httpfilter.java

利用servlet写的用户注册登陆

package com.tarena.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;

public abstract class HttpFilter implements Filter {
	private FilterConfig config;

	public void destroy() {
	}

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

	public abstract void doFilter(HttpServletRequest request,
			HttpServletResponse response, FilterChain chain)
			throws IOException, ServletException;

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

	public void init() throws ServletException {
	}

	public String getInitParameter(String name) {
		return config.getInitParameter(name);
	}

	public FilterConfig getFitlerConfig() {
		return config;
	}

}