基于 springboot+redis+lua 构建高并发秒杀系统的设计思路,本文将聚焦核心代码实现,从环境配置、库存预热、lua 脚本、秒杀接口到异步下单、限流防护,完整呈现可直接落地的代码方案,帮你快速搭建稳定高效的秒杀系统。
一、环境准备与依赖配置
1. 项目依赖(pom.xml)
首先在 springboot 项目中引入核心依赖,包括 redis、消息队列(以 rabbitmq 为例)、springboot 核心组件等:
<!-- springboot核心依赖 -->
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-web</artifactid>
</dependency>
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-data-redis</artifactid>
</dependency>
<!-- 消息队列(rabbitmq) -->
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-amqp</artifactid>
</dependency>
<!-- lua脚本支持 -->
<dependency>
<groupid>org.springframework.data</groupid>
<artifactid>spring-data-redis</artifactid>
<version>2.7.0</version>
</dependency>
<!-- 工具类 -->
<dependency>
<groupid>cn.hutool</groupid>
<artifactid>hutool-all</artifactid>
<version>5.8.11</version>
</dependency>
<!-- lombok -->
<dependency>
<groupid>org.projectlombok</groupid>
<artifactid>lombok</artifactid>
<optional>true</optional>
</dependency>
2. 核心配置(application.yml)
配置 redis、rabbitmq 连接信息,以及秒杀系统核心参数:
spring:
# redis配置
redis:
host: 127.0.0.1
port: 6379
password: 123456
database: 0
lettuce:
pool:
max-active: 16 # 最大连接数
max-idle: 8 # 最大空闲连接
min-idle: 4 # 最小空闲连接
# rabbitmq配置
rabbitmq:
host: 127.0.0.1
port: 5672
username: guest
password: guest
virtual-host: /
listener:
simple:
acknowledge-mode: manual # 手动ack确认
concurrency: 5 # 消费者并发数
# 秒杀系统配置
seckill:
redis:
stock-key-prefix: "seckill:goods:" # 商品库存key前缀
user-key-prefix: "seckill:goods:users:" # 已秒杀用户key前缀
rabbitmq:
queue-name: "seckill_order_queue" # 订单消息队列名
exchange-name: "seckill_order_exchange" # 订单交换机名
routing-key: "seckill.order" # 路由键
rate-limit:
qps: 1000 # 全局限流qps
二、核心工具类与常量定义
1. 秒杀常量类(seckillconstant)
统一管理 redis 键前缀、消息队列参数等常量,避免硬编码:
import lombok.allargsconstructor;
import lombok.getter;
/**
* 秒杀系统常量类
*/
@getter
@allargsconstructor
public class seckillconstant {
// redis键前缀
public static final string stock_key_prefix = "seckill:goods:";
public static final string user_key_prefix = "seckill:goods:users:";
public static final string request_id_key_prefix = "seckill:request:";
// 秒杀结果状态码
public static final int seckill_success = 1; // 秒杀成功
public static final int seckill_fail_stock = 0; // 库存不足
public static final int seckill_fail_repeat = 2; // 重复秒杀
// 消息队列参数
public static final string order_queue_name = "seckill_order_queue";
public static final string order_exchange_name = "seckill_order_exchange";
public static final string order_routing_key = "seckill.order";
}
2. redis 工具类(redistemplateconfig)
配置 redistemplate,支持 string、hash 等数据结构操作,以及 lua 脚本执行:
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.data.redis.connection.redisconnectionfactory;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.data.redis.serializer.genericjackson2jsonredisserializer;
import org.springframework.data.redis.serializer.stringredisserializer;
@configuration
public class redistemplateconfig {
@bean
public redistemplate<string, object> redistemplate(redisconnectionfactory factory) {
redistemplate<string, object> template = new redistemplate<>();
template.setconnectionfactory(factory);
// string序列化器
stringredisserializer stringserializer = new stringredisserializer();
// json序列化器
genericjackson2jsonredisserializer jsonserializer = new genericjackson2jsonredisserializer();
// key使用string序列化
template.setkeyserializer(stringserializer);
template.sethashkeyserializer(stringserializer);
// value使用json序列化
template.setvalueserializer(jsonserializer);
template.sethashvalueserializer(jsonserializer);
template.afterpropertiesset();
return template;
}
}
三、库存预热实现(活动前数据加载)
秒杀活动开始前,将商品库存、活动状态从数据库加载到 redis,避免活动中频繁访问数据库:
1. 商品实体类(goodsdto)
import lombok.data;
import java.math.bigdecimal;
import java.util.date;
/**
* 秒杀商品dto
*/
@data
public class goodsdto {
private long goodsid; // 商品id
private string goodsname; // 商品名称
private bigdecimal seckillprice; // 秒杀价格
private integer stock; // 秒杀库存
private date starttime; // 活动开始时间
private date endtime; // 活动结束时间
private integer status; // 活动状态:0-未开始,1-进行中,2-已结束
}
2. 库存预热服务(stockwarmupservice)
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.stereotype.service;
import java.util.hashmap;
import java.util.map;
/**
* 库存预热服务
*/
@service
public class stockwarmupservice {
@autowired
private redistemplate<string, object> redistemplate;
/**
* 预热单个商品库存到redis
*/
public void warmupgoodsstock(goodsdto goodsdto) {
if (goodsdto == null || goodsdto.getstock() <= 0) {
throw new illegalargumentexception("商品信息或库存无效");
}
// 1. 存储商品库存和状态(hash结构)
string stockkey = seckillconstant.stock_key_prefix + goodsdto.getgoodsid();
map<string, object> goodsmap = new hashmap<>();
goodsmap.put("stock", goodsdto.getstock());
goodsmap.put("status", goodsdto.getstatus());
goodsmap.put("starttime", goodsdto.getstarttime().gettime());
goodsmap.put("endtime", goodsdto.getendtime().gettime());
redistemplate.opsforhash().putall(stockkey, goodsmap);
// 2. 初始化已秒杀用户集合(set结构,用于去重)
string userkey = seckillconstant.user_key_prefix + goodsdto.getgoodsid();
redistemplate.opsforset().add(userkey, new object[]{}); // 初始化空集合
}
/**
* 批量预热商品库存(适用于多商品秒杀活动)
*/
public void batchwarmupgoodsstock(java.util.list<goodsdto> goodsdtolist) {
for (goodsdto goodsdto : goodsdtolist) {
warmupgoodsstock(goodsdto);
}
}
}
3. 定时预热触发(可选)
通过定时任务在活动开始前 10 分钟自动预热库存:
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.scheduling.annotation.scheduled;
import org.springframework.stereotype.component;
import java.util.list;
@component
public class seckillscheduledtask {
@autowired
private stockwarmupservice stockwarmupservice;
@autowired
private goodsmapper goodsmapper; // 自定义mapper,查询待秒杀商品
/**
* 每天00:00预热当天秒杀商品库存(可根据实际活动时间调整)
*/
@scheduled(cron = "0 0 0 * * ?")
public void scheduledwarmupstock() {
list<goodsdto> seckillgoods = goodsmapper.selecttodayseckillgoods();
stockwarmupservice.batchwarmupgoodsstock(seckillgoods);
}
}
四、核心:lua 脚本实现原子扣减库存
通过 lua 脚本将 “库存检查、重复秒杀拦截、库存扣减” 封装为原子操作,从根本上解决并发冲突:
1. lua 脚本文件(seckill_stock.lua)
在resources/lua目录下创建 lua 脚本:
-- 传入参数:keys[1] = 商品id,argv[1] = 用户id
local goodsid = keys[1]
local userid = argv[1]
-- 定义redis键
local stockkey = "seckill:goods:" .. goodsid
local userkey = "seckill:goods:users:" .. goodsid
-- 1. 检查商品活动状态和库存
local goodsstatus = redis.call("hget", stockkey, "status")
if goodsstatus ~= "1" then
return 3 -- 活动未开始或已结束
end
local stock = redis.call("hget", stockkey, "stock")
if not stock or tonumber(stock) <= 0 then
return 0 -- 库存不足
end
-- 2. 检查用户是否已秒杀(避免重复下单)
if redis.call("sismember", userkey, userid) == 1 then
return 2 -- 重复秒杀
end
-- 3. 原子扣减库存并记录用户
redis.call("hincrby", stockkey, "stock", -1)
redis.call("sadd", userkey, userid)
return 1 -- 秒杀成功
2. lua 脚本加载与执行服务(luascriptservice)
import org.springframework.core.io.classpathresource;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.data.redis.core.script.defaultredisscript;
import org.springframework.scripting.support.staticscriptsource;
import org.springframework.stereotype.service;
import javax.annotation.postconstruct;
import java.util.collections;
import java.util.list;
/**
* lua脚本执行服务
*/
@service
public class luascriptservice {
@autowired
private redistemplate<string, object> redistemplate;
private defaultredisscript<integer> seckillstockscript;
/**
* 初始化加载lua脚本
*/
@postconstruct
public void initluascript() {
seckillstockscript = new defaultredisscript<>();
// 加载脚本文件
seckillstockscript.setscriptsource(new staticscriptsource(
new classpathresource("lua/seckill_stock.lua").getcontentasstring()
));
// 设置返回值类型
seckillstockscript.setresulttype(integer.class);
}
/**
* 执行秒杀库存扣减脚本
*/
public integer executeseckillscript(long goodsid, long userid) {
list<string> keys = collections.singletonlist(goodsid.tostring());
// 执行脚本:keys=商品id,args=用户id
return redistemplate.execute(
seckillstockscript,
keys,
userid.tostring()
);
}
}
五、秒杀接口实现(含限流、防重复提交)
1. 限流注解与 aop 实现(ratelimitaspect)
基于 redis 实现分布式限流,拦截超 qps 请求:
import cn.hutool.core.util.strutil;
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.value;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.data.redis.core.script.defaultredisscript;
import org.springframework.stereotype.component;
import javax.annotation.postconstruct;
import java.util.collections;
/**
* 限流aop切面
*/
@aspect
@component
public class ratelimitaspect {
@autowired
private redistemplate<string, object> redistemplate;
@value("${seckill.rate-limit.qps}")
private int qps;
private defaultredisscript<long> ratelimitscript;
@postconstruct
public void initratelimitscript() {
// 令牌桶限流lua脚本
string script = "local key = keys[1]\n" +
"local now = tonumber(argv[1])\n" +
"local qps = tonumber(argv[2])\n" +
"local window = 1\n" + // 窗口时间1秒
"local maxtoken = qps\n" +
"local lasttime = redis.call('hget', key, 'lasttime')\n" +
"local tokencount = redis.call('hget', key, 'tokencount')\n" +
"if not lasttime or not tokencount then\n" +
" redis.call('hset', key, 'lasttime', now)\n" +
" redis.call('hset', key, 'tokencount', maxtoken - 1)\n" +
" redis.call('expire', key, window)\n" +
" return 1\n" +
"end\n" +
"local interval = now - tonumber(lasttime)\n" +
"local addtoken = math.floor(interval / 1000 * qps)\n" +
"tokencount = math.min(addtoken + tonumber(tokencount), maxtoken)\n" +
"if tokencount <= 0 then\n" +
" return 0\n" +
"end\n" +
"redis.call('hset', key, 'lasttime', now)\n" +
"redis.call('hset', key, 'tokencount', tokencount - 1)\n" +
"return 1";
ratelimitscript = new defaultredisscript<>(script, long.class);
}
// 定义限流注解切入点
@pointcut("@annotation(com.seckill.annotation.ratelimit)")
public void ratelimitpointcut() {}
@around("ratelimitpointcut()")
public object around(proceedingjoinpoint joinpoint) throws throwable {
string key = "seckill:rate:limit:global"; // 全局限流key(可扩展为ip/用户维度)
long now = system.currenttimemillis();
long result = redistemplate.execute(
ratelimitscript,
collections.singletonlist(key),
now.tostring(),
string.valueof(qps)
);
if (result == 1) {
return joinpoint.proceed(); // 获得令牌,执行方法
} else {
throw new runtimeexception("请求过于频繁,请稍后再试");
}
}
}
2. 防重复提交注解(repeatsubmit)
import java.lang.annotation.*;
@target(elementtype.method)
@retention(retentionpolicy.runtime)
@documented
public @interface repeatsubmit {
// 防重复提交过期时间(默认5秒)
int expireseconds() default 5;
}
3. 秒杀接口(seckillcontroller)
import cn.hutool.core.util.idutil;
import com.seckill.annotation.ratelimit;
import com.seckill.annotation.repeatsubmit;
import com.seckill.dto.seckillrequestdto;
import com.seckill.dto.seckillresponsedto;
import com.seckill.service.luascriptservice;
import com.seckill.service.ordermessageservice;
import com.seckill.service.stockwarmupservice;
import com.seckill.util.seckillconstant;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.web.bind.annotation.postmapping;
import org.springframework.web.bind.annotation.requestbody;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.restcontroller;
import javax.validation.valid;
import java.util.objects;
/**
* 秒杀接口
*/
@restcontroller
@requestmapping("/seckill")
public class seckillcontroller {
@autowired
private luascriptservice luascriptservice;
@autowired
private ordermessageservice ordermessageservice;
@autowired
private redistemplate<string, object> redistemplate;
/**
* 秒杀核心接口(含限流、防重复提交)
*/
@postmapping("/doseckill")
@ratelimit // 限流注解
@repeatsubmit(expireseconds = 5) // 防重复提交(5秒内同一请求id不可重复提交)
public seckillresponsedto doseckill(@valid @requestbody seckillrequestdto requestdto) {
long goodsid = requestdto.getgoodsid();
long userid = requestdto.getuserid();
string requestid = requestdto.getrequestid(); // 前端生成的唯一请求id
// 1. 防重复提交校验(基于redis缓存请求id)
string requestkey = seckillconstant.request_id_key_prefix + requestid;
boolean hasrequest = redistemplate.haskey(requestkey);
if (boolean.true.equals(hasrequest)) {
return seckillresponsedto.fail("请勿重复提交请求");
}
redistemplate.opsforvalue().set(requestkey, "1", 5); // 缓存5秒
try {
// 2. 执行lua脚本扣减库存
integer seckillresult = luascriptservice.executeseckillscript(goodsid, userid);
// 3. 处理秒杀结果
if (seckillconstant.seckill_success == seckillresult) {
// 秒杀成功,发送订单消息到消息队列
ordermessageservice.sendordermessage(goodsid, userid);
return seckillresponsedto.success("秒杀成功,正在创建订单...");
} else if (seckillconstant.seckill_fail_stock == seckillresult) {
return seckillresponsedto.fail("库存不足,秒杀失败");
} else if (seckillconstant.seckill_fail_repeat == seckillresult) {
return seckillresponsedto.fail("您已参与过该商品秒杀,请勿重复抢购");
} else {
return seckillresponsedto.fail("活动未开始或已结束");
}
} finally {
// 4. 移除防重复提交缓存(可选,根据业务需求调整)
redistemplate.delete(requestkey);
}
}
}
4. 秒杀请求 / 响应 dto
import lombok.data;
import javax.validation.constraints.notnull;
/**
* 秒杀请求dto
*/
@data
public class seckillrequestdto {
@notnull(message = "商品id不能为空")
private long goodsid;
@notnull(message = "用户id不能为空")
private long userid;
@notnull(message = "请求id不能为空")
private string requestid; // 前端生成的唯一请求id,用于防重复提交
}
/**
* 秒杀响应dto
*/
import lombok.allargsconstructor;
import lombok.data;
import lombok.noargsconstructor;
@data
@noargsconstructor
@allargsconstructor
public class seckillresponsedto {
private int code; // 响应码:0-失败,1-成功
private string message; // 响应消息
public static seckillresponsedto success(string message) {
return new seckillresponsedto(1, message);
}
public static seckillresponsedto fail(string message) {
return new seckillresponsedto(0, message);
}
}
六、消息队列异步下单实现
1. 订单消息实体(ordermessage)
import lombok.allargsconstructor;
import lombok.data;
import lombok.noargsconstructor;
import java.math.bigdecimal;
/**
* 订单消息实体
*/
@data
@noargsconstructor
@allargsconstructor
public class ordermessage {
private long orderid; // 订单id(可在消息发送时生成)
private long goodsid; // 商品id
private long userid; // 用户id
private bigdecimal seckillprice; // 秒杀价格
private long createtime; // 创建时间戳
}
2. 消息队列配置(rabbitmqconfig)
import org.springframework.amqp.core.binding;
import org.springframework.amqp.core.bindingbuilder;
import org.springframework.amqp.core.directexchange;
import org.springframework.amqp.core.queue;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
/**
* rabbitmq配置
*/
@configuration
public class rabbitmqconfig {
/**
* 声明订单队列
*/
@bean
public queue orderqueue() {
// 队列持久化
return new queue(seckillconstant.order_queue_name, true);
}
/**
* 声明订单交换机
*/
@bean
public directexchange orderexchange() {
return new directexchange(seckillconstant.order_exchange_name, true, false);
}
/**
* 绑定队列和交换机
*/
@bean
public binding orderbinding() {
return bindingbuilder.bind(orderqueue())
.to(orderexchange())
.with(seckillconstant.order_routing_key);
}
}
3. 订单消息发送服务(ordermessageservice)
import cn.hutool.core.util.idutil;
import com.seckill.dto.ordermessage;
import com.seckill.util.seckillconstant;
import org.springframework.amqp.rabbit.core.rabbittemplate;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.service;
import java.math.bigdecimal;
/**
* 订单消息发送服务
*/
@service
public class ordermessageservice {
@autowired
private rabbittemplate rabbittemplate;
/**
* 发送秒杀订单消息
*/
public void sendordermessage(long goodsid, long userid) {
// 生成订单id(雪花算法或uuid)
long orderid = idutil.getsnowflake().nextid();
// 构建订单消息
ordermessage ordermessage = new ordermessage();
ordermessage.setorderid(orderid);
ordermessage.setgoodsid(goodsid);
ordermessage.setuserid(userid);
ordermessage.setseckillprice(new bigdecimal("99.00")); // 示例秒杀价格
ordermessage.setcreatetime(system.currenttimemillis());
// 发送消息到rabbitmq
rabbittemplate.convertandsend(
seckillconstant.order_exchange_name,
seckillconstant.order_routing_key,
ordermessage
);
}
}
4. 订单消息消费服务(orderconsumerservice)
import com.rabbitmq.client.channel;
import com.seckill.dto.ordermessage;
import com.seckill.mapper.ordermapper;
import com.seckill.pojo.order;
import com.seckill.util.seckillconstant;
import org.springframework.amqp.core.message;
import org.springframework.amqp.rabbit.annotation.rabbitlistener;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.stereotype.service;
import java.io.ioexception;
/**
* 订单消息消费服务(异步创建订单)
*/
@service
public class orderconsumerservice {
@autowired
private ordermapper ordermapper;
@autowired
private redistemplate<string, object> redistemplate;
@rabbitlistener(queues = seckillconstant.order_queue_name)
public void consumeordermessage(ordermessage ordermessage, channel channel, message message) throws ioexception {
try {
// 1. 校验消息合法性
if (ordermessage == null || ordermessage.getgoodsid() == null || ordermessage.getuserid() == null) {
channel.basicnack(message.getmessageproperties().getdeliverytag(), false, false);
return;
}
// 2. 异步创建订单
order order = new order();
order.setorderid(ordermessage.getorderid());
order.setgoodsid(ordermessage.getgoodsid());
order.setuserid(ordermessage.getuserid());
order.setseckillprice(ordermessage.getseckillprice());
order.setcreatetime(ordermessage.getcreatetime());
order.setstatus(0); // 0-待支付
ordermapper.insert(order);
// 3. 手动ack确认消息
channel.basicack(message.getmessageproperties().getdeliverytag(), false);
} catch (exception e) {
// 4. 处理异常:消息重投或记录日志(根据业务需求调整)
channel.basicnack(message.getmessageproperties().getdeliverytag(), false, true);
// 回滚redis库存(补偿机制)
rollbackstock(ordermessage.getgoodsid());
}
}
/**
* 订单创建失败,回滚redis库存
*/
private void rollbackstock(long goodsid) {
string stockkey = seckillconstant.stock_key_prefix + goodsid;
redistemplate.opsforhash().increment(stockkey, "stock", 1);
}
}
七、防重复提交 aop 实现(repeatsubmitaspect)
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.data.redis.core.redistemplate;
import org.springframework.stereotype.component;
import com.seckill.annotation.repeatsubmit;
import com.seckill.dto.seckillrequestdto;
import java.util.objects;
import java.util.concurrent.timeunit;
/**
* 防重复提交aop切面
*/
@aspect
@component
public class repeatsubmitaspect {
@autowired
private redistemplate<string, object> redistemplate;
@pointcut("@annotation(repeatsubmit)")
public void repeatsubmitpointcut(repeatsubmit repeatsubmit) {}
@around("repeatsubmitpointcut(repeatsubmit)")
public object around(proceedingjoinpoint joinpoint, repeatsubmit repeatsubmit) throws throwable {
// 获取请求参数中的seckillrequestdto
object[] args = joinpoint.getargs();
seckillrequestdto requestdto = null;
for (object arg : args) {
if (arg instanceof seckillrequestdto) {
requestdto = (seckillrequestdto) arg;
break;
}
}
if (requestdto == null || objects.isnull(requestdto.getrequestid())) {
throw new illegalargumentexception("请求id不能为空");
}
// 构建请求key
string requestkey = "seckill:request:" + requestdto.getrequestid();
boolean haskey = redistemplate.haskey(requestkey);
if (boolean.true.equals(haskey)) {
throw new runtimeexception("请勿重复提交请求");
}
// 缓存请求id
redistemplate.opsforvalue().set(requestkey, "1", repeatsubmit.expireseconds(), timeunit.seconds);
try {
return joinpoint.proceed();
} finally {
// 可根据业务需求决定是否移除缓存
// redistemplate.delete(requestkey);
}
}
}
八、核心代码总结与部署建议
1. 代码核心亮点
- 原子性保障:通过 lua 脚本封装库存校验、扣减和用户去重,避免超卖与重复秒杀;
- 流量分层拦截:结合 redis 令牌桶限流、防重复提交 aop,从源头减少无效请求;
- 异步解耦:rabbitmq 异步处理订单创建,提升接口响应速度,降低数据库压力;
- 数据一致性:消息消费失败时回滚 redis 库存,确保缓存与数据库数据同步;
- 可扩展性:支持库存分片、预售模式等复杂场景扩展,适配不同业务需求。
2. 部署与测试建议
- redis 部署:采用主从复制 + 哨兵模式,确保高可用;超大规模秒杀建议使用 redis cluster 分片存储库存;
- 消息队列:开启 rabbitmq 持久化与镜像队列,避免消息丢失;根据流量调整消费者并发数;
- 压力测试:使用 jmeter 模拟 10 万 + 并发请求,重点测试库存准确性、接口响应时间和系统稳定性;
- 监控告警:通过 prometheus+grafana 监控 redis 库存、消息队列堆积量、接口 qps 等核心指标,设置阈值告警。
本文完整呈现了 springboot+redis+lua 秒杀系统的核心代码,覆盖从库存预热到异步下单的全流程,代码可直接复制到项目中使用,只需根据实际业务调整参数与扩展功能。
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