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package com.htt;
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;
public class Encoding implements Filter {
    public void destroy() {  }
    public void doFilter(ServletRequest request, ServletResponse response,   FilterChain chain) throws IOException, ServletException {
           request.setCharacterEncoding("GBK");
           chain.doFilter(request, response);
    }
    public void init(FilterConfig filterConfig) throws ServletException { }
}
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<filter>
   <filter-name>encoding</filter-name>
   <filter-class>com.htt.Encoding</filter-class>
</filter>
<filter-mapping>
   <filter-name>encoding</filter-name>
   <url-pattern>/ToCh_zn</url-pattern>
</filter-mapping>
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