{"id":104967,"date":"2024-03-22T09:06:44","date_gmt":"2024-03-22T00:06:44","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%81%a8%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f\/"},"modified":"2024-04-04T18:46:25","modified_gmt":"2024-04-04T09:46:25","slug":"java-%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%81%a8%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%81%a8%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f\/","title":{"rendered":"Java \u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3068\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u306f\u3001Apache Commons FileUpload\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3001Java \u306eIO\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u624b\u9806\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>enctype=&#8221;multipart\/form-data&#8221;<\/li>\n<li>Java\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u8981\u6c42\u3092\u53d7\u3051\u53d6\u308b\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059.<\/li>\n<li>\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30fb\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u30a2\u30a4\u30c6\u30e0<\/li>\n<li>\u65e5\u672c\u4eba\u306b\u306f\u3001\u4f1d\u7d71\u7684\u306b\u98df\u3079\u7269\u3092\u7121\u99c4\u306b\u3059\u308b\u3053\u3068\u3092\u5acc\u304c\u308b\u98a8\u7fd2\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u7c21\u5358\u306a\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u306e\u305f\u3081\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.commons.fileupload.servlet.ServletFileUpload;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.commons.fileupload.disk.DiskFileItemFactory;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.commons.fileupload.FileItem;\r\n\r\n<span class=\"hljs-meta\">@WebServlet(\"\/upload\")<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">FileUploadServlet<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">HttpServlet<\/span> {\r\n    <span class=\"hljs-keyword\">protected<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">doPost<\/span><span class=\"hljs-params\">(HttpServletRequest request, HttpServletResponse response)<\/span> <span class=\"hljs-keyword\">throws<\/span> ServletException, IOException {\r\n        <span class=\"hljs-comment\">\/\/ \u68c0\u67e5\u8bf7\u6c42\u662f\u5426\u4e3a\u6587\u4ef6\u4e0a\u4f20<\/span>\r\n        <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-variable\">isMultipart<\/span> <span class=\"hljs-operator\">=<\/span> ServletFileUpload.isMultipartContent(request);\r\n        <span class=\"hljs-keyword\">if<\/span> (!isMultipart) {\r\n            response.getWriter().println(<span class=\"hljs-string\">\"\u4e0d\u662f\u6587\u4ef6\u4e0a\u4f20\u8bf7\u6c42\"<\/span>);\r\n            <span class=\"hljs-keyword\">return<\/span>;\r\n        }\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u6587\u4ef6\u4e0a\u4f20\u5de5\u5382\u7c7b\u548cServletFileUpload\u5bf9\u8c61<\/span>\r\n        <span class=\"hljs-type\">DiskFileItemFactory<\/span> <span class=\"hljs-variable\">factory<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DiskFileItemFactory<\/span>();\r\n        <span class=\"hljs-type\">ServletFileUpload<\/span> <span class=\"hljs-variable\">upload<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ServletFileUpload<\/span>(factory);\r\n\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            <span class=\"hljs-comment\">\/\/ \u89e3\u6790\u4e0a\u4f20\u7684\u6587\u4ef6\u6570\u636e<\/span>\r\n            List&lt;FileItem&gt; items = upload.parseRequest(request);\r\n            <span class=\"hljs-keyword\">for<\/span> (FileItem item : items) {\r\n                <span class=\"hljs-comment\">\/\/ \u5224\u65ad\u662f\u5426\u4e3a\u666e\u901a\u8868\u5355\u5b57\u6bb5<\/span>\r\n                <span class=\"hljs-keyword\">if<\/span> (item.isFormField()) {\r\n                    <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">fieldName<\/span> <span class=\"hljs-operator\">=<\/span> item.getFieldName();\r\n                    <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">fieldValue<\/span> <span class=\"hljs-operator\">=<\/span> item.getString();\r\n                    <span class=\"hljs-comment\">\/\/ \u5904\u7406\u666e\u901a\u8868\u5355\u5b57\u6bb5\u6570\u636e<\/span>\r\n                } <span class=\"hljs-keyword\">else<\/span> {\r\n                    <span class=\"hljs-comment\">\/\/ \u662f\u6587\u4ef6\u5b57\u6bb5\uff0c\u83b7\u53d6\u6587\u4ef6\u540d\u548c\u5185\u5bb9<\/span>\r\n                    <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">fileName<\/span> <span class=\"hljs-operator\">=<\/span> item.getName();\r\n                    <span class=\"hljs-type\">InputStream<\/span> <span class=\"hljs-variable\">fileContent<\/span> <span class=\"hljs-operator\">=<\/span> item.getInputStream();\r\n                    <span class=\"hljs-comment\">\/\/ \u5c06\u6587\u4ef6\u5199\u5165\u78c1\u76d8\u6216\u5904\u7406\u6587\u4ef6\u5185\u5bb9<\/span>\r\n                }\r\n            }\r\n            response.getWriter().println(<span class=\"hljs-string\">\"\u6587\u4ef6\u4e0a\u4f20\u6210\u529f\"<\/span>);\r\n        } <span class=\"hljs-keyword\">catch<\/span> (Exception e) {\r\n            response.getWriter().println(<span class=\"hljs-string\">\"\u6587\u4ef6\u4e0a\u4f20\u5931\u8d25: \"<\/span> + e.getMessage());\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u30d5\u30a1\u30a4\u30eb\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u624b\u9806\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u8981\u6c42\u306b\u5bfe\u5fdc\u3059\u308b\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li>\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8<\/li>\n<li>Java\u306eIO\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u3066\u305d\u306e\u5185\u5bb9\u3092\u8aad\u307f\u8fbc\u307f\u3001\u305d\u308c\u3092\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u51fa\u529b\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u66f8\u304d\u8fbc\u307f\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u7c21\u5358\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">@WebServlet(\"\/download\")<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">FileDownloadServlet<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">HttpServlet<\/span> {\r\n    <span class=\"hljs-keyword\">protected<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">doGet<\/span><span class=\"hljs-params\">(HttpServletRequest request, HttpServletResponse response)<\/span> <span class=\"hljs-keyword\">throws<\/span> ServletException, IOException {\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u8981\u4e0b\u8f7d\u7684\u6587\u4ef6\u8def\u5f84<\/span>\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">filePath<\/span> <span class=\"hljs-operator\">=<\/span> getServletContext().getRealPath(<span class=\"hljs-string\">\"\/path\/to\/file\"<\/span>);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u8bbe\u7f6e\u54cd\u5e94\u7684Content-Type\u548cContent-Disposition\u5934<\/span>\r\n        response.setContentType(<span class=\"hljs-string\">\"application\/octet-stream\"<\/span>);\r\n        response.setHeader(<span class=\"hljs-string\">\"Content-Disposition\"<\/span>, <span class=\"hljs-string\">\"attachment; filename=\"<\/span> + fileName);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u5e76\u5c06\u5185\u5bb9\u5199\u5165\u54cd\u5e94\u7684\u8f93\u51fa\u6d41<\/span>\r\n        <span class=\"hljs-type\">InputStream<\/span> <span class=\"hljs-variable\">fileContent<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileInputStream<\/span>(filePath);\r\n        <span class=\"hljs-type\">OutputStream<\/span> <span class=\"hljs-variable\">responseOutput<\/span> <span class=\"hljs-operator\">=<\/span> response.getOutputStream();\r\n        <span class=\"hljs-type\">byte<\/span>[] buffer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">byte<\/span>[<span class=\"hljs-number\">4096<\/span>];\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">bytesRead<\/span> <span class=\"hljs-operator\">=<\/span> -<span class=\"hljs-number\">1<\/span>;\r\n        <span class=\"hljs-keyword\">while<\/span> ((bytesRead = fileContent.read(buffer)) != -<span class=\"hljs-number\">1<\/span>) {\r\n            responseOutput.write(buffer, <span class=\"hljs-number\">0<\/span>, bytesRead);\r\n        }\r\n        fileContent.close();\r\n        responseOutput.close();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u30b3\u30fc\u30c9\u5185\u306e\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u3084\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u3001\u5b9f\u969b\u306e\u72b6\u6cc1\u306b\u5408\u308f\u305b\u3066\u4fee\u6b63\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001Apache Commons FileUpload\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3001Java \u306eIO\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u304c\u53ef\u80fd\u3067\u3059\u3002 \u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u624b\u9806\u3092\u4ee5\u4e0b [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-104967","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\/ -->\n<title>Java \u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3068\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\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.silicloud.com\/ja\/blog\/java-\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3068\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u5b9f\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3068\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u306f\u3001Apache Commons FileUpload\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3001Java \u306eIO\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30d5\u30a1\u30a4\u30eb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u304c\u53ef\u80fd\u3067\u3059\u3002 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