向指定URL发送POST，GET请求

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   /**     * 向指定 URL 发送POST方法的请求     *      * @param url     *            发送请求的 URL     * @param param     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。     * @return 所代表远程资源的响应结果     */    public static String sendPost(String url, String param) {        PrintWriter out = null;        BufferedReader in = null;        String result = "";        try {            URL realUrl = new URL(url);            // 打开和URL之间的连接            URLConnection conn = realUrl.openConnection();            // 设置通用的请求属性            conn.setRequestProperty("accept", "*/*");            conn.setRequestProperty("connection", "Keep-Alive");            conn.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            // 发送POST请求必须设置如下两行            conn.setDoOutput(true);            conn.setDoInput(true);            // 获取URLConnection对象对应的输出流            out = new PrintWriter(conn.getOutputStream());            // 发送请求参数            out.print(param);            // flush输出流的缓冲            out.flush();            // 定义BufferedReader输入流来读取URL的响应            in = new BufferedReader(                    new InputStreamReader(conn.getInputStream(),"UTF-8"));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            System.out.println("发送 POST 请求出现异常！"+e);            e.printStackTrace();            return result;        }        //使用finally块来关闭输出流、输入流        finally{            try{                if(out!=null){                    out.close();                }                if(in!=null){                    in.close();                }            }            catch(IOException ex){                ex.printStackTrace();            }        }        return result;    }      /**     * post方法 参数为json对象     * @param url     * @param jsonParam 封装为json对象的参数；     * @return     */    public static String sendPost(String url,JSONObject jsonParam) {        try{               //创建连接               URL realUrl = new URL(url);               HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();               connection.setDoOutput(true);               connection.setDoInput(true);               connection.setRequestMethod("POST");               connection.setUseCaches(false);               connection.setInstanceFollowRedirects(true);               //connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");               connection.setRequestProperty("Content-Type","application/json; charset=UTF-8");                      connection.connect();//               POST请求               DataOutputStream out = new DataOutputStream(connection.getOutputStream());                         //out.writeBytes(obj.toString());//这个中文会乱码               out.write(jsonParam.toString().getBytes("UTF-8"));//这样可以处理中文乱码问题               out.flush();               out.close();               //读取响应               BufferedReader reader = new BufferedReader(new InputStreamReader(                       connection.getInputStream()));               String lines;               StringBuffer sb = new StringBuffer("");               while ((lines = reader.readLine()) != null) {                   lines = new String(lines.getBytes(), "utf-8");                   sb.append(lines);               }               System.out.println(sb);               reader.close();               // 断开连接               connection.disconnect();               return sb.toString();           } catch (MalformedURLException e) {               // TODO Auto-generated catch block               e.printStackTrace();               return HttpUtils.Error_perfix+"url解析异常！";           } catch (UnsupportedEncodingException e) {               // TODO Auto-generated catch block               e.printStackTrace();               return HttpUtils.Error_perfix+"不支持的编码格式！";           } catch (IOException e) {               // TODO Auto-generated catch block               e.printStackTrace();               return HttpUtils.Error_perfix+"服务端异常！";           }       }
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