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filters
package filters;

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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class TomcatFormFilter implements Filter {
    /**
     * Request.java 对 HttpServletRequestWrapper 进行扩充, 不影响原来的功能并能提供所 有的
     * HttpServletRequest 接口中的功能. 它可以统一的对 Tomcat 默认设置下的中文问题进行解决而只 需要用新的 Request
     * 对象替换页面中的 request 对象即可.
     */
    class Request extends HttpServletRequestWrapper {
        public Request(HttpServletRequest request) {
            super(request);
        }

        /**
         * 转换由表单读取的数据的内码. 从 ISO 字符转到 GBK.
         */
        public String toChi(String input) {
            try {
                byte[] bytes = input.getBytes("ISO8859-1");
                return new String(bytes, "GBK");
            } catch (Exception ex) {
            }
            return null;
        }

        /**
         * Return the HttpServletRequest holded by this object.
         */
        private HttpServletRequest getHttpServletRequest() {
            return (HttpServletRequest) super.getRequest();
        }

        /**
         * 读取参数 -- 修正了中文问题.
         */
        public String getParameter(String name) {
            return toChi(getHttpServletRequest().getParameter(name));
        }

        /**
         * 读取参数列表 - 修正了中文问题.
         **/
        public String[] getParameterValues(String name) {
            String values[] = getHttpServletRequest().getParameterValues(name);
            if (values != null) {
                for (int i = 0; i < values.length; i++) {
                    values[i] = toChi(values[i]);
                }
            }

            return values;
        }
    }

    public void destroy() {
    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpreq = (HttpServletRequest) request;
        if (httpreq.getMethod().equals("POST")) {
            request.setCharacterEncoding("GBK");
        } else {
            request = new Request(httpreq);
        }
        chain.doFilter(request, response);
    }

    public void init(FilterConfig filterConfig) throws ServletException {
        
    }
}
posted on 2008-07-03 13:39 QQ小妹 阅读(237) 评论(0)  编辑  收藏 所属分类: JAVA
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