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import javax.servlet.*;

import java.io.IOException; /** * 字符过滤器 *  * @author 大有软件 */ public class SetCharacterEncodingFilter implements Filter {     protected String encoding = "GBK";     protected FilterConfig filterConfig = null;     protected boolean ignore = true;     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;     }     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);     }     protected String selectEncoding(ServletRequest request) {         return (this.encoding);     }     public void destroy() {         this.encoding = null;         this.filterConfig = null;     } }注意问题：粗斜体的参数部分必须和过滤器中的属性要一样，否则过滤器可能不起作用。 <!-- 字符过滤器 -->     <filter>         <filter-name>encodeFilter</filter-name>         <filter-class>             com.dayou.util.SetCharacterEncodingFilter         </filter-class>         <init-param>             <param-name>encoding</param-name>             <param-value>GBK</param-value>         </init-param>         <init-param>             <param-name>ignore</param-name>             <param-value>true</param-value>         </init-param>     </filter>     <filter-mapping>         <filter-name>encodeFilter</filter-name>         <url-pattern>*.jsp</url-pattern>     </filter-mapping>     <filter-mapping>         <filter-name>encodeFilter</filter-name>         <url-pattern>*.do</url-pattern>     </filter-mapping>     <filter-mapping>         <filter-name>encodeFilter</filter-name>         <url-pattern>/*</url-pattern>     </filter-mapping>

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