基于注解实现 SpringBoot 接口防刷的方法

该示例项目通过自定义注解，实现接口访问次数控制，从而实现接口防刷功能，项目结构如下：

package cn.mygweb.annotation;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/** * 访问控制注解（实现接口防刷功能） */@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface AccessLimit { /** * 限制周期（单位为秒） * * @return */ int seconds(); /** * 规定周期内限制次数 * * @return */ int maxCount(); /** * 是否需要登录 * * @return */ boolean needLogin() default false;}二、在Interceptor拦截器中实现拦截逻辑

package cn.mygweb.interceptor;import cn.mygweb.annotation.AccessLimit;import cn.mygweb.entity.Result;import cn.mygweb.entity.StatusCode;import com.alibaba.fastjson.JSON;import org.springframework.stereotype.Component;import org.springframework.web.method.HandlerMethod;import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.OutputStream;import java.util.HashMap;import java.util.Map;/** * 访问控制拦截器 */@Componentpublic class AccessLimitInterceptor extends HandlerInterceptorAdapter { //模拟数据存储，实际业务中可以自定义实现方式 private static Map<String, AccessInfo> accessInfoMap = new HashMap<>(); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //判断请求是否属于方法的请求 if (handler instanceof HandlerMethod) { HandlerMethod hm = (HandlerMethod) handler; //获取方法中的注解，看是否有该注解 AccessLimit accessLimit = hm.getMethodAnnotation(AccessLimit.class); if (accessLimit == null) {return true; } int seconds = accessLimit.seconds(); int maxCount = accessLimit.maxCount(); boolean needLogin = accessLimit.needLogin(); String key = request.getRequestURI(); //如果需要登录 if (needLogin) {//获取登录的session进行判断//……key += ' ' + 'userA';//这里假设用户是userA，实际项目中可以改为userId } //模拟从redis中获取数据 AccessInfo accessInfo = accessInfoMap.get(key); if (accessInfo == null) {//第一次访问accessInfo = new AccessInfo();accessInfo.setFirstVisitTimestamp(System.currentTimeMillis());accessInfo.setAccessCount(1);accessInfoMap.put(key, accessInfo); } else if (accessInfo.getAccessCount() < maxCount) {//访问次数加1accessInfo.setAccessCount(accessInfo.getAccessCount() + 1);accessInfoMap.put(key, accessInfo); } else {//超出访问次数，判断时间是否超出设定时间if ((System.currentTimeMillis() - accessInfo.getFirstVisitTimestamp()) <= seconds * 1000) { //如果还在设定时间内，则为不合法请求，返回错误信息 render(response, '达到访问限制次数，请稍后重试！'); return false;} else { //如果超出设定时间，则为合理的请求，将之前的请求清空，重新计数 accessInfo.setFirstVisitTimestamp(System.currentTimeMillis()); accessInfo.setAccessCount(1); accessInfoMap.put(key, accessInfo);} } } return true; } /** * 向页面发送消息 * * @param response * @param msg * @throws Exception */ private void render(HttpServletResponse response, String msg) throws Exception { response.setContentType('application/json;charset=UTF-8'); OutputStream out = response.getOutputStream(); String str = JSON.toJSONString(new Result(true, StatusCode.ACCESSERROR, msg)); out.write(str.getBytes('UTF-8')); out.flush(); out.close(); } /** * 封装的访问信息对象 */ class AccessInfo { /** * 一个计数周期内第一次访问的时间戳 */ private long firstVisitTimestamp; /** * 访问次数统计 */ private int accessCount; public long getFirstVisitTimestamp() { return firstVisitTimestamp; } public void setFirstVisitTimestamp(long firstVisitTimestamp) { this.firstVisitTimestamp = firstVisitTimestamp; } public int getAccessCount() { return accessCount; } public void setAccessCount(int accessCount) { this.accessCount = accessCount; } @Override public String toString() { return 'AccessInfo{' + 'firstVisitTimestamp=' + firstVisitTimestamp + ', accessCount=' + accessCount + ’}’; } }}三、把Interceptor注册到springboot中

package cn.mygweb.config;import cn.mygweb.interceptor.AccessLimitInterceptor;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;/** * 拦截器注册配置 */@Configurationpublic class WebConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { //注册拦截器 registry.addInterceptor(new AccessLimitInterceptor()); }}四、在Controller中加入注解实现接口防刷

package cn.mygweb.controller;import cn.mygweb.annotation.AccessLimit;import cn.mygweb.entity.Result;import cn.mygweb.entity.StatusCode;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RequestMapping('/access')public class AccessController { @AccessLimit(seconds = 5, maxCount = 2)//访问控制，5秒内只能访问2次 @GetMapping public Result access() { return new Result(true, StatusCode.OK, '访问成功！'); }}五、测试访问

StatusCode类

package cn.mygweb.entity;/** * 返回状态码 */public class StatusCode { public static final int OK = 20000;//成功 public static final int ERROR = 20001;//失败 public static final int LOGINERROR = 20002;//用户名或密码错误 public static final int ACCESSERROR = 20003;//权限不足 public static final int REMOTEERROR = 20004;//远程调用失败 public static final int REPERROR = 20005;//重复操作 public static final int NOTFOUNDERROR = 20006;//没有对应的抢购数据}

Result类：

package cn.mygweb.entity;import java.io.Serializable;/** * 响应结果 */public class Result<T> implements Serializable { private boolean flag;//是否成功 private Integer code;//返回码 private String message;//返回消息 private T data;//返回数据 public Result(boolean flag, Integer code, String message, Object data) { this.flag = flag; this.code = code; this.message = message; this.data = (T) data; } public Result(boolean flag, Integer code, String message) { this.flag = flag; this.code = code; this.message = message; } public Result() { this.flag = true; this.code = StatusCode.OK; this.message = '操作成功!'; } public boolean isFlag() { return flag; } public void setFlag(boolean flag) { this.flag = flag; } public Integer getCode() { return code; } public void setCode(Integer code) { this.code = code; } public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } public T getData() { return data; } public void setData(T data) { this.data = data; }}

applications.yml:

server: port: 8080

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