chuyunfilter.java

很好的东东 本人随便做的 仅供学习之用

package jhyy.login;

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 ChuYunFilter implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("gb2312");
		System.out.println("invoke");
		HttpServletRequest httpRequest = (HttpServletRequest) request;
		if ( null==httpRequest.getSession().getAttribute("name")) {
			HttpServletResponse resp=(HttpServletResponse)response;
			resp.sendRedirect(httpRequest.getContextPath()+"/login.jsp");
			return ;
		} else {
			chain.doFilter(request, response);
		}
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}