在web.xml声明的一个filter中:
<!– session过滤filter –> <filter> <filter-name>SessionFilter</filter-name> <filter-class> com.iqbon.jcms.web.util.SessionFilter </filter-class> <init-param> <param-name>excludedPages</param-name> <param-value>/admin/login.do</param-value> </init-param> </filter> <filter-mapping> <filter-name>SessionFilter</filter-name> <url-pattern>/admin/*</url-pattern> </filter-mapping>
可以看到url-pattern的设置里面过滤的url规则是/admin/*,如果要把/admin/login.do排除在过滤url之外。
可以结合init-param的初始化参数和HttpServletRequest的getServletPath()方法来判断。
首先加上初始化参数:
<init-param> <param-name>excludedPages</param-name> <param-value>/admin/login.do</param-value> </init-param>
其次在filter的java代码中加上判断:
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; import org.apache.commons.lang3.StringUtils; import com.iqbon.jcms.util.KeyConstant; /** * session过滤器 */ public class SessionFilter implements Filter { /** * 需要排除的页面 */ private String excludedPages; private String[] excludedPageArray; /** * @see Filter#destroy() */ public void destroy() { return; } /** * 对session进行判断当前访问是否有登录 */ public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { boolean isExcludedPage = false; for (String page : excludedPageArray) {//判断是否在过滤url之外 if(((HttpServletRequest) request).getServletPath().equals(page)){ isExcludedPage = true; break; } } if (isExcludedPage) {//在过滤url之外 chain.doFilter(request, response); } else {//不在过滤url之外,判断session是否存在 HttpSession session = ((HttpServletRequest) request).getSession(); if (session == null || session.getAttribute(KeyConstant.SESSION_KEY_USER) == null) { ((HttpServletResponse) response).sendRedirect(“/login.htm”); } else { chain.doFilter(request, response); } } } /** * 初始化函数,获取需要排除在外的url */ public void init(FilterConfig fConfig) throws ServletException { excludedPages = fConfig.getInitParameter(“excludedPages”); if (StringUtils.isNotEmpty(excludedPages)) { excludedPageArray = excludedPages.split(“,”); } return; } }