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    ¹ýÂËÆ÷FilterÒ²¾ßÓÐÉúÃüÖÜÆÚ£ºinit()->doFilter()->destroy()£¬Óɲ¿ÊðÎļþÖеÄfilterÔªËØÇý¶¯¡£ÔÚservlet2.4ÖУ¬¹ýÂËÆ÷ͬÑù¿ÉÒÔÓÃÓÚÇëÇó·ÖÅÉÆ÷£¬µ«ÐëÔÚweb.xmlÖÐÉùÃ÷£¬<dispatcher>INCLUDE»òFORWARD»òREQUEST»òERROR</dispatcher>¸ÃÔªËØÎ»ÓÚfilter-mappingÖС£
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public class EncodingFilter implements Filter {   
  
    private String encoding = null;   
  
    public void destroy() {   
         encoding = null;   
     }   
  
    public void doFilter(ServletRequest request, ServletResponse response,   
             FilterChain chain) throws IOException, ServletException {   
         String encoding = getEncoding();   
        if (encoding == null){   
             encoding = "gb2312";   
         }   
         request.setCharacterEncoding(encoding);// ÔÚÇëÇóÀïÉèÖÃÉÏÖ¸¶¨µÄ±àÂë   
         chain.doFilter(request, response);   
     }   
  
    public void init(FilterConfig filterConfig) throws ServletException {   
        this.encoding = filterConfig.getInitParameter("encoding");   
     }   
  
    private String getEncoding() {   
    &nbs


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