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;

/**
 * @author www.spring.tsh
 * @功能描述 防重复提交
 * @date 2018-08-26
 */
@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
  <K, V> RedisTemplate<K, V> getRedisTemplate() {
    RedisTemplate<K, V> redisTemplate = new RedisTemplate<K, V>();
    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
/**
 * @功能描述 防止重复提交标记注解
 * @author www.srping.tsh
 * @date 2018-08-26
 */
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
/**
 * @功能描述 aop解析注解
 * @author www.gaozz.club
 * @date 2018-11-02
 */
public class NoRepeatSubmitAop {

  private Log logger = LogFactory.getLog(getClass());

  @Autowired
  private RedisTemplate<String, Integer> template;

  @Around("execution(* com.example..*Controller.*(..)) && @annotation(nrs)")
  public Object arround(ProceedingJoinPoint pjp, NoRepeatSubmit nrs) {
    ValueOperations<String, Integer> 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;

/**
 * @功能描述 测试Controller
 * @author www.spring.tsh
 * @date 2018-08-26
 */
@RestController
public class TestController {
  @RequestMapping("/test")
  @NoRepeatSubmit
  public String test() {
    return ("程序逻辑返回");
  }

}

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