filter完成统一验证

web.xml配置

<filter>
		<filter-name>AuthFilter</filter-name>
		<filter-class>com.hugui.drp.util.filter.AuthFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>AuthFilter</filter-name>
		<url-pattern>*.jsp</url-pattern>
	</filter-mapping>
	
	<filter-mapping>
		<filter-name>AuthFilter</filter-name>
		<url-pattern>/servlet/*</url-pattern>
	</filter-mapping>

AuthFilter.java

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;
import javax.servlet.http.HttpSession;

public class AuthFilter implements Filter {

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

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse  resp = (HttpServletResponse)response;
		System.out.println(req.getRequestURI());
		System.out.println(req.getRequestURL());
		String requestURI = req.getRequestURI().substring(req.getRequestURI().indexOf("/", 1), req.getRequestURI().length());
		if(!"/login.jsp".equals(requestURI)){
			//如果session没登录
			HttpSession session = req.getSession(false);
			if(session == null || session.getAttribute("user_info") == null){
				resp.sendRedirect(req.getContextPath() + "/login.jsp");
				return ;
			}
		}
		//继续访问其他资源
		chain.doFilter(req, resp);
		

	}

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

	}

}