简单的springboot限流
1. 定义注解
// AccessLimit.java
import java.lang.annotation.*;
@Inherited
@Documented
@Target({ElementType.FIELD,ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface AccessLimit {
//标识指定sec时间段内的访问次数限制
int limit() default 5;
/
/标识时间段
int sec() default 5;
}
2. 定义
// AccessLimitInterceptor.java
import org.RedisTemplate;
import org.hod.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.annotation.Resource;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import flect.Method;
import urrent.TimeUnit;
public class AccessLimitInterceptor implements HandlerInterceptor {
//使⽤RedisTemplate操作redis
@Resource
private RedisTemplate<String,Integer> redisTemplate;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {        if (handler instanceof HandlerMethod) {
HandlerMethod handlerMethod = (HandlerMethod) handler;
Method method = Method();
if (!method.isAnnotationPresent(AccessLimit.class)) {
return true;
}
AccessLimit accessLimit = Annotation(AccessLimit.class);
if (accessLimit == null) {
return true;
}
int limit = accessLimit.limit();
int sec = accessLimit.sec();
springboot和过滤器
String key = IpAddr(request) + RequestURI();
Integer maxLimit = redisTemplate.opsForValue().get(key);
if (maxLimit == null) {
//set时⼀定要加过期时间
redisTemplate.opsForValue().set(key, 1, sec, TimeUnit.SECONDS);
} else if (maxLimit < limit) {
redisTemplate.opsForValue().set(key, maxLimit + 1, sec, TimeUnit.SECONDS);
} else {
output(response, "请求太频繁!");
}
}
return true;
}
public void output(HttpServletResponse response, String msg) throws IOException {
response.setContentType("application/json;charset=UTF-8");
ServletOutputStream outputStream = null;
try {
outputStream = OutputStream();
outputStream.Bytes("UTF-8"));
} catch (IOException e) {
e.printStackTrace();
} finally {
outputStream.flush();
outputStream.close();
}
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {    }
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}
3. 加上注解
@AccessLimit(limit = 5,sec = 24*60*60)    // ⼀⽇五次
@RequestMapping(value = "/verify", method = {RequestMethod.POST, RequestMethod.GET})
public void verify() throws ServletException, IOException {
service.verify();
}
参考⽂档：
blog.csdn/fanrenxiang/article/details/80683378

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