public static String sendPost(String url, String param) {
      PrintWriter out = null;
      BufferedReader in = null;
      String result = "";
      try {
        URL realUrl = new URL(url);
        // 打開(kāi)和URL之間的連接
        URLConnection conn = realUrl.openConnection();
        // 設(shè)置通用的請(qǐng)求屬性
        conn.setRequestProperty("accept", "*/*");
        conn.setRequestProperty("connection", "Keep-Alive");
        conn.setRequestProperty("user-agent",
            "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        conn.setConnectTimeout(4000);
        conn.setReadTimeout(4000);
        // 發(fā)送POST請(qǐng)求必須設(shè)置如下兩行
        conn.setDoOutput(true);
        conn.setDoInput(true);
        // 獲取URLConnection對(duì)象對(duì)應(yīng)的輸出流
        out = new PrintWriter(conn.getOutputStream());
        // 發(fā)送請(qǐng)求參數(shù)
        out.print(param);
        // flush輸出流的緩沖
        out.flush();
        // 定義BufferedReader輸入流來(lái)讀取URL的響應(yīng)
        in = new BufferedReader(
            new InputStreamReader(conn.getInputStream()));
        String line;
        while ((line = in.readLine()) != null) {
          result += line;
        }
      } catch (Exception e) {
        System.out.println("發(fā)送 POST 請(qǐng)求出現(xiàn)異常！");
        //e.printStackTrace();
      }
      //使用finally塊來(lái)關(guān)閉輸出流、輸入流
      finally{
        try{
          if(out!=null){
            out.close();
          }
          if(in!=null){
            in.close();
          }
        }
        catch(IOException ex){
          //ex.printStackTrace();
        }
      }
      return result;
    }