springboot拦截器的基本配置

1.拦截器
        

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

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

@Component  // 一定要加，让 Spring 管理这个类
public class AuthenticationInterceptor implements HandlerInterceptor {

这个方法是在调用接口前运行的    

@Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("进入拦截器 AuthenticationInterceptor");
        // 返回 true 表示继续执行，false 表示中断
        return true;
    }
}

2.配置类（用于注册拦截器）

import org.springframework.beans.factory.annotation.Autowired;
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 WebMvcConfiguration implements WebMvcConfigurer {

    @Autowired
    private AuthenticationInterceptor authenticationInterceptor;

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