# 添加 RedisUtils 类。

src/main/java/cn/quantgroup/xyqb/Utils/RedisUtils.java

+package cn.quantgroup.xyqb.Utils;
+
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.core.script.DefaultRedisScript;
+import org.springframework.data.redis.core.script.RedisScript;
+
+import java.util.Arrays;
+
+/**
+ * Created by zhiguo.liu on 2017/7/28.
+ */
+public class RedisUtils {
+    /**
+     * 通过 setnx + expire 命令，原子性给某个 key 上锁并设置过期时间
+     * 上锁成功返回 true ，上锁失败返回 false.
+     *
+     * @param redisTemplate
+     * @param key
+     * @param expire
+     * @return
+     */
+
+    public static boolean lock(RedisTemplate redisTemplate, String key, Integer expire) {
+        String lua = "local result = redis.call(\"setnx\",KEYS[1],\"1\")if result == 1 then redis.call(\"expire\",KEYS[1],ARGV[1]) end return result";
+        RedisScript<Long> script = new DefaultRedisScript<>(lua, Long.class);
+
+        Object result = redisTemplate.execute(script, Arrays.asList(key), expire.toString());
+        if (result != null && result instanceof Long) {
+            return (Long) result == 1;
+        }
+        return false;
+    }
+
+}