Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Bedienungsanleitung PDF herunterladen (Seite 74)

Clarifications for Using Methods

74 iPlanet Web Server, Enterprise Edition Programmer’s Guide to Servlets • May 2001

ServletRequest.getParameter

public java.lang.String getParameter(java.lang.String name)

Retrieves the value associated with a parameter name.

Clarification

When your form fields contain non-UTF-8 characters, you must do one of the

following, or the values extracted by the

getParameter method are zeros or are

undefined:

• Set the

enc attribute of the parameter-encoding element to auto (the default)

in the

web-apps.xml file. For more information, see “parameter-encoding,” on

page 22.

• Set the

parameterEncoding property to auto (the default) or responseCT in

the

contexts.properties file, as in iPlanet Web Server 4.x. For more

information, see “parameterEncoding,” on page 92.

Because the original encoding used to enter data into form fields is lost when the

data is URL-encoded, you must do the following:

• Always set the response content type when sending a form to a client. This

ensures that the entire form gets safely to the client.

• When sending form data to a server that uses a different locale than the form

fields, you must tell the server the

charset before you call the getParameter

method, as follows:

❍ If the servlet or JSP that generated the form is different than the one

processing the form, use a hidden field in the form (called

j_encoding by

default), for example:

❍ Set the com.iplanet.server.http.servlet.parameterEncoding

attribute in the request object (see “ServletRequest.setAttribute,” on page

73). The

getParameter method uses this attribute to decode the

parameters.

❍ If parameterEncoding=responseCT in contexts.properties and the

same servlet or JSP generates and processes the form, you can set the

response content type. For servlets, explicitly set it as in this example:

res.setContentType("text/plain; charset=Shift_JIS");

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Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Bedienungsanleitung Seite 74