httpfilter.java

网上购物系统struts+spring+hibernate实现

package com.sdi0708.bdifn.bookstore.service.util;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 一个HttpFilter的超类
 * 
 * @author bdifn
 * 
 */
public abstract class HttpFilter implements Filter {

	private FilterConfig filterConfig;
	private ServletContext servletContext;

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
	}

	public void destroy() {
	}

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

	public abstract void doFilter(HttpServletRequest req,
			HttpServletResponse resp, FilterChain chain) throws IOException,
			ServletException;

	public String getInitParameter(String paramName) {
		return filterConfig.getInitParameter(paramName);
	}

	public FilterConfig getFilterConfig() {
		return filterConfig;
	}
	
	public ServletContext getServletContext() {
		return servletContext;
	}

}