Springboot配置拦截器功能

原创已于 2023-06-13 09:25:01 修改 · 323 阅读

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#java

于 2023-05-24 17:15:36 首次发布

该文章展示了如何创建一个SpringMVC的登录拦截器，检查用户是否已登录。Interceptor名为LoginInterceptor，如果用户未登录，则重定向到登录页面。此拦截器被添加到Web配置中，应用到所有URL路径，但排除了登录判断、登录本身以及静态资源路径。

1、创建拦截器

 
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.websocket.Session;
 
public class LoginInterceptor implements HandlerInterceptor {
 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        Object reglister = session.getAttribute("Reglister");
 
 
        if (reglister != null) {
            return true;
        } else {
            request.setAttribute("msg", "请先登录!");
 
            request.getRequestDispatcher("/").forward(request,response);
            return false;
        }
    }
 
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }
 
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

2、将拦截器添加到容器中

 
import com.LoginInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.filter.HiddenHttpMethodFilter;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.util.UrlPathHelper;
 
 
@Configuration
public class WebConfig implements WebMvcConfigurer{
 
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/loginjudge","/login",,"/static/**");
    }
 
}