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import java.io.IOException;
import java.net.URLDecoder;
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;
public class UrlFilter implements Filter {
public final static String DEFAULT_URI_ENCODE = "UTF-8";
private FilterConfig config = null;
private String encode = null;
@Override
public void init(FilterConfig config) throws ServletException {
this.config = config;
this.encode = config.getInitParameter("DEFAULT_URI_ENCODE");
if(this.encode == null) {
this.encode = DEFAULT_URI_ENCODE;
}
}
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
String uri = request.getRequestURI();
String ch = URLDecoder.decode(uri, encode);
if(uri.equals(ch)) {
chain.doFilter(req, res);
return;
}
ch = ch.substring(request.getContextPath().length());
config.getServletContext().getRequestDispatcher(ch).forward(req, res);
}
@Override
public void destroy() {
config = null;
}
}
<filter>
<filter-name>urlFilter</filter-name>
<filter-class>com.test.UrlFilter</filter-class>
<init-param>
<param-name>DEFAULT_URI_ENCODE</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>urlFilter</filter-name>
<url-pattern>*.doc</url-pattern>
</filter-mapping>