{"id":5065,"date":"2021-12-16T20:28:00","date_gmt":"2021-12-17T04:28:00","guid":{"rendered":"https:\/\/www.xh86.me\/?p=5065"},"modified":"2021-12-18T17:53:07","modified_gmt":"2021-12-19T01:53:07","slug":"%e8%b6%85%e8%af%a6%e7%bb%86%e7%9a%84%e7%a7%92%e6%9d%80%e6%9e%b6%e6%9e%84%e8%ae%be%e8%ae%a1%ef%bc%8c%e8%bf%90%e7%bb%b4%ef%bc%8c%e4%ba%86%e8%a7%a3%e4%b8%80%e4%b8%8b","status":"publish","type":"post","link":"https:\/\/www.xh86.me\/?p=5065","title":{"rendered":"\u8d85\u8be6\u7ec6\u7684\u79d2\u6740\u67b6\u6784\u8bbe\u8ba1\uff0c\u8fd0\u7ef4\uff0c\u4e86\u89e3\u4e00\u4e0b"},"content":{"rendered":"
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\u79d2\u6740\u5e94\u8be5\u8003\u8651\u54ea\u4e9b\u95ee\u9898<\/span><\/h3>\n

\u8d85\u5356\u95ee\u9898<\/span><\/h4>\n
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\u9ad8\u5e76\u53d1<\/span><\/h4>\n
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\u63a5\u53e3\u9632\u5237<\/span><\/h4>\n
\u73b0\u5728\u7684\u79d2\u6740\u5927\u591a\u90fd\u4f1a\u51fa\u6765\u9488\u5bf9\u79d2\u6740\u5bf9\u5e94\u7684\u8f6f\u4ef6\uff0c\u8fd9\u7c7b\u8f6f\u4ef6\u4f1a\u6a21\u62df\u4e0d\u65ad\u5411\u540e\u53f0\u670d\u52a1\u5668\u53d1\u8d77\u8bf7\u6c42\uff0c\u4e00\u79d2\u51e0\u767e\u6b21\u90fd\u662f\u5f88\u5e38\u89c1\u7684\uff0c\u5982\u4f55\u9632\u6b62\u8fd9\u7c7b\u8f6f\u4ef6\u7684\u91cd\u590d\u65e0\u6548\u8bf7\u6c42\uff0c\u9632\u6b62\u4e0d\u65ad\u53d1\u8d77\u7684\u8bf7\u6c42\u4e5f\u662f\u9700\u8981\u6211\u4eec\u9488\u5bf9\u6027\u8003\u8651\u7684\u3002<\/span><\/section>\n

\u79d2\u6740 URL<\/span><\/h4>\n
\u5bf9\u4e8e\u666e\u901a\u7528\u6237\u6765\u8bb2\uff0c\u770b\u5230\u7684\u53ea\u662f\u4e00\u4e2a\u6bd4\u8f83\u7b80\u5355\u7684\u79d2\u6740\u9875\u9762\uff0c\u5728\u672a\u8fbe\u5230\u89c4\u5b9a\u65f6\u95f4\uff0c\u79d2\u6740\u6309\u94ae\u662f\u7070\u8272\u7684\uff0c\u4e00\u65e6\u5230\u8fbe\u89c4\u5b9a\u65f6\u95f4\uff0c\u7070\u8272\u6309\u94ae\u53d8\u6210\u53ef\u70b9\u51fb\u72b6\u6001\u3002\u8fd9\u90e8\u5206\u662f\u9488\u5bf9\u5c0f\u767d\u7528\u6237\u7684\uff0c\u5982\u679c\u662f\u7a0d\u5fae\u6709\u70b9\u7535\u8111\u529f\u5e95\u7684\u7528\u6237\uff0c\u4f1a\u901a\u8fc7F12\u770b\u6d4f\u89c8\u5668\u7684network\u770b\u5230\u79d2\u6740\u7684url\uff0c\u901a\u8fc7\u7279\u5b9a\u8f6f\u4ef6\u53bb\u8bf7\u6c42\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u79d2\u6740\u3002\u6216\u8005\u63d0\u524d\u77e5\u9053\u79d2\u6740url\u7684\u4eba\uff0c\u4e00\u8bf7\u6c42\u5c31\u76f4\u63a5\u5b9e\u73b0\u79d2\u6740\u4e86\u3002\u8fd9\u4e2a\u95ee\u9898\u6211\u4eec\u9700\u8981\u8003\u8651\u89e3\u51b3\u3002<\/span><\/section>\n

\u6570\u636e\u5e93\u8bbe\u8ba1<\/span><\/h4>\n
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\u5927\u91cf\u8bf7\u6c42\u95ee\u9898<\/span><\/h4>\n
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\u79d2\u6740\u7cfb\u7edf\u7684\u8bbe\u8ba1\u548c\u6280\u672f\u65b9\u6848<\/span><\/h3>\n

\u79d2\u6740\u7cfb\u7edf\u6570\u636e\u5e93\u8bbe\u8ba1<\/span><\/h4>\n
\u9488\u5bf9\u300c\u6570\u636e\u5e93\u8bbe\u8ba1\u300d\u63d0\u51fa\u7684\u79d2\u6740\u6570\u636e\u5e93\u7684\u95ee\u9898\uff0c\u56e0\u6b64\u5e94\u8be5\u5355\u72ec\u8bbe\u8ba1\u4e00\u4e2a\u79d2\u6740\u6570\u636e\u5e93\uff0c\u9632\u6b62\u56e0\u4e3a\u79d2\u6740\u6d3b\u52a8\u7684\u9ad8\u5e76\u53d1\u8bbf\u95ee\u62d6\u57ae\u6574\u4e2a\u7f51\u7ad9\u3002\u8fd9\u91cc\u53ea\u9700\u8981\u4e24\u5f20\u8868\uff0c\u4e00\u5f20\u662f\u79d2\u6740\u8ba2\u5355\u8868\uff0c\u4e00\u5f20\u662f\u79d2\u6740\u8d27\u54c1\u8868\u3002<\/span><\/section>\n

<\/div><\/p>\n
\u5176\u5b9e\u5e94\u8be5\u8fd8\u6709\u51e0\u5f20\u8868\uff0c\u5546\u54c1\u8868\uff1a\u53ef\u4ee5\u5173\u8054goods_id\u67e5\u5230\u5177\u4f53\u7684\u5546\u54c1\u4fe1\u606f\uff0c\u5546\u54c1\u56fe\u50cf\u3001\u540d\u79f0\u3001\u5e73\u65f6\u4ef7\u683c\u3001\u79d2\u6740\u4ef7\u683c\u7b49\uff0c\u8fd8\u6709\u7528\u6237\u8868\uff1a\u6839\u636e\u7528\u6237user_id\u53ef\u4ee5\u67e5\u8be2\u5230\u7528\u6237\u6635\u79f0\u3001\u7528\u6237\u624b\u673a\u53f7\uff0c\u6536\u8d27\u5730\u5740\u7b49\u5176\u4ed6\u989d\u5916\u4fe1\u606f\uff0c\u8fd9\u4e2a\u5177\u4f53\u5c31\u4e0d\u7ed9\u51fa\u5b9e\u4f8b\u4e86\u3002<\/span><\/section>\n

\u79d2\u6740 URL \u7684\u8bbe\u8ba1<\/span><\/h4>\n

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\u79d2\u6740\u9875\u9762\u9759\u6001\u5316<\/span><\/h4>\n
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\u5355\u4f53 Redis \u5347\u7ea7\u4e3a\u96c6\u7fa4 Redis<\/span><\/h4>\n
\u79d2\u6740\u662f\u4e00\u4e2a\u8bfb\u591a\u5199\u5c11\u7684\u573a\u666f\uff0c\u4f7f\u7528 Redis \u505a\u7f13\u5b58\u518d\u5408\u9002\u4e0d\u8fc7\u3002\u4e0d\u8fc7\u8003\u8651\u5230\u7f13\u5b58\u51fb\u7a7f\u95ee\u9898\uff0c\u6211\u4eec\u5e94\u8be5\u6784\u5efa Redis \u96c6\u7fa4\uff0c\u91c7\u7528\u54e8\u5175\u6a21\u5f0f\uff0c\u53ef\u4ee5\u63d0\u5347Redis\u7684\u6027\u80fd\u548c\u53ef\u7528\u6027\u3002<\/span><\/section>\n

\u4f7f\u7528 Nginx<\/span><\/h4>\n
Nginx \u662f\u4e00\u4e2a\u9ad8\u6027\u80fd Web \u670d\u52a1\u5668\uff0c\u5b83\u7684\u5e76\u53d1\u80fd\u529b\u53ef\u4ee5\u8fbe\u5230\u51e0\u4e07\uff0c\u800c Tomcat \u53ea\u6709\u51e0\u767e\u3002\u901a\u8fc7 Nginx \u6620\u5c04\u5ba2\u6237\u7aef\u8bf7\u6c42\uff0c\u518d\u5206\u53d1\u5230\u540e\u53f0 Tomcat \u670d\u52a1\u5668\u96c6\u7fa4\u4e2d\u53ef\u4ee5\u5927\u5927\u63d0\u5347\u5e76\u53d1\u80fd\u529b\u3002<\/span><\/section>\n

\u7cbe\u7b80 SQL<\/span><\/h4>\n
\u5178\u578b\u7684\u4e00\u4e2a\u573a\u666f\u662f\u5728\u8fdb\u884c\u6263\u51cf\u5e93\u5b58\u7684\u65f6\u5019\uff0c\u4f20\u7edf\u7684\u505a\u6cd5\u662f\u5148\u67e5\u8be2\u5e93\u5b58\uff0c\u518d\u53bbupdate\u3002\u8fd9\u6837\u7684\u8bdd\u9700\u8981\u4e24\u4e2aSQL\uff0c\u800c\u5b9e\u9645\u4e0a\u4e00\u4e2aSQL\u6211\u4eec\u5c31\u53ef\u4ee5\u5b8c\u6210\u7684\u3002\u53ef\u4ee5\u7528\u8fd9\u6837\u7684\u505a\u6cd5\uff1aupdate miaosha_goods set stock =stock-1 where goos_id ={#goods_id} and version = #{version} and sock>0;\u8fd9\u6837\u7684\u8bdd\uff0c\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u5e93\u5b58\u4e0d\u4f1a\u8d85\u5356\u5e76\u4e14\u4e00\u6b21\u66f4\u65b0\u5e93\u5b58\uff0c\u8fd8\u6709\u6ce8\u610f\u4e00\u70b9\u8fd9\u91cc\u4f7f\u7528\u4e86\u7248\u672c\u53f7\u7684\u4e50\u89c2\u9501\uff0c\u76f8\u6bd4\u8f83\u60b2\u89c2\u9501\uff0c\u5b83\u7684\u6027\u80fd\u8f83\u597d\u3002<\/span><\/section>\n

Redis \u9884\u51cf\u5e93\u5b58<\/span><\/h4>\n
\u5f88\u591a\u8bf7\u6c42\u8fdb\u6765\uff0c\u90fd\u9700\u8981\u540e\u53f0\u67e5\u8be2\u5e93\u5b58,\u8fd9\u662f\u4e00\u4e2a\u9891\u7e41\u8bfb\u7684\u573a\u666f\u3002\u53ef\u4ee5\u4f7f\u7528Redis\u6765\u9884\u51cf\u5e93\u5b58\uff0c\u5728\u79d2\u6740\u5f00\u59cb\u524d\u53ef\u4ee5\u5728 Redis \u8bbe\u503c\uff0c\u6bd4\u5982 redis.set(goodsId,100)\uff0c\u8fd9\u91cc\u9884\u653e\u7684\u5e93\u5b58\u4e3a100\u53ef\u4ee5\u8bbe\u503c\u4e3a\u5e38\u91cf\uff0c\u6bcf\u6b21\u4e0b\u5355\u6210\u529f\u4e4b\u540e\uff0cInteger stock = (Integer)redis.get(goosId); \u7136\u540e\u5224\u65ad sock \u7684\u503c\uff0c\u5982\u679c\u5c0f\u4e8e\u5e38\u91cf\u503c\u5c31\u51cf\u53bb1\uff1b\u4e0d\u8fc7\u6ce8\u610f\u5f53\u53d6\u6d88\u7684\u65f6\u5019\uff0c\u9700\u8981\u589e\u52a0\u5e93\u5b58\uff0c\u589e\u52a0\u5e93\u5b58\u7684\u65f6\u5019\u4e5f\u5f97\u6ce8\u610f\u4e0d\u80fd\u5927\u4e8e\u4e4b\u95f4\u8bbe\u5b9a\u7684\u603b\u5e93\u5b58\u6570\uff08\u67e5\u8be2\u5e93\u5b58\u548c\u6263\u51cf\u5e93\u5b58\u9700\u8981\u539f\u5b50\u64cd\u4f5c\uff0c\u6b64\u65f6\u53ef\u4ee5\u501f\u52a9 lua \u811a\u672c\uff09\u4e0b\u6b21\u4e0b\u5355\u518d\u83b7\u53d6\u5e93\u5b58\u7684\u65f6\u5019\uff0c\u76f4\u63a5\u4eceRedis\u91cc\u9762\u67e5\u5c31\u53ef\u4ee5\u4e86\u3002<\/span><\/section>\n

\u63a5\u53e3\u9650\u6d41<\/span><\/h4>\n

\u79d2\u6740\u6700\u7ec8\u7684\u672c\u8d28\u662f\u6570\u636e\u5e93\u7684\u66f4\u65b0\uff0c\u4f46\u662f\u6709\u5f88\u591a\u5927\u91cf\u65e0\u6548\u7684\u8bf7\u6c42\uff0c\u6211\u4eec\u6700\u7ec8\u8981\u505a\u7684\u5c31\u662f\u5982\u4f55\u628a\u8fd9\u4e9b\u65e0\u6548\u7684\u8bf7\u6c42\u8fc7\u6ee4\u6389\uff0c\u9632\u6b62\u6e17\u900f\u5230\u6570\u636e\u5e93\u3002\u9650\u6d41\u7684\u8bdd\uff0c\u9700\u8981\u5165\u624b\u7684\u65b9\u9762\u5f88\u591a\uff1a<\/span><\/p>\n

\u524d\u7aef\u9650\u6d41<\/strong><\/span><\/section>\n
\u9996\u5148\u7b2c\u4e00\u6b65\u5c31\u662f\u901a\u8fc7\u524d\u7aef\u9650\u6d41\uff0c\u7528\u6237\u5728\u79d2\u6740\u6309\u94ae\u70b9\u51fb\u4ee5\u540e\u53d1\u8d77\u8bf7\u6c42\uff0c\u90a3\u4e48\u5728\u63a5\u4e0b\u6765\u76845\u79d2\u662f\u65e0\u6cd5\u70b9\u51fb\uff08\u901a\u8fc7\u8bbe\u7f6e\u6309\u94ae\u4e3adisable\uff09\u3002\u8fd9\u4e00\u5c0f\u4e3e\u63aa\u5f00\u53d1\u8d77\u6765\u6210\u672c\u5f88\u5c0f\uff0c\u4f46\u662f\u5f88\u6709\u6548\u3002<\/span><\/section>\n

\u540c\u4e00\u4e2a\u7528\u6237xx\u79d2\u5185\u91cd\u590d\u8bf7\u6c42\u76f4\u63a5\u62d2\u7edd<\/strong><\/span><\/p>\n

\u5177\u4f53\u591a\u5c11\u79d2\u9700\u8981\u6839\u636e\u5b9e\u9645\u4e1a\u52a1\u548c\u79d2\u6740\u7684\u4eba\u6570\u800c\u5b9a\uff0c\u4e00\u822c\u9650\u5b9a\u4e3a10\u79d2\u3002\u5177\u4f53\u7684\u505a\u6cd5\u5c31\u662f\u901a\u8fc7Redis\u7684\u952e\u8fc7\u671f\u7b56\u7565\uff0c\u9996\u5148\u5bf9\u6bcf\u4e2a\u8bf7\u6c42\u90fd\u4ece String value = redis.get(userId)\uff1b\u5982\u679c\u83b7\u53d6\u5230\u8fd9\u4e2a value \u4e3a\u7a7a\u6216\u8005\u4e3a null\uff0c\u8868\u793a\u5b83\u662f\u6709\u6548\u7684\u8bf7\u6c42\uff0c\u7136\u540e\u653e\u884c\u8fd9\u4e2a\u8bf7\u6c42\u3002\u5982\u679c\u4e0d\u4e3a\u7a7a\u8868\u793a\u5b83\u662f\u91cd\u590d\u6027\u8bf7\u6c42\uff0c\u76f4\u63a5\u4e22\u6389\u8fd9\u4e2a\u8bf7\u6c42\u3002\u5982\u679c\u6709\u6548\uff0c\u91c7\u7528redis.setexpire(userId,value,10).value \u53ef\u4ee5\u662f\u4efb\u610f\u503c\uff0c\u4e00\u822c\u653e\u4e1a\u52a1\u5c5e\u6027\u6bd4\u8f83\u597d\uff0c\u8fd9\u4e2a\u662f\u8bbe\u7f6e\u4ee5 userId \u4e3a key\uff0c10\u79d2\u7684\u8fc7\u671f\u65f6\u95f4\uff0810\u79d2\u540e\uff0ckey\u5bf9\u5e94\u7684\u503c\u81ea\u52a8\u4e3anull\uff09\u3002<\/span><\/section>\n

\u4ee4\u724c\u6876\u7b97\u6cd5\u9650\u6d41<\/strong><\/span><\/p>\n

\u63a5\u53e3\u9650\u6d41\u7684\u7b56\u7565\u6709\u5f88\u591a\uff0c\u6211\u4eec\u8fd9\u91cc\u91c7\u7528\u4ee4\u724c\u6876\u7b97\u6cd5\u3002\u4ee4\u724c\u6876\u7b97\u6cd5\u7684\u57fa\u672c\u601d\u8def\u662f\u6bcf\u4e2a\u8bf7\u6c42\u5c1d\u8bd5\u83b7\u53d6\u4e00\u4e2a\u4ee4\u724c\uff0c\u540e\u7aef\u53ea\u5904\u7406\u6301\u6709\u4ee4\u724c\u7684\u8bf7\u6c42\uff0c\u751f\u4ea7\u4ee4\u724c\u7684\u901f\u5ea6\u548c\u6548\u7387\u6211\u4eec\u90fd\u53ef\u4ee5\u81ea\u5df1\u9650\u5b9a\uff0cGuava \u63d0\u4f9b\u4e86 RateLimter \u7684 API \u4f9b\u6211\u4eec\u4f7f\u7528\u3002\u4ee5\u4e0b\u505a\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u6ce8\u610f\u9700\u8981\u5f15\u5165Guava\uff1a<\/span><\/section>\n
\n
public class TestRateLimiter {<\/span><\/code>\r\n<\/code>    public static void main(String[] args) {<\/span><\/code>        \/\/1\u79d2\u4ea7\u751f1\u4e2a\u4ee4\u724c<\/span><\/code>        final RateLimiter rateLimiter = RateLimiter.create(1);<\/span><\/code>        for (int i = 0; i < 10; i++) {<\/span><\/code>            \/\/\u8be5\u65b9\u6cd5\u4f1a\u963b\u585e\u7ebf\u7a0b\uff0c\u76f4\u5230\u4ee4\u724c\u6876\u4e2d\u80fd\u53d6\u5230\u4ee4\u724c\u4e3a\u6b62\u624d\u7ee7\u7eed\u5411\u4e0b\u6267\u884c\u3002<\/span><\/code>            double waitTime= rateLimiter.acquire();<\/span><\/code>            System.out.println(\"\u4efb\u52a1\u6267\u884c\" + i + \"\u7b49\u5f85\u65f6\u95f4\" + waitTime);<\/span><\/code>        }<\/span><\/code>        System.out.println(\"\u6267\u884c\u7ed3\u675f\");<\/span><\/code>    }<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
\u4e0a\u9762\u4ee3\u7801\u7684\u601d\u8def\u5c31\u662f\u901a\u8fc7RateLimiter\u6765\u9650\u5b9a\u6211\u4eec\u7684\u4ee4\u724c\u6876\u6bcf\u79d2\u4ea7\u751f1\u4e2a\u4ee4\u724c\uff08\u751f\u4ea7\u7684\u6548\u7387\u6bd4\u8f83\u4f4e\uff09\uff0c\u5faa\u73af10\u6b21\u53bb\u6267\u884c\u4efb\u52a1\u3002acquire\u4f1a\u963b\u585e\u5f53\u524d\u7ebf\u7a0b\u76f4\u5230\u83b7\u53d6\u5230\u4ee4\u724c\uff0c\u4e5f\u5c31\u662f\u5982\u679c\u4efb\u52a1\u6ca1\u6709\u83b7\u53d6\u5230\u4ee4\u724c\uff0c\u4f1a\u4e00\u76f4\u7b49\u5f85\u3002\u90a3\u4e48\u8bf7\u6c42\u5c31\u4f1a\u5361\u5728\u6211\u4eec\u9650\u5b9a\u7684\u65f6\u95f4\u5185\u624d\u53ef\u4ee5\u7ee7\u7eed\u5f80\u4e0b\u8d70\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u7684\u662f\u7ebf\u7a0b\u5177\u4f53\u7b49\u5f85\u7684\u65f6\u95f4\u3002\u6267\u884c\u5982\u4e0b\uff1a<\/span><\/section>\n
<\/div><\/p>\n
\u53ef\u4ee5\u770b\u5230\u4efb\u52a1\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u7b2c1\u4e2a\u662f\u65e0\u9700\u7b49\u5f85\u7684\uff0c\u56e0\u4e3a\u5df2\u7ecf\u5728\u5f00\u59cb\u7684\u7b2c1\u79d2\u751f\u4ea7\u51fa\u4e86\u4ee4\u724c\u3002\u63a5\u4e0b\u6765\u7684\u4efb\u52a1\u8bf7\u6c42\u5c31\u5fc5\u987b\u7b49\u5230\u4ee4\u724c\u6876\u4ea7\u751f\u4e86\u4ee4\u724c\u624d\u53ef\u4ee5\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c\u3002\u5982\u679c\u6ca1\u6709\u83b7\u53d6\u5230\u5c31\u4f1a\u963b\u585e\uff08\u6709\u4e00\u4e2a\u505c\u987f\u7684\u8fc7\u7a0b\uff09\u3002\u4e0d\u8fc7\u8fd9\u4e2a\u65b9\u5f0f\u4e0d\u592a\u597d\uff0c\u56e0\u4e3a\u7528\u6237\u5982\u679c\u5728\u5ba2\u6237\u7aef\u8bf7\u6c42\uff0c\u5982\u679c\u8f83\u591a\u7684\u8bdd\uff0c\u76f4\u63a5\u540e\u53f0\u5728\u751f\u4ea7token\u5c31\u4f1a\u5361\u987f\uff08\u7528\u6237\u4f53\u9a8c\u8f83\u5dee\uff09\uff0c\u5b83\u662f\u4e0d\u4f1a\u629b\u5f03\u4efb\u52a1\u7684\uff0c\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u66f4\u4f18\u79c0\u7684\u7b56\u7565\uff1a\u5982\u679c\u8d85\u8fc7\u67d0\u4e2a\u65f6\u95f4\u6ca1\u6709\u83b7\u53d6\u5230\uff0c\u76f4\u63a5\u62d2\u7edd\u8be5\u4efb\u52a1\u3002\u63a5\u4e0b\u6765\u518d\u6765\u4e2a\u6848\u4f8b\uff1a<\/span><\/section>\n
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    public class TestRateLimiter2 {<\/span><\/code>\r\n<\/code>    public static void main(String[] args) {<\/span><\/code>        final RateLimiter rateLimiter = RateLimiter.create(1);<\/span><\/code>\r\n<\/code>        for (int i = 0; i < 10; i++) {<\/span><\/code>            long timeOut = (long) 0.5;<\/span><\/code>            boolean isValid = rateLimiter.tryAcquire(timeOut, TimeUnit.SECONDS);<\/span><\/code>            System.out.println(\"\u4efb\u52a1\" + i + \"\u6267\u884c\u662f\u5426\u6709\u6548:\" + isValid);<\/span><\/code>            if (!isValid) {<\/span><\/code>                continue;<\/span><\/code>            }<\/span><\/code>            System.out.println(\"\u4efb\u52a1\" + i + \"\u5728\u6267\u884c\");<\/span><\/code>        }<\/span><\/code>        System.out.println(\"\u7ed3\u675f\");<\/span><\/code>    }<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
    \u5176\u4e2d\u7528\u5230\u4e86tryAcquire\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u8bbe\u5b9a\u4e00\u4e2a\u8d85\u65f6\u7684\u65f6\u95f4\uff0c\u5982\u679c\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u5185\u9884\u4f30\uff08\u6ce8\u610f\u662f\u9884\u4f30\u5e76\u4e0d\u4f1a\u771f\u5b9e\u7684\u7b49\u5f85\uff09\uff0c\u5982\u679c\u80fd\u62ff\u5230\u4ee4\u724c\u5c31\u8fd4\u56detrue\uff0c\u5982\u679c\u62ff\u4e0d\u5230\u5c31\u8fd4\u56defalse\u3002\u7136\u540e\u6211\u4eec\u8ba9\u65e0\u6548\u7684\u76f4\u63a5\u8df3\u8fc7\uff0c\u8fd9\u91cc\u8bbe\u5b9a\u6bcf\u79d2\u751f\u4ea71\u4e2a\u4ee4\u724c\uff0c\u8ba9\u6bcf\u4e2a\u4efb\u52a1\u5c1d\u8bd5\u57280.5\u79d2\u83b7\u53d6\u4ee4\u724c\uff0c\u5982\u679c\u83b7\u53d6\u4e0d\u5230\uff0c\u5c31\u76f4\u63a5\u8df3\u8fc7\u8fd9\u4e2a\u4efb\u52a1\uff08\u653e\u5728\u79d2\u6740\u73af\u5883\u91cc\u5c31\u662f\u76f4\u63a5\u629b\u5f03\u8fd9\u4e2a\u8bf7\u6c42\uff09\u3002\u7a0b\u5e8f\u5b9e\u9645\u8fd0\u884c\u5982\u4e0b\uff1a<\/span><\/section>\n
    <\/div><\/p>\n
    \u53ea\u6709\u7b2c1\u4e2a\u83b7\u53d6\u5230\u4e86\u4ee4\u724c\uff0c\u987a\u5229\u6267\u884c\u4e86\uff0c\u4e0b\u9762\u7684\u57fa\u672c\u90fd\u76f4\u63a5\u629b\u5f03\u4e86\uff0c\u56e0\u4e3a0.5\u79d2\u5185\uff0c\u4ee4\u724c\u6876\uff081\u79d21\u4e2a\uff09\u6765\u4e0d\u53ca\u751f\u4ea7\u5c31\u80af\u5b9a\u83b7\u53d6\u4e0d\u5230\u8fd4\u56defalse\u4e86\u3002<\/span><\/section>\n
    \u8fd9\u4e2a\u9650\u6d41\u7b56\u7565\u7684\u6548\u7387\u6709\u591a\u9ad8\u5462\uff1f\u5047\u5982\u6211\u4eec\u7684\u5e76\u53d1\u8bf7\u6c42\u662f400\u4e07\u77ac\u95f4\u7684\u8bf7\u6c42\uff0c\u5c06\u4ee4\u724c\u4ea7\u751f\u7684\u6548\u7387\u8bbe\u4e3a\u6bcf\u79d220\u4e2a\uff0c\u6bcf\u6b21\u5c1d\u8bd5\u83b7\u53d6\u4ee4\u724c\u7684\u65f6\u95f4\u662f0.05\u79d2\uff0c\u90a3\u4e48\u6700\u7ec8\u6d4b\u8bd5\u4e0b\u6765\u7684\u7ed3\u679c\u662f\uff0c\u6bcf\u6b21\u53ea\u4f1a\u653e\u884c4\u4e2a\u5de6\u53f3\u7684\u8bf7\u6c42\uff0c\u5927\u91cf\u7684\u8bf7\u6c42\u4f1a\u88ab\u62d2\u7edd\uff0c\u8fd9\u5c31\u662f\u4ee4\u724c\u6876\u7b97\u6cd5\u7684\u4f18\u79c0\u4e4b\u5904\u3002<\/span><\/section>\n
    \u5f02\u6b65\u4e0b\u5355<\/span><\/h3>\n
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