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场景:同一个用户在n秒内对同一URL的提交视为重复提交。
在传统的web项目中,为了防止重复提交,通常做法是:后端生成唯一的提交令牌(token),存储在服务端,页面在发起请求时,携带次令牌,后端验证请求后删除令牌,保证请求的唯一性。
但是,上述的做法是需要前后端都需要进行改动,如果在项目初期,是可以实现的,但是,在项目的后期,很多功能都实现好了,不可能大范围的去改动。
pom.xml
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> <exclusions> <exclusion> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> </exclusion> <exclusion> <groupId>io.lettuce</groupId> <artifactId>lettuce-core</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency>
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配置文件
# Redis数据库索引(默认为0) spring.redis.database=0 # Redis服务器地址 spring.redis.host=localhost # Redis服务器连接端口 spring.redis.port=6379 # Redis服务器连接密码(默认为空) #spring.redis.password=yourpwd # 连接池最大连接数(使用负值表示没有限制) spring.redis.jedis.pool.max-active=8 # 连接池最大阻塞等待时间 spring.redis.jedis.pool.max-wait=-1ms # 连接池中的最大空闲连接 spring.redis.jedis.pool.max-idle=8 # 连接池中的最小空闲连接 spring.redis.jedis.pool.min-idle=0 # 连接超时时间(毫秒) spring.redis.timeout=5000ms
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自定义注解
import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) public @interface NoRepeatSubmit { /** * 设置请求锁定时间 * * @return */ int lockTime() default 10; }
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AOP
import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Pointcut; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.stereotype.Component; import org.springframework.util.Assert; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import javax.servlet.http.HttpServletRequest; import java.util.concurrent.TimeUnit; @Aspect @Component public class NoRepeatSubmitAop { @Autowired private StringRedisTemplate redisTemplate; @Pointcut("@annotation(noRepeatSubmit)") public void pointCut(NoRepeatSubmit noRepeatSubmit) { } @Around("pointCut(noRepeatSubmit)") public Object around(ProceedingJoinPoint pjp, NoRepeatSubmit noRepeatSubmit) throws Throwable { int lockSeconds = noRepeatSubmit.lockTime(); ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); HttpServletRequest request = attributes.getRequest(); Assert.notNull(request, "请求不能为空!"); String sessionId = RequestContextHolder.getRequestAttributes().getSessionId(); String path = request.getServletPath(); String key = sessionId + "-" + path; // 如果缓存中有这个url视为重复提交 if (!redisTemplate.hasKey(key)) { Object o = pjp.proceed(); redisTemplate.opsForValue().set(key, String.valueOf(0), lockSeconds, TimeUnit.SECONDS); return o; } else { return "重复请求,请稍后再试!"; } } }
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测试接口
import cn.com.javakf.aop.NoRepeatSubmit; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class SubmitController { @GetMapping("submit") @NoRepeatSubmit(lockTime = 5) public String submit() { return "请求成功!"; } }
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测试
http://localhost:8080/submit
token方式:https://www.bilibili.com/read/cv5639326/
Redis分布式锁:https://blog.csdn.net/a992795427/article/details/92834286
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