URL Encode and Decode Special character in Java

Question

In Java, I need to use HTTP Post to send request to server, but if in the parameter of the URL contains some special character it throws below Exception

Answer 1

To encode text for safe passage through the internets:

import java.net.*;
...
try {
    encodedValue= URLEncoder.encode(rawValue, "UTF-8");
} catch (UnsupportedEncodingException uee) { }

And to decode:

try {
    decodedValue = URLDecoder.decode(rawValue, "UTF-8");
} catch (UnsupportedEncodingException uee) { }

Answer 2

String data = request.getParameter(param1);

If this is the servlet API, the parameters have already been decoded. No further handling of percent-encoding is necessary.

---

I haven't used HttpClient, but ensure it is sending the encoding in the header:

Content-type: application/x-www-form-urlencoded; charset=UTF-8

Or, if you must, set the known encoding before any getParameter calls:

request.setCharacterEncoding("UTF-8");

Answer 3

Sadly url encoder will not solve your problem. I had this problem and used a custom utility. I remember this I got from googling ;).

http://www.javapractices.com/topic/TopicAction.do?Id=96

Answer 4

try guava

use com.google.common.net.UrlEscapers

it works fine with chinese

like this:

Escaper escaper = UrlEscapers.urlFragmentEscaper();
String result = escaper.escape(yoururl);