1、加入依赖

    <dependency>
            <groupId>com.squareup.okhttp3</groupId>
            <artifactId>okhttp</artifactId>
            <version>3.10.0</version>
    </dependency>

2、configuration

@Configuration
public class OKHttpConfig {
    @Bean
    public OkHttpClient okHttpClient() {
        return new OkHttpClient().newBuilder().retryOnConnectionFailure(false).connectionPool(pool())
                .connectTimeout(5, TimeUnit.SECONDS).readTimeout(5, TimeUnit.SECONDS).writeTimeout(5, TimeUnit.SECONDS)
                .build();

    }

    @Bean
    public ConnectionPool pool() {
        return new ConnectionPool(50, 5, TimeUnit.MINUTES);
    }
}

3、util 工具类

@Slf4j
@Component
public class OKHttpUtil {

    private static OkHttpClient okHttpClient;

    @Autowired
    public OKHttpUtil(OkHttpClient okHttpClient) {
        OKHttpUtil.okHttpClient = okHttpClient;
    }

    /**
     * get
     * 
     * @param url 请求的url
     * @param queries 请求的参数，在浏览器？后面的数据，没有可以传null
     * @return
     */
    public static String get(String url, Map<String, String> queries) {
        String responseBody = "";
        StringBuffer sb = new StringBuffer(url);
        if (MapUtils.isNotEmpty(queries)) {
            boolean firstFlag = true;
            Iterator iterator = queries.entrySet().iterator();
            while (iterator.hasNext()) {
                Map.Entry entry = (Map.Entry<String, String>) iterator.next();
                if (firstFlag) {
                    sb.append("?" + entry.getKey() + "=" + entry.getValue());
                    firstFlag = false;
                } else {
                    sb.append("&" + entry.getKey() + "=" + entry.getValue());
                }
            }
        }
        Request request = new Request.Builder().url(sb.toString()).build();
        Response response = null;
        try {
            response = okHttpClient.newCall(request).execute();
            //int status = response.code();
            if (response.isSuccessful()) {
                return response.body().string();
            }
        } catch (Exception e) {
            log.error("okhttp3 put error >> ex = {}", e);
        } finally {
            if (response != null) {
                response.close();
            }
        }
        return responseBody;
    }

    /**
     * Post请求发送JSON数据....{"name":"zhangsan","pwd":"123456"} 参数一：请求Url 参数二：请求的JSON
     * 参数三：请求回调
     */
    public static String postJsonParams(String url, String jsonParams) {
        String responseBody = "";
        RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams);
        Request request = new Request.Builder().url(url).post(requestBody).build();
        Response response = null;
        try {
            response = okHttpClient.newCall(request).execute();
            //            int status = response.code();
            if (response.isSuccessful()) {
                return response.body().string();
            }
        } catch (Exception e) {
            log.error("okhttp3 post error >> ex = {}", e);
        } finally {
            if (response != null) {
                response.close();
            }
        }
        return responseBody;
    }

}

参考git 地址：https://github.com/shihongwei/okhttp-demo.git