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");
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
