@SuppressWarnings("unchecked")
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 0.init
String captchaURL = null;
String captchaImage = null;
BasicCookieStore cookieStore = new BasicCookieStore();
// CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpClient httpClient =
HttpClients.custom().setDefaultCookieStore(cookieStore).build();
// 1.Send Get request header to server.
// Get the response Html page.
System.out.println("==========Send Request to e-can server==========");
HttpGet httpGet = new HttpGet("https://www.e-can.com.tw/reservationUNMember_online.aspx");
httpGet.addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
httpGet.addHeader("Accept-Encoding", "gzip, deflate");
httpGet.addHeader("Accept-Language", "zh-TW,zh;q=0.8,en-US;q=0.5,en;q=0.3");
httpGet.addHeader("Connection", "Keep-Alive");
httpGet.addHeader("Host", "www.e-can.com.tw");
httpGet.addHeader("User-Agent", "Mozilla");
CloseableHttpResponse resp = httpClient.execute(httpGet);
System.out.println();
// show server response status > GET 200 OK
System.out.println(resp.getStatusLine());
for (Header h : resp.getAllHeaders()) {
System.out.println(h);
}
System.out.println("**********End of Headers********** \n\n");
HttpEntity entity = resp.getEntity();
// show entity
// System.out.println("entity="+entity);
String html = EntityUtils.toString(resp.getEntity());
// show html page
// System.out.println(html);
// 2.Use Jsoup to parse html page.
// Select cssString to get captchaURL and captchaKey source.
Document htmlDoc = Jsoup.parse(html);
Elements elementEventTarget = htmlDoc.select("#__EVENTTARGET");
Elements elementEventArgument = htmlDoc.select("#__EVENTARGUMENT");
Elements elementViewState = htmlDoc.select("#__VIEWSTATE");
Elements elementViewStateGenerrator = htmlDoc.select("#__VIEWSTATEGENERATOR");
Elements elementddlGetdate = htmlDoc.select("#ddlGetdate > option");
// info for post later
String __EVENTTARGET = elementEventTarget.val();
String __EVENTARGUMENT = elementEventArgument.val();
String __VIEWSTATE = elementViewState.val();
String __VIEWSTATEGENERATOR = elementViewStateGenerrator.val();
int count = 0;
JSONObject joOption = new JSONObject();
for (Element e : elementddlGetdate) {
joOption.put(count++, e.toString());
}
System.out.println("joOption = " + joOption);
Elements elementCaptcha = htmlDoc.select("#captcha");
System.out.println(elementCaptcha.attr("src"));
captchaURL = "https://www.e-can.com.tw/" + elementCaptcha.attr("src");
// show URL
System.out.println("captchaURL=" + captchaURL);
// 3.Send GET request to get the captchaImage source.
// Encode source to base64 String.
System.out.println("==========Send request to e-can for captcha image==========");
httpGet = new HttpGet(captchaURL);
httpGet.addHeader("Referer", "https://www.e-can.com.tw/reservationUNMember_online.aspx");
httpGet.addHeader("Accept", "image/png,image/*;q=0.8,*/*;q=0.5");
httpGet.addHeader("Accept-Encoding", "gzip, deflate");
httpGet.addHeader("Accept-Language", "zh-TW,zh;q=0.8,en-US;q=0.5,en;q=0.3");
httpGet.addHeader("Connection", "Keep-Alive");
httpGet.addHeader("Host", "www.e-can.com.tw");
httpGet.addHeader("User-Agent", "Mozilla");
resp = httpClient.execute(httpGet);
System.out.println();
List<Cookie> cookies = cookieStore.getCookies();
if (cookies.isEmpty()) {
System.out.println("None");
} else {
for (int i = 0; i < cookies.size(); i++) {
System.out.println("- " + cookies.get(i).toString());
}
}
System.out.println("cookieName= " + cookies.get(0).getName());
System.out.println("cookieValue= " + cookies.get(0).getValue());
System.out.println();
System.out.println(resp.getStatusLine());
for (Header h : resp.getAllHeaders()) {
System.out.println(h);
}
System.out.println("**********End of Headers********** \n\n");
entity = resp.getEntity();
InputStream instream = entity.getContent();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bytes = new byte[instream.available()];
int reads = instream.read();
while (reads != -1) {
baos.write(reads);
reads = instream.read();
}
bytes = baos.toByteArray();
captchaImage = "data:image/png;base64," + new BASE64Encoder().encode(bytes);
// show captchaImage of base64 code
// System.out.println(captchaImage);
EntityUtils.consume(entity);
// 4.Use Json format to wrap url, key and source string.
// Then send response to ajax request from index.jsp
JSONObject jo = new JSONObject();
jo.put("__EVENTTARGET", __EVENTTARGET);
jo.put("__EVENTARGUMENT", __EVENTARGUMENT);
jo.put("__VIEWSTATE", __VIEWSTATE);
jo.put("__VIEWSTATEGENERATOR", __VIEWSTATEGENERATOR);
jo.put("captchaURL", captchaURL);
jo.put("captchaImage", captchaImage);
jo.put(cookies.get(0).getName(), cookies.get(0).getValue());
String bothJson = "[" + jo + "," + joOption + "]";
response.setContentType("application/json");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
out.print(bothJson);
out.flush();
}
