String addSerial = HttpUtil.doHttpGet(getUrl()+"/txSns/tx/getAddSerial.do");

//獲取配置檔案中的介面地址
    private String getUrl() {
        Properties prop = new Properties();
        String messageUrl="";
        URL settingsUrl =getClass().getClassLoader().getResource("/config/sysconfig/sysconfig.properties");
        
 
try(InputStream in =settingsUrl.openStream();) {
            prop.load(in);
            messageUrl = prop.getProperty("message.url").trim();
            IOUtils.closeQuietly(in);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return messageUrl;
    }

package com.ustc.base.common.util;

 
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
 
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;
import net.minidev.json.JSONObject;

/**
 * 網路請求工具類
 * 
 */
public class HttpUtil {

    private static final Logger logger = Logger.getLogger(HttpUtil.class);
    private static final Integer SUCCESS = 200;
    private static final String UTF = "UTF-8";

    /**
     * Http Get 請求
     * 
     * @param requestUrl 請求地址
     * @return 伺服器返回資訊
     * @throws Exception
     */
    public static String doHttpGet(String requestUrl) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(requestUrl);
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(3000).build();// 設定響應超時時間和連線超時
        httpGet.setConfig(requestConfig);
        CloseableHttpResponse response = null;
        String result = null;
        try {
            response = httpClient.execute(httpGet);
            result = EntityUtils.toString(response.getEntity());

            if (response.getStatusLine().getStatusCode() == HttpUtil.SUCCESS) {// 請求成功
                return result;
            } else {// 請求失敗
                throw new Exception("請求成功");
            }
        } catch (Exception e) {
            logger.error("系統異常", e);
            logger.error(result);
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    logger.error("系統異常", e);
                }
            }
        }

        return result;
    }

    /**
     * Http Get 請求
     * 
     * @param requestUrl 請求地址
     * @return 伺服器返回資訊
     * @throws Exception
     */
    public static String doHttpGet(String requestUrl, String sign, String appCode, String timestamp) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(requestUrl);
        httpGet.addHeader("sign", sign);
        httpGet.addHeader("appCode", appCode);
        httpGet.addHeader("timestamp", timestamp);
        CloseableHttpResponse response = null;
        String result = null;
        try {
            response = httpClient.execute(httpGet);
            result = EntityUtils.toString(response.getEntity());

            if (response.getStatusLine().getStatusCode() == HttpUtil.SUCCESS) {// 請求成功
                return result;
            } else {// 請求失敗
                throw new Exception("請求成功");
            }
        } catch (Exception e) {
            logger.error("系統異常", e);
            logger.error(result);
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    logger.error("系統異常", e);
                }
            }
        }

        return result;
    }

    /**
     * Http Post 請求
     * 
     * @param requestUrl 請求地址
     * @param params     請求引數
     * @return 伺服器返回資訊
     */
    public static String doHttpPost(String requestUrl, Map<String, String> params) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(requestUrl);
        CloseableHttpResponse response = null;
        String result = null;
        try {
            // 設定請求引數
            if (params != null && !params.isEmpty()) {
                List<NameValuePair> pairList = new ArrayList<NameValuePair>();
                for (Entry<String, String> entry : params.entrySet()) {
                    pairList.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
                }
                httpPost.setEntity(new UrlEncodedFormEntity(pairList, HttpUtil.UTF));
            }
            response = httpClient.execute(httpPost);
            result = EntityUtils.toString(response.getEntity(), UTF);

            if (response.getStatusLine().getStatusCode() == HttpUtil.SUCCESS) {// 請求成功
                return result;
            } else {// 請求失敗
                throw new Exception("請求失敗");
            }
        } catch (Exception e) {
            logger.error("系統異常", e);
            logger.error(result);
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    logger.error("系統異常", e);
                }
            }
        }
        return result;
    }

    /**
     * @param requestUrl 請求地址
     * @param json       請求引數
     * @return 伺服器返回資訊
     */
    public static String doHttpPost(String requestUrl, JSONObject json) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(requestUrl);
        CloseableHttpResponse response = null;
        String result = null;

        try {
            // 設定請求引數
            if (json != null) {
                StringEntity entity = new StringEntity(json.toString(), UTF);
                entity.setContentEncoding(UTF);
                entity.setContentType("application/json");
                httpPost.setEntity(entity);
            }

            response = httpClient.execute(httpPost);
            result = EntityUtils.toString(response.getEntity(), UTF);

            if (response.getStatusLine().getStatusCode() == HttpUtil.SUCCESS) {// 請求成功
                return result;
            } else {// 請求失敗
                throw new Exception("請求失敗");
            }
        } catch (Exception e) {
            logger.error("系統異常", e);
            logger.error(result);
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    logger.error("系統異常", e);
                }
            }
        }

        return result;
    }

    
}