SpringBoot使用拦截器无效

最新推荐文章于 2024-07-23 22:47:21 发布

转载最新推荐文章于 2024-07-23 22:47:21 发布 · 114 阅读

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原文链接：http://www.cnblogs.com/lchzls/p/6684750.html

本文详细介绍了如何在Spring MVC项目中正确配置拦截器，并通过具体案例解决了一个因忘记添加@Component注解而导致拦截器未生效的问题。

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附上代码：

public class WendaWebConfiguration extends WebMvcConfigurerAdapter {

    @Autowired
    PassportInterceptor passportInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(passportInterceptor);
        super.addInterceptors(registry);
    }
}

@Component
public class PassportInterceptor implements HandlerInterceptor{

    private static final Logger logger = LoggerFactory.getLogger(PassportInterceptor.class);
    @Autowired
    private LoginTicketDAO loginTicketDAO;

    @Autowired
    private UserDAO userDAO;

    @Autowired
    private HostHolder hostHolder;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        String ticket = null;
        for(Cookie cookie: httpServletRequest.getCookies()){
            if("ticket".equals(cookie.getName())){
                ticket = cookie.getValue();
                break;
            }
        }
        if (ticket != null) {
            LoginTicket loginTicket = loginTicketDAO.selectByTicket(ticket);
            if (loginTicket == null || loginTicket.getExpired().before(new Date()) || loginTicket.getStatus() != 0) {
                return true;
            }

            User user = userDAO.selectById(loginTicket.getUserId());
            logger.info("user:"+user.getName());

            hostHolder.setUser(user);
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        if(modelAndView!=null&&hostHolder.getUser()!=null){
            modelAndView.addObject("user",hostHolder.getUser());
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        hostHolder.clear();
    }
}header.html:

#if(!$user)
<ul class="topnav-noauth clearfix">
    <li>
        <a href="/reglogin">注册/登陆</a>
    </li>
</ul>
#else
...

测试运行：

期望的结果是如下：

代码思想：

通过

WendaWebConfiguration注册拦截器PassportInterceptor,拦截器在渲染页面之前，会将user通过modelAndView保存，然后在header.html读取user的值。所以，既然登录成功，就应该

$user为真，因此，按理就不会出现测试结果。

解决方案：通过debug测试，找出在拦截器PassportInterceptor中，

logger.info("user:"+user.getName());
根本没有输出。因此，说明，整个项目根本没有使用拦截器，也就是拦截器配置出现了问题。但是，拦截器配置代码

WendaWebConfiguration中好像都OK，找不出哪里错了。最后，仔细分析，是以为忘记写组件@Component了。导致，无法启动拦截器配置。
修改如下：

@Component
public class WendaWebConfiguration extends WebMvcConfigurerAdapter {

    @Autowired
    PassportInterceptor passportInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(passportInterceptor);
        super.addInterceptors(registry);
    }
}
再次测试，结果为：