/**
 * @Description Http|Https 请求工具类
 * @Author blake
 * @Date 2018/12/12 下午4:33
 * @Version 1.0
 */
public class HttpUtils {

    private static PoolingHttpClientConnectionManager connMgr;
    private static RequestConfig requestConfig;
    private static final int MAX_TIMEOUT = 7000;

    static {

        // 设置连接池
        connMgr = new PoolingHttpClientConnectionManager();

        // 设置连接池大小
        connMgr.setMaxTotal(100);
        connMgr.setDefaultMaxPerRoute(connMgr.getMaxTotal());

        RequestConfig.Builder configBuilder = RequestConfig.custom();

        // 设置连接超时
        configBuilder.setConnectTimeout(MAX_TIMEOUT);

        // 设置读取超时
        configBuilder.setSocketTimeout(MAX_TIMEOUT);

        // 设置从连接池获取连接实例的超时
        configBuilder.setConnectionRequestTimeout(MAX_TIMEOUT);

        // 在提交请求之前 测试连接是否可用
        connMgr.setValidateAfterInactivity(5000);
        // configBuilder.setStaleConnectionCheckEnabled(true);

        requestConfig = configBuilder.build();
    }

    /**
     * 发送 GET 请求（HTTP），不带参数
     *
     * @param url
     * @return
     */
    public static String doGet(String url) {
        return doGet(url, new HashMap<>());
    }

    /**
     * 发送 GET 请求（HTTP），传入参数为 Key-Value 形式
     *
     * @param url
     * @param params
     * @return
     */
    public static String doGet(String url, Map<String, Object> params) {
        String apiUrl = url;
        StringBuffer param = new StringBuffer();
        int i = 0;
        for (String key : params.keySet()) {
            if (i == 0)
                param.append("?");
            else
                param.append("&");
            param.append(key).append("=").append(params.get(key));
            i++;
        }
        apiUrl += param;
        String result = null;
        HttpClient httpclient = HttpClientBuilder.create().build();
        try {
            HttpGet httpPost = new HttpGet(apiUrl);
            HttpResponse response = httpclient.execute(httpPost);
            int statusCode = response.getStatusLine().getStatusCode();

            System.out.println("执行状态码 : " + statusCode);

            HttpEntity entity = response.getEntity();
            if (entity != null) {
                InputStream inStream = entity.getContent();
                result = IOUtils.toString(inStream, "UTF-8");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 发送 POST 请求（HTTP），不带参数
     *
     * @param apiUrl
     * @return
     */
    public static String doPost(String apiUrl) {
        return doPost(apiUrl, new HashMap<>());
    }

    /**
     * 发送 POST 请求（HTTP），参数为 Key-Value 形式
     *
     * @param apiUrl API接口URL
     * @param params 参数map
     * @return
     */
    public static String doPost(String apiUrl, Map<String, Object> params) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        String httpStr = null;
        HttpPost httpPost = new HttpPost(apiUrl);
        CloseableHttpResponse response = null;

        try {
            httpPost.setConfig(requestConfig);
            List<NameValuePair> pairList = new ArrayList<>(params.size());
            for (Map.Entry<String, Object> entry : params.entrySet()) {
                NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry
                        .getValue().toString());
                pairList.add(pair);
            }
            httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("UTF-8")));
            response = httpClient.execute(httpPost);
            System.out.println(response.toString());
            HttpEntity entity = response.getEntity();
            httpStr = EntityUtils.toString(entity, "UTF-8");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (response != null) {
                try {
                    EntityUtils.consume(response.getEntity());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return httpStr;
    }

    /**
     * 发送 POST 请求（HTTP），参数为JSON形式
     *
     * @param apiUrl
     * @param json   json对象
     * @return
     */
    public static String doPost(String apiUrl, Object json) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        String httpStr = null;
        HttpPost httpPost = new HttpPost(apiUrl);
        CloseableHttpResponse response = null;

        try {
            httpPost.setConfig(requestConfig);
            StringEntity stringEntity = new StringEntity(json.toString(), "UTF-8");
            stringEntity.setContentEncoding("UTF-8");
            stringEntity.setContentType("application/json");
            httpPost.setEntity(stringEntity);
            response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            System.out.println(response.getStatusLine().getStatusCode());
            httpStr = EntityUtils.toString(entity, "UTF-8");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (response != null) {
                try {
                    EntityUtils.consume(response.getEntity());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return httpStr;
    }