过滤器文件：
package filter;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
public class CharacterEncoding
??? implements Filter {
? protected FilterConfig filterConfig = null;
? private String encoding=null;
? public void destroy() {
??? filterConfig = null;
??? encoding=null;
? }
? public void doFilter(ServletRequest request, ServletResponse response,
?????????????????????? FilterChain chain) throws IOException, ServletException {
??? HttpServletRequest req = (HttpServletRequest) request;
??? String s = req.getRequestURI();
??? String url = URLDecoder.decode(s, "UTF-8");//当IE中Intertnet选项->高级选项->总是以UTF-8发送URL 被选中时。
??? int k=url.indexOf("?");
??? String file=(k==-1?url:url.substring(0,k));
??? File f = new File(filterConfig.getServletContext().getRealPath(file));
??? if (f.exists() == false) {
????? url = new String(s.getBytes("ISO-8859-1"), encoding);//以UTF-8发送URL 未被选中时
????? url = URLDecoder.decode(url, encoding);
??? }
??? filterConfig.getServletContext().getRequestDispatcher(url).forward(req,
??????? response);
? }
? public void init(FilterConfig filterConfig) throws ServletException {
??? this.filterConfig = filterConfig;
??? encoding = filterConfig.getInitParameter("encoding");
? }
}
以上用于JDK1.4，如果用的是JDK1.3，请在上面代码中加入以下方法，并将URLEncoder.decode(...)改成decode(...)：
? public static String decode(String s, String enc) throws
????? UnsupportedEncodingException {
??? boolean needToChange = false;
??? StringBuffer sb = new StringBuffer();
??? int numChars = s.length();
??? int i = 0;
??? if (enc.length() == 0) {
????? throw new UnsupportedEncodingException(
????????? "URLDecoder: empty string enc parameter");
??? }
??? while (i < numChars) {
????? char c = s.charAt(i);
????? switch (c) {
??????? case '+':
????????? sb.append(' ');
????????? i++;
????????? needToChange = true;
????????? break;
??????? case '%':
????????? try {
??????????? byte[] bytes = new byte[ (numChars - i) / 3];
??????????? int pos = 0;
??????????? while ( ( (i + 2) < numChars) &&
?????????????????? (c == '%')) {
????????????? bytes[pos++] =
????????????????? (byte) Integer.parseInt(s.substring(i + 1, i + 3),
????????????????????????????????????????? 16);
????????????? i += 3;
????????????? if (i < numChars) {
??????????????? c = s.charAt(i);
????????????? }
??????????? }
??????????? if ( (i < numChars) && (c == '%')) {
????????????? throw new IllegalArgumentException(
????????????????? "URLDecoder: Incomplete trailing escape (%) pattern");
??????????? }
??????????? sb.append(new String(bytes, 0, pos, enc));
????????? }
????????? catch (NumberFormatException e) {
??????????? throw new IllegalArgumentException(
??????????????? "URLDecoder: Illegal hex characters in escape (%) pattern - "
??????????????? + e.getMessage());
????????? }
????????? needToChange = true;
????????? break;
??????? default:
????????? sb.append(c);
????????? i++;
????????? break;
????? }
??? }
??? return (needToChange ? sb.toString() : s);
? }
另外，还要在web.xml文件加入
??
?
??? CharacterEncoding
??? filter.CharacterEncoding
???
????? encoding
????? GBK
???
?
?
??? CharacterEncoding
??? /*
?
? 
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