springboot中如何防止重复提交，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

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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

4.0.0 com.example springboot-repeat-submit 1.0 jar  org.springframework.boot  spring-boot-starter-parent  2.0.4.RELEASE    UTF-8  UTF-8  1.8     org.springframework.boot   spring-boot-starter-web       org.springframework.boot   spring-boot-starter-aop       com.google.guava   guava   24.0-jre          org.springframework.boot    spring-boot-maven-plugin    

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 */@SpringBootApplicationpublic 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 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 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 */@RestControllerpublic 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

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;@Configurationpublic 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; }}

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 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!\"}";  } }}

看完上述内容，你们掌握springboot中如何防止重复提交的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！

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