checkfilter.java

主要包括有消息的发布、删除、查看消息、查看消息内容、还有一些用户的注册、登录等采用的是struts+hibernate开发

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;

public class CheckFilter implements Filter {

	public void destroy() {
		

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain filterChain) throws IOException, ServletException {
		   HttpServletRequest requests = (HttpServletRequest)request;
		   HttpServletResponse responses = (HttpServletResponse)response;
		   Object ob = requests.getSession().getAttribute("user");
		   
		   if(ob==null) {
			String url = requests.getContextPath();
			   responses.sendRedirect(  url+"/login.jsp");
			   //request.getRequestDispatcher("/login.jsp").forward(request, response);
		   }
        filterChain.doFilter(request, response);
	}

	public void init(FilterConfig arg0) throws ServletException {
		

	}

}