package com.***.***.***;
import javax.servlet.*;
import java.io.IOException;
/**
* <p>Filter that sets the character encoding to be used in parsing the
* incoming request, either unconditionally or only if the client did not
* specify a character encoding. Configuration of this filter is based on
* the following initialization parameters:</p>
* <ul>
* <li><strong>encoding</strong> - The character encoding to be configured
* for this request, either conditionally or unconditionally based on
* the <code>ignore</code> initialization parameter. This parameter
* is required, so there is no default.</li>
* <li><strong>ignore</strong> - If set to "true", any character encoding
* specified by the client is ignored, and the value returned by the
* <code>selectEncoding()</code> method is set. If set to "false,
* <code>selectEncoding()</code> is called <strong>only</strong> if the
* client has not already specified an encoding. By default, this
* parameter is set to "true".</li>
* </ul>
*
* <p>Although this filter can be used unchanged, it is also easy to
* subclass it and make the <code>selectEncoding()</code> method more
* intelligent about what encoding to choose, based on characteristics of
* the incoming request (such as the values of the <code>Accept-Language</code>
* and <code>User-Agent</code> headers, or a value stashed in the current
* user´s session.</p>
*
*/
public class EncodingFilter 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);
      }
}//EOC
WEB.XML文件：将下面的代码放在WEB.xml文件的<display-name>下面就行了
<filter>
<filter-name>encodingFilter</filter-name>
<display-name>EncodingFilter</display-name>
<description>Set the request encoding</description>
<filter-class>com.voip.admin.util.EncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GB18030</param-value>
</init-param>
<init-param>
<param-name>ignore</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

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