java中采用lua脚本执行redis操作

如果项目不想使用RedissonClient(不同意引入相关依赖)，则可以用lua脚本去实现，因为lua脚本的执行是原子性的 1.lua的执行脚本，set数据 lock-set.lua

--- 获取key
local key = KEYS[1]
--- 获取value
local val = KEYS[2]
--- 获取一个参数
local expire = ARGV[1]
--- 如果redis找不到这个key就去插入
if redis.call("get", key) == false then
    --- 如果插入成功，就去设置过期值
    if redis.call("set", key, val) then
        --- 由于lua脚本接收到参数都会转为String，所以要转成数字类型才能比较
        if tonumber(expire) > 0 then
            --- 设置过期时间
            redis.call("expire", key, expire)
        end
        return true
    end
    return false
else
    return false
end

del数据 lock-del.lua

if redis.call("get",KEYS[1])==ARGV[1] then
  return redis.call("del",KEYS[1])
else
  return 0
end

注：lua脚本执行 都是原子操作 lua脚本的java配置

package com.online.taxi.order.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.scripting.support.ResourceScriptSource;

@Configuration
public class LuaConfiguration {
          
   
    @Bean(name = "set")
    public DefaultRedisScript<Boolean> redisScript() {
          
   
        DefaultRedisScript<Boolean> redisScript = new DefaultRedisScript<>();
        redisScript.setScriptSource(new ResourceScriptSource(new ClassPathResource("luascript/lock-set.lua")));
        redisScript.setResultType(Boolean.class);
        return redisScript;
    }

    @Bean(name = "del")
    public DefaultRedisScript<Boolean> redisScriptDel() {
          
   
        DefaultRedisScript<Boolean> redisScript = new DefaultRedisScript<>();
        redisScript.setScriptSource(new ResourceScriptSource(new ClassPathResource("luascript/lock-del.lua")));
        redisScript.setResultType(Boolean.class);
        return redisScript;
    }
}

这样就免去了service层，直接在controller层调用lua脚本就可以

package com.online.taxi.order.controller;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.Arrays;
import java.util.List;


@RestController
public class LuaLockController {
          
   
    @Resource(name = "set")
    private DefaultRedisScript<Boolean> redisScript;
    @Resource(name = "del")
    private DefaultRedisScript<Boolean> redisScriptDel;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @GetMapping("/lua")
    public ResponseEntity lua() {
          
   
        List<String> keys = Arrays.asList("testLua", "hello lua");
        Boolean execute = stringRedisTemplate.execute(redisScript, keys, "100");
        return null;
    }

    @GetMapping("/lua-del")
    public ResponseEntity luaDel() {
          
   
        List<String> keys = Arrays.asList("testLua");
        Boolean execute = stringRedisTemplate.execute(redisScriptDel, keys,"hello lua");
        return null;
    }
}