springcloud服务消费端feign方式之从消费端到注册中心-05

快来打我* 2022-03-28 07:24 284阅读 0赞

[springcloud入门详细搭建微服务环境-01][springcloud_-01]

[springcloud服务提供端-02][springcloud_-02]

springcloud服务消费端feign依赖于以上,feign一般是面向接口的：

### 1.导入依赖jar包 ###

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</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-test</artifactId>
            </dependency>
            
            <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-config</artifactId>
            </dependency>

### 2.写一个接口来消费服务 ###

package cn.mesmile.client;
    
    import cn.mesmile.User;
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    /**
     * @Created with IDEA
     * @author: Super Zheng
     * @Description: java类作用描述
     * @Date:2019/1/6
     * @Time:16:42
     *
     * @FeignClient 调服务的名字，映射服务
     */
    @FeignClient(value = "USER-PROVIDER")
    @RequestMapping("/provider")
    public interface UserClient {
    
        /**
         *  此方法用于接收参数
         * @param id
         * @return
         */
        @RequestMapping("/user/{id}")
        User getUser(@PathVariable(name = "id") Long id);
    }

### 3.写一个服务消费端入口类 ###

package cn.mesmile;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    import org.springframework.cloud.openfeign.EnableFeignClients;
    
    /**
     * @Created with IDEA
     * @author: Super Zheng
     * @Description: java类作用描述
     * @Date:2019/1/6
     * @Time:16:36
    
        @EnableFeignClients(basePackages = "cn.mesmile") 为扫描我们自定义的接口所在的包
     */
    @SpringBootApplication
    @EnableEurekaClient
    @EnableFeignClients(basePackages = "cn.mesmile")
    public class UserConsumerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(UserConsumerApplication.class);
        }
    }

### 4.写一个消费端的controller类 ###

package cn.mesmile.controller;
    
    import cn.mesmile.User;
    import cn.mesmile.client.UserClient;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @Created with IDEA
     * @author: Super Zheng
     * @Description: java类作用描述
     * @Date:2019/1/6
     * @Time:16:49
     */
    @RestController
    @RequestMapping("/consumer")
    public class UserController {
    
        @Autowired
        private UserClient userClient;
    
        /**
         * 通过调用接口的方法来从注册中心获取服务端数据
         * @param id
         * @return
         */
        @RequestMapping("/user/{id}")
        public User getUser(@PathVariable(name = "id") Long id){
            return userClient.getUser(id);
        }
    }

### 5.写服务消费端的配置 application.yml ###

server:
      port: 9003
    eureka:
      client:
        service-url:
         #defaultZone: http://localhost:7001/eureka #告诉服务提供者要把服务注册到哪里
         defaultZone: http://eureka-7001.com:7001/eureka,http://eureka-7002.com:7002/eureka
      instance:
        prefer-ip-address: true #显示客户端ip
    spring:
      application:
        name: USER-CONSUMER #不要使用下划线

### 6.启动注册中心入口类，启动服务提供端入口类，启动服务消费端入口类 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N1cHJlemhlbmc_size_16_color_FFFFFF_t_70][]

[springcloud_-01]: https://blog.csdn.net/suprezheng/article/details/86107570
[springcloud_-02]: https://blog.csdn.net/suprezheng/article/details/86180847
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