OkHttpClient發起http請求調用兩種方式：Feign和直接http調用

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import feign.Feign;
import feign.Headers;
import feign.Param;
import feign.RequestLine;
import feign.Retryer;
import feign.gson.GsonDecoder;
import feign.gson.GsonEncoder;
import feign.slf4j.Slf4jLogger;
import static java.util.concurrent.TimeUnit.SECONDS;
import javax.annotation.PostConstruct;
import lombok.extern.slf4j.Slf4j;
import okhttp3.OkHttpClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

@Slf4j
@Service
public class GlodonApiService {
	@Value("${glodon.config.appId}")
    private String appId;
    @Value("${glodon.config.secret}")
    private String secret;
    @Value("${glodon.config.serverUrl}")
    private String serverUrl;

	private Api api;
	@PostConstruct
    public void init() {
    OkHttpClient client = new OkHttpClient().newBuilder().build();
        client.dispatcher().setMaxRequests(100);
        client.dispatcher().setMaxRequestsPerHost(100);
         this.api = Feign.builder().logger(new Slf4jLogger()).logLevel(feign.Logger.Level.BASIC)
                .client(new feign.okhttp.OkHttpClient(client))
                .retryer(new Retryer.Default(1000, SECONDS.toMillis(1), 1)).encoder(new GsonEncoder())
                .decoder(new GsonDecoder()).target(Api.class, serverUrl);
    }
	public interface Api {
		@RequestLine("POST /trd/addVendor?appid={appId}&sign={sign}")
        @Headers("Content-Type: application/json;charset=UTF-8")
        GlodonApiRespVo addVendor(GlodonCorpInfoAddReq corpInfoAddReq,
                @Param("appId") String appId, @Param("sign") String sign);
	}
	public GlodonApiRespVo addVendor(GlodonCorpInfoAddReq corpInfoAddReq) {
	   // 加簽
        String sign = getSign(appId,secret,corpInfoAddReq);
        // 發起請求
        return api.addVendor(corpInfoAddReq,appId,sign);
	}
 }

另一種方式（非Feign調用）

 private static final OkHttpClient CLIENT = new OkHttpClient();
 private static String post(String data, String method) {
        try {
            MediaType MEDIA_TYPE_TEXT = MediaType.parse("application/json;charset=utf-8");
            System.out.println(generateParam(data));
            Request request = new Request.Builder().url(String.format(URL, method, generateParam(data))).post(RequestBody.create(MEDIA_TYPE_TEXT, data)).build();
            Response response = CLIENT.newCall(request).execute();
            return response.body().string();
        } catch (IOException e) {
            return null;
        }
    }
/**
     * 生成參數
     */
    public static String generateParam(String data) {
        return String.format("appid=%s&sign=%s", APP_ID, sign(APP_ID, SECRET, data));
    }

    /**
     * 簽名
     *
     * @param appId  賬號
     * @param secret 密鑰
     * @param data   json數據
     * @return MD5簽名字符串
     */
    public static String sign(String appId, String secret, String data) {
        if (StringUtils.isEmpty(data)) {
            data = "{}";
        }
        return DigestUtils.md5DigestAsHex(String.format("%sappid%sdata%s%s", secret, appId, data, secret).getBytes()).toUpperCase();
    }