Httputility. urlencode, urldecode, server. urlencode, and urldecode Encoding

Httputility. urlencode, urldecode, server. urlencode, and urldecode Encoding

Httputility. urlencode method:

Encode the URL string to implement reliable HTTP transmission from the Web server to the client.

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Converts byte arrays to encoded URL strings for reliable HTTP transmission from the Web server to the client.
[C #] public static string urlencode (byte []);

Encode the URL string to implement reliable HTTP transmission from the Web server to the client.
[C #] public static string urlencode (string );

The URL string is encoded using the specified encoding object to implement reliable HTTP transmission from the Web server to the client.
[C #] public static string urlencode (string, encoding );

From the specified position in the array to the specified number of bytes, the byte array is converted into a URL-encoded string to implement reliable HTTP transmission from the Web server to the client.
[C #] public static string urlencode (byte [], Int, INT );

Httputility. urldecode method:

Converts a string that has been encoded for transmission in a URL into a decoded string.

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Converts a string that has been encoded for transmission in a URL into a decoded string.
[C #] public static string urldecode (string );

Use the specified decoded object to convert the URL-encoded byte array to a decoded string.
[C #] public static string urldecode (byte [], encoding );

Use the specified encoding object to convert a URL-encoded string to a decoded string.
[C #] public static string urldecode (string, encoding );

Use the specified encoding object to convert the URL encoded byte array to a decoded string starting from the specified position in the array to the specified number of bytes.
[C #] public static string urldecode (byte [], Int, Int, encoding );

Server is an instance of the httpserverutility class and a property of system. Web. UI. Page.
Httpserverutility. urlencode method:
Encode the string for reliable HTTP transmission from the Web server to the client through the URL.

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Encode the string and return the encoded string.
[C #] Public String urlencode (string );

The URL encodes the string and sends the result output to the textwriter output stream.
[C #] public void urlencode (string, textwriter );

Httpserverutility. urldecode method:
Decodes a string that is encoded for HTTP transmission and sent to the server in the URL.

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Perform URL Decoding on the string and return the decoded string.
[C #] Public String urldecode (string );

Decodes the HTML string received in the URL and sends the result output to the textwriter output stream.
[C #] public void urldecode (string, textwriter );

Note:
1. httputility. urlencode and httputility. urldecode are static methods, while server. urlencode and server. urldecode are instance methods.
2. Server is an instance of the httpserverutility class and a property of system. Web. UI. Page.
3. the string encoded with httputility. urlencode is different from the string object encoded with server. urlencode:
For example:

String url = "http://www.xingzhu.net.cn? Name = Customer Management ";
Response. Write (httputility. urlencode (URL ));
Response. Write ("<br> ");
Response. Write (server. urlencode (URL ));

The output result is:
HTTP % 3A % 2f % 2fwww.xingzhu.net.cn % 3 fname % 3d % E5 % AE % A2 % E6 % 88% B7 % E7 % AE % a1 % E7 % 90% 86
HTTP % 3A % 2f % 2fwww.xingzhu.net.cn % 3 fname % 3d % E5 % AE % A2 % E6 % 88% B7 % E7 % AE % a1 % E7 % 90% 86

Cause: the server. urlencode encoding method is based on the encoding method set by the local program, while httputility. urlencode is encoded in. Net UTF-8 format by default.

If you change the program:

String url1 = "http://www.xingzhu.net.cn/Search.aspx? Type = News & tags = Manufacturing ";
Response. Write (httputility. urlencode (url1, system. Text. encoding. getencoding ("gb2312 ")));
Response. Write ("<br> ");
Response. Write (server. urlencode (url1 ));

The output result is:

HTTP % 3A % 2f % 2fwww.xingzhu.net.cn % 2fsearch. aspx % 3 FTYPE % 3 dnews % 26 tags % 3d % D6 % C6 % D4 % EC % D2 % B5
HTTP % 3A % 2f % 2fwww.xingzhu.net.cn % 2fsearch. aspx % 3 FTYPE % 3 dnews % 26 tags % 3d % E5 % 88% B6 % E9 % 80% A0 % E4 % B8 % 9A

3. Sometimes the URLs transmitted by other systems are encoded in other encoding methods.
This section describes a self-written method to obtain the querystring of the specified encoding format.

Public String getnonnullquerystring (string key, encoding)
{
// Reference the system. Collections. Specialized and system. Text namespaces.
String stringvalue;
System. Collections. Specialized. namevaluecollection encodingquerystring;
// This method is added in 2.0.
Encodingquerystring = httputility. parsequerystring (request. url. query, encoding );
// The key in 'is the key of the parameter you submitted
Return encodingquerystring [Key]! = NULL? Encodingquerystring [Key]. Trim ():"";
}

Call:
String url = getnonnullquerystring ("url", encoding. utf8). Trim ();