroupId>
    21.     <artifactId>fegin-projectartifactId>
    22.     <version>0.0.1-SNAPSHOTversion>
    23.  
    24.     <properties>
    25.         <java.version>1.8java.version>
    26.         <spring-cloud.version>Hoxton.SR12spring-cloud.version>
    27.     properties>
    28.  
    29.     <dependencies>
    30.         <dependency>
    31.             <groupId>org.projectlombokgroupId>
    32.             <artifactId>lombokartifactId>
    33.             <optional>trueoptional>
    34.         dependency>
    35.  
    36.     dependencies>
    37.  
    38.     <dependencyManagement>
    39.         <dependencies>
    40.             <dependency>
    41.                 <groupId>org.springframework.cloudgroupId>
    42.                 <artifactId>spring-cloud-dependenciesartifactId>
    43.                 <version>${spring-cloud.version}version>
    44.                 <type>pomtype>
    45.                 <scope>importscope>
    46.             dependency>
    47.         dependencies>
    48.     dependencyManagement>
    49.  
    50.  
    51. project>

    3.domain-project子模块的创建

    3.1使用maven进行创建，选择父项目为feign-project

    2.pom.xml文件

    1. "1.0" encoding="UTF-8"?>
    2. <project xmlns="http://maven.apache.org/POM/4.0.0"
    3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    4.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    5.     <parent>
    6.         <artifactId>fegin-projectartifactId>
    7.         <groupId>com.itgroupId>
    8.         <version>0.0.1-SNAPSHOTversion>
    9.     parent>
    10.     <modelVersion>4.0.0modelVersion>
    11.  
    12.     <groupId>com.itgroupId>
    13.     <artifactId>domain-projectartifactId>
    14.  
    15.  
    16.  
    17.  
    18. project>

    3.3创建实体类Order

    1. package com.it.domain;
    2.  
    3. import lombok.AllArgsConstructor;
    4. import lombok.Builder;
    5. import lombok.Data;
    6. import lombok.NoArgsConstructor;
    7.  
    8. @Data
    9. @NoArgsConstructor
    10. @AllArgsConstructor
    11. @Builder
    12. public class Order {
    13.  
    14.     private Integer orderId;
    15.     private String name;
    16.     private Double price;
    17.  
    18. }

    4.common-api子模块的创建

    4.1.使用maven进行创建，选择父项目为feign-project

    4.2.pom.xml文件

    1. "1.0" encoding="UTF-8"?>
    2. <project xmlns="http://maven.apache.org/POM/4.0.0"
    3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    4.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    5.     <parent>
    6.         <artifactId>fegin-projectartifactId>
    7.         <groupId>com.itgroupId>
    8.         <version>0.0.1-SNAPSHOTversion>
    9.     parent>
    10.     <modelVersion>4.0.0modelVersion>
    11.  
    12.     <groupId>com.itgroupId>
    13.     <artifactId>common-apiartifactId>
    14.  
    15.  
    16.     <dependencies>
    17.         <dependency>
    18.             <groupId>com.itgroupId>
    19.             <artifactId>domain-projectartifactId>
    20.             <version>0.0.1-SNAPSHOTversion>
    21.         dependency>
    22.  
    23.         <dependency>
    24.             <groupId>org.springframework.cloudgroupId>
    25.             <artifactId>spring-cloud-starter-openfeignartifactId>
    26.         dependency>
    27.         <dependency>
    28.             <groupId>org.springframework.cloudgroupId>
    29.             <artifactId>spring-cloud-starter-netflix-hystrixartifactId>
    30.         dependency>
    31.  
    32.     dependencies>
    33.  
    34. project>

    4.3UserOrderFeign接口，做远程调用的接口

    1. package com.it.feign;
    2.  
    3. import com.it.domain.Order;
    4. import com.it.feign.hystrix.UserOrderFeignHystrix;
    5. import org.springframework.cloud.openfeign.FeignClient;
    6. import org.springframework.web.bind.annotation.GetMapping;
    7. import org.springframework.web.bind.annotation.RequestParam;
    8.  
    9. @FeignClient(value = "order-service",fallback = UserOrderFeignHystrix.class)
    10. public interface UserOrderFeign {
    11.  
    12.     //查询订单
    13.     @GetMapping("/order/getOrderByUserById")
    14.     Order getOrderByUserById(@RequestParam Integer userId);
    15.  
    16. }

    4.4UserOrderFeignHystrix实现类，做熔断器调用的方法

    1. package com.it.feign.hystrix;
    2.  
    3. import com.it.domain.Order;
    4. import com.it.feign.UserOrderFeign;
    5. import org.springframework.stereotype.Component;
    6.  
    7. @Component
    8. public class UserOrderFeignHystrix implements UserOrderFeign {
    9.  
    10.     /**
    11.      * 一般远程调用的熔断可以直接返回一个null值
    12.      * @param userId
    13.      * @return
    14.      */
    15.     @Override
    16.     public Order getOrderByUserById(Integer userId) {
    17.         return null;
    18.     }
    19. }

    5.order-center子模块的创建

    5.1使用maven进行创建，选择父项目为feign-project

     5.2pom.xml文件

    1. "1.0" encoding="UTF-8"?>
    2. <project xmlns="http://maven.apache.org/POM/4.0.0"
    3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    4.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    5.     <parent>
    6.         <artifactId>fegin-projectartifactId>
    7.         <groupId>com.itgroupId>
    8.         <version>0.0.1-SNAPSHOTversion>
    9.     parent>
    10.     <modelVersion>4.0.0modelVersion>
    11.  
    12.     <groupId>com.itgroupId>
    13.     <artifactId>order-centerartifactId>
    14.  
    15.     <dependencies>
    16.         <dependency>
    17.             <groupId>com.itgroupId>
    18.             <artifactId>common-apiartifactId>
    19.             <version>0.0.1-SNAPSHOTversion>
    20.         dependency>
    21.  
    22.         <dependency>
    23.             <groupId>org.springframework.bootgroupId>
    24.             <artifactId>spring-boot-starter-webartifactId>
    25.         dependency>
    26.         <dependency>
    27.             <groupId>org.springframework.cloudgroupId>
    28.             <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
    29.         dependency>
    30.  
    31.     dependencies>
    32.  
    33.     <build>
    34.         <plugins>
    35.             <plugin>
    36.                 <groupId>org.springframework.bootgroupId>
    37.                 <artifactId>spring-boot-maven-pluginartifactId>
    38.             plugin>
    39.         plugins>
    40.     build>
    41.  
    42.  
    43.  
    44. project>

    5.3application.yml文件

    1. server:
    2.   port: 8080
    3. spring:
    4.   application:
    5.     name: order-service
    6. eureka:
    7.   client:
    8.     service-url:
    9.       defaultZone: http://192.168.174.133:8761/eureka
    10.   instance:
    11.     hostname: localhost
    12.     instance-id: ${eureka.instance.hostname}:${spring.application.name}:${server.port}

    5.4OrderController类，实现另一个子模块common-api的UserOrderFeign接口，重写接口中的方法

    1. package com.it.controller;
    2.  
    3. import com.it.domain.Order;
    4. import com.it.feign.UserOrderFeign;
    5. import org.springframework.web.bind.annotation.RestController;
    6.  
    7. @RestController
    8. public class OrderController implements UserOrderFeign {
    9.  
    10.     @Override
    11.     public Order getOrderByUserById(Integer userId) {
    12.         System.out.println(userId);
    13.         Order order = Order.builder()
    14.                 .name("汉堡")
    15.                 .price(8D)
    16.                 .orderId(01)
    17.                 .build();
    18.         return order;
    19.     }
    20.  
    21. }

    5.5主函数类

    1. package com.it;
    2.  
    3. import org.springframework.boot.SpringApplication;
    4. import org.springframework.boot.autoconfigure.SpringBootApplication;
    5. import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    6.  
    7. @SpringBootApplication
    8. @EnableEurekaClient
    9. public class OrderServiceApp {
    10.     public static void main(String[] args) {
    11.         SpringApplication.run(OrderServiceApp.class,args);
    12.     }
    13. }

    6.创建子模块user-center

    6.1使用maven进行创建，选择父项目为feign-project

    6.2pom.xml文件

    1. "1.0" encoding="UTF-8"?>
    2. <project xmlns="http://maven.apache.org/POM/4.0.0"
    3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    4.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    5.     <parent>
    6.         <artifactId>fegin-projectartifactId>
    7.         <groupId>com.itgroupId>
    8.         <version>0.0.1-SNAPSHOTversion>
    9.     parent>
    10.     <modelVersion>4.0.0modelVersion>
    11.  
    12.     <groupId>com.itgroupId>
    13.     <artifactId>user-centerartifactId>
    14.  
    15.     <dependencies>
    16.         <dependency>
    17.             <groupId>com.itgroupId>
    18.             <artifactId>common-apiartifactId>
    19.             <version>0.0.1-SNAPSHOTversion>
    20.         dependency>
    21.         <dependency>
    22.             <groupId>org.springframework.bootgroupId>
    23.             <artifactId>spring-boot-starter-webartifactId>
    24.         dependency>
    25.         <dependency>
    26.             <groupId>org.springframework.cloudgroupId>
    27.             <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
    28.         dependency>
    29.  
    30.     dependencies>
    31.  
    32. project>

    6.3application.yml文件

    1. server:
    2.   port: 8081
    3. spring:
    4.   application:
    5.     name: user-service
    6. eureka:
    7.   client:
    8.     service-url:
    9.       defaultZone: http://192.168.174.133:8761/eureka
    10.   instance:
    11.     hostname: localhost
    12.     instance-id: ${eureka.instance.hostname}:${spring.application.name}:${server.port}
    13. feign:
    14.   hystrix:
    15.     enabled: true #开启熔断

    6.4UserController类，调用另一个子模块common-api的UserOrderFeign接口中的方法，进行远程调用

    1. package com.it.controller;
    2.  
    3. import com.it.domain.Order;
    4. import com.it.feign.UserOrderFeign;
    5. import com.netflix.discovery.converters.Auto;
    6. import org.springframework.beans.factory.annotation.Autowired;
    7. import org.springframework.web.bind.annotation.GetMapping;
    8. import org.springframework.web.bind.annotation.RestController;
    9.  
    10. import javax.annotation.Resource;
    11.  
    12. @RestController
    13. public class UserController {
    14.  
    15.  
    16.     @Resource
    17.     public UserOrderFeign userOrderFeign;
    18.  
    19.     @GetMapping("find")
    20.     public Order findOrder(){
    21.         Order orderByUserById = userOrderFeign.getOrderByUserById(01);
    22.         return orderByUserById;
    23.     }
    24.  
    25. }

    6.5主函数类

    1. package com.it;
    2.  
    3. import org.springframework.boot.SpringApplication;
    4. import org.springframework.boot.autoconfigure.SpringBootApplication;
    5. import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    6. import org.springframework.cloud.openfeign.EnableFeignClients;
    7.  
    8. @SpringBootApplication
    9. @EnableEurekaClient
    10. @EnableFeignClients
    11. public class UserServiceApp {
    12.     public static void main(String[] args) {
    13.         SpringApplication.run(UserServiceApp.class,args);
    14.     }
    15. }

    7.功能测试

    7.1oreder-center(8080),user-cneter(8081)都正常开启服务

     7.2当oreder-center（8080）服务宕机，进行开启熔断器，返回一个null值

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  • 原文地址：https://blog.csdn.net/weixin_59334478/article/details/127829523