Java登录过滤器

1、package common;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 LoginFilter implements Filter {protected FilterConfig filterConfig;public void destroy() {filterConfig = null;}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {String enabled = filterConfig.getInitParameter("enabled");if ("false".equals(enabled)) {chain.doFilter(request, response);} else {HttpServletRequest req = (HttpServletRequest) request;HttpSession session = req.getSession(false);if (session == null || session.getAttribute("userBean") == null) {String keywords = filterConfig.getInitParameter("keywords");String uri = req.getRequestURI();if (!CommonUtil.contains(uri, keywords.split(";"))) {chain.doFilter(request, response);return;}String ignored = filterConfig.getInitParameter("ignored");if (CommonUtil.contains(uri, ignored.split(";"))) {chain.doFilter(request, response);return;}String input = filterConfig.getInitParameter("input");HttpServletResponse resp = (HttpServletResponse) response;resp.sendRedirect(input);} else {chain.doFilter(request, response);}}}public void init(FilterConfig fConfig) throws ServletException {filterConfig = fConfig;}}

2、<?xml version="1.0" encoding="UTF-8"?><web-app id="WebApp_ID" version="2.4"xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"><display-name>WebApp</display-name><filter><filter-name>loginFilter</filter-name><filter-class>common.LoginFilter</filter-class><init-param><param-name>keywords</param-name><param-value>.do;.jsp;.html;.htm</param-value></init-param><init-param><param-name>ignored</param-name><param-value>logon.do;login.jsp</param-value></init-param><init-param><param-name>input</param-name><param-value>login.jsp</param-value></init-param><init-param><param-name>enabled</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>loginFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><servlet><servlet-name>action</servlet-name><servlet-class>org.apache.struts.action.ActionServlet</servlet-class><init-param><param-name>config</param-name><param-value>/WEB-INF/struts-config.xml</param-value></init-param><init-param><param-name>debug</param-name><param-value>2</param-value></init-param><init-param><param-name>detail</param-name><param-value>2</param-value></init-param><load-on-startup>2</load-on-startup></servlet><servlet-mapping><servlet-name>action</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.jsp</welcome-file></welcome-file-list></web-app> 

3、package common;public class CommonUtil {public static boolean contains(String container, String[] regex) {for (String str : regex) {if (container.contains(str)) {return true;}}return false;}public static boolean contains(String[] container, String regex) {for (String str : container) {if (str.equals(regex)) {return true;}}return false;}}