一個(gè)注解搞定接口防刷！還有誰不會(huì)？
說明：使用了注解的方式進(jìn)行對(duì)接口防刷的功能，非常高大上，本文章僅供參考
一，技術(shù)要點(diǎn)：springboot的基本知識(shí)，redis基本操作，
首先是寫一個(gè)注解類：
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* @author yhq
* @date 2018/9/10 15:52
*/
@Retention(RUNTIME)
@Target(METHOD)
public @interface AccessLimit {
int seconds();
int maxCount();
boolean needLogin()default true;
}
接著就是在Interceptor攔截器中實(shí)現(xiàn)
import com.alibaba.fastjson.JSON;
import com.example.demo.action.AccessLimit;
import com.example.demo.redis.RedisService;
import com.example.demo.result.CodeMsg;
import com.example.demo.result.Result;
import org.springframework.beans.factory.annotation.Autowired;
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;
/**
* @author yhq
* @date 2018/9/10 16:05
*/
@Component
public class FangshuaInterceptor extends HandlerInterceptorAdapter {
@Autowired
private RedisService redisService;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//判斷請(qǐng)求是否屬于方法的請(qǐng)求
if(handler instanceof HandlerMethod){
HandlerMethod hm = (HandlerMethod) handler;
//獲取方法中的注解,看是否有該注解
AccessLimit accessLimit = hm.getMethodAnnotation(AccessLimit.class);
if(accessLimit == null){
return true;
}
int seconds = accessLimit.seconds();
int maxCount = accessLimit.maxCount();
boolean login = accessLimit.needLogin();
String key = request.getRequestURI();
//如果需要登錄
if(login){
//獲取登錄的session進(jìn)行判斷
//.....
key+=""+"1"; //這里假設(shè)用戶是1,項(xiàng)目中是動(dòng)態(tài)獲取的userId
}
//從redis中獲取用戶訪問的次數(shù)
AccessKey ak = AccessKey.withExpire(seconds);
Integer count = redisService.get(ak,key,Integer.class);
if(count == null){
//第一次訪問
redisService.set(ak,key,1);
}else if(count < maxCount){
//加1
redisService.incr(ak,key);
}else{
//超出訪問次數(shù)
render(response,CodeMsg.ACCESS_LIMIT_REACHED); //這里的CodeMsg是一個(gè)返回參數(shù)
return false;
}
}
return true;
}
private void render(HttpServletResponse response, CodeMsg cm)throws Exception {
response.setContentType("application/json;charset=UTF-8");
OutputStream out = response.getOutputStream();
String str = JSON.toJSONString(Result.error(cm));
out.write(str.getBytes("UTF-8"));
out.flush();
out.close();
}
}
再把Interceptor注冊(cè)到springboot中
import com.example.demo.ExceptionHander.FangshuaInterceptor;
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.WebMvcConfigurerAdapter;
/**
* @author yhq
* @date 2018/9/10 15:58
*/
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Autowired
private FangshuaInterceptor interceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(interceptor);
}
}
接著在Controller中加入注解
import com.example.demo.result.Result;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
/**
* @author yhq
* @date 2018/9/10 15:49
*/
@Controller
public class FangshuaController {
@AccessLimit(seconds=5, maxCount=5, needLogin=true)
@RequestMapping("/fangshua")
@ResponseBody
public Result fangshua() {
return Result.success("請(qǐng)求成功");
}評(píng)論
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