微服务之Feign远程调用

微服务之Feign远程调用

1.微服务之间一般都是业务分离,会创建一个独立的模块来存放接口,方便以后调用,以及防止代码的冗余和降低耦合性

2.导入feign的依赖

<dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
            <version>2.2.7.RELEASEversion>
dependency>

3.构建feign模块,并创建接口

@FeignClient(value = "leadnews-wemedia")//服务调用者
public interface IWemediaClient {

    /**
     * 频道分类查询
     * @return
     */
    @GetMapping("/api/v1/channel/list")
    public ResponseResult channel();
    
}

4.在leadnews-wemedia模块feign包下,创建一个实现类来实现远程接口,然后再对业务进行一个实现

import com.heima.apis.wemedia.IWemediaClient;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.wemedia.service.WmChannelService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class WemediaClient implements IWemediaClient {

    @Autowired
    private WmChannelService wmChannelService;
    /**
     * 查询所有频道分类
     * @return
     */
    @GetMapping("/api/v1/channel/list")
    @Override
    public ResponseResult channel() {
        return wmChannelService.findAllChannel();
    }
}

在leadnews-wemedia模块下也导入feign客户端依赖

<dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
            <version>2.2.7.RELEASEversion>
dependency>

并在启动类上添加注解@EnableFeignClients(basePackages = “com.wcl.apis”),basePackages对应的是feign模块下接口的路径

5.测试,通过spring容器注入接口,进行一个调用

    @Autowired
    private IWemediaClient iWemediaClient;
    
    @Test
    public void test(){
        ResponseResult channel = iWemediaClient.chanwnel();
    }
    

注:不同的模块业务下都可以进行一个远程调用,但一定要导入feign客户端的依赖和启动类添加注解
@EnableFeignClients(basePackages = “com.wcl.apis”)

<dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
            <version>2.2.7.RELEASEversion>
dependency>