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nacos微服务调用

nacos微服务调用

作者: simplerandom | 来源:发表于2020-05-25 10:22 被阅读0次

    微服务工程依赖

    <?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>parent</artifactId>
            <groupId>org.limakilo</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>consumer</artifactId>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
        </dependencies>
    </project>
    

    application.yml文件

    server:
      port: 10001
    spring:
      application:
        name: consumer
      cloud:
        nacos:
          discovery:
            server-addr: 127.0.0.1:8848
    
    # 开启服务无法成功调用时,调用fallback类对应的方法
    feign:
      hystrix:
        enabled: true
    

    自定义feign客户端()
    调用hello方法会请求nacos-discovery-server服务对应的映射地址

    package org.limakilo;
    
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.GetMapping;
    
    @FeignClient(name="nacos-discovery-server",fallback = FeignError.class)
    public interface ForeignClient {
        @GetMapping("/hello")
        String hello();
    }
    

    fallback类

    package org.limakilo;
    
    import org.springframework.stereotype.Component;
    
    @Component
    public class FeignError implements  ForeignClient {
        @Override
        public String hello() {
            return "10001异常";
        }
    }
    

    启动类+controller类

    package org.limakilo;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.cloud.openfeign.EnableFeignClients;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    @EnableFeignClients
    @ResponseBody
    @SpringBootApplication
    @EnableDiscoveryClient
    @Controller
    public class ConsumerApplication {
        @Autowired
        ForeignClient foreignClient;
    
        public static void main(String[] args) {
            SpringApplication.run(ConsumerApplication.class);
        }
    
        @GetMapping("/hello")
        public String hello() {
    
            return foreignClient.hello();
        }
    }
    

    参考

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