java 使用OKHTTP（POST、GET）请求

需要的包
        <dependency>
            <groupId>com.squareup.okhttp3</groupId>
            <artifactId>okhttp</artifactId>
            <version>4.9.1</version>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib</artifactId>
            <version>1.3.61</version>
        </dependency>

 private static final OkHttpClient OKHTTP_CLIENT = new OkHttpClient.Builder()
            .connectTimeout(120, TimeUnit.SECONDS)
            .readTimeout(120,TimeUnit.SECONDS)
            .writeTimeout(120,TimeUnit.SECONDS)
            .build();

    private static final MediaType MEDIA_TYPE = MediaType.get("application/json; charset=utf-8");
/**
     * OKHTTP  POST 请求
     * @param reqUrl  地址
     * @param header 头部信息
     * @param jsonObject 请求参数
     * @return
     */
    public static String okHttpPost(String reqUrl , Map<String,String> header, JSONObject jsonObject){
        RequestBody body = RequestBody.create(MEDIA_TYPE,jsonObject.toString());
        // 添加头部信息
        Request.Builder builder = new Request.Builder().url(reqUrl);
        if(header!=null && !header.isEmpty()) {
            header.entrySet().forEach(res -> {
                builder.addHeader(res.getKey(), res.getValue());
            });
        }
        // 发送请求
        Request request = builder.post(body).build();
        try{
            Response response = OKHTTP_CLIENT.newCall(request).execute();
            return response.body().string();
        }catch (Exception e){
            throw  new RuntimeException("HTTP POST同步请求失败 URL:"+reqUrl,e);
        }
    }

    /**
     * OKHTTP GET 请求
     * @param reqUrl 地址
     * @param params 参数
     * @param flag 地址中带有参数为 TRUE 没有参数 FALSE
     * @return
     */
    public static String okHttpGet(String reqUrl , Map<String,String> params,boolean flag){
        StringBuilder stringBuilder = new StringBuilder();
            //处理参数
        if(params!=null && !params.isEmpty()) {
            params.keySet().forEach(res -> {
                if (StringUtils.isNotBlank(stringBuilder) || flag) {
                    stringBuilder.append("&");
                } else {
                    stringBuilder.append("?");
                }
                try {
                    stringBuilder.append(String.format("%s=%s", res, URLEncoder.encode(params.get(res), "UTF-8")));
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }

            });
        }
            // 拼接参数
            String requestUrl = reqUrl+stringBuilder;
            // 发送请求
            Request request = new Request.Builder()
                    .url(requestUrl)
                    .build();
            try{
                Response response = OKHTTP_CLIENT.newCall(request).execute();
                return response.body().string();
            }catch (Exception e){
                throw  new RuntimeException("HTTP GET同步请求失败 URL:"+reqUrl,e);
            }
    }