www.pudn.com > shopping.rar > IPFilter.java

package com.bjsxt.shopping.util.filter; 
 
import java.io.IOException; 
import java.io.PrintWriter; 
 
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 IPFilter implements Filter { 
	 
	FilterConfig fc = null; 
	 
	public void destroy() { 
		System.out.println("IPFilter destroy"); 
	} 
 
	public void doFilter(ServletRequest req, ServletResponse resp, 
			FilterChain chain) throws IOException, ServletException { 
		//System.out.println("IPFilter dofilter"); 
		String ip = req.getRemoteAddr(); 
		String strIPBlackList = fc.getInitParameter("IPBlackList"); 
		if(strIPBlackList.indexOf(ip) != -1) { 
			PrintWriter out = resp.getWriter(); 
			out.println("Your IP is not welcome!"); 
			return; 
		} 
		chain.doFilter(req, resp); 
	} 
 
	public void init(FilterConfig fc) throws ServletException { 
		System.out.println("IPFilter init"); 
		this.fc = fc; 
	} 
 
}