{"id":578,"date":"2023-06-12T11:30:01","date_gmt":"2023-05-29T08:43:37","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/servlet-3-%e6%96%87%e4%bb%b6%e4%b8%8a%e4%bc%a0-multipartconfig-part\/"},"modified":"2025-08-02T19:57:39","modified_gmt":"2025-08-02T11:57:39","slug":"servlet-3-%e6%96%87%e4%bb%b6%e4%b8%8a%e4%bc%a0-multipartconfig-part","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/servlet-3-%e6%96%87%e4%bb%b6%e4%b8%8a%e4%bc%a0-multipartconfig-part\/","title":{"rendered":"Java Servlet 3\u6587\u4ef6\u4e0a\u4f20\u5b8c\u5168\u6307\u5357\uff1a@MultipartConfig\u6ce8\u89e3\u4e0ePart\u63a5\u53e3\u8be6\u89e3"},"content":{"rendered":"<p>\u4eca\u5929\u6211\u4eec\u5c06\u901a\u8fc7\u4f7f\u7528@MultipartConfig\u6ce8\u89e3\u548cjavax.servlet.http.Part\u6765\u67e5\u770bServlet 3\u6587\u4ef6\u4e0a\u4f20\u793a\u4f8b\u3002\u4e4b\u524d\u6211\u5199\u8fc7\u4e00\u7bc7\u5173\u4e8eServlet\u6587\u4ef6\u4e0a\u4f20\u7684\u6587\u7ae0\uff0c\u5f53\u65f6\u6211\u4f7f\u7528\u4e86Apache FileUpload API\uff0c\u4f46\u73b0\u5728\u6211\u4eec\u5c06\u4f7f\u7528Servlet 3\u6587\u4ef6\u4e0a\u4f20\u529f\u80fd\u3002<\/p>\n<h2>Servlet 3 \u6587\u4ef6\u4e0a\u4f20<\/h2>\n<p>\u7531\u4e8e\u6587\u4ef6\u4e0a\u4f20\u662fWeb\u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e38\u89c1\u7684\u4efb\u52a1\uff0cServlet\u89c4\u83033.0\u63d0\u4f9b\u4e86\u5bf9\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u7684\u989d\u5916\u652f\u6301\uff0c\u6211\u4eec\u4e0d\u9700\u8981\u4f9d\u8d56\u4e8e\u4efb\u4f55\u7b2c\u4e09\u65b9API\u3002\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u770b\u5230\u5982\u4f55\u4f7f\u7528Servlet 3.0 API\u5c06\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u3002<\/p>\n<h3>\u591a\u90e8\u5206\u914d\u7f6e<\/h3>\n<p>\u4e3a\u4e86\u5904\u7406\u7528\u4e8e\u5c06\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u7684multipart\/form-data\u8bf7\u6c42\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528MultipartConfig\u6ce8\u89e3\u6765\u6ce8\u89e3File Upload handler servlet\u3002MultipartConfig\u6ce8\u89e3\u5177\u6709\u4ee5\u4e0b\u5c5e\u6027\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>fileSizeThreshold: \u6211\u4eec\u53ef\u4ee5\u6307\u5b9a\u6587\u4ef6\u5c06\u88ab\u5199\u5165\u78c1\u76d8\u7684\u5927\u5c0f\u9608\u503c\u3002\u5927\u5c0f\u503c\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff0c\u6240\u4ee51024*1024*10\u7b49\u4e8e10MB\u3002<\/li>\n<li>location: \u6587\u4ef6\u9ed8\u8ba4\u5b58\u50a8\u7684\u76ee\u5f55\uff0c\u5176\u9ed8\u8ba4\u503c\u4e3a&#8221;&#8221;\u3002<\/li>\n<li>maxFileSize: \u5141\u8bb8\u4e0a\u4f20\u6587\u4ef6\u7684\u6700\u5927\u5927\u5c0f\uff0c\u5176\u503c\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u63d0\u4f9b\u3002\u9ed8\u8ba4\u503c\u4e3a-1L\uff0c\u8868\u793a\u65e0\u9650\u5236\u3002<\/li>\n<li>maxRequestSize: multipart\/form-data\u8bf7\u6c42\u5141\u8bb8\u7684\u6700\u5927\u5927\u5c0f\u3002\u9ed8\u8ba4\u503c\u4e3a-1L\uff0c\u8868\u793a\u65e0\u9650\u5236\u3002<\/li>\n<\/ul>\n<p>\u9605\u8bfb\u300aJava\u6ce8\u89e3\u6559\u7a0b\u300b\u4ee5\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u6ce8\u89e3\u7684\u5185\u5bb9\u3002<\/p>\n<h3>Part\u63a5\u53e3<\/h3>\n<p>Part\u63a5\u53e3\u8868\u793a\u5728multipart\/form-data POST\u8bf7\u6c42\u4e2d\u63a5\u6536\u5230\u7684\u4e00\u90e8\u5206\u6216\u8868\u5355\u9879\u3002\u4e00\u4e9b\u91cd\u8981\u7684\u65b9\u6cd5\u662fgetInputStream()\u548cwrite(String fileName)\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u6765\u8bfb\u53d6\u548c\u5199\u5165\u6587\u4ef6\u3002<\/p>\n<h3>HttpServletRequest \u7684\u6539\u53d8<\/h3>\n<p>HttpServletRequest\u4e2d\u6dfb\u52a0\u4e86\u65b0\u7684\u65b9\u6cd5getParts()\uff0c\u7528\u4e8e\u83b7\u53d6multipart\/form-data\u8bf7\u6c42\u4e2d\u7684\u6240\u6709\u90e8\u5206\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528getPart(String partName)\u65b9\u6cd5\u83b7\u53d6\u7279\u5b9a\u90e8\u5206\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u9879\u76ee\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u4e0a\u8ff0API\u65b9\u6cd5\u6765\u4f7f\u7528servlet\u4e0a\u4f20\u6587\u4ef6\u3002\u6211\u4eec\u7684\u9879\u76ee\u7ed3\u6784\u5c06\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n<h3>HTML\u8868\u5355<\/h3>\n<p>\u6211\u4eec\u6709\u4e00\u4e2a\u7b80\u5355\u7684HTML\u9875\u9762\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u5176\u4e2d\u9009\u62e9\u8981\u4e0a\u4f20\u7684\u6587\u4ef6\u5e76\u63d0\u4ea4\u8bf7\u6c42\u5230\u670d\u52a1\u5668\u4ee5\u5b8c\u6210\u4e0a\u4f20\u3002index.html<\/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=\"FileUploadServlet\" method=\"post\" enctype=\"multipart\/form-data\"&gt;\r\n\u9009\u62e9\u8981\u4e0a\u4f20\u7684\u6587\u4ef6:&lt;input type=\"file\" name=\"fileName\"&gt;\r\n&lt;br&gt;\r\n&lt;input type=\"submit\" value=\"\u4e0a\u4f20\"&gt;\r\n&lt;\/form&gt;\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;\r\n<\/code><\/pre>\n<h3>\u6587\u4ef6\u4e0a\u4f20Servlet<\/h3>\n<p>\u8fd9\u662f\u6211\u4eec\u7684\u6587\u4ef6\u4e0a\u4f20Servlet\u5b9e\u73b0\u3002FileUploadServlet.java<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.servlet;\r\n \r\nimport java.io.File;\r\nimport java.io.IOException;\r\n \r\nimport javax.servlet.ServletException;\r\nimport javax.servlet.annotation.MultipartConfig;\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\nimport javax.servlet.http.Part;\r\n \r\n@WebServlet(\"\/FileUploadServlet\")\r\n@MultipartConfig(fileSizeThreshold=1024*1024*10, \t\/\/ 10 MB \r\n                 maxFileSize=1024*1024*50,      \t\/\/ 50 MB\r\n                 maxRequestSize=1024*1024*100)   \t\/\/ 100 MB\r\npublic class FileUploadServlet extends HttpServlet {\r\n \r\n    private static final long serialVersionUID = 205242440643911308L;\r\n\t\r\n    \/**\r\n     * \u4e0a\u4f20\u6587\u4ef6\u5c06\u88ab\u4fdd\u5b58\u7684\u76ee\u5f55\uff0c\u5b83\u76f8\u5bf9\u4e8eWeb\u5e94\u7528\u7a0b\u5e8f\u76ee\u5f55\u3002\r\n     *\/\r\n    private static final String UPLOAD_DIR = \"uploads\";\r\n     \r\n    protected void doPost(HttpServletRequest request,\r\n            HttpServletResponse response) throws ServletException, IOException {\r\n        \/\/ \u83b7\u53d6Web\u5e94\u7528\u7a0b\u5e8f\u7684\u7edd\u5bf9\u8def\u5f84\r\n        String applicationPath = request.getServletContext().getRealPath(\"\");\r\n        \/\/ \u6784\u5efa\u4fdd\u5b58\u4e0a\u4f20\u6587\u4ef6\u7684\u76ee\u5f55\u8def\u5f84\r\n        String uploadFilePath = applicationPath + File.separator + UPLOAD_DIR;\r\n         \r\n        \/\/ \u5982\u679c\u4fdd\u5b58\u76ee\u5f55\u4e0d\u5b58\u5728\u5219\u521b\u5efa\u5b83\r\n        File fileSaveDir = new File(uploadFilePath);\r\n        if (!fileSaveDir.exists()) {\r\n            fileSaveDir.mkdirs();\r\n        }\r\n        System.out.println(\"\u4e0a\u4f20\u6587\u4ef6\u76ee\u5f55=\"+fileSaveDir.getAbsolutePath());\r\n        \r\n        String fileName = null;\r\n        \/\/ \u4ece\u8bf7\u6c42\u4e2d\u83b7\u53d6\u6240\u6709\u90e8\u5206\u5e76\u5c06\u5176\u5199\u5165\u670d\u52a1\u5668\u4e0a\u7684\u6587\u4ef6\r\n        for (Part part : request.getParts()) {\r\n            fileName = getFileName(part);\r\n            part.write(uploadFilePath + File.separator + fileName);\r\n        }\r\n \r\n        request.setAttribute(\"message\", fileName + \" \u6587\u4ef6\u4e0a\u4f20\u6210\u529f\uff01\");\r\n        getServletContext().getRequestDispatcher(\"\/response.jsp\").forward(\r\n                request, response);\r\n    }\r\n \r\n    \/**\r\n     * \u4eceHTTP\u5934content-disposition\u83b7\u53d6\u6587\u4ef6\u540d\u7684\u5de5\u5177\u65b9\u6cd5\r\n     *\/\r\n    private String getFileName(Part part) {\r\n        String contentDisp = part.getHeader(\"content-disposition\");\r\n        System.out.println(\"content-disposition\u5934= \"+contentDisp);\r\n        String[] tokens = contentDisp.split(\";\");\r\n        for (String token : tokens) {\r\n            if (token.trim().startsWith(\"filename\")) {\r\n                return token.substring(token.indexOf(\"=\") + 2, token.length()-1);\r\n            }\r\n        }\r\n        return \"\";\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\u4f7f\u7528@MultipartConfig\u6ce8\u91ca\u6765\u4e3a\u4e0a\u4f20\u6587\u4ef6\u6307\u5b9a\u4e0d\u540c\u7684\u5927\u5c0f\u53c2\u6570\u3002\u6211\u4eec\u9700\u8981\u4f7f\u7528\u8bf7\u6c42\u5934\u4e2d\u7684&#8221;content-disposition&#8221;\u5c5e\u6027\u6765\u83b7\u53d6\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6587\u4ef6\u540d\uff0c\u5e76\u5c06\u6587\u4ef6\u4fdd\u5b58\u4e3a\u76f8\u540c\u7684\u540d\u79f0\u3002\u4fdd\u5b58\u6587\u4ef6\u7684\u76ee\u5f55\u4f4d\u7f6e\u662f\u76f8\u5bf9\u4e8e\u6211\u6b63\u5728\u4fdd\u5b58\u6587\u4ef6\u7684Web\u5e94\u7528\u7a0b\u5e8f\u7684\u4f4d\u7f6e\uff0c\u60a8\u53ef\u4ee5\u5c06\u5176\u914d\u7f6e\u4e3a\u5176\u4ed6\u4f4d\u7f6e\uff0c\u5c31\u50cf\u5728Apache Commons FileUpload\u793a\u4f8b\u4e2d\u90a3\u6837\u3002<\/p>\n<h3>JSP\u54cd\u5e94<\/h3>\n<p>\u4e00\u4e2a\u7b80\u5355\u7684JSP\u9875\u9762\uff0c\u4e00\u65e6\u6587\u4ef6\u6210\u529f\u4e0a\u4f20\u5230\u670d\u52a1\u5668\uff0c\u5c31\u4f1a\u4f5c\u4e3a\u54cd\u5e94\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u3002\u8fd9\u4e2a\u9875\u9762\u540d\u4e3aresponse.jsp\u3002<\/p>\n<pre class=\"post-pre\"><code>&lt;%@ page language=\"java\" contentType=\"text\/html; charset=ISO-8859-1\"\r\n    pageEncoding=\"ISO-8859-1\"%&gt;\r\n&lt;!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.01 Transitional\/\/EN\" \r\n    \"https:\/\/www.w3.org\/TR\/html4\/loose.dtd\"&gt;\r\n&lt;html&gt;\r\n&lt;head&gt;\r\n&lt;title&gt;\u6587\u4ef6\u4e0a\u4f20\u54cd\u5e94&lt;\/title&gt;\r\n&lt;\/head&gt;\r\n&lt;body&gt;\r\n\t&lt;%-- \u4f7f\u7528JSP EL\u4ece\u8bf7\u6c42\u8303\u56f4\u83b7\u53d6message\u5c5e\u6027\u503c --%&gt;\r\n    &lt;h2&gt;${requestScope.message}&lt;\/h2&gt;\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;\r\n<\/code><\/pre>\n<h3>\u90e8\u7f72\u63cf\u8ff0\u7b26<\/h3>\n<p>\u5728web.xml\u6587\u4ef6\u4e2d\uff0c\u6ca1\u6709\u5173\u4e8eservlet\u6587\u4ef6\u4e0a\u4f20\u7684\u65b0\u5185\u5bb9\uff0c\u5b83\u4ec5\u7528\u4e8e\u5c06index.html\u6587\u4ef6\u8bbe\u7f6e\u4e3a\u6b22\u8fce\u6587\u4ef6\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;ServletFileUploadExample&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;\/web-app&gt;\r\n<\/code><\/pre>\n<p>\u73b0\u5728\u5f53\u6211\u4eec\u8fd0\u884c\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u4ee5\u4e0b\u9875\u9762\u4f5c\u4e3a\u54cd\u5e94\u3002\u65e5\u5fd7\u5c06\u663e\u793a\u6587\u4ef6\u4fdd\u5b58\u7684\u76ee\u5f55\u4f4d\u7f6e\u548ccontent-disposition\u5934\u4fe1\u606f\u3002<\/p>\n<pre class=\"post-pre\"><code>\u4e0a\u4f20\u6587\u4ef6\u76ee\u5f55=\/Users\/scdev\/Documents\/workspace\/j2ee\/.metadata\/.plugins\/org.eclipse.wst.server.core\/tmp0\/wtpwebapps\/ServletFileUploadExample\/uploads\r\ncontent-disposition\u5934= form-data; name=\"fileName\"; filename=\"IMG_2046.jpg\"\r\n<\/code><\/pre>\n<p>\u6211\u901a\u8fc7Eclipse\u8fd0\u884cTomcat\uff0c\u6240\u4ee5\u6587\u4ef6\u4f4d\u7f6e\u662f\u8fd9\u6837\u7684\u3002\u5982\u679c\u4f60\u901a\u8fc7\u547d\u4ee4\u884c\u8fd0\u884ctomcat\uff0c\u5e76\u5c06\u5e94\u7528\u7a0b\u5e8f\u5bfc\u51fa\u4e3aWAR\u6587\u4ef6\u90e8\u7f72\u5230webapps\u76ee\u5f55\u4e2d\uff0c\u4f60\u4f1a\u5f97\u5230\u4e00\u4e2a\u4e0d\u540c\u4f46\u662f\u6e05\u6670\u7684\u7ed3\u6784\u3002<\/p>\n<p>\u4e0b\u8f7dServlet 3 Multipart\u6587\u4ef6\u4e0a\u4f20\u9879\u76ee<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929\u6211\u4eec\u5c06\u901a\u8fc7\u4f7f\u7528@MultipartConfig\u6ce8\u89e3\u548cjavax.servlet.http.Part\u6765\u67e5\u770bS 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