通过Feign远程调用第三方接口

远程调用第三方接口的有几种方法，常用就是用HttpClient、RestTemplate等组件，其实SpringCloud的Fegin组件也可以 用于第三方接口调用。

1、引入Maven插件

        <!-- feign核心包 -->
        <dependency>
            <groupId>io.github.openfeign</groupId>
            <artifactId>feign-core</artifactId>
            <version>10.4.0</version>
        </dependency>

2、编写Feign配置类，用于创建Fegin调用服务

import com.foresee.sznf.wxgzh.service.FeignYcqhActionService;
import feign.Feign;
import feign.Request;
import feign.Retryer;
import feign.httpclient.ApacheHttpClient;
import feign.jackson.JacksonDecoder;
import feign.jackson.JacksonEncoder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

/**
 * @author chenweifeng
 * @version 0.0.1
 * @date 2019/11/13 09:38
 * @since JDK 10
 */
@Slf4j
@Configuration
@Component
public class FeignConfig {

    private String baseUrl="xxxxxxxxxxxxx";

    /**
     * 初始化feign服务
     *
     * @return
     */
    @Bean
    public FeignYcqhActionService initFeignYcqhActionService() {

        FeignYcqhActionService feignYcqhActionService = Feign.builder().client(new ApacheHttpClient())
                .encoder(new JacksonEncoder())
                .decoder(new JacksonDecoder())
                .options(new Request.Options(1000, 3500))
                .retryer(new Retryer.Default(5000, 5000, 3))
                .target(FeignYcqhActionService.class, baseUrl);

        if (null != feignYcqhActionService) {
            log.info("feignYcqhActionService 创建成功！");
        } else {
            throw new RuntimeException("feignYcqhActionService 创建失败");
        }

        return feignYcqhActionService;
    }
}

3、编写Feign调用服务

import com.foresee.sznf.wxgzh.model.ycqh.*;
import feign.Param;
import feign.RequestLine;

import java.util.List;

/**
 * @author chenweifeng
 * @date 2019/11/13 10:59
 * 
 **/
public interface FeignYcqhActionService {

    /**
     * 获取列表
     *
     * @param id
     * @return
     */
    @RequestLine("GET /xxxxxxx?id={id}")
    YcqhActionReponse getList(@Param(value = "id") String id);
}

其中YcqhActionReponse是根据第三方接口返回的json去编写的，你也可以直接用JsonObject接收。

4、编写controller测试

import com.foresee.sznf.wxgzh.model.ycqh.*;
import com.foresee.sznf.wxgzh.service.FeignYcqhActionService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

/**
 * @author chenweifeng
 * @date 2019/11/13 15:04
 **/
@Controller
@RequestMapping("/test/ycqh")
public class FeginYcqhController {

    @Autowired
    private FeignYcqhActionService ycqhActionService;

    /**
     * 获取大厅
     *
     * @param organid
     * @return
     */
    @ResponseBody
    @RequestMapping(value = "/getList", method = RequestMethod.GET)
    public YcqhActionReponse getList(String id) {
        YcqhActionReponse ycqhActionReponse = ycqhActionService.getList(id);
        return ycqhActionReponse;
    }
}

好的，这样就可以实现http请求第三方接口了！