过滤器解决JSP中英文编码

1，在包下建过滤器

package com.lanou.filter;
    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;
    /**
     * 过滤器解决中文编码问题
     */
    public class CharacterEncodingFilter implements Filter {
        private FilterConfig config;
        private String encoding = "UTF-8";
        public void destroy() {
            config = null;
        }
        public void doFilter(ServletRequest request, ServletResponse response,
        FilterChain chain) throws IOException, ServletException {
            request.setCharacterEncoding(encoding);
            chain.doFilter(request, response);
        }
        public void init(FilterConfig config) throws ServletException {
            this.config = config;
            String s = config.getInitParameter("encoding");
            if (s != null) {
                encoding = s;
            }
        }
    }

2.配置web.xml

 <filter>
        <filter-name>encodingFilterfilter-name>

        <filter-class>com.lanou.filter.CharacterEncodingFilterfilter-class>

        <init-param>
            <param-name>encodingparam-name>
            <param-value>utf-8param-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>encodingFilterfilter-name>
        <url-pattern>/*url-pattern>
filter-mapping>