{"id":590,"date":"2023-04-10T08:42:34","date_gmt":"2023-03-29T08:05:49","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e4%b8%ad%e7%9a%84%e9%9a%8f%e6%9c%ba%e6%95%b0%e7%94%9f%e6%88%90%e5%99%a8\/"},"modified":"2025-08-02T21:13:11","modified_gmt":"2025-08-02T13:13:11","slug":"java%e4%b8%ad%e7%9a%84%e9%9a%8f%e6%9c%ba%e6%95%b0%e7%94%9f%e6%88%90%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84%e9%9a%8f%e6%9c%ba%e6%95%b0%e7%94%9f%e6%88%90%e5%99%a8\/","title":{"rendered":"Java\u968f\u673a\u6570\u751f\u6210\u5668\u5b8c\u5168\u6307\u5357\uff1a\u4eceRandom\u5230SecureRandom\u7684\u5b9e\u7528\u6280\u5de7\u4e0e\u4ee3\u7801\u793a\u4f8b"},"content":{"rendered":"<p>\u4eca\u5929\u6211\u4eec\u5c06\u63a2\u8ba8\u5982\u4f55\u5728Java\u4e2d\u751f\u6210\u968f\u673a\u6570\u3002\u5728Java\u7a0b\u5e8f\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u751f\u6210\u968f\u673a\u6570\u3002\u4f8b\u5982\uff0c\u5728\u63b7\u9ab0\u5b50\u6e38\u620f\u4e2d\u6a21\u62df\u968f\u673a\u7ed3\u679c\uff0c\u6216\u8005\u4e3a\u4e86\u52a0\u5bc6\u76ee\u7684\u751f\u6210\u4e00\u4e2a\u968f\u673a\u5bc6\u94a5ID\u7b49\u573a\u666f\u3002<\/p>\n<h2>Java\u4e2d\u7684\u968f\u673a\u6570\u751f\u6210\u5668<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"Java\u968f\u673a\u6570\u751f\u6210\u5668\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/656478d1a4b2f92e6c72aca7\/2-0.png\" alt=\"Java\u968f\u673a\u6570\u751f\u6210\u5668\" \/><\/div>\n<ul>\n<li><strong>java.util.Random\u7c7b<\/strong>\uff1a\u53ef\u4ee5\u7528\u4e8e\u751f\u6210\u968f\u673a\u6570\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u751f\u6210\u968f\u673a\u6574\u6570\u3001\u957f\u6574\u6570\u3001\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u7b49\u3002<\/li>\n<li><strong>Math.random()\u65b9\u6cd5<\/strong>\uff1a\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528Math.random()\u6765\u751f\u6210\u4e00\u4e2a\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u3002\u8fd9\u4e2a\u65b9\u6cd5\u5728\u5185\u90e8\u4f7f\u7528\u4e86Java Random\u7c7b\u3002<\/li>\n<li><strong>java.util.concurrent.ThreadLocalRandom\u7c7b<\/strong>\uff1a\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u5e94\u8be5\u4f7f\u7528ThreadLocalRandom\u7c7b\u6765\u751f\u6210\u968f\u673a\u6570\u3002\u8fd9\u4e2a\u7c7b\u662fJava\u5e76\u53d1\u5305\u7684\u4e00\u90e8\u5206\uff0c\u4eceJava 1.7\u7248\u672c\u5f00\u59cb\u5f15\u5165\u3002\u8be5\u7c7b\u63d0\u4f9b\u4e86\u7c7b\u4f3c\u4e8eJava Random\u7c7b\u7684\u65b9\u6cd5\u3002<\/li>\n<li><strong>java.security.SecureRandom\u7c7b<\/strong>\uff1a\u53ef\u4ee5\u7528\u4e8e\u751f\u6210\u5177\u6709\u5f3a\u5b89\u5168\u6027\u7684\u968f\u673a\u6570\u3002\u8fd9\u4e2a\u7c7b\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5bc6\u7801\u5b66\u4e0a\u5f3a\u5927\u7684\u968f\u673a\u6570\u751f\u6210\u5668\u3002\u4f46\u662f\uff0c\u5b83\u7684\u5904\u7406\u901f\u5ea6\u8f83\u6162\u3002\u56e0\u6b64\uff0c\u6839\u636e\u60a8\u7684\u5e94\u7528\u9700\u6c42\uff0c\u60a8\u5e94\u8be5\u51b3\u5b9a\u662f\u5426\u4f7f\u7528\u5b83\u3002<\/li>\n<\/ul>\n<h2>Java\u968f\u673a\u6570\u751f\u6210\u793a\u4f8b<\/h2>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e9b\u5728Java\u4e2d\u751f\u6210\u968f\u673a\u6570\u7684\u793a\u4f8b\u3002\u7a0d\u540e\uff0c\u6211\u4eec\u8fd8\u5c06\u4ecb\u7ecdThreadLocalRandom\u548cSecureRandom\u7684\u793a\u4f8b\u7a0b\u5e8f\u3002<\/p>\n<h3>1. \u751f\u6210\u968f\u673a\u6574\u6570<\/h3>\n<pre class=\"post-pre\"><code>Random random = new Random();\r\n\r\nint rand = random.nextInt();\r\n<\/code><\/pre>\n<p>\u662f\u7684\uff0c\u5728Java\u4e2d\u751f\u6210\u968f\u673a\u6574\u6570\u5c31\u662f\u8fd9\u4e48\u7b80\u5355\u3002\u5f53\u6211\u4eec\u521b\u5efaRandom\u5b9e\u4f8b\u65f6\uff0c\u5b83\u4f1a\u751f\u6210\u4e00\u4e2a\u957f\u6574\u578b\u7684\u79cd\u5b50\u503c\uff0c\u7528\u4e8e\u6240\u6709\u7684nextXXX\u65b9\u6cd5\u8c03\u7528\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u8bbe\u7f6e\u8fd9\u4e2a\u79cd\u5b50\u503c\uff0c\u4f46\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u662f\u4e0d\u9700\u8981\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code>\/\/\u4f7f\u7528Random\u6784\u9020\u51fd\u6570\u8bbe\u7f6e\u957f\u6574\u578b\u79cd\u5b50\u503c\r\nRandom random = new Random(123456789);\r\n\r\n\/\/\u4f7f\u7528setter\u65b9\u6cd5\u8bbe\u7f6e\u957f\u6574\u578b\u79cd\u5b50\u503c\r\nRandom random1 = new Random();\r\nrandom1.setSeed(1234567890);\r\n<\/code><\/pre>\n<h3>2. \u751f\u62101\u523010\u4e4b\u95f4\u7684\u968f\u673a\u6570<\/h3>\n<p>\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u5728\u4e00\u4e2a\u7279\u5b9a\u8303\u56f4\u5185\u751f\u6210\u968f\u673a\u6570\u3002\u4f8b\u5982\uff0c\u5728\u63b7\u9ab0\u5b50\u6e38\u620f\u4e2d\uff0c\u53ef\u80fd\u7684\u53d6\u503c\u53ea\u67091\u52306\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u57281\u523010\u4e4b\u95f4\u751f\u6210\u4e00\u4e2a\u5305\u542b\u8fb9\u754c\u7684\u968f\u673a\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>Random random = new Random();\r\nint rand = 0;\r\nwhile (true){\r\n    rand = random.nextInt(11);\r\n    if(rand !=0) break;\r\n}\r\nSystem.out.println(rand);\r\n<\/code><\/pre>\n<p>\u5728nextInt(int x)\u65b9\u6cd5\u4e2d\uff0c\u53c2\u6570\u503c\u88ab\u6392\u9664\u5728\u968f\u673a\u6570\u8303\u56f4\u4e4b\u5916\uff0c\u56e0\u6b64\u6211\u4eec\u5fc5\u987b\u63d0\u4f9b\u53c2\u6570\u4e3a11\u3002\u53e6\u5916\uff0c\u751f\u6210\u7684\u968f\u673a\u6570\u5305\u62ec0\uff0c\u6240\u4ee5\u6211\u4eec\u5fc5\u987b\u4e0d\u65ad\u8c03\u7528nextInt\u65b9\u6cd5\uff0c\u76f4\u5230\u83b7\u5f971\u523010\u4e4b\u95f4\u7684\u503c\u3002\u60a8\u53ef\u4ee5\u6269\u5c55\u4ee5\u4e0a\u4ee3\u7801\u4ee5\u5728\u4efb\u4f55\u7ed9\u5b9a\u7684\u8303\u56f4\u5185\u751f\u6210\u968f\u673a\u6570\u3002<\/p>\n<h3>3. \u751f\u6210\u968f\u673a\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u5728Java\u4e2d\u4f7f\u7528Math.random()\u6216Random\u7c7b\u7684nextDouble\u65b9\u6cd5\u751f\u6210\u968f\u673a\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>Random random = new Random();\r\n\r\ndouble d = random.nextDouble();\r\n\r\ndouble d1 = Math.random();\r\n<\/code><\/pre>\n<h3>4. \u751f\u6210\u968f\u673a\u6d6e\u70b9\u6570<\/h3>\n<pre class=\"post-pre\"><code>Random random = new Random();\r\n\r\nfloat f = random.nextFloat();\r\n<\/code><\/pre>\n<h3>5. \u751f\u6210\u968f\u673a\u957f\u6574\u578b\u6570<\/h3>\n<pre class=\"post-pre\"><code>Random random = new Random();\r\n\r\nlong l = random.nextLong();\r\n<\/code><\/pre>\n<h3>6. \u751f\u6210\u968f\u673a\u5e03\u5c14\u503c<\/h3>\n<pre class=\"post-pre\"><code>Random random = new Random();\r\n\r\nboolean flag = random.nextBoolean();\r\n<\/code><\/pre>\n<h3>7. \u751f\u6210\u968f\u673a\u5b57\u8282\u6570\u7ec4<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Random\u7c7b\u751f\u6210\u968f\u673a\u5b57\u8282\uff0c\u5e76\u5c06\u5b83\u4eec\u653e\u5165\u7528\u6237\u63d0\u4f9b\u7684\u5b57\u8282\u6570\u7ec4\u4e2d\u3002\u751f\u6210\u7684\u968f\u673a\u5b57\u8282\u6570\u91cf\u7b49\u4e8e\u5b57\u8282\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<pre class=\"post-pre\"><code>Random random = new Random();\r\n\r\nbyte[] randomByteArray = new byte[5];\r\n\r\nrandom.nextBytes(randomByteArray);\r\n\r\nSystem.out.println(Arrays.toString(randomByteArray)); \/\/ \u793a\u4f8b\u8f93\u51fa [-70, -57, 74, 99, -78]\r\n<\/code><\/pre>\n<h3>8. \u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684ThreadLocalRandom<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u4f7f\u7528ThreadLocalRandom\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.randomnumber;\r\n\r\nimport java.util.Random;\r\nimport java.util.concurrent.ThreadLocalRandom;\r\n\r\npublic class ThreadLocalRandomExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tRunnable runnable = new MyRunnable();\r\n\r\n\t\tfor (int i = 0; i < 5; i++) {\r\n\t\t\tThread t = new Thread(runnable);\r\n\t\t\tt.setName(\"MyRunnable-Thread-\" + i);\r\n\t\t\tt.start();\r\n\t\t}\r\n\t}\r\n\r\n}\r\n\r\nclass MyRunnable implements Runnable {\r\n\r\n\t@Override\r\n\tpublic void run() {\r\n\t\tString threadName = Thread.currentThread().getName();\r\n\t\tSystem.out.println(threadName + \"::\" + ThreadLocalRandom.current().nextInt());\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u6211\u6267\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u7684\u793a\u4f8b\u8f93\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code>MyRunnable-Thread-0::-1744088963\r\nMyRunnable-Thread-3::139405798\r\nMyRunnable-Thread-1::1403710182\r\nMyRunnable-Thread-2::-1222080205\r\nMyRunnable-Thread-4::-185825276\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"ThreadLocalRandom\u793a\u4f8b\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/656478d1a4b2f92e6c72aca7\/31-0.png\" alt=\"ThreadLocalRandom\u793a\u4f8b\" \/><\/div>\n<pre class=\"post-pre\"><code>ThreadLocalRandom random = ThreadLocalRandom.current();\r\n\t\t\r\nint rand = random.nextInt(1, 11);\r\n<\/code><\/pre>\n<p>ThreadLocalRandom\u63d0\u4f9b\u7c7b\u4f3c\u7684\u65b9\u6cd5\u6765\u751f\u6210\u968f\u673a\u7684\u957f\u6574\u578b\u548c\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u503c\u3002<\/p>\n<h3>9. SecureRandom\u793a\u4f8b<\/h3>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528SecureRandom\u7c7b\u4f7f\u7528\u4efb\u4f55\u63d0\u4f9b\u7684\u63d0\u4f9b\u7a0b\u5e8f\u751f\u6210\u66f4\u5b89\u5168\u7684\u968f\u673a\u6570\u3002\u4e0b\u9762\u7ed9\u51fa\u4e86\u4e00\u4e2a\u5feb\u901f\u7684SecureRandom\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code>Random random = new SecureRandom();\r\n\r\nint rand = random.nextInt();\r\n\r\nSystem.out.println(rand);\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8e\u5728Java\u7a0b\u5e8f\u4e2d\u751f\u6210\u968f\u673a\u6570\u7684\u5168\u90e8\u5185\u5bb9\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u4ee3\u7801\u5e93\u4e0b\u8f7d\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929\u6211\u4eec\u5c06\u63a2\u8ba8\u5982\u4f55\u5728Java\u4e2d\u751f\u6210\u968f\u673a\u6570\u3002\u5728Java\u7a0b\u5e8f\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u751f\u6210\u968f\u673a\u6570\u3002\u4f8b\u5982\uff0c\u5728\u63b7\u9ab0\u5b50\u6e38\u620f\u4e2d\u6a21 [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[180,1695,1696,1697,865],"class_list":{"0":"post-590","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","9":"tag-random","10":"tag-securerandom","11":"tag-865"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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