URL escape characters

Principles of URL escape characters

If the form action is list. JSF? Act = Go & State = 5

Then, request. getparameter can be used to obtain the values of act and state.

If your intention is the act = 'go & State = 5' string, You must escape & to get the exact act value on the server.

[Prerequisites]

For URLs submitted using the get method, the browser first parses and matches a parameter and Its Value Based on the HTTP protocol before submission. URL parameters are separated by &, which is the basis for parameter configuration in the browser. If your parameter value contains special characters such as &, you will get unexpected values on the server side. Therefore, special characters of the URL must be escaped.
The encoding format is % plus the characters' ASCII code, that is, a percent sign %, followed by the corresponding characters' ASCII (hexadecimal) code value. For example, the Space Encoding value is "% 20 ".
The following table lists some special URL symbols and codes.

Hexadecimal value
1. In the + URL, the plus sign indicates space % 2B
2. the space in the space URL can be + or encoded as % 20
3./separate directories and subdirectories % 2f
4 .? Separate the actual URL and parameter % 3f
5.% specify special characters % 25
6. # indicates bookmarks % 23
7. & separator between parameters specified in URL % 26
8. = value of the specified parameter in the URL % 3d

So you should write the preceding action as list. JSF? Act = go % 26 state = 5