{"id":3207,"date":"2024-05-23T17:20:51","date_gmt":"2024-05-23T09:20:51","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3207"},"modified":"2024-12-08T12:36:53","modified_gmt":"2024-12-08T04:36:53","slug":"%e5%9f%ba%e4%ba%8e%e6%95%b0%e6%8d%ae%e5%ba%93%e5%ae%9e%e7%8e%b0java%e5%88%86%e5%b8%83%e5%bc%8f%e9%94%81%e7%9a%84%e6%8a%80%e6%9c%af","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3207","title":{"rendered":"\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0Java\u5206\u5e03\u5f0f\u9501\u7684\u6280\u672f"},"content":{"rendered":"\n<p>\u5728Java\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5e76\u53d1\u63a7\u5236\u624b\u6bb5\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5206\u5e03\u5f0f\u9501\u7684\u4f5c\u7528\u3001\u4f7f\u7528\u573a\u666f\uff0c\u4ee5\u53ca\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u7684\u65b9\u6848\uff0c\u7279\u522b\u5173\u6ce8\u4f7f\u7528 <code>SELECT ... FOR UPDATE<\/code> \u8bed\u53e5\u6765\u7ba1\u7406\u5206\u5e03\u5f0f\u9501\uff0c\u63a2\u8ba8\u5176\u662f\u5426\u80fd\u591f\u907f\u514d\u5e76\u53d1\u95ee\u9898\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"450\" src=\"https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/05\/image-21-1024x450.png\" alt=\"\" class=\"wp-image-3208\" style=\"width:600px\" srcset=\"https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/05\/image-21-1024x450.png 1024w, https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/05\/image-21-300x132.png 300w, https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/05\/image-21-768x337.png 768w, https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/05\/image-21.png 1352w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e00\u3001\u5206\u5e03\u5f0f\u9501\u7684\u4f5c\u7528\u4e0e\u4f7f\u7528\u573a\u666f<\/h5>\n\n\n\n<p>\u5206\u5e03\u5f0f\u9501\u4e3b\u8981\u7528\u4e8e\u89e3\u51b3\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u8d44\u6e90\u7684\u5e76\u53d1\u8bbf\u95ee\u95ee\u9898\uff0c\u786e\u4fdd\u5728\u591a\u4e2a\u8282\u70b9\u540c\u65f6\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u65f6\uff0c\u53ea\u6709\u4e00\u4e2a\u8282\u70b9\u80fd\u591f\u83b7\u5f97\u9501\uff0c\u4ece\u800c\u907f\u514d\u8d44\u6e90\u7684\u51b2\u7a81\u548c\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\u3002\u5e38\u89c1\u7684\u4f7f\u7528\u573a\u666f\u5305\u62ec\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5206\u5e03\u5f0f\u73af\u5883\u4e0b\u7684\u552f\u4e00\u6027\u64cd\u4f5c<\/strong>\uff1a\u6bd4\u5982\u4fdd\u8bc1\u5168\u5c40ID\u7684\u552f\u4e00\u6027\u3001\u9650\u6d41\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u5206\u5e03\u5f0f\u4efb\u52a1\u8c03\u5ea6<\/strong>\uff1a\u786e\u4fdd\u5728\u591a\u4e2a\u8282\u70b9\u4e0a\u7684\u5b9a\u65f6\u4efb\u52a1\u53ea\u6709\u4e00\u4e2a\u8282\u70b9\u6267\u884c\uff0c\u907f\u514d\u91cd\u590d\u6267\u884c\u3002<\/li>\n\n\n\n<li><strong>\u5206\u5e03\u5f0f\u4e8b\u52a1\u63a7\u5236<\/strong>\uff1a\u5728\u5206\u5e03\u5f0f\u4e8b\u52a1\u4e2d\uff0c\u9700\u8981\u5bf9\u591a\u4e2a\u8d44\u6e90\u8fdb\u884c\u52a0\u9501\uff0c\u4fdd\u8bc1\u4e8b\u52a1\u7684\u4e00\u81f4\u6027\u548c\u9694\u79bb\u6027\u3002<\/li>\n<\/ol>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e8c\u3001\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u65b9\u6848<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. \u9501\u8868\u8bbe\u8ba1<\/h6>\n\n\n\n<p>\u5728\u6570\u636e\u5e93\u4e2d\u521b\u5efa\u4e00\u5f20\u7528\u4e8e\u5b58\u50a8\u9501\u4fe1\u606f\u7684\u8868\uff0c\u8be5\u8868\u81f3\u5c11\u5305\u542b\u4ee5\u4e0b\u5b57\u6bb5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9501\u540d\u79f0\uff1a\u7528\u4e8e\u6807\u8bc6\u4e0d\u540c\u7684\u9501\u3002<\/li>\n\n\n\n<li>\u9501\u72b6\u6001\uff1a\u6807\u8bc6\u9501\u7684\u72b6\u6001\uff0c\u5982\u662f\u5426\u88ab\u5360\u7528\u3002<\/li>\n\n\n\n<li>\u9501\u6301\u6709\u8005\uff1a\u6807\u8bc6\u5f53\u524d\u6301\u6709\u9501\u7684\u8282\u70b9\u6216\u7ebf\u7a0b\u3002<\/li>\n\n\n\n<li>\u9501\u8fc7\u671f\u65f6\u95f4\uff1a\u9632\u6b62\u6b7b\u9501\u60c5\u51b5\u7684\u53d1\u751f\uff0c\u8bbe\u5b9a\u9501\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u8d85\u8fc7\u8be5\u65f6\u95f4\u81ea\u52a8\u91ca\u653e\u9501\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u793a\u4f8bDDL\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-b001879506b0d874929b8692c7a651fc\"><code>CREATE TABLE distributed_lock (\n    lock_name VARCHAR(64) PRIMARY KEY,\n    lock_holder VARCHAR(255),\n    lock_status VARCHAR(10),\n    expire_time TIMESTAMP\n);<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">2. \u52a0\u9501\u4e0e\u91ca\u653e\u9501<\/h6>\n\n\n\n<p>\u5728\u9700\u8981\u52a0\u9501\u7684\u5730\u65b9\uff0c\u4f7f\u7528 <code>SELECT ... FOR UPDATE<\/code> \u8bed\u53e5\u6765\u83b7\u53d6\u9501\uff1a<\/p>\n\n\n\n<p>\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u5b9a\u4e49\u4e00\u4e2aMyBatis\u7684Mapper\u63a5\u53e3\uff0c\u7528\u4e8e\u64cd\u4f5c\u5206\u5e03\u5f0f\u9501\u7684\u6570\u636e\u5e93\u8868\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-9ea8a7e2fc818ebd0203cdbcc61c4d74\"><code>import org.apache.ibatis.annotations.Mapper;\n\n@Mapper\npublic interface DistributedLockMapper {\n    \/\/ \u67e5\u8be2\u9501\u4fe1\u606f\u5e76\u52a0\u9501\n    void selectForUpdate(String lockName);\n\n    \/\/ \u91ca\u653e\u9501\n    void releaseLock();\n}<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\uff0c\u7f16\u5199\u5bf9\u5e94\u7684Mapper XML\u6587\u4ef6 <code>DistributedLockMapper.xml<\/code>\uff0c\u5b9e\u73b0SQL\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-0d4182974d6019e342048d456316f370\"><code>&lt;?xml version=\"1.0\" encoding=\"UTF-8\" ?&gt;\n&lt;!DOCTYPE mapper PUBLIC \"-\/\/mybatis.org\/\/DTD Mapper 3.0\/\/EN\"\n        \"http:\/\/mybatis.org\/dtd\/mybatis-3-mapper.dtd\"&gt;\n&lt;mapper namespace=\"com.example.mapper.DistributedLockMapper\"&gt;\n    &lt;!-- \u67e5\u8be2\u9501\u4fe1\u606f\u5e76\u52a0\u9501 --&gt;\n    &lt;select id=\"selectForUpdate\" parameterType=\"String\" statementType=\"PREPARED\"&gt;\n        SELECT * FROM distributed_lock WHERE lock_name = #{lockName} FOR UPDATE\n    &lt;\/select&gt;\n\n    &lt;!-- \u91ca\u653e\u9501 --&gt;\n    &lt;update id=\"releaseLock\"&gt;\n        COMMIT\n    &lt;\/update&gt;\n&lt;\/mapper&gt;<\/code><\/pre>\n\n\n\n<p>\u63a5\u4e0b\u6765\uff0c\u7f16\u5199Service\u5c42\u4ee3\u7801\uff0c\u8c03\u7528Mapper\u63a5\u53e3\u6765\u5b9e\u73b0\u52a0\u9501\u548c\u91ca\u653e\u9501\u7684\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-a896e17623c58385c78b3cfbd1d23227\"><code>import org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\nimport org.springframework.transaction.annotation.Transactional;\n\n@Service\npublic class DistributedLockService {\n    @Autowired\n    private DistributedLockMapper distributedLockMapper;\n\n    @Transactional\n    public void acquireLock(String lockName) {\n        distributedLockMapper.selectForUpdate(lockName);\n    }\n\n    @Transactional\n    public void releaseLock() {\n        distributedLockMapper.releaseLock();\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u6700\u540e\uff0c\u5728\u4e1a\u52a1\u903b\u8f91\u4e2d\u8c03\u7528Service\u5c42\u65b9\u6cd5\u6765\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u7684\u52a0\u9501\u548c\u91ca\u653e\u9501\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-edccff02af037c4a48c6abecda743129\"><code>import org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\n\n@Service\npublic class YourBusinessLogicService {\n    @Autowired\n    private DistributedLockService distributedLockService;\n\n    public void yourBusinessLogic() {\n        try {\n            \/\/ \u52a0\u9501\n            distributedLockService.acquireLock(\"lock_name\");\n\n            \/\/ \u6a21\u62df\u4e1a\u52a1\u903b\u8f91\n            System.out.println(\"\u4e1a\u52a1\u903b\u8f91\u6267\u884c\u4e2d...\");\n\n            \/\/ \u91ca\u653e\u9501\n            distributedLockService.releaseLock();\n        } catch (Exception e) {\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u901a\u8fc7\u4ee5\u4e0a\u6b65\u9aa4\uff0c\u6211\u4eec\u5229\u7528MyBatis\u6846\u67b6\u5b9e\u73b0\u4e86\u57fa\u4e8e\u6570\u636e\u5e93\u7684\u5206\u5e03\u5f0f\u9501\u529f\u80fd\u3002\u5728\u4e1a\u52a1\u903b\u8f91\u4e2d\uff0c\u8c03\u7528 <code>acquireLock<\/code> \u65b9\u6cd5\u83b7\u53d6\u9501\uff0c\u7136\u540e\u6267\u884c\u4e1a\u52a1\u903b\u8f91\uff0c\u6700\u540e\u8c03\u7528 <code>releaseLock<\/code> \u65b9\u6cd5\u91ca\u653e\u9501\u3002\u6574\u4e2a\u8fc7\u7a0b\u5728\u4e8b\u52a1\u7684\u7ba1\u7406\u4e0b\u8fdb\u884c\uff0c\u786e\u4fdd\u4e86\u5206\u5e03\u5f0f\u9501\u7684\u6b63\u786e\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5e76\u53d1\u63a7\u5236\u624b\u6bb5\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5206\u5e03\u5f0f\u9501\u7684\u4f5c\u7528\u3001\u4f7f\u7528\u573a\u666f\uff0c\u4ee5 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[118],"tags":[186,16],"class_list":["post-3207","post","type-post","status-publish","format-standard","hentry","category-118","tag-186","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0Java\u5206\u5e03\u5f0f\u9501\u7684\u6280\u672f<\/title>\n<meta name=\"description\" content=\"\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5e76\u53d1\u63a7\u5236\u624b\u6bb5\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5206\u5e03\u5f0f\u9501\u7684\u4f5c\u7528\u3001\u4f7f\u7528\u573a\u666f\uff0c\u4ee5\u53ca\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u7684\u65b9\u6848\uff0c\u7279\u522b\u5173\u6ce8\u4f7f\u7528 SELECT ... FOR UPDATE \u8bed\u53e5\u6765\u7ba1\u7406\u5206\u5e03\u5f0f\u9501\uff0c\u63a2\u8ba8\u5176\u662f\u5426\u80fd\u591f\u907f\u514d\u5e76\u53d1\u95ee\u9898\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.talktop.cn\/?p=3207\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.talktop.cn\/?p=3207#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.talktop.cn\/?p=3207\"},\"author\":{\"name\":\"AI\u98ce\u5411\u6807\",\"@id\":\"https:\/\/www.talktop.cn\/#\/schema\/person\/25908db5f654913a22bc38d48fad71ab\"},\"headline\":\"\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0Java\u5206\u5e03\u5f0f\u9501\u7684\u6280\u672f\",\"datePublished\":\"2024-05-23T09:20:51+00:00\",\"dateModified\":\"2024-12-08T04:36:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.talktop.cn\/?p=3207\"},\"wordCount\":13,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.talktop.cn\/#\/schema\/person\/25908db5f654913a22bc38d48fad71ab\"},\"image\":{\"@id\":\"https:\/\/www.talktop.cn\/?p=3207#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/05\/image-21-1024x450.png\",\"keywords\":[\"\u5206\u5e03\u5f0f\u9501\",\"\u7f16\u7a0b\"],\"articleSection\":[\"\u540e\u7aef\u5f00\u53d1\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.talktop.cn\/?p=3207#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.talktop.cn\/?p=3207\",\"url\":\"https:\/\/www.talktop.cn\/?p=3207\",\"name\":\"\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0Java\u5206\u5e03\u5f0f\u9501\u7684\u6280\u672f\",\"isPartOf\":{\"@id\":\"https:\/\/www.talktop.cn\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.talktop.cn\/?p=3207#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.talktop.cn\/?p=3207#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/05\/image-21-1024x450.png\",\"datePublished\":\"2024-05-23T09:20:51+00:00\",\"dateModified\":\"2024-12-08T04:36:53+00:00\",\"description\":\"\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5e76\u53d1\u63a7\u5236\u624b\u6bb5\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5206\u5e03\u5f0f\u9501\u7684\u4f5c\u7528\u3001\u4f7f\u7528\u573a\u666f\uff0c\u4ee5\u53ca\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u7684\u65b9\u6848\uff0c\u7279\u522b\u5173\u6ce8\u4f7f\u7528 SELECT ... 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