{"id":201842,"date":"2025-05-10T13:27:58","date_gmt":"2025-05-10T05:27:58","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201842\/"},"modified":"2025-05-10T13:27:58","modified_gmt":"2025-05-10T05:27:58","slug":"springboot%e6%95%b4%e5%90%88redis%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e8%b6%85%e5%8d%96%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201842\/","title":{"rendered":"Springboot\u6574\u5408Redis\u5982\u4f55\u5b9e\u73b0\u8d85\u5356\u95ee\u9898"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>Springboot\u6574\u5408Redis\u5982\u4f55\u5b9e\u73b0\u8d85\u5356\u95ee\u9898<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300aSpringboot\u6574\u5408Redis\u5982\u4f55\u5b9e\u73b0\u8d85\u5356\u95ee\u9898\u300b\uff0c\u8986\u76d6\u4e86\u6570\u636e\u5e93\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n<ul>\n<ul><\/ul>\n<\/ul>\n<h3>\u8d85\u5356\u7b80\u5355\u4ee3\u7801<\/h3>\n<p>\u5199\u4e00\u6bb5\u7b80\u5355\u6b63\u5e38\u7684\u8d85\u5356\u903b\u8f91\u4ee3\u7801\uff0c\u591a\u4e2a\u7528\u6237\u540c\u65f6\u64cd\u4f5c\u540c\u4e00\u6bb5\u6570\u636e\uff0c\u63a2\u7a76\u51fa\u73b0\u7684\u95ee\u9898\u3002<\/p>\n<p>Redis\u4e2d\u5b58\u50a8\u4e00\u9879\u6570\u636e\u4fe1\u606f\uff0c\u8bf7\u6c42\u5bf9\u5e94\u63a5\u53e3\uff0c\u83b7\u53d6\u5546\u54c1\u6570\u91cf\u4fe1\u606f\uff1b<br \/>\u5546\u54c1\u6570\u91cf\u4fe1\u606f\u5982\u679c\u5927\u4e8e0\uff0c\u5219\u6263\u51cf1\uff0c\u91cd\u65b0\u5b58\u50a8Redis\u4e2d\uff1b<br \/>\u8fd0\u884c\u4ee3\u7801\u6d4b\u8bd5\u95ee\u9898\u3002<\/p>\n<pre>\/**\n&nbsp;*&nbsp;Redis\u6570\u636e\u5e93\u64cd\u4f5c\uff0c\u8d85\u5356\u95ee\u9898\u6a21\u62df\n&nbsp;*&nbsp;@author&nbsp;\n&nbsp;*\n&nbsp;*\/\n@RestController\npublic&nbsp;class&nbsp;RedisController&nbsp;{\n\t\n\t\/\/&nbsp;\u5f15\u5165String\u7c7b\u578bredis\u64cd\u4f5c\u6a21\u677f\n\t@Autowired\n\tprivate&nbsp;StringRedisTemplate&nbsp;stringRedisTemplate;\n&nbsp;\n&nbsp;\n\t\/\/&nbsp;\u6d4b\u8bd5\u6570\u636e\u8bbe\u7f6e\u63a5\u53e3\n\t@RequestMapping(\"\/setStock\")\n\tpublic&nbsp;String&nbsp;setStock()&nbsp;{\n\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;\"100\");\n\t\treturn&nbsp;\"ok\";\n\t}\n\t\n\t\/\/&nbsp;\u6a21\u62df\u5546\u54c1\u8d85\u5356\u4ee3\u7801\n\t@RequestMapping(\"\/deductStock\")\n\tpublic&nbsp;String&nbsp;deductStock()&nbsp;{\n\t\t\/\/&nbsp;\u83b7\u53d6Redis\u6570\u636e\u5e93\u4e2d\u7684\u5546\u54c1\u6570\u91cf\n\t\tInteger&nbsp;stock&nbsp;=&nbsp;Integer.parseInt(stringRedisTemplate.opsForValue().get(\"stock\"));\n\t\t\/\/&nbsp;\u51cf\u5e93\u5b58\n\t\tif(stock&nbsp;&gt;&nbsp;0)&nbsp;{\n\t\t\tint&nbsp;realStock&nbsp;=&nbsp;stock&nbsp;-1;\n\t\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;String.valueOf(realStock));\n\t\t\tSystem.out.println(\"\u5546\u54c1\u6263\u51cf\u6210\u529f\uff0c\u5269\u4f59\u5546\u54c1\uff1a\"+realStock);\n\t\t}else&nbsp;{\n\t\t\tSystem.out.println(\"\u5e93\u5b58\u4e0d\u8db3.....\");\n\t\t}\n\t\treturn&nbsp;\"end\";\n\t}\n}<\/pre>\n<h3>\u8d85\u5356\u95ee\u9898<\/h3>\n<h4>\u5355\u670d\u52a1\u5668\u5355\u5e94\u7528\u60c5\u51b5\u4e0b<\/h4>\n<p>\u5728\u5355\u5e94\u7528\u6a21\u5f0f\u4e0b\uff0c\u4f7f\u7528<code>jmeter<\/code>\u538b\u6d4b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab3816e8d.png\" class=\"aligncenter\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab3821e96.png\" class=\"aligncenter\"><\/p>\n<p>&nbsp;\u6d4b\u8bd5\u7ed3\u679c\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab382dce0.png\" class=\"aligncenter\"><\/p>\n<p>\u6bcf\u4e2a\u8bf7\u6c42\u76f8\u5f53\u4e8e\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5f53\u51e0\u4e2a\u7ebf\u7a0b\u540c\u65f6\u62ff\u5230\u6570\u636e\u65f6\uff0c\u7ebf\u7a0bA\u62ff\u5230\u5e93\u5b58\u4e3a84\uff0c\u8fd9\u4e2a\u65f6\u5019\u7ebf\u7a0bB\u4e5f\u8fdb\u5165\u7a0b\u5e8f\uff0c\u5e76\u4e14\u62a2\u5360\u4e86CPU\uff0c\u8bbf\u95ee\u5e93\u5b58\u4e3a84\uff0c\u6700\u540e\u4e24\u4e2a\u7ebf\u7a0b\u90fd\u5bf9\u5e93\u5b58\u51cf\u4e00\uff0c\u5bfc\u81f4\u6700\u540e\u4fee\u6539\u4e3a83\uff0c\u5b9e\u9645\u4e0a\u591a\u5356\u51fa\u53bb\u4e86\u4e00\u4ef6<\/p>\n<p>\u65e2\u7136\u7ebf\u7a0b\u548c\u7ebf\u7a0b\u4e4b\u95f4\uff0c\u6570\u636e\u5904\u7406\u4e0d\u4e00\u81f4\uff0c\u80fd\u5426\u4f7f\u7528<code>synchronized<\/code>\u52a0\u9501\u6d4b\u8bd5\uff1f<\/p>\n<h4>\u8bbe\u7f6esynchronized<\/h4>\n<p>\u4f9d\u65e7\u8fd8\u662f\u5148\u6d4b\u8bd5\u5355\u670d\u52a1\u5668<\/p>\n<pre>\/\/&nbsp;\u6a21\u62df\u5546\u54c1\u8d85\u5356\u4ee3\u7801,\n\t\/\/&nbsp;\u8bbe\u7f6esynchronized\u540c\u6b65\u9501\n\t@RequestMapping(\"\/deductStock1\")\n\tpublic&nbsp;String&nbsp;deductStock1()&nbsp;{\n\t\tsynchronized&nbsp;(this)&nbsp;{\n\t\t\t\/\/&nbsp;\u83b7\u53d6Redis\u6570\u636e\u5e93\u4e2d\u7684\u5546\u54c1\u6570\u91cf\n\t\t\tInteger&nbsp;stock&nbsp;=&nbsp;Integer.parseInt(stringRedisTemplate.opsForValue().get(\"stock\"));\n\t\t\t\/\/&nbsp;\u51cf\u5e93\u5b58\n\t\t\tif(stock&nbsp;&gt;&nbsp;0)&nbsp;{\n\t\t\t\tint&nbsp;realStock&nbsp;=&nbsp;stock&nbsp;-1;\n\t\t\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;String.valueOf(realStock));\n\t\t\t\tSystem.out.println(\"\u5546\u54c1\u6263\u51cf\u6210\u529f\uff0c\u5269\u4f59\u5546\u54c1\uff1a\"+realStock);\n\t\t\t}else&nbsp;{\n\t\t\t\tSystem.out.println(\"\u5e93\u5b58\u4e0d\u8db3.....\");\n\t\t\t}\n\t\t}\n\t\treturn&nbsp;\"end\";\n\t}<\/pre>\n<p>\u6570\u91cf<code>100<\/code><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab383948e.png\" class=\"aligncenter\"><\/p>\n<p>\u91cd\u65b0\u538b\u6d4b\uff0c\u5f97\u5230\u7684\u65e5\u5fd7\u4fe1\u606f\u5982\u4e0b\u6240\u793a\uff1a&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab3844544.png\" class=\"aligncenter\"><\/p>\n<p>&nbsp;\u5728\u5355\u673a\u6a21\u5f0f\u4e0b\uff0c\u6dfb\u52a0synchronized\u5173\u952e\u5b57\uff0c\u7684\u786e\u80fd\u591f\u907f\u514d\u5546\u54c1\u7684\u8d85\u5356\u73b0\u8c61\uff01<\/p>\n<p>\u4f46\u662f\u5728\u5206\u5e03\u5f0f\u5fae\u670d\u52a1\u4e2d\uff0c\u9488\u5bf9\u8be5\u670d\u52a1\u8bbe\u7f6e\u4e86\u96c6\u7fa4\uff0csynchronized\u4f9d\u65e7\u8fd8\u80fd\u4fdd\u8bc1\u6570\u636e\u7684\u6b63\u786e\u6027\u5417\uff1f<\/p>\n<p>\u5047\u8bbe\u591a\u4e2a\u8bf7\u6c42\uff0c\u88ab\u6ce8\u518c\u4e2d\u5fc3\u8d1f\u8f7d\u5747\u8861\uff0c\u6bcf\u4e2a\u5fae\u670d\u52a1\u4e2d\u7684\u8be5\u5904\u7406\u63a5\u53e3\uff0c\u90fd\u6dfb\u52a0\u6709synchronized\uff0c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab384f604.png\" class=\"aligncenter\"><\/p>\n<p>&nbsp;\u4f9d\u7136\u4f1a\u51fa\u73b0\u7c7b\u4f3c\u7684<code>\u8d85\u5356<\/code>\u95ee\u9898\uff1a<\/p>\n<blockquote>\n<p><code>synchronized<\/code>\u53ea\u662f\u9488\u5bf9<code>\u5355\u4e00\u670d\u52a1\u5668<\/code>\u7684<code>JVM<\/code>\u8fdb\u884c<code>\u52a0\u9501<\/code>\uff0c\u4f46\u662f\u5206\u5e03\u5f0f\u662f\u5f88\u591a\u4e2a\u4e0d\u540c\u7684\u670d\u52a1\u5668\uff0c\u5bfc\u81f4\u4e24\u4e2a\u7ebf\u7a0b\u6216\u591a\u4e2a\u5728\u4e0d\u540c\u670d\u52a1\u5668\u4e0a\u5171\u540c\u5bf9\u5546\u54c1\u6570\u91cf\u4fe1\u606f\u505a\u4e86\u64cd\u4f5c\uff01<\/p>\n<\/blockquote>\n<hr>\n<h3>Redis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501&nbsp;<\/h3>\n<p>\u5728Redis\u4e2d\u5b58\u5728\u4e00\u6761\u547d\u4ee4<code>setnx (set if not exists)<\/code><\/p>\n<blockquote>\n<p>setnx key value<br \/>\u5982\u679c\u4e0d\u5b58\u5728key\uff0c\u5219\u53ef\u4ee5\u8bbe\u7f6e\u6210\u529f\uff1b\u5426\u5219\u8bbe\u7f6e\u5931\u8d25\u3002<\/p>\n<\/blockquote>\n<p>\u4fee\u6539\u5904\u7406\u63a5\u53e3\uff0c\u589e\u52a0key<\/p>\n<pre>\/\/&nbsp;\u6a21\u62df\u5546\u54c1\u8d85\u5356\u4ee3\u7801\n\t@RequestMapping(\"\/deductStock2\")\n\tpublic&nbsp;String&nbsp;deductStock2()&nbsp;{\n\t\t\/\/&nbsp;\u521b\u5efa\u4e00\u4e2akey\uff0c\u4fdd\u5b58\u81f3redis\n\t\tString&nbsp;key&nbsp;=&nbsp;\"lock\";\n\t\t\/\/&nbsp;setnx\n\t\t\/\/&nbsp;\u7531\u4e8eredis\u662f\u4e00\u4e2a\u5355\u7ebf\u7a0b\uff0c\u6267\u884c\u547d\u4ee4\u91c7\u53d6\u201c\u961f\u5217\u201d\u5f62\u5f0f\u6392\u961f\uff01\n\t\t\/\/&nbsp;\u4f18\u5148\u8fdb\u5165\u961f\u5217\u7684\u547d\u4ee4\u5148\u6267\u884c\uff0c\u7531\u4e8e\u662fsetnx\uff0c\u7b2c\u4e00\u4e2a\u6267\u884c\u540e\uff0c\u5176\u4ed6\u64cd\u4f5c\u6267\u884c\u5931\u8d25\u3002\n\t\tboolean&nbsp;result&nbsp;=&nbsp;stringRedisTemplate.opsForValue().setIfAbsent(key,&nbsp;\"this&nbsp;is&nbsp;lock\");\n\t\t\/\/&nbsp;\u5f53\u4e0d\u5b58\u5728key\u65f6\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u6210\u529f\uff0c\u56de\u6267true\uff1b\u5982\u679c\u5b58\u5728key\uff0c\u5219\u65e0\u6cd5\u8bbe\u7f6e\uff0c\u8fd4\u56defalse\n\t\tif&nbsp;(!result)&nbsp;{\n\t\t\t\/\/&nbsp;\u524d\u7aef\u76d1\u6d4b\uff0credis\u4e2d\u5b58\u5728\uff0c\u5219\u4e0d\u80fd\u8ba9\u8fd9\u4e2a\u62a2\u8d2d\u64cd\u4f5c\u6267\u884c\uff0c\u4e88\u4ee5\u63d0\u793a\uff01\n\t\t\treturn&nbsp;\"err\";\n\t\t}\n\t\t\n\t\t\/\/&nbsp;\u83b7\u53d6Redis\u6570\u636e\u5e93\u4e2d\u7684\u5546\u54c1\u6570\u91cf\n\t\tInteger&nbsp;stock&nbsp;=&nbsp;Integer.parseInt(stringRedisTemplate.opsForValue().get(\"stock\"));\n\t\t\/\/&nbsp;\u51cf\u5e93\u5b58\n\t\tif(stock&nbsp;&gt;&nbsp;0)&nbsp;{\n\t\t\tint&nbsp;realStock&nbsp;=&nbsp;stock&nbsp;-1;\n\t\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;String.valueOf(realStock));\n\t\t\tSystem.out.println(\"\u5546\u54c1\u6263\u51cf\u6210\u529f\uff0c\u5269\u4f59\u5546\u54c1\uff1a\"+realStock);\n\t\t}else&nbsp;{\n\t\t\tSystem.out.println(\"\u5e93\u5b58\u4e0d\u8db3.....\");\n\t\t}\n&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/&nbsp;\u7a0b\u5e8f\u6267\u884c\u5b8c\u6210\uff0c\u5219\u5220\u9664\u8fd9\u4e2akey\n\t\tstringRedisTemplate.delete(key);\n&nbsp;\n\t\treturn&nbsp;\"end\";\n\t}<\/pre>\n<blockquote>\n<p>1\u3001\u8bf7\u6c42\u8fdb\u5165\u63a5\u53e3\u4e2d\uff0c\u5982\u679credis\u4e2d\u4e0d\u5b58\u5728key\uff0c\u5219\u4f1a\u65b0\u5efa\u4e00\u4e2asetnx\uff1b\u5982\u679c\u5b58\u5728\uff0c\u5219\u4e0d\u4f1a\u65b0\u5efa\uff0c\u540c\u65f6\u8fd4\u56de\u9519\u8bef\u7f16\u7801\uff0c\u4e0d\u4f1a\u7ee7\u7eed\u6267\u884c\u62a2\u8d2d\u903b\u8f91\u3002<br \/>2\u3001\u5f53\u521b\u5efa\u6210\u529f\u540e\uff0c\u6267\u884c\u62a2\u8d2d\u903b\u8f91\u3002<br \/>3\u3001\u62a2\u8d2d\u903b\u8f91\u6267\u884c\u5b8c\u6210\u540e\uff0c\u5220\u9664\u6570\u636e\u5e93\u4e2d\u5bf9\u5e94\u7684<code>setnx<\/code>\u7684<code>key<\/code>\u3002\u8ba9\u5176\u4ed6\u8bf7\u6c42\u80fd\u591f\u8bbe\u7f6e\u5e76\u64cd\u4f5c\u3002<\/p>\n<\/blockquote>\n<p>\u8fd9\u79cd\u903b\u8f91\u6765\u8bf4\u6bd4\u4e4b\u524d\u5355\u4e00\u4f7f\u7528<code>syn<\/code>\u5408\u7406\u7684\u591a\uff0c\u4f46\u662f\u5982\u679c\u6267\u884c\u62a2\u8d2d\u64cd\u4f5c\u4e2d\u51fa\u73b0\u4e86\u5f02\u5e38\uff0c\u5bfc\u81f4\u8fd9\u4e2a<code>key<\/code>\u65e0\u6cd5\u88ab<code>\u5220\u9664<\/code>\u3002\u4ee5\u81f3\u4e8e\u5176\u4ed6\u5904\u7406\u8bf7\u6c42\uff0c\u4e00\u76f4\u65e0\u6cd5\u62ff\u5230<code>key<\/code>\uff0c\u7a0b\u5e8f\u903b\u8f91\u6b7b\u9501\uff01<\/p>\n<p>\u53ef\u4ee5\u91c7\u53d6try \u2026 finally\u8fdb\u884c\u64cd\u4f5c&nbsp;<\/p>\n<pre>\/**\n\t&nbsp;*&nbsp;\u6a21\u62df\u5546\u54c1\u8d85\u5356\u4ee3\u7801&nbsp;\u8bbe\u7f6e\n\t&nbsp;*\n\t&nbsp;*&nbsp;@return\n\t&nbsp;*\/\n\t@RequestMapping(\"\/deductStock3\")\n\tpublic&nbsp;String&nbsp;deductStock3()&nbsp;{\n\t\t\/\/&nbsp;\u521b\u5efa\u4e00\u4e2akey\uff0c\u4fdd\u5b58\u81f3redis\n\t\tString&nbsp;key&nbsp;=&nbsp;\"lock\";\n\t\t\/\/&nbsp;setnx\n\t\t\/\/&nbsp;\u7531\u4e8eredis\u662f\u4e00\u4e2a\u5355\u7ebf\u7a0b\uff0c\u6267\u884c\u547d\u4ee4\u91c7\u53d6\u961f\u5217\u5f62\u5f0f\u6392\u961f\uff01\u4f18\u5148\u8fdb\u5165\u961f\u5217\u7684\u547d\u4ee4\u5148\u6267\u884c\uff0c\u7531\u4e8e\u662fsetnx\uff0c\u7b2c\u4e00\u4e2a\u6267\u884c\u540e\uff0c\u5176\u4ed6\u64cd\u4f5c\u6267\u884c\u5931\u8d25\n\t\tboolean&nbsp;result&nbsp;=&nbsp;stringRedisTemplate.opsForValue().setIfAbsent(key,&nbsp;\"this&nbsp;is&nbsp;lock\");\n\t\t\/\/&nbsp;\u5f53\u4e0d\u5b58\u5728key\u65f6\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u6210\u529f\uff0c\u56de\u6267true\uff1b\u5982\u679c\u5b58\u5728key\uff0c\u5219\u65e0\u6cd5\u8bbe\u7f6e\uff0c\u8fd4\u56defalse\n\t\tif&nbsp;(!result)&nbsp;{\n\t\t\t\/\/&nbsp;\u524d\u7aef\u76d1\u6d4b\uff0credis\u4e2d\u5b58\u5728\uff0c\u5219\u4e0d\u80fd\u8ba9\u8fd9\u4e2a\u62a2\u8d2d\u64cd\u4f5c\u6267\u884c\uff0c\u4e88\u4ee5\u63d0\u793a\uff01\n\t\t\treturn&nbsp;\"err\";\n\t\t}\n&nbsp;\n\t\ttry&nbsp;{\n\t\t\t\/\/&nbsp;\u83b7\u53d6Redis\u6570\u636e\u5e93\u4e2d\u7684\u5546\u54c1\u6570\u91cf\n\t\t\tInteger&nbsp;stock&nbsp;=&nbsp;Integer.parseInt(stringRedisTemplate.opsForValue().get(\"stock\"));\n\t\t\t\/\/&nbsp;\u51cf\u5e93\u5b58\n\t\t\tif&nbsp;(stock&nbsp;&gt;&nbsp;0)&nbsp;{\n\t\t\t\tint&nbsp;realStock&nbsp;=&nbsp;stock&nbsp;-&nbsp;1;\n\t\t\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;String.valueOf(realStock));\n\t\t\t\tSystem.out.println(\"\u5546\u54c1\u6263\u51cf\u6210\u529f\uff0c\u5269\u4f59\u5546\u54c1\uff1a\"&nbsp;+&nbsp;realStock);\n\t\t\t}&nbsp;else&nbsp;{\n\t\t\t\tSystem.out.println(\"\u5e93\u5b58\u4e0d\u8db3.....\");\n\t\t\t}\n\t\t}&nbsp;finally&nbsp;{\n\t\t\t\/\/&nbsp;\u7a0b\u5e8f\u6267\u884c\u5b8c\u6210\uff0c\u5219\u5220\u9664\u8fd9\u4e2akey\n\t\t\t\/\/&nbsp;\u653e\u7f6e\u4e8efinally\u4e2d\uff0c\u4fdd\u8bc1\u5373\u4f7f\u4e0a\u8ff0\u903b\u8f91\u51fa\u95ee\u9898\uff0c\u4e5f\u80fddel\u6389\n\t\t\tstringRedisTemplate.delete(key);\n\t\t}\n&nbsp;\n\t\treturn&nbsp;\"end\";\n\t}<\/pre>\n<p>\u8fd9\u4e2a\u903b\u8f91\u76f8\u6bd4\u4e0a\u9762\u5176\u4ed6\u7684\u903b\u8f91\u6765\u8bf4\uff0c\u663e\u5f97\u66f4\u52a0\u7684\u4e25\u8c28\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u5982\u679c\u4e00\u5957\u670d\u52a1\u5668\uff0c\u56e0\u4e3a\u65ad\u7535\u3001\u7cfb\u7edf\u5d29\u6e83\u7b49\u539f\u56e0\u51fa\u73b0<code>\u5b95\u673a<\/code>\uff0c\u5bfc\u81f4\u672c\u8be5\u6267\u884c<code>finally<\/code>\u4e2d\u7684\u8bed\u53e5\u672a\u6210\u529f\u6267\u884c\u5b8c\u6210\uff01\uff01\u540c\u6837\u51fa\u73b0<code>key\u4e00\u76f4\u5b58\u5728<\/code>\uff0c\u5bfc\u81f4<code>\u6b7b\u9501<\/code>\uff01<\/p>\n<h4>\u901a\u8fc7\u8d85\u65f6\u95f4\u89e3\u51b3\u4e0a\u8ff0\u95ee\u9898<\/h4>\n<p>\u5728\u8bbe\u7f6e\u6210\u529f<code>setnx<\/code>\u540e\uff0c\u4ee5\u53ca\u62a2\u8d2d\u4ee3\u7801\u903b\u8f91\u6267\u884c\u524d\uff0c\u589e\u52a0key\u7684\u9650\u65f6\u3002<\/p>\n<pre>\/**\n\t&nbsp;*&nbsp;\u6a21\u62df\u5546\u54c1\u8d85\u5356\u4ee3\u7801&nbsp;\u8bbe\u7f6esetnx\u4fdd\u8bc1\u5206\u5e03\u5f0f\u73af\u5883\u4e0b\uff0c\u6570\u636e\u5904\u7406\u5b89\u5168\u884c\u95ee\u9898\uff1b&lt;br&gt;\n\t&nbsp;*&nbsp;\u4f46\u5982\u679c\u67d0\u4e2a\u4ee3\u7801\u6bb5\u6267\u884c\u5f02\u5e38\uff0c\u5bfc\u81f4key\u65e0\u6cd5\u6e05\u7406\uff0c\u51fa\u73b0\u6b7b\u9501\uff0c\u6dfb\u52a0try...finally;&lt;br&gt;\n\t&nbsp;*&nbsp;\u5982\u679c\u67d0\u4e2a\u670d\u52a1\u56e0\u67d0\u4e9b\u95ee\u9898\u5bfc\u81f4\u91ca\u653ekey\u4e0d\u80fd\u6267\u884c\uff0c\u5bfc\u81f4\u6b7b\u9501\uff0c\u6b64\u65f6\u89e3\u51b3\u601d\u8def\u4e3a\uff1a\u589e\u52a0key\u7684\u6709\u6548\u65f6\u95f4;&lt;br&gt;\n\t&nbsp;*&nbsp;\u4e3a\u4e86\u4fdd\u8bc1\u8bbe\u7f6ekey\u7684\u503c\u548c\u8bbe\u7f6ekey\u7684\u6709\u6548\u65f6\u95f4\uff0c\u4e24\u6761\u547d\u4ee4\u6784\u6210\u540c\u4e00\u6761\u539f\u5b50\u547d\u4ee4\uff0c\u5c06\u4e0b\u5217\u903b\u8f91\u6362\u6210\u5176\u4ed6\u4ee3\u7801\u3002\n\t&nbsp;*\n\t&nbsp;*&nbsp;@return\n\t&nbsp;*\/\n\t@RequestMapping(\"\/deductStock4\")\n\tpublic&nbsp;String&nbsp;deductStock4()&nbsp;{\n\t\t\/\/&nbsp;\u521b\u5efa\u4e00\u4e2akey\uff0c\u4fdd\u5b58\u81f3redis\n\t\tString&nbsp;key&nbsp;=&nbsp;\"lock\";\n\t\t\/\/&nbsp;setnx\n\t\t\/\/&nbsp;\u7531\u4e8eredis\u662f\u4e00\u4e2a\u5355\u7ebf\u7a0b\uff0c\u6267\u884c\u547d\u4ee4\u91c7\u53d6\u961f\u5217\u5f62\u5f0f\u6392\u961f\uff01\u4f18\u5148\u8fdb\u5165\u961f\u5217\u7684\u547d\u4ee4\u5148\u6267\u884c\uff0c\u7531\u4e8e\u662fsetnx\uff0c\u7b2c\u4e00\u4e2a\u6267\u884c\u540e\uff0c\u5176\u4ed6\u64cd\u4f5c\u6267\u884c\u5931\u8d25\n\t\t\/\/boolean&nbsp;result&nbsp;=&nbsp;stringRedisTemplate.opsForValue().setIfAbsent(key,&nbsp;\"this&nbsp;is&nbsp;lock\");\n&nbsp;\n\t\t\/\/\u8ba9\u8bbe\u7f6ekey\u548c\u8bbe\u7f6ekey\u7684\u6709\u6548\u65f6\u95f4\u90fd\u53ef\u4ee5\u540c\u65f6\u6267\u884c\n\t\tboolean&nbsp;result&nbsp;=&nbsp;stringRedisTemplate.opsForValue().setIfAbsent(key,&nbsp;\"this&nbsp;is&nbsp;lock\",&nbsp;10,&nbsp;TimeUnit.SECONDS);\n&nbsp;\n\t\t\/\/&nbsp;\u5f53\u4e0d\u5b58\u5728key\u65f6\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u6210\u529f\uff0c\u56de\u6267true\uff1b\u5982\u679c\u5b58\u5728key\uff0c\u5219\u65e0\u6cd5\u8bbe\u7f6e\uff0c\u8fd4\u56defalse\n\t\tif&nbsp;(!result)&nbsp;{\n\t\t\t\/\/&nbsp;\u524d\u7aef\u76d1\u6d4b\uff0credis\u4e2d\u5b58\u5728\uff0c\u5219\u4e0d\u80fd\u8ba9\u8fd9\u4e2a\u62a2\u8d2d\u64cd\u4f5c\u6267\u884c\uff0c\u4e88\u4ee5\u63d0\u793a\uff01\n\t\t\treturn&nbsp;\"err\";\n\t\t}\n\t\t\/\/&nbsp;\u8bbe\u7f6ekey\u6709\u6548\u65f6\u95f4\n\t\t\/\/stringRedisTemplate.expire(key,&nbsp;10,&nbsp;TimeUnit.SECONDS);\n&nbsp;\n\t\ttry&nbsp;{\n\t\t\t\/\/&nbsp;\u83b7\u53d6Redis\u6570\u636e\u5e93\u4e2d\u7684\u5546\u54c1\u6570\u91cf\n\t\t\tInteger&nbsp;stock&nbsp;=&nbsp;Integer.parseInt(stringRedisTemplate.opsForValue().get(\"stock\"));\n\t\t\t\/\/&nbsp;\u51cf\u5e93\u5b58\n\t\t\tif&nbsp;(stock&nbsp;&gt;&nbsp;0)&nbsp;{\n\t\t\t\tint&nbsp;realStock&nbsp;=&nbsp;stock&nbsp;-&nbsp;1;\n\t\t\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;String.valueOf(realStock));\n\t\t\t\tSystem.out.println(\"\u5546\u54c1\u6263\u51cf\u6210\u529f\uff0c\u5269\u4f59\u5546\u54c1\uff1a\"&nbsp;+&nbsp;realStock);\n\t\t\t}&nbsp;else&nbsp;{\n\t\t\t\tSystem.out.println(\"\u5e93\u5b58\u4e0d\u8db3.....\");\n\t\t\t}\n\t\t}&nbsp;finally&nbsp;{\n\t\t\t\/\/&nbsp;\u7a0b\u5e8f\u6267\u884c\u5b8c\u6210\uff0c\u5219\u5220\u9664\u8fd9\u4e2akey\n\t\t\t\/\/&nbsp;\u653e\u7f6e\u4e8efinally\u4e2d\uff0c\u4fdd\u8bc1\u5373\u4f7f\u4e0a\u8ff0\u903b\u8f91\u51fa\u95ee\u9898\uff0c\u4e5f\u80fddel\u6389\n\t\t\tstringRedisTemplate.delete(key);\n\t\t}\n&nbsp;\n\t\treturn&nbsp;\"end\";\n\t}<\/pre>\n<p>\u4f46\u662f\u4e0a\u8ff0\u4ee3\u7801\u7684\u903b\u8f91\u4e2d\u4f9d\u65e7\u4f1a\u6709\u95ee\u9898\uff1a<\/p>\n<blockquote>\n<p>\u5982\u679c\u5904\u7406\u903b\u8f91\u4e2d\uff0c\u51fa\u73b0<code>\u8d85\u65f6<\/code>\u95ee\u9898\u3002<br \/>\u5f53\u903b\u8f91\u6267\u884c\u65f6\uff0c\u65f6\u95f4\u8d85\u8fc7\u8bbe\u5b9akey\u6709\u6548\u65f6\u95f4\uff0c\u6b64\u65f6\u4f1a\u51fa\u73b0\u4ec0\u4e48\u95ee\u9898\uff1f<\/p>\n<\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab3859a89.jpg\" class=\"aligncenter\"><\/p>\n<blockquote>\n<p>&nbsp;\u4ece\u4e0a\u56fe\u53ef\u4ee5\u6e05\u695a\u7684\u53d1\u73b0\u95ee\u9898\uff1a<br \/>\u5982\u679c\u4e00\u4e2a\u8bf7\u6c42\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u4e86key\u7684\u6709\u6548\u65f6\u95f4\u3002<br \/>\u65b0\u7684\u8bf7\u6c42\u6267\u884c\u8fc7\u6765\u65f6\uff0c\u5fc5\u7136\u53ef\u4ee5\u62ff\u5230key\u5e76\u8bbe\u7f6e\u65f6\u95f4\uff1b<br \/>\u6b64\u65f6\u7684redis\u4e2d\u4fdd\u5b58\u7684key\u5e76\u4e0d\u662f\u8bf7\u6c421\u7684key\uff0c\u800c\u662f\u522b\u7684\u8bf7\u6c42\u8bbe\u7f6e\u7684\u3002<br \/>\u5f53\u8bf7\u6c421\u6267\u884c\u5b8c\u6210\u540e\uff0c\u6b64\u5904\u5220\u9664key\uff0c\u5220\u9664\u7684\u662f\u522b\u7684\u8bf7\u6c42\u8bbe\u7f6e\u7684key\uff01<\/p>\n<\/blockquote>\n<p>\u4f9d\u7136\u51fa\u73b0\u4e86<code>key\u5f62\u540c\u865a\u8bbe<\/code>\u7684\u95ee\u9898\uff01\u5982\u679c\u5931\u6548\u4e00\u76f4\u5b58\u5728\uff0c\u8d85\u5356\u95ee\u9898\u4f9d\u65e7\u4e0d\u4f1a\u89e3\u51b3\u3002<\/p>\n<h4>\u901a\u8fc7key\u8bbe\u7f6e\u503c\u5339\u914d\u7684\u65b9\u5f0f\u89e3\u51b3\u5f62\u540c\u865a\u8bbe\u95ee\u9898&nbsp;<\/h4>\n<p>\u65e2\u7136\u51fa\u73b0key\u5f62\u540c\u865a\u8bbe\u7684\u73b0\u8c61\uff0c\u662f\u5426\u53ef\u4ee5\u589e\u52a0\u6761\u4ef6\uff0c\u5f53finally\u4e2d\u9700\u8981\u6267\u884c\u5220\u9664\u64cd\u4f5c\u65f6\uff0c\u83b7\u53d6\u6570\u636e\u5224\u65ad\u503c\u662f\u5426\u662f\u8be5\u8bf7\u6c42\u4e2d\u5bf9\u5e94\u7684\uff0c\u5982\u679c\u662f\u5219\u5220\u9664\uff0c\u4e0d\u662f\u5219\u4e0d\u7ba1\uff01<\/p>\n<p>\u4fee\u6539\u4e0a\u8ff0\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>\/**\n\t&nbsp;*&nbsp;\u6a21\u62df\u5546\u54c1\u8d85\u5356\u4ee3\u7801&nbsp;&lt;br&gt;\n\t&nbsp;*&nbsp;\u89e3\u51b3`deductStock6`\u4e2d\uff0ckey\u5f62\u540c\u865a\u8bbe\u7684\u95ee\u9898\u3002\n\t&nbsp;*\n\t&nbsp;*&nbsp;@return\n\t&nbsp;*\/\n\t@RequestMapping(\"\/deductStock5\")\n\tpublic&nbsp;String&nbsp;deductStock5()&nbsp;{\n\t\t\/\/&nbsp;\u521b\u5efa\u4e00\u4e2akey\uff0c\u4fdd\u5b58\u81f3redis\n\t\tString&nbsp;key&nbsp;=&nbsp;\"lock\";\n\t\tString&nbsp;lock_value&nbsp;=&nbsp;UUID.randomUUID().toString();\n\t\t\/\/&nbsp;setnx\n\t\t\/\/\u8ba9\u8bbe\u7f6ekey\u548c\u8bbe\u7f6ekey\u7684\u6709\u6548\u65f6\u95f4\u90fd\u53ef\u4ee5\u540c\u65f6\u6267\u884c\n\t\tboolean&nbsp;result&nbsp;=&nbsp;stringRedisTemplate.opsForValue().setIfAbsent(key,&nbsp;lock_value,&nbsp;10,&nbsp;TimeUnit.SECONDS);\n\t\t\/\/&nbsp;\u5f53\u4e0d\u5b58\u5728key\u65f6\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u6210\u529f\uff0c\u56de\u6267true\uff1b\u5982\u679c\u5b58\u5728key\uff0c\u5219\u65e0\u6cd5\u8bbe\u7f6e\uff0c\u8fd4\u56defalse\n\t\tif&nbsp;(!result)&nbsp;{\n\t\t\t\/\/&nbsp;\u524d\u7aef\u76d1\u6d4b\uff0credis\u4e2d\u5b58\u5728\uff0c\u5219\u4e0d\u80fd\u8ba9\u8fd9\u4e2a\u62a2\u8d2d\u64cd\u4f5c\u6267\u884c\uff0c\u4e88\u4ee5\u63d0\u793a\uff01\n\t\t\treturn&nbsp;\"err\";\n\t\t}\n\t\ttry&nbsp;{\n\t\t\t\/\/&nbsp;\u83b7\u53d6Redis\u6570\u636e\u5e93\u4e2d\u7684\u5546\u54c1\u6570\u91cf\n\t\t\tInteger&nbsp;stock&nbsp;=&nbsp;Integer.parseInt(stringRedisTemplate.opsForValue().get(\"stock\"));\n\t\t\t\/\/&nbsp;\u51cf\u5e93\u5b58\n\t\t\tif&nbsp;(stock&nbsp;&gt;&nbsp;0)&nbsp;{\n\t\t\t\tint&nbsp;realStock&nbsp;=&nbsp;stock&nbsp;-&nbsp;1;\n\t\t\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;String.valueOf(realStock));\n\t\t\t\tSystem.out.println(\"\u5546\u54c1\u6263\u51cf\u6210\u529f\uff0c\u5269\u4f59\u5546\u54c1\uff1a\"&nbsp;+&nbsp;realStock);\n\t\t\t}&nbsp;else&nbsp;{\n\t\t\t\tSystem.out.println(\"\u5e93\u5b58\u4e0d\u8db3.....\");\n\t\t\t}\n\t\t}&nbsp;finally&nbsp;{\n\t\t\t\/\/&nbsp;\u7a0b\u5e8f\u6267\u884c\u5b8c\u6210\uff0c\u5219\u5220\u9664\u8fd9\u4e2akey\n\t\t\t\/\/&nbsp;\u653e\u7f6e\u4e8efinally\u4e2d\uff0c\u4fdd\u8bc1\u5373\u4f7f\u4e0a\u8ff0\u903b\u8f91\u51fa\u95ee\u9898\uff0c\u4e5f\u80fddel\u6389\n&nbsp;\n\t\t\t\/\/&nbsp;\u5224\u65adredis\u4e2d\u8be5\u6570\u636e\u662f\u5426\u662f\u8fd9\u4e2a\u63a5\u53e3\u5904\u7406\u65f6\u7684\u8bbe\u7f6e\u7684\uff0c\u5982\u679c\u662f\u5219\u5220\u9664\n\t\t\tif(lock_value.equalsIgnoreCase(stringRedisTemplate.opsForValue().get(key)))&nbsp;{\n\t\t\t\tstringRedisTemplate.delete(key);\n\t\t\t}\n\t\t}\n\t\treturn&nbsp;\"end\";\n\t}<\/pre>\n<p>\u7531\u4e8e\u83b7\u5f97\u9501\u7684\u7ebf\u7a0b\u5fc5\u987b\u6267\u884c\u5b8c\u51cf\u5e93\u5b58\u903b\u8f91\u624d\u80fd\u91ca\u653e\u9501\uff0c\u6240\u4ee5\u5728\u6b64\u671f\u95f4\u6240\u6709\u5176\u4ed6\u7684\u7ebf\u7a0b\u90fd\u4f1a\u7531\u4e8e\u6ca1\u83b7\u5f97\u9501\uff0c\u800c\u76f4\u63a5\u7ed3\u675f\u7a0b\u5e8f\uff0c\u5bfc\u81f4\u6709\u5f88\u591a\u5e93\u5b58\u6839\u672c\u6ca1\u6709\u5356\u51fa\u53bb\uff0c\u6240\u4ee5\u8fd9\u91cc\u5e94\u8be5\u53ef\u4ee5\u4f18\u5316\uff0c\u8ba9\u6ca1\u83b7\u5f97\u9501\u7684\u7ebf\u7a0b\u7b49\u5f85\uff0c\u6216\u8005\u5faa\u73af\u68c0\u67e5\u9501&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab3865509.png\" class=\"aligncenter\"><\/p>\n<hr>\n<h3>\u6700\u7ec8\u7248<\/h3>\n<p>\u6211\u4eec\u5c06\u9501\u5c01\u88c5\u5230\u4e00\u4e2a\u5b9e\u4f53\u7c7b\u4e2d\uff0c\u7136\u540e\u52a0\u5165\u4e24\u4e2a\u65b9\u6cd5\uff0c\u52a0\u9501\u548c\u89e3\u9501<\/p>\n<pre>@Component\npublic&nbsp;class&nbsp;RedisLock&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;private&nbsp;final&nbsp;Logger&nbsp;log&nbsp;=&nbsp;LoggerFactory.getLogger(this.getClass());\n&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;private&nbsp;final&nbsp;long&nbsp;acquireTimeout&nbsp;=&nbsp;10*1000;&nbsp;&nbsp;&nbsp;&nbsp;\/\/&nbsp;\u83b7\u53d6\u9501\u4e4b\u524d\u7684\u8d85\u65f6\u65f6\u95f4(\u83b7\u53d6\u9501\u7684\u7b49\u5f85\u91cd\u8bd5\u65f6\u95f4)\n&nbsp;&nbsp;&nbsp;&nbsp;private&nbsp;final&nbsp;int&nbsp;timeOut&nbsp;=&nbsp;20;&nbsp;&nbsp;&nbsp;\/\/&nbsp;\u83b7\u53d6\u9501\u4e4b\u540e\u7684\u8d85\u65f6\u65f6\u95f4(\u9632\u6b62\u6b7b\u9501)\n&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;@Autowired\n&nbsp;&nbsp;&nbsp;&nbsp;private&nbsp;StringRedisTemplate&nbsp;stringRedisTemplate;&nbsp;&nbsp;\/\/&nbsp;\u5f15\u5165String\u7c7b\u578bredis\u64cd\u4f5c\u6a21\u677f\n&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;\/**\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;\u83b7\u53d6\u5206\u5e03\u5f0f\u9501\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;@return&nbsp;\u9501\u6807\u8bc6\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*\/\n&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;boolean&nbsp;getRedisLock(String&nbsp;lockName,String&nbsp;lockValue)&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/&nbsp;1.\u8ba1\u7b97\u83b7\u53d6\u9501\u7684\u65f6\u95f4\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Long&nbsp;endTime&nbsp;=&nbsp;System.currentTimeMillis()&nbsp;+&nbsp;acquireTimeout;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/&nbsp;2.\u5c1d\u8bd5\u83b7\u53d6\u9501\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;while&nbsp;(System.currentTimeMillis()&nbsp;&lt;&nbsp;endTime)&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/3.&nbsp;\u83b7\u53d6\u9501\u6210\u529f\u5c31\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4&nbsp;\u8ba9\u8bbe\u7f6ekey\u548c\u8bbe\u7f6ekey\u7684\u6709\u6548\u65f6\u95f4\u90fd\u53ef\u4ee5\u540c\u65f6\u6267\u884c\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;boolean&nbsp;result&nbsp;=&nbsp;stringRedisTemplate.opsForValue().setIfAbsent(lockName,&nbsp;lockValue,&nbsp;timeOut,&nbsp;TimeUnit.SECONDS);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(result)&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;true;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;false;\n&nbsp;&nbsp;&nbsp;&nbsp;}\n&nbsp;\n&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;\/**\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;\u91ca\u653e\u5206\u5e03\u5f0f\u9501\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;@param&nbsp;lockName&nbsp;\u9501\u540d\u79f0\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;@param&nbsp;lockValue&nbsp;\u9501\u503c\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*\/\n&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;void&nbsp;unRedisLock(String&nbsp;lockName,String&nbsp;lockValue)&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(lockValue.equalsIgnoreCase(stringRedisTemplate.opsForValue().get(lockName)))&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stringRedisTemplate.delete(lockName);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n&nbsp;&nbsp;&nbsp;&nbsp;}\n}<\/pre>\n<pre>@RestController\npublic&nbsp;class&nbsp;RedisController&nbsp;{\n\t\n\t\/\/&nbsp;\u5f15\u5165String\u7c7b\u578bredis\u64cd\u4f5c\u6a21\u677f\n\t@Autowired\n\tprivate&nbsp;StringRedisTemplate&nbsp;stringRedisTemplate;\n\t@Autowired\n\tprivate&nbsp;RedisLock&nbsp;redisLock;\n&nbsp;\n&nbsp;\n\t@RequestMapping(\"\/setStock\")\n\tpublic&nbsp;String&nbsp;setStock()&nbsp;{\n\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;\"100\");\n\t\treturn&nbsp;\"ok\";\n\t}\n&nbsp;\n\t@RequestMapping(\"\/deductStock\")\n\tpublic&nbsp;String&nbsp;deductStock()&nbsp;{\n\t\t\/\/&nbsp;\u521b\u5efa\u4e00\u4e2akey\uff0c\u4fdd\u5b58\u81f3redis\n\t\tString&nbsp;key&nbsp;=&nbsp;\"lock\";\n\t\tString&nbsp;lock_value&nbsp;=&nbsp;UUID.randomUUID().toString();\n\t\ttry&nbsp;{\n\t\t\tboolean&nbsp;redisLock&nbsp;=&nbsp;this.redisLock.getRedisLock(key,&nbsp;lock_value);\/\/\u83b7\u53d6\u9501\n\t\t\tif&nbsp;(redisLock)\n\t\t\t{\n\t\t\t\t\/\/&nbsp;\u83b7\u53d6Redis\u6570\u636e\u5e93\u4e2d\u7684\u5546\u54c1\u6570\u91cf\n\t\t\t\tInteger&nbsp;stock&nbsp;=&nbsp;Integer.parseInt(stringRedisTemplate.opsForValue().get(\"stock\"));\n\t\t\t\t\/\/&nbsp;\u51cf\u5e93\u5b58\n\t\t\t\tif&nbsp;(stock&nbsp;&gt;&nbsp;0)&nbsp;{\n\t\t\t\t\tint&nbsp;realStock&nbsp;=&nbsp;stock&nbsp;-&nbsp;1;\n\t\t\t\t\tstringRedisTemplate.opsForValue().set(\"stock\",&nbsp;String.valueOf(realStock));\n\t\t\t\t\tSystem.out.println(\"\u5546\u54c1\u6263\u51cf\u6210\u529f\uff0c\u5269\u4f59\u5546\u54c1\uff1a\"&nbsp;+&nbsp;realStock);\n\t\t\t\t}&nbsp;else&nbsp;{\n\t\t\t\t\tSystem.out.println(\"\u5e93\u5b58\u4e0d\u8db3.....\");\n\t\t\t\t}\n\t\t\t}\n\t\t}&nbsp;finally&nbsp;{\n\t\t\tredisLock.unRedisLock(key,lock_value);&nbsp;&nbsp;&nbsp;\/\/\u91ca\u653e\u9501\n\t\t}\n\t\treturn&nbsp;\"end\";\n\t}\n}<\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\u5931\u8d25\u7684\u7ebf\u7a0b\u4e0d\u4f1a\u76f4\u63a5\u7ed3\u675f\uff0c\u800c\u662f\u4f1a\u5c1d\u8bd5\u91cd\u8bd5\uff0c\u4e00\u76f4\u5230\u91cd\u8bd5\u7ed3\u675f\u65f6\u95f4\uff0c\u624d\u4f1a\u7ed3\u675f<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab3870bff.png\" class=\"aligncenter\"><\/p>\n<hr>\n<p>\u5b9e\u9645\u4e0a\u8fd9\u4e2a\u6700\u7ec8\u7248\u4f9d\u7136\u5b58\u57283\u4e2a\u95ee\u9898<\/p>\n<p>1\u3001\u5728finally\u6d41\u7a0b\u4e2d\uff0c\u7531\u4e8e\u662f\u5148\u5224\u65ad\u5728\u5904\u7406\u3002\u5982\u679c\u5224\u65ad\u6761\u4ef6\u7ed3\u675f\u540e\uff0c\u83b7\u53d6\u5230\u7684\u7ed3\u679c\u4e3atrue\u3002\u4f46\u662f\u5728\u6267\u884cdel\u64cd\u4f5c\u524d\uff0c\u6b64\u65f6jvm\u5728\u6267\u884cGC\u64cd\u4f5c(\u4e3a\u4e86\u4fdd\u8bc1GC\u64cd\u4f5c\u83b7\u53d6GC roots\u6839\u5b8c\u5168\uff0c\u4f1a\u6682\u505cjava\u7a0b\u5e8f)\uff0c\u5bfc\u81f4\u7a0b\u5e8f\u6682\u505c\u3002\u6267\u884c\u5b8cGC\u64cd\u4f5c\u540e\uff08\u6062\u590d\u6682\u505c\uff09\uff0c\u5f53\u524d\u52a0\u9501\u7684key\u662f\u5426\u4ecd\u7136\u5b58\u5728\uff0c\u8fd9\u65f6\u8fdb\u884c\u7684del\u64cd\u4f5c\u662f\u5426\u6709\u6548\uff1f<\/p>\n<p>2\u3001\u95ee\u9898\u5982\u56fe\u6240\u793a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230519\/16844501046466ab387b492.png\" class=\"aligncenter\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Springboot\u6574\u5408Redi&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201842","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201842"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201842\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}