/**
* 雪花id的工具类
*/
@Slf4j
public class SnowFlakeUtil {
private static long workerId = 0;
private static long datacenterId = 1;
private static Snowflake snowflake = IdUtil.getSnowflake(workerId,datacenterId);
@PostConstruct // 自动调用，在构造方法前做
public void init(){try {workerId = NetUtil.ipv4ToLong(NetUtil.getLocalhostStr());log.info("当前机器的workId:{}",workerId);}catch (Exception e){log.error("当前机器的workId获取失败",e);workerId = NetUtil.getLocalhostStr().hashCode();}
}public static synchronized long snowflakeId(){return snowflake.nextId();
}public static synchronized String snowflakeIdStr(){return String.valueOf(snowflake.nextId());
}public static void main(String[] args) {System.out.println(SnowFlakeUtil.snowflakeIdStr());
}
}
### 4.生成验证码流程：* 生成4位的验证码；
* 产生唯一的id，作为验证码的key；
* 以key，value的形式存储到redis中；
* 前端显示验证码图片；设置验证码的有效时间>
> // 3.redis中存储，key-value，设置有效时间为 60 s
> stringRedisTemplate.opsForValue().set(key,code,60,TimeUnit.SECONDS);
>
>
> package com.tianju.springboot.controller;
import cn.hutool.captcha.CaptchaUtil;
import cn.hutool.captcha.LineCaptcha;
import com.tianju.springboot.dto.HttpRespSimple;
import com.tianju.springboot.util.SnowFlakeUtil;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
/**
* 雪花id的调用，返回一张图片
*/
@RestController
@RequestMapping(“/api/user/code”)
public class CodeDemoController {
@Resource
private StringRedisTemplate stringRedisTemplate;@GetMapping("/snowcode.jpg")
public HttpRespSimple createCode(HttpServletResponse response) throws IOException {// 1.产生验证码LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(200, 100, 4, 10);String code = lineCaptcha.getCode();// 2.产生唯一的值，作为key，用雪花id作为唯一的keyString key = SnowFlakeUtil.snowflakeIdStr(); // 生成雪花id，string类型的// 3.redis中存储，key-value，设置有效时间为 60 sstringRedisTemplate.opsForValue().set(key,code,60,TimeUnit.SECONDS);// 4.返回给浏览器cookieresponse.addCookie(new Cookie("vc", key));// 5.显示到前端lineCaptcha.write(response.getOutputStream());System.out.println(">>>>>>>>>>>>验证码为："+code);return new HttpRespSimple(20001, "验证码创建成功");
}@GetMapping("/inputcode")
public HttpRespSimple inputCode(HttpServletRequest request){for (Cookie cookie: request.getCookies()) {if (cookie.getName().equals("vc")){String key = cookie.getValue();System.out.println("从redis取出存入的验证码："+stringRedisTemplate.opsForValue().get(key));if (Objects.isNull(stringRedisTemplate.opsForValue().get(key))){return new HttpRespSimple(40001, "验证码无效");}else {return new HttpRespSimple(20002, "验证码成功");}}}return new HttpRespSimple(20003, "验证码不存在");
}
}
#### 前端显示
### 5.JMeter测试验证码生成**1）新建线程组****2）设置参数****3）添加取样器****4）设置参数：协议，ip，端口，请求方式，路径****5）添加查看结果树****6）启动+查看结果**## JMeter### 什么是JMeter?>
> Apache JMeter™
>
>
> The **Apache JMeter™** application is open source software, a 100% pure Java application designed to load test functional behavior and measure performance（接口性能）,It was originally designed for testing Web Applications but has since expanded to other test functions.
>
>
> ### JMeter安装配置#### 1.官网下载#### 2.下载后解压#### 3.汉语设置## JMeter的使用方法### 1.新建线程组### 2.设置参数### 3.添加取样器### 4.设置参数：协议，ip，端口，请求方式，路径### 5.添加查看结果树
