发送POST请求（HTTP），K-V形式

/**

     * 发送POST请求（HTTP），K-V形式

     * @param url

     * @param params

     * @author Charlie.chen

     * @return

     */

    public static String doPost(String url, Map<string, string=""> params) {

 

        // 创建默认的HttpClient实例.

        CloseableHttpClient httpclient = HttpClients.createDefault();

        try {

 

            // 定义一个get请求方法

            HttpPost httppost = new HttpPost(url);

 

            // List<namevaluepair> parameters = new ArrayList<namevaluepair>();

            // parameters.add(new BasicNameValuePair("username", userName));

            // parameters.add(new BasicNameValuePair("password", password));

 

            // 定义post请求的参数

            // 建立一个NameValuePair数组，用于存储欲传送的参数

            List<namevaluepair> list = new ArrayList<namevaluepair>();

            Iterator iterator = params.entrySet().iterator();

            while (iterator.hasNext()) {

                Entry<string, string=""> elem = (Entry<string, string="">) iterator.next();

                list.add(new BasicNameValuePair(elem.getKey(), elem.getValue()));

            }

            if (list.size() > 0) {

                httppost.setEntity(new UrlEncodedFormEntity(list, "utf-8"));

            }

 

 

            // httppost.setHeader("Content-type","application/json,charset=utf-8");

            // httppost.setHeader("Accept", "application/json");

 

 

            // 执行post请求，返回response服务器响应对象, 其中包含了状态信息和服务器返回的数据

            CloseableHttpResponse httpResponse = httpclient.execute(httppost);

 

            // 使用响应对象, 获得状态码, 处理内容

            int statusCode = httpResponse.getStatusLine().getStatusCode();

            if (statusCode == 200) {

                // 使用响应对象获取响应实体

                HttpEntity entity = httpResponse.getEntity();

                // 将响应实体转为字符串

                String response = EntityUtils.toString(entity, "utf-8");

                return response;

 

            } else {

                // log.error("访问失败"+statusCode);

            }

 

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            try {

                // 关闭连接, 和释放资源

                httpclient.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

        return null;

    }

 

 

转载：https://www.2cto.com/kf/201611/561147.html