Does anyone know of any good C++ code that does this?
I'm learning the concept of Cookies in PHP from this link
Till now I've understood that
A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. With PHP, you can both create and retrieve cookie values.
I studied the following demo program present at the above link location :
<!DOCTYPE html><?php $cookie_name = "user"; $cookie_value = "John Doe"; setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // 86400 = 1 day?><html> <body> <?php if(!isset($_COOKIE[$cookie_name])) { echo "Cookie named '" . $cookie_name . "' is not set!"; } else { echo "Cookie '" . $cookie_name . "' is set!<br>"; echo "Value is: " . $_COOKIE[$cookie_name]; } ?> <p><strong>Note:</strong> You might have to reload the page to see the value of the cookie.</p> </body></html>After going through the above code few questions have raised in my mind. I want satisfactory answers for them.
I also read one statement as below :
Note: The value of the cookie is automatically URLencoded when sending the cookie, and automatically decoded when received (to prevent URLencoding, use setrawcookie() instead).
Let me frankly tell you I didn't get at all what this sentence mean and what exactly does happen while sending and receiving cookies. I also don't know what is URL encoding and URL decoding in PHP?
It would be better if someone clears all of my above doubts with good explanatory answer and working code example.
Let me tell you honestly that as I heard from experienced PHP developers that Cookies and Session are the most important, basic concepts in PHP. But, I'm finding them difficult to understand. So, please explain me in simple and lucid language that I could grasp these concepts in a better and easier manner.
In short I want to understand the concept, functioning and usage of cookies in PHP with the working code example.
Thank You.
In my java web application I have to construct a URL and then call the URL. While creating the URL I am encoding the parameter value using URLEncoder.encode("text","UTF-8") But when we get the parameter at the receiving end and decode it - it is not decoding properly. I tried setting the encoded value as request attribute this works fine. But can't use it as per client request.
Wrote following code to test URLEncoder & URLDecoder and URLCodec from Apache commons codec functions.
StringBuffer sb = new StringBuffer("TestSpecialChar'` ~6 Æ æ Ç È 123"); //String testCharacters = "TestSpecialChar'` ~6 Æ æ Ç È 123"; String testCharacters = sb.toString(); try { String encoded = URLEncoder.encode(testCharacters, "UTF-8"); System.out.println("URLEncoder : " + encoded); System.out.println("URLDecoder : " + URLDecoder.decode(encoded, "UTF-8")); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } URLCodec urlc = new URLCodec("UTF-8"); try { String encoded = urlc.encode(testCharacters); System.out.println("urlc.encode : " + encoded); System.out.println("urlc.decode : " + urlc.decode(encoded)); } catch (EncoderException ee){ ee.printStackTrace(); } catch (DecoderException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { String encoded = urlc.encode(testCharacters); System.out.println("urlc.encode : " + encoded); System.out.println("URLDecoder : " + URLDecoder.decode(encoded, "UTF-8")); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (EncoderException ee){ ee.printStackTrace(); }This code works perfectly. Then I wrote a simple web application where I have two JSP page in which one is calling other with a encoded value in the URL. This is not showing the proper decoded value at the receiver end. Here is the code for your reference.
sender.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%><%@ page language="java" import="java.net.URLEncoder"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Sender</title><script type="text/javascript">function send(){window.location='<%=request.getContextPath()%>/jsp/receiver.jsp?txt=<%=URLEncoder.encode("TestSpecialChar'` ~6 Æ æ Ç È 123","UTF-8")%>';}</script></head><body onload="javascript:send();"></body></html>receiver.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%><%@ page language="java" import="java.net.URLDecoder"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Receiver</title></head><body><% if (request.getAttribute("encoded") != null){ URLDecoder.decode(request.getAttribute("encoded").toString(),"UTF-8"); }if (request.getParameter("txt") != null){%><%=URLDecoder.decode(request.getParameter("txt").toString(),"UTF-8")%>inside if getparameter<%}%></body></html>I get following output in the browser
TestSpecialChar'` ~6 Æ æ Ç È 123 inside if getparameter
instead of
TestSpecialChar'` ~6 Æ æ Ç È 123 inside if getparameter
Can someone please let me know what is wrong in test code and what is difference between request attribute and parameter due to which the attribute is decoded properly whereas parameter does not?
Temp solution:Solved it by doing following things:1) Created a class which would replace some specific characters with UTF 8 code.2) Removed passing of character data as URL parameters.3) Making sure that call to external URL is UTF-8 encoded.4) Any value received from external URL or which in the application is decoded before using the value.
Correct solution:To over come this problem the application has to be designed and coded with i18n in mind and all the JSP page with UTF-8 encoding.
Client side, in JavaScript,I prepare a POST parameter like this:
param_i_from_form = document.getElementById("param_i_from_form").value;param_i_for_url = "param_i=" + encodeURI(param_i_from_form);[MARKER_1]
Then I open and send the XML HTTP request:
xmlHttpRequest.open("POST", url, true); xmlHttpRequest.onreadystatechange = [...] xmlHttpRequest.send();Server side, in Java, I retrieve the parameter:
HttpServletRequest request[...]param_i = ((String[])request.getParameterMap().get("param_i"))[0];[MARKER_2]
At [MARKER_1] param_i_from_form has been encoded as expected.
For example: the ore was 28% copper was encoded as the%20ore%20was%2028%25%20copper
At [MARKER_2] param_i is: the ore was 28% copper
I am wondering when the decoding took place because I was expecting to get the%20ore%20was%2028%25%20copper at [MARKER_2]?
I am trying to decode this URL string using PHP's urldecode function:
urldecode("Ant%C3%B4nio+Carlos+Jobim");This is supposed to output...
'Antônio Carlos Jobim'...but instead is ouptutting this
'Antônio Carlos Jobim'I've tested the string in a JS-based online decoder with great success, but can't seem to do this operation server side. Any ideas?
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