{"id":10008275,"date":"2023-09-18T20:28:25","date_gmt":"2023-09-18T12:28:25","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008275"},"modified":"2023-09-18T20:28:25","modified_gmt":"2023-09-18T12:28:25","slug":"%e5%9c%ba%e6%99%af%e9%a2%98%ef%bc%9a%e6%b5%b7%e9%87%8f%e6%95%b0%e6%8d%ae%e5%a6%82%e4%bd%95%e5%88%a4%e9%87%8d%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008275","title":{"rendered":"\u573a\u666f\u9898\uff1a\u6d77\u91cf\u6570\u636e\u5982\u4f55\u5224\u91cd\uff1f"},"content":{"rendered":"<p>\u5728\u6d77\u91cf\u6570\u636e\u5982\u4f55\u786e\u5b9a\u4e00\u4e2a\u503c\u662f\u5426\u5b58\u5728\uff1f\u8fd9\u662f\u4e00\u9053\u975e\u5e38\u7ecf\u5178\u7684\u9762\u8bd5\u573a\u666f\u9898\u3002<\/p>\n<p>\u90a3\u600e\u4e48\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\u5462\uff1f\u63a5\u4e0b\u6765\u54b1\u4eec\u5c31\u8be6\u7ec6\u7684\u804a\u4e00\u804a\u3002<\/p>\n<h2>\u53c2\u8003\u7b54\u6848<\/h2>\n<p>\u5224\u65ad\u4e00\u4e2a\u503c\u662f\u5426\u5b58\u5728\uff1f\u901a\u5e38\u6709\u4ee5\u4e0b\u4e24\u79cd\u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n<ol>\n<li><strong>\u4f7f\u7528\u54c8\u5e0c\u8868<\/strong>\uff1a\u53ef\u4ee5\u5c06\u6570\u636e\u8fdb\u884c\u54c8\u5e0c\u64cd\u4f5c\uff0c\u5c06\u6570\u636e\u5b58\u50a8\u5728\u76f8\u5e94\u7684\u6876\u4e2d\u3002\u67e5\u8be2\u65f6\uff0c\u6839\u636e\u54c8\u5e0c\u503c\u5b9a\u4f4d\u5230\u5bf9\u5e94\u7684\u6876\uff0c\u7136\u540e\u5728\u6876\u5185\u8fdb\u884c\u67e5\u627e\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a 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O(1)\u3002\u5e03\u9686\u8fc7\u6ee4\u5668\u5728\u8fdb\u884c\u67e5\u8be2\u65f6\uff0c\u4e5f\u901a\u8fc7\u591a\u4e2a\u54c8\u5e0c\u51fd\u6570\u8ba1\u7b97\u591a\u4e2a\u4f4d\uff0c\u7136\u540e\u5224\u65ad\u5bf9\u5e94\u7684\u4f4d\u662f\u5426\u90fd\u4e3a 1 \u6765\u786e\u5b9a\u5143\u7d20\u662f\u5426\u5b58\u5728\u3002\u67e5\u8be2\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(k)\uff0c\u5176\u4e2d k 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hash \u503c\u5747\u5300\u7684\u5b58\u50a8\u5728\u4f4d\u6570\u7ec4\u4e2d\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6bcf\u6b21\u6dfb\u52a0\u65f6\u4f1a\u901a\u8fc7\u51e0\u4e2a\u65e0\u504f\u54c8\u5e0c\u51fd\u6570\u7b97\u51fa\u5b83\u7684\u4f4d\u7f6e\uff0c\u628a\u8fd9\u4e9b\u4f4d\u7f6e\u8bbe\u7f6e\u6210 1 \u5c31\u5b8c\u6210\u4e86\u6dfb\u52a0\u64cd\u4f5c\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u5f53\u8fdb\u884c\u5143\u7d20\u5224\u65ad\u65f6\uff0c\u67e5\u8be2\u6b64\u5143\u7d20\u7684\u51e0\u4e2a\u54c8\u5e0c\u4f4d\u7f6e\u4e0a\u7684\u503c\u662f\u5426\u4e3a 1\uff0c\u5982\u679c\u5168\u90e8\u4e3a 1\uff0c\u5219\u8868\u793a\u6b64\u503c\u5b58\u5728\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u503c\u4e3a 0\uff0c\u5219\u8868\u793a\u4e0d\u5b58\u5728\u3002\u56e0\u4e3a\u6b64\u4f4d\u7f6e\u662f\u901a\u8fc7 hash \u8ba1\u7b97\u5f97\u6765\u7684\uff0c\u6240\u4ee5\u5373\u4f7f\u8fd9\u4e2a\u4f4d\u7f6e\u662f 1\uff0c\u5e76\u4e0d\u80fd\u786e\u5b9a\u662f\u90a3\u4e2a\u5143\u7d20\u628a\u5b83\u6807\u8bc6\u4e3a 1 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src=\"https:\/\/cdn.nlark.com\/yuque\/0\/2020\/png\/92791\/1582344940913-5e2a3f2d-3c55-40f7-86f8-62fea187f656.png#averageHue=%23fcfcfc&#038;height=200&#038;id=Gwl8J&#038;originHeight=399&#038;originWidth=882&#038;originalType=binary&#038;ratio=1&#038;rotation=0&#038;showTitle=false&#038;size=30036&#038;status=done&#038;style=none&#038;title=&#038;width=441\" alt=\"image.png\" title=\"image.png\"><\/p>\n<h2>\u5982\u4f55\u5b9e\u73b0\u5e03\u9686\u8fc7\u6ee4\u5668\uff1f<\/h2>\n<p>\u5e03\u9686\u8fc7\u6ee4\u5668\u7684\u5b9e\u73b0\u901a\u5e38\u6709\u4ee5\u4e0b\u4e24\u79cd\u65b9\u6848\uff1a<\/p>\n<ol>\n<li><strong>\u901a\u8fc7\u7a0b\u5e8f\u5b9e\u73b0\uff08\u5185\u5b58\u7ea7\u522b\u65b9\u6848\uff09<\/strong>\uff1a\u4f7f\u7528 Google Guava \u5e93\u548c Apache Commons \u5e93\u5b9e\u73b0\u5e03\u9686\u8fc7\u6ee4\u5668\u3002<\/li>\n<li>\n<p><strong>\u901a\u8fc7\u4e2d\u95f4\u4ef6\u5b9e\u73b0\uff08\u652f\u6301\u6570\u636e\u6301\u4e45\u5316\uff09<\/strong>\uff1a\u4f7f\u7528 Redis 4.0 \u4e4b\u540e\u63d0\u4f9b\u7684\u5e03\u9686\u8fc7\u6ee4\u63d2\u4ef6\u6765\u5b9e\u73b0\uff0c\u5b83\u7684\u597d\u5904\u662f\u652f\u6301\u6301\u4e45\u5316\uff0c\u6570\u636e\u4e0d\u4f1a\u4e22\u5931\u3002<\/p>\n<h2>Guava \u5b9e\u73b0\u5e03\u9686\u8fc7\u6ee4\u5668<\/h2>\n<p>\u4f7f\u7528 Google Guava \u5e93\u5b9e\u73b0\u5e03\u9686\u8fc7\u6ee4\u5668\u603b\u5171\u5206\u4e3a\u4ee5\u4e0b\u4e24\u6b65\uff1a<\/p>\n<\/li>\n<li>\u5f15\u5165 Guava \u4f9d\u8d56<\/li>\n<li>\u4f7f\u7528 Guava API \u64cd\u4f5c\u5e03\u9686\u8fc7\u6ee4\u5668<\/li>\n<\/ol>\n<p>\u5177\u4f53\u5b9e\u73b0\u5982\u4e0b\u3002<\/p>\n<h3>\u2460 \u5f15\u5165 Guava \u4f9d\u8d56<\/h3>\n<pre><code class=\"xml\">&lt;dependency&gt;\n    &lt;groupId&gt;com.google.guava&lt;\/groupId&gt;\n    &lt;artifactId&gt;guava&lt;\/artifactId&gt;\n&lt;\/dependency&gt;<\/code><\/pre>\n<h3>\u2461 \u4f7f\u7528 Guava API<\/h3>\n<pre><code class=\"java\">import com.google.common.hash.BloomFilter;\nimport com.google.common.hash.Funnels;\n\npublic class BloomFilterExample {\n    public static void main(String[] args) {\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u5e03\u9686\u8fc7\u6ee4\u5668\uff0c\u8bbe\u7f6e\u671f\u671b\u63d2\u5165\u7684\u6570\u636e\u91cf\u4e3a10000\uff0c\u671f\u671b\u7684\u8bef\u5224\u7387\u4e3a0.01\n        BloomFilter&lt;String&gt; bloomFilter = BloomFilter.create(Funnels.unencodedCharsFunnel(), 10000, 0.01);\n\n        \/\/ \u5411\u5e03\u9686\u8fc7\u6ee4\u5668\u4e2d\u63d2\u5165\u6570\u636e\n        bloomFilter.put(&quot;data1&quot;);\n        bloomFilter.put(&quot;data2&quot;);\n        bloomFilter.put(&quot;data3&quot;);\n\n        \/\/ \u67e5\u8be2\u5143\u7d20\u662f\u5426\u5b58\u5728\u4e8e\u5e03\u9686\u8fc7\u6ee4\u5668\u4e2d\n        System.out.println(bloomFilter.mightContain(&quot;data1&quot;)); \/\/ true\n        System.out.println(bloomFilter.mightContain(&quot;data4&quot;)); \/\/ false\n    }\n}<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7 BloomFilter.create() \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u5e03\u9686\u8fc7\u6ee4\u5668\uff0c\u6307\u5b9a\u4e86\u5143\u7d20\u5e8f\u5217\u5316\u65b9\u5f0f\u3001\u671f\u671b\u63d2\u5165\u7684\u6570\u636e\u91cf\u548c\u671f\u671b\u7684\u8bef\u5224\u7387\u3002\u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 put() \u65b9\u6cd5\u5411\u5e03\u9686\u8fc7\u6ee4\u5668\u4e2d\u63d2\u5165\u6570\u636e\uff0c\u4f7f\u7528 mightContain() \u65b9\u6cd5\u6765\u5224\u65ad\u5143\u7d20\u662f\u5426\u5b58\u5728\u4e8e\u5e03\u9686\u8fc7\u6ee4\u5668\u4e2d\u3002<\/p>\n<h2>\u5c0f\u7ed3<\/h2>\n<p>\u5728\u6d77\u91cf\u6570\u636e\u5982\u4f55\u786e\u5b9a\u4e00\u4e2a\u503c\u662f\u5426\u5b58\u5728\uff1f\u901a\u5e38\u6709\u4e24\u79cd\u89e3\u51b3\u65b9\u6848\uff1a\u54c8\u5e0c\u8868\u548c\u5e03\u9686\u8fc7\u6ee4\u5668\uff0c\u800c\u5b83\u4eec\u4e24\u90fd\u5b58\u5728\u8bef\u5224\u7684\u60c5\u51b5\uff0c\u4f46\u5e03\u9686\u8fc7\u6ee4\u5668\u66f4\u9002\u5408\u6d77\u91cf\u6570\u636e\u7684\u5224\u65ad\uff0c\u56e0\u4e3a\u5b83\u5360\u7528\u7684\u6570\u636e\u7a7a\u95f4\u66f4\u5c0f\u3002\u5e03\u9686\u8fc7\u6ee4\u5668\u7684\u7279\u5f81\u662f\uff1a<strong>\u5f53\u5e03\u9686\u8fc7\u6ee4\u5668\u8bf4\uff0c\u67d0\u4e2a\u6570\u636e\u5b58\u5728\u65f6\uff0c\u8fd9\u4e2a\u6570\u636e\u53ef\u80fd\u4e0d\u5b58\u5728\uff1b\u5f53\u5e03\u9686\u8fc7\u6ee4\u5668\u8bf4\uff0c\u67d0\u4e2a\u6570\u636e\u4e0d\u5b58\u5728\u65f6\uff0c\u90a3\u4e48\u8fd9\u4e2a\u6570\u636e\u4e00\u5b9a\u4e0d\u5b58\u5728\u3002<\/strong><\/p>\n<blockquote><p>\u672c\u6587\u5df2\u6536\u5f55\u5230\u6211\u7684\u9762\u8bd5\u5c0f\u7ad9 <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=OI25XJ1KkNFimq3Yv2Hqtg%3D%3D.nE%2FvRLPIXrF%2B9Uob3Zh5CCJgyk0pL4OamDbN43mPjLQ%3D\" rel=\"noopener noreferrer\">www.javacn.site<\/a>\uff0c\u5176\u4e2d\u5305\u542b\u7684\u5185\u5bb9\u6709\uff1aRedis\u3001JVM\u3001\u5e76\u53d1\u3001\u5e76\u53d1\u3001MySQL\u3001Spring\u3001Spring MVC\u3001Spring Boot\u3001Spring Cloud\u3001MyBatis\u3001\u8bbe\u8ba1\u6a21\u5f0f\u3001\u6d88\u606f\u961f\u5217\u7b49\u6a21\u5757\u3002<\/p><\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044228579\">https:\/\/segmentfault.com\/a\/1190000044228579<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u6d77\u91cf\u6570\u636e\u5982\u4f55\u786e\u5b9a\u4e00\u4e2a\u503c\u662f\u5426\u5b58\u5728\uff1f\u8fd9\u662f\u4e00\u9053\u975e\u5e38\u7ecf\u5178\u7684\u9762\u8bd5\u573a\u666f\u9898\u3002 \u90a3\u600e\u4e48\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\u5462\uff1f\u63a5\u4e0b\u6765\u54b1\u4eec\u5c31\u8be6\u7ec6\u7684\u804a\u4e00 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008275","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008275","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008275"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008275\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}