{"id":578,"date":"2023-11-09T09:39:41","date_gmt":"2022-07-04T09:50:20","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%82%b5%e3%83%bc%e3%83%96%e3%83%ac%e3%83%83%e3%83%88%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%9f%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\/"},"modified":"2025-08-01T00:45:45","modified_gmt":"2025-07-31T15:45:45","slug":"%e3%82%b5%e3%83%bc%e3%83%96%e3%83%ac%e3%83%83%e3%83%88%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%9f%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","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%82%b5%e3%83%bc%e3%83%96%e3%83%ac%e3%83%83%e3%83%88%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%9f%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\/","title":{"rendered":"\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3092\u4f7f\u3063\u305f\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3068\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u306e\u4f8b"},"content":{"rendered":"<p>Java\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u300cServlet\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u300d\u3068\u300c\u30d5\u30a1\u30a4\u30eb\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u300d\u306f\u4e00\u822c\u7684\u306a\u30bf\u30b9\u30af\u3067\u3059\u3002\u6700\u8fd1Java\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306b\u3064\u3044\u3066\u591a\u304f\u306e\u8a18\u4e8b\u3092\u66f8\u3044\u3066\u304d\u305f\u306e\u3067\u3001\u30b5\u30f3\u30d7\u30eb\u3068\u3057\u3066\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306e\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u306e\u4f8b\u3092\u30b5\u30fc\u30d0\u30fc\u306b\u63d0\u4f9b\u3057\u3001\u305d\u308c\u3092\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b<\/h2>\n<p>\u5f53\u793e\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30ed\u30fc\u30ab\u30eb\u30d5\u30a1\u30a4\u30eb\u3092\u9078\u629e\u3057\u3066\u30b5\u30fc\u30d0\u30fc\u306b\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3067\u304d\u308b\u30b7\u30f3\u30d7\u30eb\u306aHTML\u30da\u30fc\u30b8\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u305f\u3081\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u63d0\u51fa\u3059\u308b\u3068\u3001\u5f53\u793e\u306e\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u30d5\u30a1\u30a4\u30eb\u3092\u30b5\u30fc\u30d0\u30fc\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30d5\u30a1\u30a4\u30eb\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3067\u304d\u308bURL\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u7406\u7531\u304b\u3089\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u30d5\u30a1\u30a4\u30eb\u306e\u76f4\u63a5\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9URL\u306f\u63d0\u4f9b\u3055\u308c\u305a\u3001\u4ee3\u308f\u308a\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30ea\u30f3\u30af\u304c\u63d0\u4f9b\u3055\u308c\u3001\u5f53\u793e\u306e\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u304c\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3057\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u30e6\u30fc\u30b6\u30fc\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002Eclipse\u3067\u52d5\u7684\u306aWeb\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u69cb\u9020\u306f\u4ee5\u4e0b\u306e\u753b\u50cf\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u3059\u3079\u3066\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u898b\u3066\u3001\u5b9f\u88c5\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u306e\u305f\u3081\u306eJava HTML \u30da\u30fc\u30b8<\/h3>\n<p>\u30d5\u30a9\u30fc\u30e0\u3092\u9001\u4fe1\u3057\u3001POST\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306b\u9001\u4fe1\u3059\u308b\u3053\u3068\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u30b5\u30fc\u30d0\u30fc\u306b\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u305f\u3081\u306bGET\u30e1\u30bd\u30c3\u30c9\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\u307e\u305f\u3001\u30d5\u30a9\u30fc\u30e0\u306eenctype\u306fmultipart\/form-data\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u306e\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u304b\u3089\u30d5\u30a1\u30a4\u30eb\u3092\u9078\u629e\u3059\u308b\u306b\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u5165\u529b\u8981\u7d20\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u305f\u3081\u306e\u30b7\u30f3\u30d7\u30eb\u306aHTML\u30da\u30fc\u30b8index.html\u3092\u7528\u610f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>&lt;html&gt;\r\n&lt;head&gt;&lt;\/head&gt;\r\n&lt;body&gt;\r\n&lt;form action=\"UploadDownloadFileServlet\" method=\"post\" enctype=\"multipart\/form-data\"&gt;\r\nSelect File to Upload:&lt;input type=\"file\" name=\"fileName\"&gt;\r\n&lt;br&gt;\r\n&lt;input type=\"submit\" value=\"Upload\"&gt;\r\n&lt;\/form&gt;\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;\r\n<\/code><\/pre>\n<h3>\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u306e\u305f\u3081\u306e\u30b5\u30fc\u30d0\u30fc\u30d5\u30a1\u30a4\u30eb\u306e\u5834\u6240<\/h3>\n<p>\u79c1\u305f\u3061\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u7279\u5b9a\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u5b58\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u5185\u3067\u3053\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u30cf\u30fc\u30c9\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u3088\u308a\u67d4\u8edf\u6027\u3092\u6301\u305f\u305b\u308b\u305f\u3081\u306b\u3001\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u8a18\u8ff0\u5b50\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u8a2d\u5b9a\u53ef\u80fd\u306b\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u30d5\u30a1\u30a4\u30eb\u306eHTML\u30da\u30fc\u30b8\u3092\u30a6\u30a7\u30eb\u30ab\u30e0\u30d5\u30a1\u30a4\u30eb\u30ea\u30b9\u30c8\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306bweb.xml\u30d5\u30a1\u30a4\u30eb\u304c\u898b\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;\r\n&lt;web-app xmlns:xsi=\"https:\/\/www.w3.org\/2001\/XMLSchema-instance\" xmlns=\"https:\/\/java.sun.com\/xml\/ns\/javaee\" xsi:schemaLocation=\"https:\/\/java.sun.com\/xml\/ns\/javaee https:\/\/java.sun.com\/xml\/ns\/javaee\/web-app_3_0.xsd\" version=\"3.0\"&gt;\r\n  &lt;display-name&gt;ServletFileUploadDownloadExample&lt;\/display-name&gt;\r\n  &lt;welcome-file-list&gt;\r\n    &lt;welcome-file&gt;index.html&lt;\/welcome-file&gt;\r\n  &lt;\/welcome-file-list&gt;\r\n  &lt;context-param&gt;\r\n    &lt;param-name&gt;tempfile.dir&lt;\/param-name&gt;\r\n    &lt;param-value&gt;tmpfiles&lt;\/param-value&gt;\r\n  &lt;\/context-param&gt;\r\n&lt;\/web-app&gt;\r\n<\/code><\/pre>\n<h3>\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u5834\u6240\u306e\u305f\u3081\u306eServletContextListener<\/h3>\n<p>\u30d5\u30a1\u30a4\u30eb\u306e\u5834\u6240\u306e\u305f\u3081\u306b\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3093\u3067 File \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u521d\u671f\u5316\u6642\u306b\u305d\u308c\u3092\u884c\u3046\u305f\u3081\u306e ServletContextListener \u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u7d76\u5bfe\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u5834\u6240\u3068 File \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5c5e\u6027\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u3001\u4ed6\u306e\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4e0b\u8a18\u306f\u79c1\u305f\u3061\u306e ServletContextListener \u306e\u5b9f\u88c5\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.servlet;\r\n\r\nimport java.io.File;\r\n\r\nimport javax.servlet.ServletContext;\r\nimport javax.servlet.ServletContextEvent;\r\nimport javax.servlet.ServletContextListener;\r\nimport javax.servlet.annotation.WebListener;\r\n\r\n@WebListener\r\npublic class FileLocationContextListener implements ServletContextListener {\r\n\r\n    public void contextInitialized(ServletContextEvent servletContextEvent) {\r\n    \tString rootPath = System.getProperty(\"catalina.home\");\r\n    \tServletContext ctx = servletContextEvent.getServletContext();\r\n    \tString relativePath = ctx.getInitParameter(\"tempfile.dir\");\r\n    \tFile file = new File(rootPath + File.separator + relativePath);\r\n    \tif(!file.exists()) file.mkdirs();\r\n    \tSystem.out.println(\"File Directory created to be used for storing files\");\r\n    \tctx.setAttribute(\"FILES_DIR_FILE\", file);\r\n    \tctx.setAttribute(\"FILES_DIR\", rootPath + File.separator + relativePath);\r\n    }\r\n\r\n\tpublic void contextDestroyed(ServletContextEvent servletContextEvent) {\r\n\t\t\/\/do cleanup if needed\r\n\t}\r\n\t\r\n}\r\n<\/code><\/pre>\n<h2>\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3068\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u306e\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8<\/h2>\n<p>\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8: Servlet\u306e\u4ed5\u69d83\u3067\u306f\u3001API\u306b\u30b5\u30fc\u30d0\u30fc\u4e0a\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u30b5\u30dd\u30fc\u30c8\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u306e\u3067\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30fc\u306eAPI\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002Servlet 3\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u30d5\u30a1\u30a4\u30eb\u3092\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044\u3002\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u306b\u306f\u3001Apache Commons FileUpload\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u30d0\u30fc\u30b8\u30e7\u30f31.3\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002FileUpload\u306b\u306fApache Commons IO jar\u304c\u5fc5\u8981\u3067\u3059\u306e\u3067\u3001\u4e21\u65b9\u3092\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306elib\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u914d\u7f6e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u753b\u50cf\u306e\u4e0a\u306b\u793a\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u306b\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u69cb\u9020\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002HttpServletRequest\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30d1\u30fc\u30b9\u3057\u3066FileItem\u306e\u30ea\u30b9\u30c8\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3059\u308bDiskFileItemFactory\u30d5\u30a1\u30af\u30c8\u30ea\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002FileItem\u306b\u306f\u3001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u3001\u30d5\u30a9\u30fc\u30e0\u5185\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3001\u30b5\u30a4\u30ba\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u30bf\u30a4\u30d7\u306e\u8a73\u7d30\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u66f8\u304d\u8fbc\u3080\u305f\u3081\u306b\u306f\u3001File\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u305d\u308c\u3092FileItem\u306ewrite()\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3068\u3057\u3066\u6e21\u3059\u3060\u3051\u3067\u3059\u3002\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306e\u76ee\u7684\u306f\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u3067\u3059\u306e\u3067\u3001init()\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3001\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306eDiskFileItemFactory\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u521d\u671f\u5316\u3057\u307e\u3059\u3002\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092doPost()\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3067\u4f7f\u7528\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u30b5\u30fc\u30d0\u30fc\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3057\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u304c\u6210\u529f\u3057\u305f\u3089\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9URL\u3092\u542b\u3093\u3060\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002HTML\u306e\u30ea\u30f3\u30af\u306fGET\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u3001URL\u306b\u30d5\u30a1\u30a4\u30eb\u540d\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8ffd\u52a0\u3057\u3001\u540c\u3058\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306edoGet()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30d7\u30ed\u30bb\u30b9\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u307e\u305a\u30d5\u30a1\u30a4\u30eb\u306eInputStream\u3092\u958b\u304d\u3001ServletContext.getMimeType()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306eMIME\u30bf\u30a4\u30d7\u3092\u53d6\u5f97\u3057\u3001\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u30bf\u30a4\u30d7\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u9577\u3055\u3068\u3057\u3066\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u9577\u3055\u3092\u8a2d\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u306f\u3001&#8221;Content-Disposition&#8221;\u30d8\u30c3\u30c0\u30fc\u306e\u5024\u3092&#8221;attachment; filename=\u201cfileName\u201d&#8221;\u306b\u8a2d\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u8a2d\u5b9a\u304c\u5b8c\u4e86\u3057\u305f\u3089\u3001InputStream\u304b\u3089\u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8aad\u307f\u53d6\u308a\u3001ServletOutputStream\u306b\u66f8\u304d\u8fbc\u307f\u3001\u51fa\u529b\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u30d5\u30e9\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002\u6700\u7d42\u7684\u306aUploadDownloadFileServlet\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306e\u5b9f\u88c5\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.servlet;\r\n\r\nimport java.io.File;\r\nimport java.io.FileInputStream;\r\nimport java.io.IOException;\r\nimport java.io.InputStream;\r\nimport java.io.PrintWriter;\r\nimport java.util.Iterator;\r\nimport java.util.List;\r\n\r\nimport javax.servlet.ServletContext;\r\nimport javax.servlet.ServletException;\r\nimport javax.servlet.ServletOutputStream;\r\nimport javax.servlet.annotation.WebServlet;\r\nimport javax.servlet.http.HttpServlet;\r\nimport javax.servlet.http.HttpServletRequest;\r\nimport javax.servlet.http.HttpServletResponse;\r\n\r\nimport org.apache.commons.fileupload.FileItem;\r\nimport org.apache.commons.fileupload.FileUploadException;\r\nimport org.apache.commons.fileupload.disk.DiskFileItemFactory;\r\nimport org.apache.commons.fileupload.servlet.ServletFileUpload;\r\n\r\n@WebServlet(\"\/UploadDownloadFileServlet\")\r\npublic class UploadDownloadFileServlet extends HttpServlet {\r\n\tprivate static final long serialVersionUID = 1L;\r\n    private ServletFileUpload uploader = null;\r\n\t@Override\r\n\tpublic void init() throws ServletException{\r\n\t\tDiskFileItemFactory fileFactory = new DiskFileItemFactory();\r\n\t\tFile filesDir = (File) getServletContext().getAttribute(\"FILES_DIR_FILE\");\r\n\t\tfileFactory.setRepository(filesDir);\r\n\t\tthis.uploader = new ServletFileUpload(fileFactory);\r\n\t}\r\n\tprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n\t\tString fileName = request.getParameter(\"fileName\");\r\n\t\tif(fileName == null || fileName.equals(\"\")){\r\n\t\t\tthrow new ServletException(\"File Name can't be null or empty\");\r\n\t\t}\r\n\t\tFile file = new File(request.getServletContext().getAttribute(\"FILES_DIR\")+File.separator+fileName);\r\n\t\tif(!file.exists()){\r\n\t\t\tthrow new ServletException(\"File doesn't exists on server.\");\r\n\t\t}\r\n\t\tSystem.out.println(\"File location on server::\"+file.getAbsolutePath());\r\n\t\tServletContext ctx = getServletContext();\r\n\t\tInputStream fis = new FileInputStream(file);\r\n\t\tString mimeType = ctx.getMimeType(file.getAbsolutePath());\r\n\t\tresponse.setContentType(mimeType != null? mimeType:\"application\/octet-stream\");\r\n\t\tresponse.setContentLength((int) file.length());\r\n\t\tresponse.setHeader(\"Content-Disposition\", \"attachment; filename=\\\"\" + fileName + \"\\\"\");\r\n\t\t\r\n\t\tServletOutputStream os = response.getOutputStream();\r\n\t\tbyte[] bufferData = new byte[1024];\r\n\t\tint read=0;\r\n\t\twhile((read = fis.read(bufferData))!= -1){\r\n\t\t\tos.write(bufferData, 0, read);\r\n\t\t}\r\n\t\tos.flush();\r\n\t\tos.close();\r\n\t\tfis.close();\r\n\t\tSystem.out.println(\"File downloaded at client successfully\");\r\n\t}\r\n\r\n\tprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n\t\tif(!ServletFileUpload.isMultipartContent(request)){\r\n\t\t\tthrow new ServletException(\"Content type is not multipart\/form-data\");\r\n\t\t}\r\n\t\t\r\n\t\tresponse.setContentType(\"text\/html\");\r\n\t\tPrintWriter out = response.getWriter();\r\n\t\tout.write(\"&lt;html&gt;&lt;head&gt;&lt;\/head&gt;&lt;body&gt;\");\r\n\t\ttry {\r\n\t\t\tList&lt;FileItem&gt; fileItemsList = uploader.parseRequest(request);\r\n\t\t\tIterator&lt;FileItem&gt; fileItemsIterator = fileItemsList.iterator();\r\n\t\t\twhile(fileItemsIterator.hasNext()){\r\n\t\t\t\tFileItem fileItem = fileItemsIterator.next();\r\n\t\t\t\tSystem.out.println(\"FieldName=\"+fileItem.getFieldName());\r\n\t\t\t\tSystem.out.println(\"FileName=\"+fileItem.getName());\r\n\t\t\t\tSystem.out.println(\"ContentType=\"+fileItem.getContentType());\r\n\t\t\t\tSystem.out.println(\"Size in bytes=\"+fileItem.getSize());\r\n\t\t\t\t\r\n\t\t\t\tFile file = new File(request.getServletContext().getAttribute(\"FILES_DIR\")+File.separator+fileItem.getName());\r\n\t\t\t\tSystem.out.println(\"Absolute Path at server=\"+file.getAbsolutePath());\r\n\t\t\t\tfileItem.write(file);\r\n\t\t\t\tout.write(\"File \"+fileItem.getName()+ \" uploaded successfully.\");\r\n\t\t\t\tout.write(\"&lt;br&gt;\");\r\n\t\t\t\tout.write(\"&lt;a href=\\\"UploadDownloadFileServlet?fileName=\"+fileItem.getName()+\"\\\"&gt;Download \"+fileItem.getName()+\"&lt;\/a&gt;\");\r\n\t\t\t}\r\n\t\t} catch (FileUploadException e) {\r\n\t\t\tout.write(\"Exception in uploading file.\");\r\n\t\t} catch (Exception e) {\r\n\t\t\tout.write(\"Exception in uploading file.\");\r\n\t\t}\r\n\t\tout.write(\"&lt;\/body&gt;&lt;\/html&gt;\");\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30b5\u30f3\u30d7\u30eb\u5b9f\u884c\u306f\u4ee5\u4e0b\u306e\u753b\u50cf\u3067\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002 (Purojekuto no sanpuru jikk\u014d wa izanai no gaz\u014d de shimesareteimasu.)<\/p>\n<h3>\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u3002<\/h3>\n<p>\u4e0b\u8a18\u306eURL\u304b\u3089\u3001Apache Commons IO jar\u3068Apache Commons FileUpload jar\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 https:\/\/commons.apache.org\/proper\/commons-fileupload\/download_fileupload.cgi 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