springboot 过滤器和拦截器用法

过滤器用法

package org.example.filter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@Component
public class LogFilter implements Filter {

    private static final Logger log = LoggerFactory.getLogger(LogFilter.class);

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest ;
        log.info("------------- LogFilter 开始 -------------");
        log.info("请求地址: {} {}",request.getRequestURL().toString(),request.getMethod());
        log.info("远程地址: {}",request.getRemoteAddr());
        long startTime = System.currentTimeMillis() ;
        filterChain.doFilter(servletRequest,servletResponse);
        log.info("------------- LogFilter 结束 耗时：{} ms -------------",System.currentTimeMillis()-startTime);

    }

    @Override
    public void destroy() {

    }
}

拦截器用法

package org.example.interceptor;

import org.example.bilili.exception.BusinessException;
import org.example.bilili.util.IpUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Arrays;
import java.util.List;


public class PassportInterceptor implements HandlerInterceptor {

    private static final Logger log = LoggerFactory.getLogger(PassportInterceptor.class);

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String ip = IpUtil.getIP(request);
        log.info("当前IP:[{}]",ip);
        List blackIpList = Arrays.asList("192.168.0.1","192.168.0.2","127.0.0.1");
        if(blackIpList.contains(ip)){
            log.info("黑名单...");
            throw new BusinessException("非法IP");
        }
        return true ;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
    }
}

package org.example.config;

import org.example.interceptor.PassportInterceptor;
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;

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Bean
    public PassportInterceptor passportInterceptor(){
        return new PassportInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(passportInterceptor())
                .addPathPatterns("/hello/demo-ip");
    }
}