{"id":122910,"date":"2024-03-24T09:01:28","date_gmt":"2024-03-24T00:01:28","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/go%e8%a8%80%e8%aa%9e%e3%81%a7%e4%b8%a6%e8%a1%8c%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%81%ae%e5%95%8f%e9%a1%8c%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99\/"},"modified":"2024-03-27T01:41:50","modified_gmt":"2024-03-26T16:41:50","slug":"go%e8%a8%80%e8%aa%9e%e3%81%a7%e4%b8%a6%e8%a1%8c%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%81%ae%e5%95%8f%e9%a1%8c%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/go%e8%a8%80%e8%aa%9e%e3%81%a7%e4%b8%a6%e8%a1%8c%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%81%ae%e5%95%8f%e9%a1%8c%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99\/","title":{"rendered":"Go\u8a00\u8a9e\u3067\u4e26\u884c\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Go\u8a00\u8a9e\u3067\u306f\u3001\u975e\u540c\u671f\u306e\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u554f\u984c\u3092 goroutine \u3068 channel \u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u7c21\u5358\u306a\u5b9f\u88c5\u624b\u9806\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30d5\u30a1\u30a4\u30eb\u60c5\u5831\u3092\u683c\u7d0d\u3059\u308b\u69cb\u9020\u4f53\u3092\u4f5c\u6210\u3059\u308b\uff08\u30d5\u30a1\u30a4\u30ebURL\u3001\u30d5\u30a1\u30a4\u30eb\u540d\u306a\u3069\uff09\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">type<\/span> File <span class=\"hljs-keyword\">struct<\/span> {\r\nURL      <span class=\"hljs-type\">string<\/span>\r\nFileName <span class=\"hljs-type\">string<\/span>\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>HTTP\u30d1\u30c3\u30b1\u30fc\u30b8\u306eGet\u95a2\u6570\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u3001\u30d5\u30a1\u30a4\u30eb\u60c5\u5831\u3092\u5f15\u6570\u3068\u3057\u3066\u53d7\u3051\u53d6\u3063\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u95a2\u6570\u3092\u751f\u6210\u3059\u308b\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">DownloadFile<\/span><span class=\"hljs-params\">(file File)<\/span><\/span> {\r\nresponse, err := http.Get(file.URL)\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\nfmt.Println(<span class=\"hljs-string\">\"\u4e0b\u8f7d\u6587\u4ef6\u5931\u8d25:\"<\/span>, file.URL)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\n<span class=\"hljs-keyword\">defer<\/span> response.Body.Close()\r\nout, err := os.Create(file.FileName)\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\nfmt.Println(<span class=\"hljs-string\">\"\u521b\u5efa\u6587\u4ef6\u5931\u8d25:\"<\/span>, file.FileName)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\n<span class=\"hljs-keyword\">defer<\/span> out.Close()\r\n_, err = io.Copy(out, response.Body)\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\nfmt.Println(<span class=\"hljs-string\">\"\u4fdd\u5b58\u6587\u4ef6\u5931\u8d25:\"<\/span>, file.FileName)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\nfmt.Println(<span class=\"hljs-string\">\"\u4e0b\u8f7d\u6587\u4ef6\u6210\u529f:\"<\/span>, file.FileName)\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>\u30d5\u30a1\u30a4\u30eb\u60c5\u5831\u306e\u30b9\u30e9\u30a4\u30b9\u3092\u53d7\u3051\u53d6\u308a\u3001goroutine\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u4e26\u5217\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u95a2\u6570\u3092\u4f5c\u6210\u3059\u308b\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">ConcurrentDownload<\/span><span class=\"hljs-params\">(files []File)<\/span><\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u65e0\u7f13\u51b2\u7684channel\uff0c\u7528\u4e8e\u63a7\u5236\u5e76\u53d1\u6570<\/span>\r\nsemaphore := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">struct<\/span>{}, <span class=\"hljs-number\">5<\/span>)\r\n<span class=\"hljs-keyword\">defer<\/span> <span class=\"hljs-built_in\">close<\/span>(semaphore)\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u7b49\u5f85\u7ec4\uff0c\u7528\u4e8e\u7b49\u5f85\u6240\u6709\u6587\u4ef6\u4e0b\u8f7d\u5b8c\u6210<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> wg sync.WaitGroup\r\n<span class=\"hljs-keyword\">for<\/span> _, file := <span class=\"hljs-keyword\">range<\/span> files {\r\n<span class=\"hljs-comment\">\/\/ \u5411\u7b49\u5f85\u7ec4\u6dfb\u52a0\u4e00\u4e2a\u4efb\u52a1<\/span>\r\nwg.Add(<span class=\"hljs-number\">1<\/span>)\r\n<span class=\"hljs-comment\">\/\/ \u542f\u52a8\u4e00\u4e2agoroutine\u6765\u4e0b\u8f7d\u6587\u4ef6<\/span>\r\n<span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">(file File)<\/span><\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u4ecechannel\u4e2d\u83b7\u53d6\u4e00\u4e2a\u4fe1\u53f7\u91cf<\/span>\r\nsemaphore &lt;- <span class=\"hljs-keyword\">struct<\/span>{}{}\r\n<span class=\"hljs-comment\">\/\/ \u6267\u884c\u4e0b\u8f7d\u6587\u4ef6\u64cd\u4f5c<\/span>\r\nDownloadFile(file)\r\n<span class=\"hljs-comment\">\/\/ \u91ca\u653e\u4e00\u4e2a\u4fe1\u53f7\u91cf\u5230channel<\/span>\r\n&lt;-semaphore\r\n<span class=\"hljs-comment\">\/\/ \u4efb\u52a1\u5b8c\u6210\uff0c\u4ece\u7b49\u5f85\u7ec4\u4e2d\u5220\u9664\u4e00\u4e2a\u4efb\u52a1<\/span>\r\nwg.Done()\r\n}(file)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u7b49\u5f85\u6240\u6709\u4efb\u52a1\u5b8c\u6210<\/span>\r\nwg.Wait()\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>\u30e1\u30a4\u30f3\u95a2\u6570\u304b\u3089\u4e26\u5217\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u3001\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u304c\u5fc5\u8981\u306a\u30d5\u30a1\u30a4\u30eb\u60c5\u5831\u306e\u914d\u5217\u3092\u6e21\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span><\/span> {\r\nfiles := []File{\r\n{URL: <span class=\"hljs-string\">\"http:\/\/example.com\/file1.txt\"<\/span>, FileName: <span class=\"hljs-string\">\"file1.txt\"<\/span>},\r\n{URL: <span class=\"hljs-string\">\"http:\/\/example.com\/file2.txt\"<\/span>, FileName: <span class=\"hljs-string\">\"file2.txt\"<\/span>},\r\n{URL: <span class=\"hljs-string\">\"http:\/\/example.com\/file3.txt\"<\/span>, FileName: <span class=\"hljs-string\">\"file3.txt\"<\/span>},\r\n}\r\nConcurrentDownload(files)\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u306fgoroutine\u3068channel\u3092\u4f7f\u7528\u3057\u3066\u30b4\u30eb\u30fc\u30c1\u30f3\u5185\u3067\u540c\u6642\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u57fa\u672c\u624b\u9806\u3067\u3059\u3002goroutine\u306e\u4e26\u5217\u51e6\u7406\u756a\u53f7\u3092\u5236\u5fa1\u3059\u308b\u3053\u3068\u3067\u3001\u4e26\u5217\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u6570\u3092\u52b9\u679c\u7684\u306b\u5236\u5fa1\u3057\u3001\u30b5\u30fc\u30d0\u30fc\u306b\u5927\u304d\u306a\u8ca0\u8377\u5727\u529b\u304c\u304b\u304b\u308a\u3059\u304e\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Go\u8a00\u8a9e\u3067\u306f\u3001\u975e\u540c\u671f\u306e\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u554f\u984c\u3092 goroutine \u3068 channel \u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u7c21\u5358\u306a\u5b9f\u88c5\u624b\u9806\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002 \u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30d5\u30a1\u30a4\u30eb\u60c5\u5831\u3092\u683c\u7d0d\u3059\u308b\u69cb\u9020\u4f53\u3092\u4f5c\u6210\u3059\u308b\uff08\u30d5\u30a1\u30a4\u30ebURL\u3001\u30d5\u30a1\u30a4\u30eb\u540d\u306a\u3069 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-122910","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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content=\"Go\u8a00\u8a9e\u3067\u306f\u3001\u975e\u540c\u671f\u306e\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u554f\u984c\u3092 goroutine \u3068 channel \u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u7c21\u5358\u306a\u5b9f\u88c5\u624b\u9806\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002 \u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30d5\u30a1\u30a4\u30eb\u60c5\u5831\u3092\u683c\u7d0d\u3059\u308b\u69cb\u9020\u4f53\u3092\u4f5c\u6210\u3059\u308b\uff08\u30d5\u30a1\u30a4\u30ebURL\u3001\u30d5\u30a1\u30a4\u30eb\u540d\u306a\u3069 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/go\u8a00\u8a9e\u3067\u4e26\u884c\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-24T00:01:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-26T16:41:50+00:00\" \/>\n<meta name=\"author\" content=\"\u6d77\u6597, \u8475\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u6d77\u6597, \u8475\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u5206\" \/>\n<script type=\"application\/ld+json\" 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