filter如何设置例外的请求
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;}}
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