客户端增加扣减库存

src/main/java/com/chaozhanggui/system/cashierservice/util/RedisCst.java

@@ -13,4 +13,5 @@ public class RedisCst {
     public static final String ONLINE_USER = "ONLINE:USER";
     public static final String CART = "CZG:CART:";
 
+    public static final Object PRODUCT = "PRODUCT:";
 }

src/main/java/com/chaozhanggui/system/cashierservice/util/RedisUtil.java

@@ -577,4 +577,43 @@ public class RedisUtil {
         }
         return 0L ;
     }
+
+    String secKillScript =  "local prodid=KEYS[1];\r\n" +
+            "local usernum=KEYS[2];\r\n" +
+            "local num= redis.call(\"get\" ,prodid);\r\n" +
+            "if tonumber(num)<tonumber(usernum) then \r\n" +
+            "   return 0;\r\n" +
+            "end\r\n" +
+            "if tonumber(num)<=0 then \r\n" +
+            "   return 0;\r\n" +
+            "else \r\n" +
+            "   redis.call(\"DECRBY\",prodid,tonumber(usernum));\r\n" +
+            "end\r\n" +
+            "return 1";
+    public String seckill(String key,String num) {
+        Jedis jedis = null;
+        try {
+            if (StringUtils.isEmpty(key)) {
+                return REDIS_FAILED+"";
+            }
+            // 从jedis池中获取一个jedis实例
+            jedis = pool.getResource();
+            if (database!=0) {
+                jedis.select(database);
+            }
+            Object result = jedis.eval(secKillScript, Arrays.asList( key,num), new ArrayList<>());
+            String reString = String.valueOf(result);
+            return reString;
+
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            // 释放对象池，即获取jedis实例使用后要将对象还回去
+            // 释放对象池，即获取jedis实例使用后要将对象还回去
+            if (jedis != null) {
+                jedis.close();
+            }
+        }
+        return REDIS_FAILED+"";
+    }
 }