SpringMVC filter设置例外的请求

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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)) {  <span style="white-space:pre"></span>excludedPageArray = excludedPages.split(“,”);  }  return;  }    }

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