如何使用SpringBoot拦截器实现登录拦截

小编给大家分享一下如何使用SpringBoot拦截器实现登录拦截，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

可以对URL路径进行拦截，可以用于权限验证、解决乱码、操作日志记录、性能监控、异常处理等

实现代码

新建 interceptor包

添加拦截器代码

package com.qcby.interceptor; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.method.HandlerMethod;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; public class LoginInterceptor  implements HandlerInterceptor {     @Autowired    private HttpSession httpSession;    //Controller逻辑执行之前    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {        System.out.println("preHandle....");        String uri = request.getRequestURI();        System.out.println("当前路径"+uri);         /**         * HandlerMethod=>Controller中标注@RequestMapping的方法         *  需要配置静态资源不拦截时，添加这块逻辑  => 前后端分离项目         */        if (!(handler instanceof HandlerMethod)) {            return true;        }        if (httpSession.getAttribute("username") == null) {            // 未登录跳转到登录界面            throw  new RuntimeException("no login!");        } else {            return true;        }    }     //Controller逻辑执行完毕但是视图解析器还未进行解析之前    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {        System.out.println("postHandle....");    }     //Controller逻辑和视图解析器执行完毕    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {        System.out.println("afterCompletion....");    }}

注册，配置拦截路径和排除登录需访问路径

package com.qcby.config; import com.qcby.interceptor.LoginInterceptor;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; @Configurationpublic class WebMvcConfig implements WebMvcConfigurer {     @Override    public void addInterceptors(InterceptorRegistry registry) {        registry.addInterceptor(loginInterceptor())                .addPathPatterns("/**")                // 那些路径不拦截                .excludePathPatterns("/user/login","/error");    }     @Bean    public LoginInterceptor loginInterceptor(){        return new LoginInterceptor();    }}

实现类

@RestController@RequestMapping("user")public class UserController {@Autowired    private UserService userService;    @Autowired    private HttpSession session;    @ApiOperation("用户登录接口")    @RequestMapping(value="login",method = {RequestMethod.GET,RequestMethod.POST})    public Maplogin(User user){        Map map=new HashMap<>();        map.put("code",0);        if(StringUtils.isEmpty(user.getUsername())||StringUtils.isEmpty(user.getPassword())){            map.put("msg","用户或密码为空！");            return map;        }        QueryWrapper queryWrapper=new QueryWrapper<>();        queryWrapper.eq("username",user.getUsername())                .eq("password",user.getPassword());        User user1=userService.getOne(queryWrapper);        if(user1!=null){            map.put("cod",1);            map.put("data",user1);            session.setAttribute("username",user1.getUsername());        }else {            map.put("msg","用户名或密码错误!");        }        return map;    }}

当我们未登录时我们不能进入拦截的页面

登录

登录之后我们就能进入hello方法了

以上是"如何使用SpringBoot拦截器实现登录拦截"这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注行业资讯频道！