public void testSaveVideoExam() throws Exception {
String url = "https://api.polyv.net/v2/video/save-video-exam";
Map<String, String> params = new HashMap<>();
params.put("userid", userid);
params.put("vid", "a2dc4f25172872650e7d5c1b8026b13c_a");
params.put("examId", "179228dfe4f");
params.put("question", "测试问题");
params.put("showTime", "12");
params.put("choices", "[{\"index\":0,\"content\":\"a\",\"isRight\":true},{\"index\":1,\"content\":\"b\",\"isRight\":false},{\"index\":2,\"content\":\"c\",\"isRight\":false},{\"index\":3,\"content\":\"d\",\"isRight\":true}]");
params.put("canSkip", "false");
params.put("explanationIfRight", "回答正确后的解答详情");
params.put("showExplanationIfWrong", "true");
params.put("explanationIfWrong", "回答错误后的解答详情");
params.put("backTime", "1");
params.put("ptime", String.valueOf(System.currentTimeMillis()));
params.put("sign", getSign(params, secretkey));
String response = HttpClientUtil.getInstance().sendHttpPost(url, params);
System.out.println(response);
}