fifter、servlet、interceptor
fifter用来处理请求头、请求参数、编码的一些设置，然后转交给servlet，处理业务，返回
servlet现在常用的spring,servlet拦截/到DispatcherServlet，交由spring管理
interceptor,servlet请求之后可以实现HandlerInterceptor做到preHandle、postHandle、afterCompletion在controller之前、之后、渲染之后
登陆
业务中常用的登陆、注册，大部分用cookie、session来做，这时候就涉及到拦截判断用户是否登陆、是否有权限？至此引出interceptor：
package com.bs.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import com.bs.controller.BaseController;
import com.bs.entity.Member;
public class LoginInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
Member member = BaseController.getMemberByCookie(request);
System.out.println(member);
if(member == null){
response.sendRedirect("/officialweb/login.html");
}
return false;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
// TODO Auto-generated method stub
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
// TODO Auto-generated method stub
}
}
java代码如上,然后在servlet.xml中配置如下：
<!-- 拦截器 -->
<!-- 多个拦截器，顺序执行 -->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<mvc:exclude-mapping path="/**/cloud/**" />
<mvc:exclude-mapping path="/**/login/**" />
<bean class="com.bs.interceptor.LoginInterceptor"></bean>
</mvc:interceptor>
</mvc:interceptors>
mvc:mapping拦截的path地址,mvc:exclude-mapping不拦截的path地址，比如一些登陆、注册、验证码、和可以不登录操作的接口。
至此结束。
