java发一个http请求过去，带上参数就可以了，跟我们在浏览器上访问资源是一样的 只是它返回的是json格式的数据而已。
比如以下有两个方法：
public static String do_post(String url, List<NameValuePair> name_value_pair) throws IOException { String body = "{}"; DefaultHttpClient httpclient = new DefaultHttpClient(); try { HttpPost httpost = new HttpPost(url); httpost.setEntity(new UrlEncodedFormEntity(name_value_pair, StandardCharsets.UTF_8)); HttpResponse response = httpclient.execute(httpost); HttpEntity entity = response.getEntity(); body = EntityUtils.toString(entity); } finally { httpclient.getConnectionManager().shutdown(); } return body; } public static String do_get(String url) throws ClientProtocolException, IOException { String body = "{}"; DefaultHttpClient httpclient = new DefaultHttpClient(); try { HttpGet httpget = new HttpGet(url); HttpResponse response = httpclient.execute(httpget); HttpEntity entity = response.getEntity(); body = EntityUtils.toString(entity); } finally { httpclient.getConnectionManager().shutdown(); } return body; }摘自：https://zhidao.baidu.com/question/1672455249235897907.html
