接口重复提交解决方案
/**
* 防止重复提交的注解
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
public @interface AvoidRepeatSubmit {
long lockTime() default 1000;
}
import com.mushi.anno.AvoidRepeatSubmit;
import com.mushi.config.ResultGenerator;
import com.mushi.redis.service.RedisDistributedLock;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.UUID;
/**
* 防止重复提交的切面
*/
@Aspect
@Component
@Slf4j
public class RepeatSubmitAspect {
@Autowired
private RedisDistributedLock redisDistributedLock;
/**
* 切点
*
* @param avoidRepeatSubmit
*/
@Pointcut("@annotation(avoidRepeatSubmit)")
public void pointCut(AvoidRepeatSubmit avoidRepeatSubmit) {
}
/**
* 利用环绕通知进行处理重复提交问题
*
* @param pjp
* @param avoidRepeatSubmit
* @return
* @throws Throwable
*/
@Around("pointCut(avoidRepeatSubmit)")
public Object around(ProceedingJoinPoint pjp, AvoidRepeatSubmit avoidRepeatSubmit) throws Throwable {
/**
* 获取锁的时间
*/
long lockSeconds = avoidRepeatSubmit.lockTime();
//获得request对象
HttpServletRequest request = httpServletRequest();
Assert.notNull(request, "request can not null");
// 此处可以用token或者JSessionId
String token = request.getHeader("token");
String path = request.getServletPath();
String key = getKey(token, path);
String clientId = getClientId();
//锁定多少秒
boolean isSuccess = redisDistributedLock.setLock(key, clientId, lockSeconds);
if (isSuccess) {
log.info("tryLock success, key = [{}], clientId = [{}]", key, clientId);
// 获取锁成功, 执行进程
Object result;
try {
result = pjp.proceed();
} finally {
//解锁
redisDistributedLock.releaseLock(key, clientId);
log.info("releaseLock success, key = [{}], clientId = [{}]", key, clientId);
}
return result;
} else {
// 获取锁失败，认为是重复提交的请求
log.info("tryLock fail, key = [{}]", key);
return ResultGenerator.genRepeatSubmitResult("重复请求，请稍后再试");
}
}
/**
* 获得request对象
*
* @return
*/
private HttpServletRequest httpServletRequest() {
ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
return requestAttributes.getRequest();
}
/**
* 获得请求key
*
* @param token
* @param path
* @return
*/
private String getKey(String token, String path) {
return token + path;
}
/**
* 获得uuid
*
* @return
*/
private String getClientId() {
return UUID.randomUUID().toString();
}
}
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisCluster;
import redis.clients.jedis.JedisCommands;
import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;
@Component
public class RedisDistributedLock {
@Resource
private RedisTemplate<String, Object> redisTemplate;
public static final String UNLOCK_LUA;
static {
StringBuilder sb = new StringBuilder();
sb.append("if redis.call(\"get\",KEYS[1]) == ARGV[1] ");
sb.append("then ");
sb.append(" return redis.call(\"del\",KEYS[1]) ");
sb.append("else ");
sb.append(" return 0 ");
sb.append("end ");
UNLOCK_LUA = sb.toString();
}
private final Logger logger = LoggerFactory.getLogger(RedisDistributedLock.class);
public boolean setLock(String key, String clientId, long expire) {
try {
RedisCallback<String> callback = (connection) -> {
JedisCommands commands = (JedisCommands) connection.getNativeConnection();
return commands.set(key, clientId, "NX", "PX", expire);
};
String result = redisTemplate.execute(callback);
return !StringUtils.isEmpty(result);
} catch (Exception e) {
logger.error("set redis occured an exception", e);
}
return false;
}
public String get(String key) {
try {
RedisCallback<String> callback = (connection) -> {
JedisCommands commands = (JedisCommands) connection.getNativeConnection();
return commands.get(key);
};
String result = redisTemplate.execute(callback);
return result;
} catch (Exception e) {
logger.error("get redis occured an exception", e);
}
return "";
}
public boolean releaseLock(String key, String requestId) {
// 释放锁的时候，有可能因为持锁之后方法执行时间大于锁的有效期，此时有可能已经被另外一个线程持有锁，所以不能直接删除
try {
List<String> keys = new ArrayList<>();
keys.add(key);
List<String> args = new ArrayList<>();
args.add(requestId);
// 使用lua脚本删除redis中匹配value的key，可以避免由于方法执行时间过长而redis锁自动过期失效的时候误删其他线程的锁
// spring自带的执行脚本方法中，集群模式直接抛出不支持执行脚本的异常，所以只能拿到原redis的connection来执行脚本
RedisCallback<Long> callback = (connection) -> {
Object nativeConnection = connection.getNativeConnection();
// 集群模式和单机模式虽然执行脚本的方法一样，但是没有共同的接口，所以只能分开执行
// 集群模式
if (nativeConnection instanceof JedisCluster) {
return (Long) ((JedisCluster) nativeConnection).eval(UNLOCK_LUA, keys, args);
}
// 单机模式
else if (nativeConnection instanceof Jedis) {
return (Long) ((Jedis) nativeConnection).eval(UNLOCK_LUA, keys, args);
}
return 0L;
};
Long result = redisTemplate.execute(callback);
return result != null && result > 0;
} catch (Exception e) {
logger.error("release lock occured an exception", e);
} finally {
// 清除掉ThreadLocal中的数据，避免内存溢出
//lockFlag.remove();
}
return false;
}
}
然后再需要接口防重的接口上加上AvoidRepeatSubmit注解
