Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Bedienungsanleitung PDF herunterladen (Seite 23)

The web-apps.xml File and Virtual Servers

Chapter 2 Web Applications 23

If a servlet uses the ServletRequest.getParameter method to retrieve values in

form fields having non-UTF-8 characters, the

enc attribute must be set to auto (the

default). Otherwise, the values extracted by the

getParameter method are zeros or

are undefined. For more information see “ServletRequest.getParameter,” on page

74.

The

enc attribute setting applies to how a servlet processes parameters after the

iPlanet Web Server receives a request. The URI that is sent to the server must

consist of only the standard ASCII set, especially if the request method is GET. All

other characters must be encoded.

For example, to encode a backslash, you would replace the backslash with a

followed by the hexadecimal number corresponding to the backslash in the ASCII

character set,

5c. Therefore, vw\xyz becomes vw%5cxyz.

For more information, read section 2.2 of the following document from the URI

working group of the Internet Engineering Task Force:

http://www.ietf.org/rfc/rfc1738.txt

auto (Default) Tries to figure out the proper encoding

from, in order, 1) the charset if it is set in the

Content-Type header, 2) the

parameterEncoding attribute (see

“ServletRequest.setAttribute,” on page 73),

then 3) a hidden form field defined in

form-hint-field. Otherwise, the system

default encoding is used. Set this option to prevent

misinterpretation of non-ASCII characters in

servlet parameters.

When this property is set to auto, the server has to

convert native characters into a java byte array

before transforming them into the requested

encoding. Therefore, performance is slightly better

for none or a specific encoding.

form-hint-field The name of the hidden field in the form that specifies the

encoding. The default is j_encoding.

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Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Bedienungsanleitung Seite 23