代码如下：

/** * 编码过滤器 */package com.filter;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.HttpServletResponse;/** * @author Admin * */public class EncodingFilter implements Filter {		private FilterConfig filterConfig = null;	private String targetEncoding = "UTF-8";//默认系统过滤编码	private boolean isEnabled = true;//是否启用编码过滤		/**	 * 编码过滤	 */	public void doFilter(ServletRequest request, ServletResponse response,			FilterChain chain) throws IOException, ServletException {		if (this.isEnabled) {// 使用编码过滤			HttpServletRequest req = (HttpServletRequest) request;			HttpServletResponse res = (HttpServletResponse) response;			req.setCharacterEncoding(targetEncoding);			res.setCharacterEncoding(targetEncoding);		}		chain.doFilter(request, response);	}	/**	 * 过滤器初始化	 */	public void init(FilterConfig config) throws ServletException {		this.filterConfig = config;		String encoding = filterConfig.getInitParameter("Encoding").trim();		this.targetEncoding = encoding.equals("")?this.targetEncoding:encoding;		this.isEnabled = Boolean.valueOf(filterConfig.getInitParameter("Enabled"));	}		public EncodingFilter() {	}	public void destroy() {	}}

web.xml配置：

    	
    		
     
      EncodingFilter
     		
     
      EncodingFilter
     		
     
      com.map.pgis.popu.filter.EncodingFilter
     		
     			
      
       过滤字符编码
      			
      
       Encoding
      			
      
       UTF-8
      		
     		
     			
      
       是否启用编码过滤器
      			
      
       Enabled
      			
      
       true
      		
     	
    		
    		
     
      EncodingFilter
     		
     
      /EncodingFilter
     	
    	
    		
     
      EncodingFilter
     		
     
      /*