kenter1643

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 {
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<servlet>
		<servlet-name>action</servlet-name>
		<servlet-class>
			org.apache.struts.action.ActionServlet
		</servlet-class>
		<init-param>
			<param-name>config</param-name>
			<param-value>/WEB-INF/struts-config.xml</param-value>
		</init-param>
		<init-param>
			<param-name>debug</param-name>
			<param-value>3</param-value>
		</init-param>
		<init-param>
			<param-name>detail</param-name>
			<param-value>3</param-value>
		</init-param>
		<load-on-startup>0</load-on-startup>
	</servlet>

	<filter>
		<filter-name>TomcatFormFilter</filter-name>
		<filter-class>filters.TomcatFormFilter</filter-class>
	</filter>

	<filter-mapping>
		<filter-name>TomcatFormFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<servlet-mapping>
		<servlet-name>action</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
</web-app>