springmvc拦截器

HandlerInterceptorAdapter

1,定义拦截器类

package testweb;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class LoginInterceptor extends HandlerInterceptorAdapter {
    private static final Logger log = LoggerFactory.getLogger(LoginInterceptor.class);

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        //do
        return true;
    }
    
}

2,配置xml

<mvc:interceptors>
        <mvc:interceptor>
            <mvc:exclude-mapping path="/js/**" />
            <!--******-->
            <mvc:exclude-mapping path="/logout" />
            <bean class="testweb.LoginInterceptor" />
        </mvc:interceptor>
        <mvc:interceptor>
           <mvc:exclude-mapping path="/js/**" />
            <!--******-->
            <mvc:exclude-mapping path="/logout" />
            <bean class="com.github.miemiedev.mybatis.paginator.springmvc.PageListAttrHandlerInterceptor" />
        </mvc:interceptor>
    </mvc:interceptors>

 3.拓展

@参考文章

spring为我们提供了org.springframework.web.servlet.handler.HandlerInterceptorAdapter这个适配器，继承此类，可以非常方便的实现自己的拦截器。他有三个方法：

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)    
            throws Exception {    
            return true;    
        }    
        public void postHandle(    
                HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)    
                throws Exception {    
        }    
        public void afterCompletion(    
                HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)    
                throws Exception {    
        }    


分别实现预处理、后处理（调用了Service并返回ModelAndView，但未进行页面渲染）、返回处理（已经渲染了页面）
在preHandle中，可以进行编码、安全控制等处理；
在postHandle中，有机会修改ModelAndView；
在afterCompletion中，可以根据ex是否为null判断是否发生了异常，进行日志记录。