JAVA利用HttpClient进行POST请求（HTTPS）

     final HttpClientUtil httpClientUtil = new HttpClientUtil();
        final Map<String, String> map = Maps.newHashMap();
        map.put("username", workNo);
        map.put("password", passwd);
        final String resultStr = httpClientUtil.doPost(url, map, CHARSET);

/*
 * 利用HttpClient进行post请求的工具类
 */

/*
 * 利用HttpClient进行post请求的工具类
 */
public class HttpClientUtil {

    public String doPost(String url,Map<String,String> map,String charset){
        HttpClient httpClient = null;
        HttpPost httpPost = null;
        String result = null;
        try{
            httpClient = new SSLClient();
            httpPost = new HttpPost(url);
            //设置参数
            final List<NameValuePair> list = new ArrayList<>();
            final Iterator iterator = map.entrySet().iterator();
            while(iterator.hasNext()){
                final Entry<String,String> elem = (Entry<String, String>) iterator.next();
                list.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));
            }
            if(!list.isEmpty()){
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);
                httpPost.setEntity(entity);
            }
            HttpResponse response = httpClient.execute(httpPost);
            if(response != null){
                final HttpEntity resEntity = response.getEntity();
                if(resEntity != null){
                    result = EntityUtils.toString(resEntity,charset);
                }
            }
        }catch(Exception ex){
            ex.printStackTrace();
        }

        return result;
    }


    /**
     * 发送get请求
     * @param url       链接地址
     * @param charset   字符编码，若为null则默认utf-8
     * @return
     */
    public String doGet(String url,String charset){
        if(null == charset){
            charset = "utf-8";
        }
        HttpClient httpClient = null;
        HttpGet httpGet= null;
        String result = null;

        try {
            httpClient = new SSLClient();
            httpGet = new HttpGet(url);

            final HttpResponse response = httpClient.execute(httpGet);
            if(response != null){
                final HttpEntity resEntity = response.getEntity();
                if(resEntity != null){
                    result = EntityUtils.toString(resEntity,charset);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return result;
    }
}