shuizhonglu1990的专栏

1. 过滤的路径要有统一的可以表示的路径，以方便模块化过滤

例如：用户模块：/user/*，信息模块：/info/*

2. 过滤器要有能排除不过滤路径的功能；

3. 实现相关的业务需要；

import java.io.IOException;import java.util.ArrayList;import java.util.List;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;import org.apache.log4j.Logger;import org.springframework.util.StringUtils;import com.dbdata.constant.DBDataConstants;public class LoginFilter implements Filter {private static final Logger logger = Logger.getLogger(LoginFilter.class);public LoginFilter() {}@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {HttpServletRequest req = (HttpServletRequest) request;HttpSession session = req.getSession();HttpServletResponse resp = (HttpServletResponse) response;String url = req.getRequestURI();logger.info("url:" + url);//不需要过滤的链接List<String> excludeLinks = new ArrayList<String>();excludeLinks.add("/dbdatamanage/admin/login/valid");if (!excludeLinks.contains(url)) {String user_name = (String) session.getAttribute(DBDataConstants.USER_NAME);String user_id = (String) session.getAttribute(DBDataConstants.USER_ID);logger.info("user_name:" + user_name);logger.info("user_id:" + user_id);if (StringUtils.isEmpty(user_name) || StringUtils.isEmpty(user_id)) {resp.sendRedirect(req.getContextPath() + "/jhub/login.jsp");return;}}chain.doFilter(request, response);}@Overridepublic void destroy() {}}

，如你想要拥有完美无暇的友谊，可能一辈子找不到朋友