In my jsp:
<form name="frmTest" action="test" method="post">
<input type="submit" value="sub" name="sub" />
<img id="cImg" name="cImg" src="${param.src}">
</form>
In my servlet:
#Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
String imgUrl = req.getParameter("cImg");
I want to retrieve the src data of my image in canvas. It will be in base 64 data URI format. The above will give me null value. How should I go about doing it, any helps will be appreciated.
No you cannot, You can get data with only name attribute.
What you can do is take a hidden variable ,add value to it and get in servlet.
Like
<form name="frmTest" action="test" method="post">
<input type="submit" value="sub" name="sub" />
<img id="cImg" name="cImg" src="${param.src}">
<input type="hidden" name="hiddenSrc" value="${param.src}" />
</form>
in servlet
String hiddenimgUrl = req.getParameter("hiddenSrc");
Related
i was making a simple page with a formulary using bootstrap and Eclipse (With JBoss).
Html code(Just < body > part):
<div class="jumbotron">
<div class="container">
<form method="POST" class="form-inline" action="validarIngresoAdmin.htm">
<h4>Ingrese sus datos:</h4>
<input type="text" class="form-control input-sm" placeholder="Email" name="txtEmail">
<input type="password" class="form-control input-sm" placeholder="Password" name="txtPsw">
<button type="submit" class="btn btn-danger">Iniciar sesión</button>
</form>
</div>
but when i try to get the attributes txtEmail and txtPsw they return null.
Eclipse code:
private void doPost (HttpServletRequest request, HttpServletResponse response) throws IOException
{
PrintWriter pw = response.getWriter();
String email = (String)request.getAttribute("txtEmail");
String pass = (String)request.getAttribute("txtPsw");
}
¿Why 'email' and 'pass' attributes return null?
P.S: Sorry about my english.
Thanks.
To retrieve http variables, you should be using getParameter rather than getAttribute.
I try to submit two forms with one button, but value of first form(input) is null.
test.jsp
<body>
<script>
function submitAllForms(){
console.log($('input[name=valueDateFromFilter]').val());
console.log($('input[name=valueDateToFilter]').val());
document.formDateFromFilter.submit();
document.formDateToFilter.submit();
};
</script>
<form method="post" action="./Servlet" name="formDateFromFilter">
<input class="span2" size="16" type="text" name="valueDateFromFilter">
</form>
<form method="post" action="./Servlet" name="formDateToFilter">
<input class="span2" size="16" type="text" name="valueDateToFilter">
</form>
<a class="btn" href="#" onclick="submitAllForms();"><i class="icon-message"></i></a>
</body>
doPost method in Servlet.jsp
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String a = request.getParameter("valueDateFromFilter");
String b = request.getParameter("valueDateToFilter");
System.out.println(a);
System.out.println(b);
}
In browser console i see values of both strings, but in the server log console value of first string (variable a) is null
This is poor design and probably won't work. The better way to do it would be to build a JSP/servlet that receives both sets of data and calls the other servlets with the appropriate fields programatically on the server side
I'm developing a web app using liferay portal server 6.2
JSP code -
<form id="mainForm" action="<portlet:actionURL/>" method="post" enctype="multipart/form-data" >
<input type="hidden" id="varImport" name="varImport"/>
<div class="tab-pane" id="uploadFile">
<p>Please upload a file</p>
<div id="inputFileDiv">
<input type="file" name="uploadFile" />
</div>
</div>
<input type="submit" class="btn btn-info" onClick="import()" value="IMPORT" />
</form>
<script>
function import() {
console.log("importing");
document.getElementById("varImport").value = "IMPORTFILE";
document.getElementById("mainForm").submit();
}
</script>
Servlet code -
#Override
public void processAction(ActionRequest request, ActionResponse response) throws PortletException, IOException {
System.out.println("myPortlet.processAction() >> " + request.getParameter("varImport"));
//... rest of the code.
}
If I remove enctype from jsp form, I get the value of varImport in my servlet.
But if i keep it, it returns null.
What am i missing?
import com.liferay.portal.util.PortalUtil;
UploadPortletRequest uploadRequest = PortalUtil.getUploadPortletRequest(request);
System.out.println("myPortlet.processAction() >> " + uploadRequest.getParameter("varImport"));
I created a form like;
<portlet:actionURL var="myFriendlyURI">
<portlet:param name="action" value="addUser"></portlet:param>
</portlet:actionURL>
<form id="userForm" name="userForm" action="${myFriendlyURI}" method="post">
Name :- <input type="text" name="userName">
<input type="submit">
</form>
In processAction(ActionRequest request, ActionResponse response) method, how can I identify the request URI based on myFriendlyURI?
request.getAttribute("javax.servlet.forward.request_uri").toString()) is giving only "/web/portal/Adduser-PageName".
I just want to check the request just like we are doing in Servlet class ;
if(request.getRequestURI().endsWith("user/add")) { // <form action="user/add" ..... >
System.out.println("Ends with : user/add ");
// do actions here
}
Use this
HttpServletRequest convertReq = PortalUtil.getHttpServletRequest(actionRequest);
HttpServletRequest originalReq = PortalUtil.getOriginalServletRequest(actionRequest);
PortalUtil.getCurrentCompleteURL();
Reference to the link has many examples
This question already has answers here:
How can I upload files to a server using JSP/Servlet?
(14 answers)
Closed 7 years ago.
Hey I am quite new to servlet environment. Here I am trying to post a form to my servlet with something like this:
<form action="OnlineExam?q=saveQuestion" method="post" enctype="multipart/form-data">
<fieldset>
<legend>Question</legend>
<textarea class="questionArea" id="question" name="question">Enter Question.</textarea>
<br class="clearFormatting"/>
Attach File<input type="file" name="file" />
<input class="optionsInput" value="Option A" name="A" onfocus = "clearValues('A')" onblur = "setValues('A')"/>
<br class="clearFormatting"/>
<input class="optionsInput" value="Option B" name="B" onfocus = "clearValues('B')" onblur = "setValues('B')"/>
<br class="clearFormatting"/>
<input class="optionsInput" value="Option C" name="C" onfocus = "clearValues('C')" onblur = "setValues('C')"/>
<br class="clearFormatting"/>
<input class="optionsInput" value="Option D" name="D" onfocus = "clearValues('D')" onblur = "setValues('D')"/>
<br/>
<input type="submit" value="Save" />
<input type="reset" value="Cancel" />
<button style="display: none" onclick="return deleteQuestion()" >Delete</button>
</fieldset>
</form>
And the servlet is something like this:
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
if(request.getParameter("q").equals("saveQuestion")){
saveQuestion(request);
}
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
public void saveQuestion(HttpServletRequest request){
Enumeration enum = request.getParameterNames();
while (enum.hasMoreElements()) {
String pName = (String) enum.nextElement();
String[] pValues = request.getParameterValues(pName);
System.out.print("<b>"+pName + "</b>: ");
for (int i=0;i<pValues.length;i++) {
System.out.print(pValues[i]);
}
out.print("<br>");
}
}
But it is printing only the q parameter not the other form fields.
I also tried to get them with the request.getParameter("question") but this was also not working. So where i am going wrong. actually i am from PHP background and recently started coding in java so please help.
Thanks in advance
When you use enctype="multipart/form-data" you can not access request parameter as you normally do[that is request.getParameter("question")]. You have to use MultipartRequest object.
And also you submit form in POST and then in servlet you redirect it to doGet. Why so? Why don't directly use GET as a method in form submit.
Demo to use MultipartRequest:
String ph="images\\";
MultipartRequest req=new MultipartRequest(request, ph);
String question=req.getParameter("question");
System.out.println("Question: "+question);
why is your form action looking like a GET request with the ?q=saveQuestion, while the form type is POST? maybe the GET parameter is ignored on this call.