服务器端实现方案:同一客户端在2秒内对同一URL的提交视为重复提交

上代码吧

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>springboot-repeat-submit</artifactId>
    <version>1.0</version>
    <packaging>jar</packaging>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>24.0-jre</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

Application.java

package com;

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

/**
 * @author www.gaozz.club
 * @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);
    }
}

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.gaozz.club
 * @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.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import com.google.common.cache.Cache;

@Aspect
@Component
/**
 * @功能描述 aop解析注解
 * @author www.gaozz.club
 * @date 2018-08-26
 */
public class NoRepeatSubmitAop {

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

    @Autowired
    private Cache<String, Integer> cache;

    @Around("execution(* com.example..*Controller.*(..)) && @annotation(nrs)")
    public Object arround(ProceedingJoinPoint pjp, NoRepeatSubmit nrs) {
        try {
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            String sessionId = RequestContextHolder.getRequestAttributes().getSessionId();
            HttpServletRequest request = attributes.getRequest();
            String key = sessionId + "-" + request.getServletPath();
            if (cache.getIfPresent(key) == null) {// 如果缓存中有这个url视为重复提交
                Object o = pjp.proceed();
                cache.put(key, 0);
                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!\"}";
        }

    }

}

缓存类

package com.common;

import java.util.concurrent.TimeUnit;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;

@Configuration
/**
 * @功能描述 内存缓存
 * @author www.gaozz.club
 * @date 2018-08-26
 */
public class UrlCache {
    @Bean
    public Cache<String, Integer> getCache() {
        return CacheBuilder.newBuilder().expireAfterWrite(2L, TimeUnit.SECONDS).build();// 缓存有效期为2秒
    }
}

测试Controller

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.gaozz.club
 * @date 2018-08-26
 */
@RestController
public class TestController {
    @RequestMapping("/test")
    @NoRepeatSubmit
    public String test() {
        return ("程序逻辑返回");
    }

}

浏览器输入http://localhost:8080/test

然后F5刷新查看效果

QQ图片20180914165017.png

以下为新版内容:解决了程序集群部署时请求可能会落到多台机器上的问题,把内存缓存换成了redis

application.yml

spring:
  redis:
    host: 192.168.1.92
    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;
    }

}

调整切面类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!\"}";
        }

    }

}

转自https://www.jianshu.com/p/09c6b05b670a

原文地址：https://www.cnblogs.com/cangqinglang/p/11659873.html