知识点·JavaMVC拦截器(瑞吉外卖项目)

一、创建一个EmployeeIntercepto自定义拦截器类，实现HandlerInterceptor接口

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

@Slf4j
@Component
public class EmployeeInterceptor implements HandlerInterceptor {

   //重写preHandle方法
   
}

二、在EmployeeIntercepto自定义拦截器类重写preHandle方法

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

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

@Slf4j
@Component
public class EmployeeInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("本次请求的地址 {}",request.getRequestURI());
        if (request.getSession().getAttribute("Employee")!=null){
            return true;
        }
        return false;
    }
}

三、创建InterceptorConfiguration拦截器配置类

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

@Configuration
public class InterceptorConfiguration implements WebMvcConfigurer {

       //重新addInterceptors方法
    
}

四、在InterceptorConfiguration拦截器配置类重写addInterceptors方法

import com.itheima.fliter.EmployeeInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class InterceptorConfiguration implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration registration = registry.addInterceptor(new EmployeeInterceptor());
        
        registration.addPathPatterns("/**");//设置拦截的路径

        registration.excludePathPatterns(  //设置不拦截的路径
                "/backend/**",
                "/employee/login");
    }
}