SpringMVC filter设置例外的请求

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;  
}  
  
}