1. 利用AOP技术实现

2. 编写切面类Delay：代码如下

package com.foxconn.core.AccessLimitAPI;

import org.springframework.stereotype.Component;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**

• @author wdy
• @date 2023-10-20
  */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Component
  public @interface Delay {
  //默认两秒，意思是每个方法两秒内只能请求一次，重复请求无效
  int time() default 2000; }

3. 服务器IP获取工具类

package com.foxconn.core.AccessLimitAPI;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**

• @author wdy
• @date 2023-10-20
  */
  public class CommontMethod {

/**

• 获取请求ip
• @param request
• @return
  /
  public static String getIpAddr(HttpServletRequest request){
  String ipAddress = request.getHeader("x-forwarded-for");
  if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
  ipAddress = request.getHeader("Proxy-Client-IP");
  }
  if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
  ipAddress = request.getHeader("WL-Proxy-Client-IP");
  }
  if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
  ipAddress = request.getRemoteAddr();
  if("127.0.0.1".equals(ipAddress) || "0:0:0:0:0:0:0:1".equals(ipAddress)){
  //根据网卡取本机配置的IP
  InetAddress inet=null;
  try {
  inet = InetAddress.getLocalHost();
  } catch (UnknownHostException e) {
  e.printStackTrace();
  }
  ipAddress= inet.getHostAddress();
  }
  }
  //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
  if(ipAddress!=null && ipAddress.length()>15){ //"...*".length() = 15
  if(ipAddress.indexOf(",")>0){
  ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));
  }
  }
  return ipAddress;
  }

}

4. 定义全局统一请求拦截 filter（RequestFrequenceInterceptor） ，实现HandlerInterceptor

package com.foxconn.core.AccessLimitAPI;

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.commons.nullanalysis.Nullable;
import org.mybatis.logging.Logger;
import org.mybatis.logging.LoggerFactory;
import org.springframework.stereotype.Component;
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 java.util.HashMap;
import java.util.Map;
import java.util.function.Supplier;

/**

• @author wdy
• @date 2023-10-20
  */
  @Component
  public class RequestFrequenceInterceptor implements HandlerInterceptor {
  private final Log log = LogFactory.getLog(RequestFrequenceInterceptor.class);
  private long lastTime = 0;
  private boolean startDelay(int time) {
  long currentTime = System.currentTimeMillis();
  if (currentTime - lastTime > time) {
  System.out.println(currentTime + " - " + lastTime);
  lastTime = currentTime;
  return true;
  }

return false;
}
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

String ip = CommontMethod.getIpAddr( request );//获取ip地址
//开始进入请求地址拦截
//获取执行方法上的注解 不过滤静态资源
if(handler instanceof HandlerMethod){
HandlerMethod hm = (HandlerMethod) handler;
//对包含注解的方法进行频率验证
Delay delay = hm.getMethodAnnotation(Delay.class);
if (delay != null) {
if ( startDelay(delay.time()))
{
return true;
}else {
log.info("ip: "+ ip+"-请求被锁定,频率过快");
String msg="ip["+ ip+"],请求频率过快,服务将被锁定！请"+delay.time()/1000+"s后，请重试！";
Map<String,Object> responseMap = new HashMap<>( );
responseMap.put( "code",10021 );
responseMap.put( "message",msg);
String resStr = JSON.toJSONString(responseMap);
response.setContentType("application/json;charset=utf-8");
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Cache-Control","no-cache");
response.getWriter().write(resStr);

return false;
}
}
}

// 对于不包含注解的方法一律放行
return true;

}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
//处理请求完成后紧接着的操作
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
//视图渲染之后的操作
}
}

5. 定义全局统一请求拦截配置 RequestParamInterceptorConf类

package com.foxconn.core.AccessLimitAPI;

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;

/**

• @author wdy
• @date 2023-10-20
  */
  @Configuration
  public class RequestParamInterceptorConf implements WebMvcConfigurer {
  @Autowired
  RequestFrequenceInterceptor frequenceInterceptor;
  @Override
  public void addInterceptors(InterceptorRegistry registry){
  // 多个拦截器组成一个拦截器链
  // addPathPatterns 用于添加拦截规则
  // excludePathPatterns 用户排除拦截
  // TokenInterceptor()为自己定义的拦截器
  registry.addInterceptor( frequenceInterceptor ).addPathPatterns( "/**" ).excludePathPatterns("/error");
  }
  }