HttpClient httpClient=new DefaultHttpClient(); --> CloseableHttpClient httpClient = HttpClients.createDefault();

HttpResponse --> CloseableHttpResponse

HttpResponse httpResponse = httpClient.execute(httpPost); --> CloseableHttpResponse httpResponse = httpClient.execute(httpPost);

/**
     * Post方式 得到JSONObject
     *
     * @param paramsHashMap post参数
     * @param url
     * @param encoding 编码utf-8
     * @return
     */
    public JSONObject getJSONObjectByPost(Map<String, String> paramsHashMap, String url, String encoding) {
        //创建httpClient连接
        CloseableHttpClient httpClient = HttpClients.createDefault();

        JSONObject result = null;
        List<NameValuePair> nameValuePairArrayList = new ArrayList<NameValuePair>();
        // 将传过来的参数添加到List<NameValuePair>中
        if (paramsHashMap != null && !paramsHashMap.isEmpty()) {
            //遍历map
            for (Map.Entry<String, String> entry : paramsHashMap.entrySet()) {
                nameValuePairArrayList.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
        }
        UrlEncodedFormEntity entity = null;
        try {
            // 利用List<NameValuePair>生成Post请求的实体数据
            // UrlEncodedFormEntity 把输入数据编码成合适的内容
            entity = new UrlEncodedFormEntity(nameValuePairArrayList, encoding);
            HttpPost httpPost = new HttpPost(url);
            // 为HttpPost设置实体数据
            httpPost.setEntity(entity);
            // HttpClient 发送Post请求
            CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
            if (httpResponse.getStatusLine().getStatusCode() == 200) {
                // CloseableHttpResponse
                HttpEntity httpEntity = httpResponse.getEntity();
                if (httpEntity != null) {
                    BufferedReader reader = null;
                    try {
                        reader = new BufferedReader(new InputStreamReader(httpEntity.getContent(), "UTF-8"), 10 * 1024);
                        StringBuilder strBuilder = new StringBuilder();
                        String line = null;
                        while ((line = reader.readLine()) != null) {
                            strBuilder.append(line);
                        }
                        // 用fastjson的JSON将返回json字符串转为json对象
                        result = JSON.parseObject(strBuilder.toString());
                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        if (reader != null) {
                            try {
                                //关闭流
                                reader.close();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }