Spring Boot如何防止重复提交

场景：同一个用户在2秒内对同一URL的提交视为重复提交。

思考逻辑：

1.从数据库方面考虑，数据设计的时候，某些数据有没有唯一性，如果有唯一性，要考虑设置唯一索引，可以避免脏数据。

2.从应用层面考虑，首先判断是单机服务还是分布式服务，则此时需要考虑一些缓存，利用缓存，来保证数据的重复提交。

假设是分布式应用，则可以将用户的信息，例如token和请求的url进行组装在一起，存储到缓存存，例如redis,并设置超时时间为2秒，如此来保证数据的唯一性。

以下是代码实现：

Application.java

package com;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 

@SpringBootApplication
public class Application {
  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}

application.yml

spring:
 redis:
  host: 127.0.0.1
  port: 6379
  password: 123456

RedisConfig.java

package com.common;
 
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.jedis.JedisClientConfiguration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
 
@Configuration
 
public class RedisConfig {
  @Bean
  @ConfigurationProperties(prefix = "spring.redis")
  public JedisConnectionFactory getConnectionFactory() {
    return new JedisConnectionFactory(new RedisStandaloneConfiguration(), JedisClientConfiguration.builder().build());
  }
 
  @Bean
   RedisTemplate getRedisTemplate() {
    RedisTemplate redisTemplate = new RedisTemplate();
    redisTemplate.setConnectionFactory(getConnectionFactory());
    return redisTemplate;
  }
 
}

自定义注解NoRepeatSubmit.java

package com.common;
 
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
 
@Target(ElementType.METHOD) // 作用到方法上
@Retention(RetentionPolicy.RUNTIME) // 运行时有效

public @interface NoRepeatSubmit {
}

aop解析注解NoRepeatSubmitAop.java

package com.common;
 
import javax.servlet.http.HttpServletRequest;
 
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
 
@Aspect
@Component

public class NoRepeatSubmitAop {
 
  private Log logger = LogFactory.getLog(getClass());
 
  @Autowired
  private RedisTemplate template;
 
  @Around("execution(* com.example..*Controller.*(..)) && @annotation(nrs)")
  public Object arround(ProceedingJoinPoint pjp, NoRepeatSubmit nrs) {
    ValueOperations opsForValue = template.opsForValue();
    try {
      ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
      String sessionId = RequestContextHolder.getRequestAttributes().getSessionId();
      HttpServletRequest request = attributes.getRequest();
      String key = sessionId + "-" + request.getServletPath();
      if (opsForValue.get(key) == null) {// 如果缓存中有这个url视为重复提交
 Object o = pjp.proceed();
 opsForValue.set(key, 0, 2, TimeUnit.SECONDS);
 return o;
      } else {
 logger.error("重复提交");
 return null;
      }
    } catch (Throwable e) {
      e.printStackTrace();
      logger.error("验证重复提交时出现未知异常!");
      return "{"code":-889,"message":"验证重复提交时出现未知异常!"}";
    }
 
  }
 
}

测试类：

package com.example;
 
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
import com.common.NoRepeatSubmit;
 

@RestController
public class TestController {
  @RequestMapping("/test")
  @NoRepeatSubmit
  public String test() {
    return ("程序逻辑返回");
  }
 
}

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