调用第三方请求获取数据

public String sendGetRequest(String reqURL, Map paramMap, String decodeCharset){
    // 创建Httpclient对象
    CloseableHttpClient httpclient = HttpClients.createDefault();

    String resultString = "";
    CloseableHttpResponse response = null;

    //处理URL的一些传参
    if (!paramMap.isEmpty()) {
        for (String key : paramMap.keySet()) {
            if (reqURL.indexOf('?') == -1) {
                reqURL += "?" + key + "=" + paramMap.get(key);
            } else {
                reqURL += "&" + key + "=" + paramMap.get(key);
            }
        }
    }

    try {

        HttpGet httpGet = new HttpGet(reqURL);

        // 执行请求
        response = httpclient.execute(httpGet);
        response.setHeader("Content-Type", "application/json");

        // 判断返回状态是否为200
        if (response.getStatusLine().getStatusCode() == 200) {
            resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (response != null) {
                response.close();
            }
            httpclient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return resultString;
}