Java代碼
package cn.edu.filter;
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 MyFilter implements Filter {
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request=(HttpServletRequest)req;
HttpServletResponse response=(HttpServletResponse)res;
HttpSession session=request.getSession();
Integer userId=(Integer)session.getAttribute("userId");
if(userId==null){
response.sendRedirect("/cms_01/login.jsp");
}else{
chain.doFilter(request, response);
}
}
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
同時在web.xml中添加如下配置
Xml代碼
<filter>
<filter-name>MyFilter</filter-name>
<filter-class>cn.edu.filter.MyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/admin/*</url-pattern>
</filter-mapping>
作者“helinhang”