<fileter>   <!-- 類名 -->   <filter-name>SetCharsetEncodingFilter</filter-name>   <!-- 類的路徑 -->   <filter-class>SetCharacter</filter-class>   <init-param>     <param-name>encoding</param-name>     <param-value>utf-8</param-value>   </init-param>   <filter-mapping>     <filter-name>SetCharsetEncodingFilter</filter-name>     <!-- 設(shè)置所有的文件遇到過(guò)濾器都要被攔截 -->     <url-pattern>/*</url-pattern>   </filter-mapping> </fileter> 

import java.io.IOException;  import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse;  public class SetCharacter implements Filter {   protected String encoding = null;   protected FilterConfig filterConfig = null;   protected boolean ignore = true;   public void init(FilterConfig arg0) throws ServletException {     this.encoding = arg0.getInitParameter("encoding");     String value = arg0.getInitParameter("imnore");     if (value == null) {       this.ignore = true;     } else if (value.equalsIgnoreCase("true")) {       this.ignore = true;     } else if (value.equalsIgnoreCase("yes")) {       this.ignore = true;     }   }    public void doFilter(ServletRequest arg0, ServletResponse arg1,       FilterChain arg2) throws IOException, ServletException {     if (ignore || (arg0.getCharacterEncoding() == null)) {       String encoding = selectEncoding(arg0);       if (encoding != null)         arg0.setCharacterEncoding(encoding);     }     arg2.doFilter(arg0, arg1);   }    private String selectEncoding(ServletRequest arg0) {     return (this.encoding);   }    public void destroy() {     this.encoding = null;     this.filterConfig = null;   }  }