storefilter.java

Java购物车及JSTL的应用

package org.qhit.li.store.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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class StoreFilter extends HttpServlet implements Filter {

	/**
	 * 
	 */
	private static final long serialVersionUID = 5;

	private FilterConfig filterConfig;

	private String coding;

	public StoreFilter() {
		coding = "";
	}

	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
		request.setCharacterEncoding(coding);
		response.setCharacterEncoding(coding);
		chain.doFilter(req, res);
	}

	public void init(FilterConfig filterconfig) throws ServletException {
		this.filterConfig = filterconfig;
		coding = this.filterConfig.getInitParameter("encoding");
	}
}