SSM拦截器应用

1.创建工具包

2.编写拦截器业务逻辑类容（在此为验证登录效果）

@Override
    public void doFilter(ServletRequest req, ServletResponse res,
            FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        HttpServletRequest request=(HttpServletRequest)req;
        HttpSession session=request.getSession();//获取登录时存在session里面的值
        String name=(String)session.getAttribute("name");
        if(name!=null){
            chain.doFilter(req, res);//如果已登录则直接将请求传递给目标资源

        }else{
            req.getRequestDispatcher("Login.jsp").forward(req, res);//如果未登录，则返回登录界面
        }

    }

3.配置拦截器拦截范围

<filter>
<filter-name>checkLogin</filter-name>//拦截器名称
<filter-class>com.chinasoft.storemanagement.filter.CheckLogin</filter-class>//类所在全路径
</filter>
<filter-mapping>
<filter-name>checkLogin</filter-name>
     <url-pattern>/index.jsp</url-pattern>
     <url-pattern>/updatePassword.jsp</url-pattern>//选择需要拦截的文件地址
     <url-pattern>/ownInformation.mvc</url-pattern>
</filter-mapping>