說明：

引數1：http請求的訪問路徑

引數2：請求方式 post get patch delete

引數3：請求內容，xml或json格式的報文，字串都可以

附程式碼：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * restful介面呼叫工具
 */
public class RestfulUtil {

   /**
 
    * 連線hlfront
    * @param url：
    * @param param：請求方式
    * @param message：報文
    * @return
*/
public static String dealCon(String url, String param, String message) throws IOException {
      param = param.toUpperCase();// POST DELETE PATCH GET
StringBuffer result = new StringBuffer();//返回
URL restServiceURL = new 
 
URL(url);
      HttpURLConnection httpConnection = (HttpURLConnection) restServiceURL.openConnection();
      httpConnection.setDoOutput(true);//允許輸出
httpConnection.setDoInput(true);//允許輸入
httpConnection.setUseCaches(false);//不用快取
httpConnection.setRequestMethod(param);
      httpConnection.setRequestProperty("Charset"
 
, "UTF-8");
      httpConnection.setRequestProperty("Accept", "application/json");
//       httpConnection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + UUID.randomUUID().toString());
if("POST".equals(param)){
         //傳遞引數
//       String input = URLEncoder.encode(message, "UTF-8");
String input = message;
         OutputStream outputStream = httpConnection.getOutputStream();
         outputStream.write(input.getBytes());
         outputStream.flush();
      }
      if (httpConnection.getResponseCode() != 200) {
         throw new RuntimeException(
               "HTTP "+ param +" Request Failed with Error code : "
+ httpConnection.getResponseCode());
      }
      BufferedReader responseBuffer = new BufferedReader(
            new InputStreamReader((httpConnection.getInputStream())));

      String output = "";
      while ((output = responseBuffer.readLine()) != null) {
         result.append(output);
      }
      httpConnection.disconnect();
      return result.toString();
   }

}