Can someone tell me about encode,decode for http url parameters

Question

All,I got a problem that i want to redirect a url takes some parameters by GET type.if one parameter with url is a passwd field ,i thought it must be encode.And decode by recive-page.what class default in java can i use to encode the field and decode it.Or any solution better.please tell me.thank~

Answer 1

NEVER send a password using a GET - always use a POST. Otherwise, the password will be transmitted in plain text in the GET header.
URLEncode / decode is used to convert non-allowed ASCII characters (i.e. characters not allowed by the specification in parameter names or values) into a hex representation so they can be properly parsed. The receiving end uses URLDecode so the receiver obtains the exact parameters that were sent.
For example, if you wanted to pass a parameter called 'name' a value of 'big joe', you could try doing:
GET Servlets/myServlet?name=big joe
but this would not be valid, because spaces are not allowed in URL parameter lists (although Microsoft IE and IIS incorrectly allow this).
Instead, you should send:
GET Servlets/myServlet?name=big%20joe
The ascii value of a space is 32, which is hex 20 (0x20), thus the %20.
Hope that helps!
- K