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import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.HttpURLConnection;import java.net.URL;public class HttpPost {  /**   * 發(fā)送 post 請求   * @param uri 請求的 url   * @param param 請求的 參數(shù)，以"a=1&b=2" 的格式   * @param charset 編碼。英文編碼："utf-8"，中文編碼："gbk"   * @return   */  public static String sendPost(String uri, String param, String charset) {    String result = null;    PrintWriter out = null;    InputStream in = null;    try {      URL url = new URL(uri);      HttpURLConnection urlcon = (HttpURLConnection) url.openConnection();      urlcon.setDoInput(true);      urlcon.setDoOutput(true);      urlcon.setUseCaches(false);      urlcon.setRequestMethod("POST");      urlcon.connect();// 獲取連接      out = new PrintWriter(urlcon.getOutputStream());      out.print(param);      out.flush();      in = urlcon.getInputStream();      BufferedReader buffer = new BufferedReader(new InputStreamReader(          in, charset));      StringBuffer bs = new StringBuffer();      String line = null;      while ((line = buffer.readLine()) != null) {        bs.append(line);      }      result = bs.toString();    } catch (Exception e) {      System.out.println("[請求異常][地址：" + uri + "][參數(shù)：" + param + "][錯(cuò)誤信息："          + e.getMessage() + "]");    } finally {      try {        if (null != in) {          in.close();        }        if (null != out) {          out.close();        }      } catch (Exception e2) {        System.out.println("[關(guān)閉流異常][錯(cuò)誤信息：" + e2.getMessage() + "]");      }    }    return result;  }  public static void main(String[] args) {    String url = "http://mis.teach.ustc.edu.cn/kbcx.do";    String result = sendPost(url, "xq=20181&xklb=b&cxfs=0", "gbk");    System.out.println(result);  }}