06.SpringCloud OpenFeign

落日映苍穹つ 2023-09-27 13:03 150阅读 0赞

## 06.SpringCloud OpenFeign ##

### OpenFeign介绍 ###

#### OpenFeign是什么 ####

![在这里插入图片描述][4b988d7aa42e4641a08ef579a51ba86b.png]

#### Feign和OpenFeign区别 ####

##### Feign #####

![在这里插入图片描述][cca8954f747a41cd85ccb62e580ba51f.png]

##### OpenFeign #####

![在这里插入图片描述][3e3815e9da83425c95b1be55bd96e5a4.png]

### OpenFeign-应用实例 ###

#### 需求分析/图解 ####

![在这里插入图片描述][ea8d4e9456ab4cb6a9cb4607fa34c755.png]

#### 创建服务消费模块-通过OpenFeigen实现远程调用 ####

##### 创建e-commerce-consumer-openfeign-80 服务 #####

![在这里插入图片描述][fe5d151abad244b29cd48d7163ed5c90.png]

##### 修改e-commerce-consumer-openfeign-80 的pom.xml文件 #####

<?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">
        <parent>
            <artifactId>e-commerce-center</artifactId>
            <groupId>com.hspedu.springcloud</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>e-commerce-consumer-openfeign-80</artifactId>
    
        
        <dependencies>
    
    
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</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-actuator</artifactId>
            </dependency>
    
    
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
    
            
            <dependency>
                <groupId>com.hspedu.springcloud</groupId>
                <artifactId>e_commerce_center-common-api</artifactId>
                <version>${project.version}</version>
            </dependency>
        </dependencies>
    
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
        </properties>
    
    </project>

##### 创建application.yml #####

server:
      port: 82
    
    spring:
      application:
        name: e-commerce-consumer-openfeign-80
    
    #配置eureka-client
    eureka:
      client:
        register-with-eureka: true # 将自己注册到 Eureka-server
        # 表示从 Eureka-server 抓取注册信息
        # 如果是单节点，是可以不配置的，但是如果是一个集群，则必须配置true
        # 才能配合Ribbon使用负载均衡
        fetch-registry: true
        service-url:
          #      defaultZone: http://localhost:9001/eureka/
          # 表示将自己注册到哪个eureka-server
          # 将本微服务注册到多个eureka-server,只有逗号间隔即可
          defaultZone: http://eureka9001.com:9001/eureka/,http://eureka9002.com:9002/eureka/

##### 创建MemberConsumerOpenfeignApplication 主启动类 #####

package com.hspedu.springcloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    
    @SpringBootApplication
    @EnableEurekaClient
    public class MemberConsumerOpenfeignApplication {
        
        public static void main(String[] args) {
        
            SpringApplication.run(MemberConsumerOpenfeignApplication.class,args);
        }
    }

##### MemberConsumerOpenfeignApplication添加注解 #####

// 启动IpenFeignClient
    @EnableFeignClients
    public class MemberConsumerOpenfeignApplication {

##### 创建MemberFeignService #####

@Component
    //MEMBER-SERVICE-PROVIDER 就是服务提供方在Eureka Server 注册的服务
    @FeignClient(value = "MEMBER-SERVICE-PROVIDER")
    public interface MemberFeignService {
        
    
        // 这里定义方法-就是远程调用的接口
        /**
         * 1.远程调用的方式是get
         * 2.远程调用的url http://MEMBER-SERVICE-PROVIDER/member/get/{id}
         * 3.MEMBER-SERVICE-PROVIDER 就是服务提供方在Eureka Server 注册的服务
         * 4.openfeign 会根据负载均衡来决定调用 -默认是轮询
         * 5.因为openfeign好处是支持springmvc注解 + 接口解耦
         */
        @GetMapping("/member/get/{id}")
        public Result getMemberById(@PathVariable("id") Long id);
    
    }

##### 创建MemberConsumerFeignController #####

@RestController
    public class MemberConsumerFeignController {
        
    
    //     装配MemberFeignService
        @Resource
        private MemberFeignService memberFeignService;
    
        @GetMapping("/member/consumer/openfeign/get/{id}")
        public Result getMemberById(@PathVariable("id") Long id){
        
            return memberFeignService.getMemberById(id);
        }
    
    }

#### 测试 ####

http://localhost:82/member/consumer/openfeign/get/2

### 日志配置 ###

#### 基本介绍 ####

![在这里插入图片描述][54a9b5d57f29462fa2ac5620190e9eed.png]

#### 配置日志-应用实例 ####

##### 在e-commerce-consumer-openfeign-80 创建 OpenFeignConfig.java #####

@Configuration
    public class OpenFeignConfig {
        
    
        @Bean
        public Logger.Level loggerLevel(){
        
            return Logger.Level.FULL;
        }
    }

##### 在e-commerce-consumer-openfeign-80 修改application.yml #####

logging:
      level:
        # 对MemberFeignService 接口调用过程打印信息-Debug
        com.hspedu.springcloud.service.MemberFeignService: debug

![在这里插入图片描述][cc3eac8758534fa796a49b3a9925dba5.png]

### OpenFeign超时 ###

##### 模拟超时 #####

在member-service-provider-10000 和member-service-provider-10002

的MemberController.getMemberById() 方法添加延时5秒

// 查询接口
    @GetMapping("member/get/{id}")
    public Result getMemberById(@PathVariable("id") Long id) {
        
    
        // 模拟超时，休眠5秒
        try {
        
            TimeUnit.MILLISECONDS.sleep(5000);
        } catch (InterruptedException e) {
        
            e.printStackTrace();
        }
    
        Member member = memberService.queryMemberById(id);
        if (member != null) {
        
            return Result.success("查询会员成功 member-service-provider-10000", member);
        } else {
        
            return Result.error("402", "ID=" + id + "不存在");
        }
    
    }

访问http://localhost:82/member/consumer/openfeign/get/2 超时

![在这里插入图片描述][700cd3546cec48e091a0b270cdd7defe.png]

##### 原因分析 ：OpenFeign 默认超时时间1秒钟，即等待返回结果1秒 #####

##### 设置超时时间 #####

###### 在 e-commerce-consumer-openfeign-80 的yml 添加 ######

ribbon:
      # 1.设置feign客户端超时时间(openfeign默认支持ribbon)
      # 2. ReadTimeout 建立连接从服务提供方获取可用资源的所用的全部时间
      # 3. 时间单位是毫秒
      ReadTimeout: 8000
      # 两端连接所用的时间
      ConnectionTimeout: 8000

##### 别忘了撤销超时测试代码和配置 #####

[4b988d7aa42e4641a08ef579a51ba86b.png]: https://img-blog.csdnimg.cn/4b988d7aa42e4641a08ef579a51ba86b.png
[cca8954f747a41cd85ccb62e580ba51f.png]: https://img-blog.csdnimg.cn/cca8954f747a41cd85ccb62e580ba51f.png
[3e3815e9da83425c95b1be55bd96e5a4.png]: https://img-blog.csdnimg.cn/3e3815e9da83425c95b1be55bd96e5a4.png
[ea8d4e9456ab4cb6a9cb4607fa34c755.png]: https://img-blog.csdnimg.cn/ea8d4e9456ab4cb6a9cb4607fa34c755.png
[fe5d151abad244b29cd48d7163ed5c90.png]: https://img-blog.csdnimg.cn/fe5d151abad244b29cd48d7163ed5c90.png
[54a9b5d57f29462fa2ac5620190e9eed.png]: https://img-blog.csdnimg.cn/54a9b5d57f29462fa2ac5620190e9eed.png
[cc3eac8758534fa796a49b3a9925dba5.png]: https://img-blog.csdnimg.cn/cc3eac8758534fa796a49b3a9925dba5.png
[700cd3546cec48e091a0b270cdd7defe.png]: https://img-blog.csdnimg.cn/700cd3546cec48e091a0b270cdd7defe.png