httpPost 请求

注:如果每次调用都要创建连接，则需要每次关闭连接

1. 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falsecon.setDoInput(true); //发送数据需要设置为true 默认falsecon.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;}}

2. 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;}

3. 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;}}