feign调用简单实例

Myth丶恋晨 2023-02-18 14:21 8阅读 0赞

表述一个简单的feign调用实现  
注意：对象只能传jsonString，不能传层数多的对象，会丢数据。

### 1. 服务端 ###

服务端添加一个client模块，专门用于跨微服务之间的feign调用；  
一下在该模块中操作。

#### 1.1 pom ####

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

#### 1.2 feign接口 ####

添加一个feign包，包中添加feign接口，用于调用该接口指向的业务实现代码，  
与feign包同级添加，对外的client客户端。  
![在这里插入图片描述][20200618133527682.png]  
feign接口代码  
它的业务实现代码此处略。

package cn.cncomdata.snowflake.feign;
    
    import cn.cncomdata.snowflake.vo.BaseVO;
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    
    import java.util.List;
    
    /** * author: xxx * date: 2019/1/21 13:57 */
    @FeignClient(name = "snowflake", url = "${snowflake.service.url}")
    public interface SnowflakeFeignClient { 
    
        @GetMapping("/id")
        BaseVO<Long> uniqueId();
    
    }

client代码

package cc.iooc.snowflake;
    
    import cn.cncomdata.snowflake.feign.SnowflakeFeignClient;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    import java.util.List;
    
    /** * @program: snowflake * @description: SnowflakeClient * @author: xxx * @create: 2019-03-21-12-51 **/
    @Component
    public class SnowflakeClient { 
        /** * snowflakeFeignClient */
        @Autowired
        private SnowflakeFeignClient snowflakeFeignClient;
    
        /** * uniqueId * * @return Long */
        public Long uniqueId() { 
            return snowflakeFeignClient.uniqueId().getData();
        }
    
    }

#### 1.3 推送maven包管理仓库 ####

方便项目加载，需要打包后推送到公司的maven中央仓库。

### 2.服务端 ###

#### 2.1 pom ####

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
            <dependency>
                <groupId>cn.cncomdata</groupId>
                <artifactId>snowflake-client</artifactId>
                <version>1.0.0</version>
            </dependency>
        <repositories>
            <repository>
                <id>nexus</id>
                <name>nexus</name>
                 <url>http://maven.cncomdata.cn/nexus/content/groups/public/</url>
                <releases>
                    <enabled>true</enabled>
                </releases>
            </repository>
        </repositories>

#### 2.2 application.yaml ####

#本地调用可以IP加端口号
    snowflake:
      service:
        url: ${ snowflake_service_url:http://snowflake.test.yunmesh.com:10016}
    feign:
      hystrix:
        enabled: false
      client:
        config:
          default:  # 服务名，default表示所有服务
            connectTimeout: 300000
            readTimeout: 300000
            loggerLevel: full

#### 2.3 启动类 ####

添加@EnableFeignClients

package cn.cncmmdata.form;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
    import org.springframework.cloud.openfeign.EnableFeignClients;
    
    /** * ElasticsearchApplication * @author admin */
    @SpringBootApplication(scanBasePackages = { "cn.cncomdata", "cc.iooc"},
            exclude = { DataSourceAutoConfiguration.class})
    @EnableFeignClients(basePackages = { "cn.cncomdata", "cc.iooc"})
    @MapperScan("cn.cncomdata.form.repository")
    public class FormApplication { 
    
        /** * main * * @param args args */
        public static void main(String[] args) { 
            SpringApplication.run(FormApplication.class, args);
        }
    
    }

#### 2.4 使用 ####

package cn.cncomdata.form.controller;
    
    import cc.iooc.snowflake.SnowflakeClient;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.annotation.Resource;
    
    /** * @Author: leimin * @Description: new class * @Date: 2020/6/18 13:45 * @Version: 1.0 */
    @RestController
    public class TestController { 
        
        @Resource
        private SnowflakeClient snowflakeClient;
    
        /** * id生成器 * @return Long id */
        @GetMapping("/id")
        public  Long getId(){ 
            
            return snowflakeClient.uniqueId();
        }
    }

[20200618133527682.png]: https://img-blog.csdnimg.cn/20200618133527682.png