springmvc登录拦截jsp页面

web.xml配置

<filter>
　　<filter-name>LoginFilter</filter-name>

　　//编写拦截的类的全类名
　　<filter-class>cn.books.filter.LoginFilter</filter-class>
</filter>
<filter-mapping>
　　<filter-name>LoginFilter</filter-name>
　　<url-pattern>*.jsp</url-pattern>
</filter-mapping>

LoginFilter类

@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
/*拦截jsp页面*/
// TODO Auto-generated method stub
HttpServletRequest request1=(HttpServletRequest) request;
String currentURL=request1.getRequestURI();
String ctxPath=request1.getContextPath();

//targerURl是路径

String targetURL=currentURL.substring(ctxPath.length());
HttpSession sessionuser = request1.getSession();

//取到你存入httpsession中的数据
String user = (String) sessionuser.getAttribute("usersession");

//判断路径是否是/login.jsp或者/register.jsp如果是则放行继续执行
if(("/login.jsp").equals(targetURL)||("/register.jsp").equals(targetURL)) {
chain.doFilter(request, response);
}else if(!(user==null)){//判断用户是否登录
chain.doFilter(request, response);
}else if(("/").equals(targetURL)){//判断是否是第一次默认跳转页面
chain.doFilter(request, response);
}else {//如果以上情况都不是则跳回登录界面
((HttpServletResponse) response).sendRedirect("/books/login.jsp");
}