springboot拦截器实例

记录现在的拦截器的写法：

首先，写一个拦截器:

package com.fan.interceptor;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,
                             Object handler) throws Exception {
        if (request.getSession().getAttribute("user") == null) {
            response.sendRedirect("/admin");
            return false;
        }

        return true;
    }
}

然后，写一个配置类：

package com.fan.interceptor;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor())
                .addPathPatterns("/admin/**")
                .excludePathPatterns("/admin")
                .excludePathPatterns("/admin/login");
    }
}

这个拦截器的作用是拦截所有admin下的请求，但是要将/admin请求和/admin/login请求给排除在外