// filter-class 为写的过滤器类   

　　　　实现  Filter 接口

    <filter>

        <filter-name>EncodeFilter</filter-name>

        <filter-class>com.gxxy.filter.EncodeFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>EncodeFilter</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>
    

public class EncodeFilter implements Filter {

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

            throws IOException, ServletException {

        // 将服务器的响应编码格式设置为UTF-8

        response.setContentType("text/html;charset=utf-8");

        // 浏览器请求服务器过滤乱码

        request.setCharacterEncoding("utf-8");     //只需要这一句代码即可,不需要下面注释的那样写

        /*Iterator<String[]> iterator = request.getParameterMap().values().iterator();

        while (iterator.hasNext()) {

            String[] strings = (String[]) iterator.next();

            int length = strings.length;

            for (int i = 0; i < length; i++) {

                strings[i] = new String(strings[i].getBytes("iso-8859-1"), "UTF-8");

            }

        }*/

        chain.doFilter(request, response);

    }

}