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實施步驟

1. 在服務器上運行Intellij IDEA，創(chuàng)建一個MAVEN工程，為示例代碼創(chuàng)建一個SecondsKill.java文件，pom.xml文件中引用Jedis：

    

   <dependency>
         <groupId>redis.clients</groupId>
           <artifactId>jedis</artifactId>
         <version>4.2.0</version>
   </dependency>
   
   

2. 編譯并運行以下demo，該示例以Java語言實現(xiàn)。

    

   示例中的Redis連接地址和端口需要根據(jù)實際獲取的值進行修改。

   package com.huawei.demo;
   import java.util.ArrayList;
   import java.util.*;
   
   import redis.clients.jedis.Jedis;
   import redis.clients.jedis.JedisPool;
   import redis.clients.jedis.JedisPoolConfig;
   
   public class SecondsKill {
   	private static void InitProduct(Jedis jedis) {
   		jedis.hset("product", "total", "200");
   		jedis.hset("product", "booked", "0");
   		jedis.hset("product","remain", "200");
   	}
   
   	private static String LoadLuaScript(Jedis jedis) {
   		String lua = "local n = tonumber(ARGV[1])\n"
   			+ "if not n  or n == 0 then\n"
   			+ "return 0\n"
   			+ "end\n"
   			+ "local vals = redis.call(\"HMGET\", KEYS[1], \"total\", \"booked\", \"remain\");\n"
   			+ "local booked = tonumber(vals[2])\n"
   			+ "local remain = tonumber(vals[3])\n"
   			+ "if booked <= remain then\n"
   			+ "redis.call(\"HINCRBY\", KEYS[1], \"booked\", n)\n"
   			+ "redis.call(\"HINCRBY\", KEYS[1], \"remain\", -n)\n"
   			+ "return n;\n"
   			+ "end\n"
   			+ "return 0";
   		String scriptLoad = jedis.scriptLoad(lua);
   
   		return scriptLoad;
   	}
   
   	public static void main(String[] args) {
   		JedisPoolConfig config = new JedisPoolConfig();
   		// 最大連接數(shù)
   		config.setMaxTotal(30);
   		// 最大連接空閑數(shù)
   		config.setMaxIdle(2);
   		// 連接Redis，Redis實例連接地址和端口需替換為實際獲取的值
   		JedisPool pool = new JedisPool(config, "127.0.0.1", 6379);
   		Jedis jedis = null;
   		try {
   			jedis = pool.getResource();
                           jedis.auth("password");   //配置實例的連接密碼，免密訪問的實例無需填寫
   			System.out.println(jedis);
   
   			// 初始化產(chǎn)品信息
   			InitProduct(jedis);
   
   			// 存入lua腳本
   			String scriptLoad = LoadLuaScript(jedis);
   
   			List<String> keys = new ArrayList<>();
   			List<String> vals = new ArrayList<>();
   			keys.add("product");
   
   			//下單15個
   			int num = 15;
   			vals.add(String.valueOf(num));
   
   			//執(zhí)行l(wèi)ua腳本
   			jedis.evalsha(scriptLoad, keys, vals);
   			System.out.println("total:"+jedis.hget("product", "total")+"\n"+"booked:"+jedis.hget("product",
   				"booked")+"\n"+"remain:"+jedis.hget("product","remain"));
   
   		} catch (Exception ex) {
   			ex.printStackTrace();
   		} finally {
   			if (jedis != null) {
   				jedis.close();
   			}
   		}
   	}
   }

    

   執(zhí)行結果：

   total:200
   booked:15
   remain:185