I am developing a testing system with jsp and java
At client side i have the following code:
var xmlhttp = new getXmlHttpRequestObject(); //xmlhttp holds the ajax object
function servletPost() {
if(xmlhttp) {
//var txtname = document.getElementById("testForm");
var form = $('#testForm');
xmlhttp.open("POST","servlet/TestingController",true);
xmlhttp.onreadystatechange = handleServletPost;
xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xmlhttp.send(form.serialize());
}
}
function handleServletPost() {
//var qComplexity = document.getElementsByName("qComplexity")[0].value;
if (xmlhttp.readyState == 4) {
if(xmlhttp.status == 200) {
var respText = xmlhttp.responseText;
document.getElementById("fullQuestion").innerHTML = respText;
// here i also should change the content of the answer options
// so i should get from servlet multiple variables
// which allows me to change div contents in my jsp like as respText.question or respText.answer[0]
} else {
alert("Ajax calling error");
}
}
}
At server side: (my Servlet)
public void doPost (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
.........................................................
.........................................................
PrintWriter out = res.getWriter();
String complex = null;
int categ_id = -1;
String asked_by = null;
String Qtext = null;
int qid = -1;
q_numb = 1;
q_numb++;
String sqlSelect = "SELECT * FROM questions WHERE complexity = '" + complexity
+ "'ORDER BY RANDOM() LIMIT 1;";
ResultSet r = myConnection.runQuery( sqlSelect );
session.setAttribute("member", tempMem);
while (r.next()) {
complex = r.getString(5);
categ_id = r.getInt(4);
asked_by = r.getString(3);
Qtext = r.getString(2);
qid = r.getInt(1);
String sqlA = "select * from answers where question_id = '" + qid
+ "' ORDER by RANDOM();";
ResultSet result = myConnection.runQuery( sqlA );
session.setAttribute("member", tempMem); }
So i need to send values of complex, Qtext, qid, categ_id and so on.
Is there any structures to send like from ajax to servlet, but visa versa?
And how to handle sent data in client side?
Thanks in advance!!!!
Use JSON. There are a myriad of free Java JSON marshallers. And JSON is natively supported by JavaScript.
Related
I have a ldap method that returns all users that are in it (almost 1300 users) and I want to return them by page, similar to what PagingAndSortingRepository does in Springboot:
If I have this endpoint ( users/?page=0&size=1 )and I wnat to return on page 0 just 1 entry.
Is there any way to do that?
Currently I have this but it doesn´t work:
SearchRequest searchRequest = new SearchRequest(ldapConfig.getBaseDn(), SearchScope.SUB,
Filter.createEqualityFilter("objectClass", "person"));
ASN1OctetString resumeCookie = null;
while (true) {
searchRequest.setControls(new SimplePagedResultsControl(pageable.getPageSize(), resumeCookie));
SearchResult searchResult = ldapConnection.search(searchRequest);
numSearches++;
totalEntriesReturned += searchResult.getEntryCount();
for (SearchResultEntry e : searchResult.getSearchEntries()) {
String[] completeDN = UaaUtils.searchCnInDn(e.getDN());
String[] username = completeDN[0].split("=");
UserEntity u = new UserEntity(username[1]);
list.add(u);
System.out.println("TESTE");
}
SimplePagedResultsControl responseControl = SimplePagedResultsControl.get(searchResult);
if (responseControl.moreResultsToReturn()) {
// The resume cookie can be included in the simple paged results
// control included in the next search to get the next page of results.
System.out.println("Antes "+resumeCookie);
resumeCookie = responseControl.getCookie();
System.out.println("Depois "+resumeCookie);
} else {
break;
}
Page<UserEntity> newPage = new PageImpl<>(list, pageable, totalEntriesReturned);
System.out.println("content " + newPage.getContent());
System.out.println("total elements " + newPage.getTotalElements());
System.out.println(totalEntriesReturned);
}
I'm unsure if this is the proper way, but here's how I went about it:
public PaginatedLookup getAll(String page, String perPage) {
PagedResultsCookie cookie = null;
List<LdapUser> results;
try {
if ( page != null ) {
cookie = new PagedResultsCookie(Hex.decode(page));
} // end if
Integer pageSize = perPage != null ? Integer.parseInt(perPage) : PROCESSOR_PAGE_SIZE;
PagedResultsDirContextProcessor processor = new PagedResultsDirContextProcessor(pageSize, cookie);
LdapName base = LdapUtils.emptyLdapName();
SearchControls sc = new SearchControls();
sc.setSearchScope(SearchControls.SUBTREE_SCOPE);
sc.setTimeLimit(THREE_SECONDS);
sc.setCountLimit(pageSize);
sc.setReturningAttributes(new String[]{"cn", "title"});
results = ldapTemplate.search(base, filter.encode(), sc, new PersonAttributesMapper(), processor);
cookie = processor.getCookie();
} catch ( Exception e ) {
log.error(e.getMessage());
return null;
} // end try-catch
String nextPage = null;
if ( cookie != null && cookie.getCookie() != null ) {
nextPage = new String(Hex.encode(cookie.getCookie()));
} // end if
return new PaginatedLookup(nextPage, results);
}
The main issue I kept on hitting was trying to get the cookie as something that could be sent to the client, which is where my Hex.decode and Hex.encode came in handy.
PersonAttributesMapper is a private mapper that I have to make the fields more human readable, and PaginatedLookup is a custom class I use for API responses.
I would like to catch incoming emails and send them a web service (rather than just to a mail server).
--
After some searching I found a way of getting new emails via polling - see below: This may be of some help to others. Is there a way to receive messages by SMTP? Perhaps by ISAPI ???
using Limilabs.Mail;
using Limilabs.Client.IMAP;
public ActionResult checkIMAPmail()
{
string rval = "not a sausage";
using (Imap imap = new Imap())
{
imap.Connect(<mail server>);
imap.Login(<username>, <password>);
imap.SelectInbox();
List<long> uids = imap.Search(Flag.Unseen);
foreach (long uid in uids)
{
byte[] ourBytes = imap.GetMessageByUID(uid);
IMail email = new MailBuilder().CreateFromEml(ourBytes);
rval = email.Subject + " [" + email.From + "][" + email.Text + "]";
}
imap.Close();
}
return Content(rval, "text/html");
}
See also http://stackoverflow.com/questions/670183/accessing-imap-in-c-sharp
for other IMAP packages, although note the change to using byte[], above.
Given that Limilabs.Mail is a paid service, I finally used MailKit:
using MailKit;
public int checkIMAPmail()
{
int numEmails = 0;
try {
using (var client = new MailKit.Net.Imap.ImapClient())
{
client.ServerCertificateValidationCallback = (s, c, h, e) => true;
client.Connect(ourSmtpClient);
// disable the XOAUTH2 authentication mechanism.
client.AuthenticationMechanisms.Remove("XOAUTH2");
client.Authenticate(ourSmtpAdminUser, ourSmtpAdminUserPwd);
// The Inbox folder is always available on all IMAP servers...
var inboxFolder = client.Inbox;
var savedFolder = client.GetFolder("saved");
inboxFolder.Open(FolderAccess.ReadWrite);
for (int ii = 0; ii < inboxFolder.Count; ii++)
{
var query = MailKit.Search.SearchQuery.NotSeen;
foreach (var uid in inboxFolder.Search(query))
{
var thisMsg = inboxFolder.GetMessage(uid);
string thisDate = notNullString(thisMsg.Date);
string thisSubject = notNullString( thisMsg.Subject);
string thisBody = notNullString(thisMsg.GetTextBody(0)); // plain text
string thisFromName = "";
string thisFromEmail = "";
if ( thisMsg.From != null)
{
// just get the first
foreach( var mb in thisMsg.From.Mailboxes)
{
thisFromName = notNullString( mb.Name);
thisFromEmail = notNullString( mb.Address);
break;
}
}
numEmails += 1;
// move email to saved
inboxFolder.MoveTo(uid, savedFolder);
}
}
client.Disconnect(true);
}
}
catch (Exception exc)
{
log2file("checkIMAPmail Error: " + exc.ToString());
}
return numEmails;
}
I'm a ajax beginner. I'm trying to write a simple search suggestion. When I use firefox test It worked, but when I use chrome I got that: Uncaught TypeError: Cannot read property 'getElementsByTagName' of null
I wrote this on the callback function
xhr.onreadystatechange = function () {
if (xhr.readyState === 4 && xhr.status === 200) {
var data = xhr.responseXML;
var x = data.getElementsByTagName("suggestion");
var div = document.getElementById("suggest")
div.innerHTML = "";
showSuggest();
for (var i = 0; i < x.length; i++) {
var result= x[i].firstChild.nodeValue;
div.innerHTML += "<div id='sResult' onmouseover='over(this)' onmouseout='out(this)' onclick='replace(this)' >"
+ result+ "</div>";
}
}
}
and this on Servlet doGet method:
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("test/xml;charset=UTF-8");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
String keyword = request.getParameter("keyword");
//get suggestion from db
List<KeyWord> kw = SearchService.suggest(keyword);
PrintWriter pw = response.getWriter();
pw.println("<?xml version='1.0' encoding='UTF-8'?>");
pw.write("<suggestions>");
for(KeyWord k:kw){
pw.write("<suggestion>");
pw.write(k.getContent());
pw.write("</suggestion>");
}
pw.write("</suggestions>");
pw.flush();
pw.close();
}
If response.setContentType("test/xml;charset=UTF-8"); is not a typo in your post then correct it to say response.setContentType("text/xml;charset=UTF-8"); and hopefully IE and Chrome populate responseXML.
Have you tried this
var x = data.documentElement.getElementsByTagName("suggestion");
instead of
var x = data.getElementsByTagName("suggestion");
?
I am trying to use await on my async method but it didn't work. I input 2 array of parameters when calling the post method, only the last one is inserted
to database(I use Elasticsearch as database so when the _id is the same the document will replaced by the new one). and I found out when insert is not done yet the program is already run to query the database and the result is 0 so it's insert again instead of update.
I already add await on my program but it didn't work out. Can anyone help me with this problem? Thanks
here is my code
// POST api/values
[HttpPost]
public async Task<AvatarModel.AvatarResponse> Post(MultiLanguageTemp[] LangTemp)
{
//process param to multilanguage model
AvatarModel.AvatarResponse Resp = new AvatarModel.AvatarResponse();
try
{
for (int i = 0; i < LangTemp.Length; i++)
{
string Type = LangTemp[i].Type;
if ("ErrorCode".Equals(Type))
{
}
else
{
string GetLabelId = LangTemp[i].LabelId;
string GetTranslation = LangTemp[i].Translation;
MultiLanguage Lang = new MultiLanguage();
Lang.Type = LangTemp[i].Type;
Lang.Site = LangTemp[i].Site;
Lang.Language = LangTemp[i].LangId;
Lang.Source = LangTemp[i].Source;
Lang.TranslationList = new Dictionary<string, string>();
Lang.TranslationList.Clear();
Lang.TranslationList.Add(GetLabelId, GetTranslation);
//search elasticsearch first using id TYPE+SITE+LANG_ID+SOURCE
string ESResponse = await GetMultiLangAsync(Lang);
JObject GetResp = JObject.Parse(ESResponse);
//get elasticsearch Hits count
JToken GetHitsTotal = GetResp.SelectToken("hits.total");
int Hits = int.Parse(GetHitsTotal.ToString());
// if id exist then do update else do insert
if (Hits > 0)
{
string ResponseUpdate = await UpdateMultiLangAsync(GetLabelId, GetTranslation,Lang);
if (!ResponseUpdate.ToString().ToUpper().Contains("ERROR"))
{
Resp.Result = "0000000";
Resp.Message = "Update MultiLanguage Info is Success";
}
else
{
Resp.Result = "9000003";
Resp.Message = "Update MultiLanguage Info into ES failed";
}
}
else
{
//tasks.Add(InsertMultiLangAsync(Lang));
//insert new document into elasticsearch
string InsertESResponse = await InsertMultiLangAsync(Lang);
if (!InsertESResponse.ToUpper().Contains("ERROR"))
{
Resp.Result = "0000000";
Resp.Message = "Insert MultiLanguage Info is Success";
}
else
{
Resp.Result = "9000003";
Resp.Message = "Insert MultiLanguage Info into ES failed";
}
}
}
}
}
catch (Exception E)
{
Resp.Result = "9000005";
Resp.Message = E.Message.ToString();
}
return Resp;
}
public async Task<string> GetMultiLangAsync(MultiLanguage Lang)
{
var Client = new HttpClient();
Client.BaseAddress = new Uri("http://localhost:9200/multilanguage/MultiLangInfo/");
Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var Query = "{\"query\": {\"match\": {\"_id\":\"" + Lang.Type + Lang.Site + Lang.Language + Lang.Source + "\"}}}";
var StringContent = new StringContent(Query, Encoding.UTF8, "application/json");
var Response = Client.PostAsync("_search", StringContent).Result.Content.ReadAsStringAsync();
//JObject GetResp = JObject.Parse(Response.Result);
return await Response;
}
public async Task<string> InsertMultiLangAsync(MultiLanguage Lang)
{
var Client = new HttpClient();
Client.BaseAddress = new Uri("http://localhost:9200/multilanguage/");
Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var JsonTextMultiLang = JsonConvert.SerializeObject(Lang, Formatting.None, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
var StringContent = new StringContent(JsonTextMultiLang, Encoding.UTF8, "application/json");
var ResponseInsert = Client.PostAsync("MultiLangInfo/" + Lang.Type + Lang.Site + Lang.Language + Lang.Source, StringContent).Result.Content.ReadAsStringAsync();
return await ResponseInsert;
}
public async Task<string> UpdateMultiLangAsync(string GetLabelId,string GetTranslation, MultiLanguage Lang)
{
var UpdateES = "{\"doc\":{\"TranslationList\":{\"" + GetLabelId + "\":\"" + GetTranslation + "\"}},\"detect_noop\":true}";
var Client = new HttpClient();
Client.BaseAddress = new Uri("http://localhost:9200/multilanguage/MultiLangInfo/" + Lang.Type + Lang.Site + Lang.Language + Lang.Source + "/");
Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var StringContent = new StringContent(UpdateES, Encoding.UTF8, "application/json");
var ResponseUpdate = Client.PostAsync("_update", StringContent).Result.Content.ReadAsStringAsync();
return await ResponseUpdate;
}
Here is my insight.
Based on the details you provided, you have a long-running task that would eventually create/update a record in your database. Now, the problem you encounter is the second http request you send is not waiting for the first one to finish even though you are using async/await pattern. Well, this is not how it works. Regardless of what you do, whether you block the thread or not, there is thread pooling and distinct http calls will have their own thread. So using async/await would not affect that at all. For the most part, you're using async/await correctly. However, what you're trying to achieve is not done by async/await. You might want to try a messaging system to queue all the requests. In that case, you can't put clients on hold, You'd generate a request id and send it to them immediately and process the request asynchronously in time.
My Put method is as follows:
public void Post([FromBody]RavenUserView view)
{
if (ModelState.IsValid)
{
var request = new CreateUserRequest();
request.ID = view.ID;
request.Name = view.Name;
request.UserName = view.UserName;
request.Password = EncryptionDecryption.EncryptString(view.Password);//Encrypt The Password
request.Email = view.Email;
request.Phone = view.Phone;
request.Country = "x";
request.Note = "y";
request.IsActive = view.IsActive;
request.Creator = view.Creator;
request.CreationDate = DateTime.UtcNow;
request.ModificationDate = DateTime.UtcNow;
request.Remarks = "z";
var response = _facade.CreateUser(request);
SaveUserDetailsToCookie(response.RavenUser.ID, response.RavenUser.UserName, EncryptionDecryption.DecryptString(response.RavenUser.Password));//Cookie should be stored Decrypted Format
HttpContext.Current.Session[SessionDataKey.UserId.ToString()] = response.RavenUser.ID.ToString();
HttpContext.Current.Session[SessionDataKey.UserName.ToString()] = response.RavenUser.UserName;
}
}
But When I run my project and try to save my information then it throw me an exception "Object Reference is not set to the reference of an object"
I am using Web Api as my controller class.
After reading various documents I found that Api is stateless. Now how can I store my user information for further use.
Use:
public void Post([Bind(Include = "ID,Name,UserName,....")] CreateUserRequest request)
{
if(ModelState.IsValid)
{
var response = _facade.CreateUser(request);
SaveUserDetailsToCookie(response.RavenUser.ID, response.RavenUser.UserName, EncryptionDecryption.DecryptString(response.RavenUser.Password));//Cookie should be stored Decrypted Format
HttpContext.Current.Session[SessionDataKey.UserId.ToString()] = response.RavenUser.ID.ToString();
HttpContext.Current.Session[SessionDataKey.UserName.ToString()] = response.RavenUser.UserName;
}
}