一：

用java自带URL发送

public synchronized JSONObject getJSON(String url2, String param) {

           try {

                URL url = new URL(url2);

                HttpURLConnection con = (HttpURLConnection) url.openConnection();

                con.setDoOutput(true); //获取返回数据需要设置为true 默认false

                con.setDoInput(true); //发送数据需要设置为true 默认false

                con.setReadTimeout(5000);

                con.setConnectTimeout(5000);

                con.setRequestMethod("POST");

                con.connect();

                DataOutputStream out = new DataOutputStream(con.getOutputStream());

                if (param != null) {

                     param = URLEncoder.encode(param,"utf-8");//url编码防止中文乱码

                     out.writeBytes(param);

                }

                out.flush();

                out.close();

                BufferedReader red = new BufferedReader(new InputStreamReader(con.getInputStream(), "utf-8"));

                StringBuffer sb = new StringBuffer();

                String line;

                while ((line = red.readLine()) != null) {

                     sb.append(line);

                }

                red.close();

                return JSONObject.fromObject(sb);

           } catch (Exception e) {

                e.printStackTrace();

                return null;

           }

     }

二:apache httppost方式

/**

      * post请求,发送json数据

      *

      * @param url

      * @param json

      * @return

      */

     public static JSONObject doPost(String url, String json) {

           HttpPost post = new HttpPost(url);

           JSONObject response = null;

           try {

                StringEntity s = new StringEntity(json, "UTF-8"); // 中文乱码在此解决

                s.setContentType("application/json");

                post.setEntity(s);

                HttpResponse res = HttpClients.createDefault().execute(post);

                if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

                     String result = EntityUtils.toString(res.getEntity());// 返回json格式：

                     response = JSON.parseObject(result);

                }

           } catch (Exception e) {

                e.printStackTrace();

           }

           return response;

     }

三: httppost 发送map

   /**

      * post请求

      *

      * @param url

      * @param param

      * @return

      */

     public static String httpPost(String url, Map<String, Object> map) {

           try {

                HttpPost post = new HttpPost(url);

　　　　　　　　//requestConfig post请求配置类，设置超时时间

                RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(5000).setSocketTimeout(50000).build();

                post.setConfig(requestConfig);

                List<NameValuePair> params = new ArrayList<NameValuePair>();

                for (Map.Entry<String, Object> entry : map.entrySet()) {

                     if (entry.getValue() != null && entry.getValue() != "") {

　　　　　　　　　　　　　　//用basicNameValuePair来封装数据

                           params.add(new BasicNameValuePair(entry.getKey(), entry.getValue() + ""));

                     }

                }

　　　　　　　　　　//在这个地方设置编码 防止请求乱码

                post.setEntity(new UrlEncodedFormEntity(params, "utf-8"));

                GeneralLog.info(ModelName, "请求url:" + url);

                GeneralLog.info(ModelName, "请求数据:" + map);

                CloseableHttpResponse httpResponse = HttpClients.createDefault().execute(post);

                System.out.println("返回数据：" + httpResponse);

                String result = null;

                if (httpResponse.getStatusLine().getStatusCode() == 200) {

                     HttpEntity httpEntity = httpResponse.getEntity();

                     result = EntityUtils.toString(httpEntity);// 取出应答字符串

                }

                return result;

           } catch (Exception e) {

                e.printStackTrace();

                return null;

           }

     }