Encoding Filter实现

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

public class CharacterEncodingFilter implements Filter {

// ----------------------------------------------------- Instance Variables

/**

* The default character encoding to set for requests that pass through

* this filter.

*/

protected String encoding = null;

/**

* The filter configuration object we are associated with. If this value

* is null, this filter instance is not currently configured.

*/

protected FilterConfig filterConfig = null;

/**

* Should a character encoding specified by the client be ignored?

*/

protected boolean ignore = true;

// --------------------------------------------------------- Public Methods

/**

* Take this filter out of service.

*/

public void destroy() {

this.encoding = null;

this.filterConfig = null;

}

/**

* Select and set (if specified) the character encoding to be used to

* interpret request parameters for this request.

*

* @param request The servlet request we are processing

* @param result The servlet response we are creating

* @param chain The filter chain we are processing

*

* @exception IOException if an input/output error occurs

* @exception ServletException if a servlet error occurs

*/

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException,

ServletException {

// Conditionally select and set the character encoding to be used

if (ignore (request.getCharacterEncoding() == null)) {

String encoding = selectEncoding(request);

if (encoding != null) {

request.setCharacterEncoding(encoding);

}

}

 
 
 
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