Java代码发送post请求实现方式

/*
 * 利用HttpClient进行post请求的工具类
 */
public class HttpClientUtil {
    public String doPost(String url, Map<String, String> headerMap, String jsonText, String charset) {
        HttpClient httpClient = null;
        HttpPost httpPost = null;
        String result = null;
        InputStream in = null;
        try {
            httpClient = SSLClientFactory.createSSLClientDefault();
            httpPost = new HttpPost(url);
            // 设置参数
            Iterator<Entry<String, String>> iterator = headerMap.entrySet().iterator();
            Entry<String, String> elem = null;
            while (iterator.hasNext()) {
                elem = iterator.next();
                httpPost.addHeader(elem.getKey(), elem.getValue());
            }
            if (StringUtils.isNotBlank(jsonText)) {
                byte[] bytes = jsonText.getBytes(HTTP.UTF_8);
                ByteArrayEntity se = new ByteArrayEntity(bytes);
                httpPost.setEntity(se);
            }
            HttpResponse response = httpClient.execute(httpPost);
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    in=resEntity.getContent();
                    result = EntityUtils.toString(resEntity, charset);
                }
            }
        } catch (Exception ex) {
        }
        finally
        {
            if (in != null){
                try
                {
                    in.close ();
                }
                catch (IOException e)
                {
                    e.printStackTrace ();
                }
            }
        }
        return result;
    }
}

        //获取接口地址
        String url="http://external.rmcp-zsh.bosafe.com/api/v1/ztexternal/user/change";
        //获取请求头
        Map<String, String> headerMap = new HashMap<String, String>();
        headerMap.put("appId", appId);
        headerMap.put("randomNumber",s);
        headerMap.put("timestamp", strTime);
        headerMap.put("signature", w );
        headerMap.put("Content-Type", "application/json");
        //获取请求体
        JSONObject obj = new JSONObject();
        obj.put("appId", appId);
        //将待同步对象集合转换为json数据
        JSONArray userList = JSONUtil.parseArray(split);
        //设置请求体参数
        obj.put("userList",userList);

HttpClientUtil httpClientUtil = new HttpClientUtil();
//发送post请求
String results = httpClientUtil.doPost(url, headerMap, obj.toJSONString(), Constants.UTF8);
//返回结果
JSONObject resultJson = JSONObject.parseObject(results);
String status =resultJson.getString("status");