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struts中配置过滤文件!

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

在web.xml中加上

<filter>

<filter-name>Set Character Encoding</filter-name>

<filter-class>com.ytoa.util.SetCharacterEncodingFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>GB2312</param-value>

</init-param>

<init-param>

<param-name>ignore</param-name>

<param-value>true</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>Set Character Encoding</filter-name>

<servlet-name>action</servlet-name>

</filter-mapping>

过滤文件为:

package com.ytoa.util;

import javax.servlet.*;

import java.io.IOException;

public class SetCharacterEncodingFilter 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);

}

// Pass control on to the next filter

chain.doFilter(request, response);

}

/**

* Place this filter into service.

*

* @param filterConfig The filter configuration object

*/

public void init(FilterConfig filterConfig) throws ServletException {

this.filterConfig = filterConfig;

this.encoding = filterConfig.getInitParameter("encoding");

String value = filterConfig.getInitParameter("ignore");

if (value == null)

this.ignore = true;

else if (value.equalsIgnoreCase("true"))

this.ignore = true;

else if (value.equalsIgnoreCase("yes"))

this.ignore = true;

else

this.ignore = false;

}

// ------------------------------------------------------ Protected Methods

/**

* Select an appropriate character encoding to be used, based on the

* characteristics of the current request and/or filter initialization

* parameters. If no character encoding should be set, return

* <code>null</code>.

* <p>

* The default implementation unconditionally returns the value configured

* by the <strong>encoding</strong> initialization parameter for this

* filter.

*

* @param request The servlet request we are processing

*/

protected String selectEncoding(ServletRequest request) {

return (this.encoding);

}

}

 
 
 
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