{"id":325,"date":"2023-09-29T21:25:00","date_gmt":"2024-02-10T14:40:20","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/servlet%e4%b8%8a%e4%bc%a0%e6%96%87%e4%bb%b6%e5%92%8c%e4%b8%8b%e8%bd%bd%e6%96%87%e4%bb%b6%e7%9a%84%e7%a4%ba%e4%be%8b\/"},"modified":"2025-08-01T22:32:22","modified_gmt":"2025-08-01T14:32:22","slug":"servlet%e4%b8%8a%e4%bc%a0%e6%96%87%e4%bb%b6%e5%92%8c%e4%b8%8b%e8%bd%bd%e6%96%87%e4%bb%b6%e7%9a%84%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/servlet%e4%b8%8a%e4%bc%a0%e6%96%87%e4%bb%b6%e5%92%8c%e4%b8%8b%e8%bd%bd%e6%96%87%e4%bb%b6%e7%9a%84%e7%a4%ba%e4%be%8b\/","title":{"rendered":"Java Servlet\u6587\u4ef6\u4e0a\u4f20\u4e0b\u8f7d\u5b8c\u6574\u6559\u7a0b\uff1a\u9644\u5b9e\u4f8b\u4ee3\u7801"},"content":{"rendered":"<p>\u5728Java Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u901a\u8fc7Servlet\u4e0a\u4f20\u6587\u4ef6\u548c\u4e0b\u8f7d\u6587\u4ef6\u662f\u4e00\u9879\u5e38\u89c1\u4efb\u52a1\u3002\u7531\u4e8e\u6700\u8fd1\u6211\u5199\u4e86\u5f88\u591a\u5173\u4e8eJava Servlet\u7684\u5185\u5bb9\uff0c\u6211\u60f3\u63d0\u4f9b\u4e00\u4e2a\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u901a\u8fc7Servlet\u5c06\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668\uff0c\u7136\u540e\u4ece\u670d\u52a1\u5668\u4e0b\u8f7d\u5230\u5ba2\u6237\u7aef\u3002<\/p>\n<h2>Servlet\u4e0a\u4f20\u6587\u4ef6<\/h2>\n<p>\u6211\u4eec\u7684\u4f7f\u7528\u6848\u4f8b\u662f\u63d0\u4f9b\u4e00\u4e2a\u7b80\u5355\u7684HTML\u9875\u9762\uff0c\u5ba2\u6237\u7aef\u53ef\u4ee5\u5728\u9875\u9762\u4e0a\u9009\u62e9\u672c\u5730\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u3002\u5f53\u7528\u6237\u63d0\u4ea4\u4e0a\u4f20\u6587\u4ef6\u7684\u8bf7\u6c42\u65f6\uff0c\u6211\u4eec\u7684Servlet\u7a0b\u5e8f\u5c06\u628a\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u7684\u4e00\u4e2a\u76ee\u5f55\u4e2d\uff0c\u5e76\u63d0\u4f9b\u4e0b\u8f7d\u6587\u4ef6\u7684URL\u4f9b\u7528\u6237\u4f7f\u7528\u3002\u51fa\u4e8e\u5b89\u5168\u539f\u56e0\uff0c\u7528\u6237\u5c06\u4e0d\u4f1a\u76f4\u63a5\u83b7\u5f97\u4e0b\u8f7d\u6587\u4ef6\u7684URL\uff0c\u800c\u662f\u4f1a\u83b7\u5f97\u4e00\u4e2a\u4e0b\u8f7d\u6587\u4ef6\u7684\u94fe\u63a5\uff0c\u6211\u4eec\u7684Servlet\u7a0b\u5e8f\u5c06\u5904\u7406\u8be5\u8bf7\u6c42\u5e76\u5c06\u6587\u4ef6\u53d1\u9001\u7ed9\u7528\u6237\u3002\u6211\u4eec\u5c06\u5728Eclipse\u4e2d\u521b\u5efa\u4e00\u4e2a\u52a8\u6001Web\u9879\u76ee\uff0c\u9879\u76ee\u7ed3\u6784\u5982\u4e0b\u56fe\u6240\u793a\u3002\u8ba9\u6211\u4eec\u4e00\u8d77\u4e86\u89e3\u6211\u4eec\u7684Web\u5e94\u7528\u7a0b\u5e8f\u7684\u6240\u6709\u7ec4\u4ef6\uff0c\u5e76\u7406\u89e3\u5176\u5b9e\u73b0\u65b9\u5f0f\u3002<\/p>\n<h3>Java\u4e0a\u4f20\u6587\u4ef6\u5230\u670d\u52a1\u5668\u7684HTML\u9875\u9762<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5411\u670d\u52a1\u5668\u53d1\u9001POST\u8bf7\u6c42\u548c\u63d0\u4ea4\u8868\u5355\u6765\u4e0a\u4f20\u6587\u4ef6\u3002\u6211\u4eec\u4e0d\u80fd\u4f7f\u7528GET\u65b9\u6cd5\u6765\u4e0a\u4f20\u6587\u4ef6\u3002\u53e6\u4e00\u4e2a\u8981\u6ce8\u610f\u7684\u70b9\u662f\u8868\u5355\u7684enctype\u5e94\u8be5\u662fmultipart\/form-data\u3002\u4e3a\u4e86\u4ece\u7528\u6237\u7684\u6587\u4ef6\u7cfb\u7edf\u4e2d\u9009\u62e9\u6587\u4ef6\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528type\u4e3afile\u7684input\u5143\u7d20\u3002\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u6709\u4e00\u4e2a\u7b80\u5355\u7684HTML\u9875\u9762index.html\u6765\u4e0a\u4f20\u6587\u4ef6\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\n\u9009\u62e9\u8981\u4e0a\u4f20\u7684\u6587\u4ef6\uff1a&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\u4f20\u7684\u670d\u52a1\u5668\u6587\u4ef6\u4f4d\u7f6e<\/h3>\n<p>\u6211\u4eec\u9700\u8981\u5c06\u6587\u4ef6\u5b58\u50a8\u5230\u670d\u52a1\u5668\u7684\u67d0\u4e2a\u76ee\u5f55\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u786c\u7f16\u7801\u8fd9\u4e2a\u76ee\u5f55\uff0c\u4f46\u4e3a\u4e86\u66f4\u597d\u7684\u7075\u6d3b\u6027\uff0c\u6211\u4eec\u5c06\u5728\u90e8\u7f72\u63cf\u8ff0\u7b26\u4e0a\u4e0b\u6587\u53c2\u6570\u4e2d\u5c06\u5176\u914d\u7f6e\u4e3a\u53ef\u914d\u7f6e\u3002\u6b64\u5916\uff0c\u6211\u4eec\u5c06\u628a\u6211\u4eec\u7684\u4e0a\u4f20\u6587\u4ef6\u7684HTML\u9875\u9762\u6dfb\u52a0\u5230\u6b22\u8fce\u6587\u4ef6\u5217\u8868\u4e2d\u3002\u6211\u4eec\u7684web.xml\u6587\u4ef6\u5c06\u5982\u4e0b\u6240\u793a\uff1a<\/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;Servlet\u6587\u4ef6\u4e0a\u4f20\u4e0b\u8f7d\u793a\u4f8b&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>\u6587\u4ef6\u4e0a\u4f20\u4f4d\u7f6e\u7684ServletContextListener<\/h3>\n<p>\u7531\u4e8e\u6211\u4eec\u9700\u8981\u8bfb\u53d6\u6587\u4ef6\u4f4d\u7f6e\u7684\u4e0a\u4e0b\u6587\u53c2\u6570\u5e76\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5bf9\u8c61\uff0c\u6240\u4ee5\u5f53\u4e0a\u4e0b\u6587\u88ab\u521d\u59cb\u5316\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4e00\u4e2aServletContextListener\u6765\u5b8c\u6210\u8fd9\u4e2a\u4efb\u52a1\u3002\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u7edd\u5bf9\u76ee\u5f55\u4f4d\u7f6e\u548c\u6587\u4ef6\u5bf9\u8c61\u4f5c\u4e3a\u4e0a\u4e0b\u6587\u5c5e\u6027\uff0c\u4ee5\u4f9b\u5176\u4ed6Servlet\u4f7f\u7528\u3002\u6211\u4eec\u7684ServletContextListener\u5b9e\u73b0\u4ee3\u7801\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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(\"\u5df2\u521b\u5efa\u7528\u4e8e\u5b58\u50a8\u6587\u4ef6\u7684\u76ee\u5f55\");\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\/\/ \u5982\u679c\u9700\u8981\uff0c\u6267\u884c\u6e05\u7406\u64cd\u4f5c\r\n\t}\r\n\t\r\n}\r\n<\/code><\/pre>\n<h2>\u6587\u4ef6\u4e0a\u4f20\u4e0b\u8f7dServlet<\/h2>\n<p>\u66f4\u65b0\uff1aServlet 3\u89c4\u8303\u5728API\u4e2d\u6dfb\u52a0\u4e86\u5bf9\u670d\u52a1\u5668\u7aef\u6587\u4ef6\u4e0a\u4f20\u7684\u652f\u6301\uff0c\u56e0\u6b64\u6211\u4eec\u4e0d\u9700\u8981\u4f7f\u7528\u4efb\u4f55\u7b2c\u4e09\u65b9API\u3002\u8be6\u60c5\u8bf7\u67e5\u770bServlet 3\u6587\u4ef6\u4e0a\u4f20\u529f\u80fd\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u4f7f\u7528Apache Commons FileUpload\u5de5\u5177\u6765\u5b9e\u73b0\u6587\u4ef6\u4e0a\u4f20\u529f\u80fd\uff0c\u9879\u76ee\u4f7f\u7528\u7684\u662f1.3\u7248\u672c\u3002FileUpload\u4f9d\u8d56\u4e8eApache Commons IO jar\u5305\uff0c\u56e0\u6b64\u6211\u4eec\u9700\u8981\u5c06\u8fd9\u4e24\u4e2ajar\u5305\u90fd\u653e\u7f6e\u5728\u9879\u76ee\u7684lib\u76ee\u5f55\u4e2d\uff0c\u5982\u4e0a\u6587\u9879\u76ee\u7ed3\u6784\u56fe\u6240\u793a\u3002\u6211\u4eec\u5c06\u4f7f\u7528DiskFileItemFactory\u5de5\u5382\u7c7b\uff0c\u5b83\u63d0\u4f9b\u4e86\u89e3\u6790HttpServletRequest\u5bf9\u8c61\u5e76\u8fd4\u56deFileItem\u5217\u8868\u7684\u65b9\u6cd5\u3002FileItem\u7c7b\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5b9e\u7528\u65b9\u6cd5\uff0c\u7528\u4e8e\u83b7\u53d6\u4e0a\u4f20\u6587\u4ef6\u7684\u6587\u4ef6\u540d\u3001\u8868\u5355\u5b57\u6bb5\u540d\u3001\u6587\u4ef6\u5927\u5c0f\u548c\u5185\u5bb9\u7c7b\u578b\u7b49\u8be6\u7ec6\u4fe1\u606f\u3002\u8981\u5c06\u6587\u4ef6\u5199\u5165\u6307\u5b9a\u76ee\u5f55\uff0c\u6211\u4eec\u53ea\u9700\u521b\u5efa\u4e00\u4e2aFile\u5bf9\u8c61\u5e76\u5c06\u5176\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9FileItem\u7684write()\u65b9\u6cd5\u5373\u53ef\u3002\u7531\u4e8e\u8be5Servlet\u7684\u4e3b\u8981\u529f\u80fd\u662f\u4e0a\u4f20\u6587\u4ef6\uff0c\u6211\u4eec\u5c06\u91cd\u5199init()\u65b9\u6cd5\u6765\u521d\u59cb\u5316DiskFileItemFactory\u5bf9\u8c61\u5b9e\u4f8b\u3002\u6211\u4eec\u5c06\u5728doPost()\u65b9\u6cd5\u5b9e\u73b0\u4e2d\u4f7f\u7528\u6b64\u5bf9\u8c61\u5c06\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u76ee\u5f55\u3002\u6587\u4ef6\u6210\u529f\u4e0a\u4f20\u540e\uff0c\u6211\u4eec\u5c06\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u5305\u542b\u4e0b\u8f7d\u6587\u4ef6URL\u7684\u54cd\u5e94\u3002\u7531\u4e8eHTML\u94fe\u63a5\u4f7f\u7528GET\u65b9\u6cd5\uff0c\u6211\u4eec\u5c06\u5728URL\u4e2d\u6dfb\u52a0\u6587\u4ef6\u540d\u53c2\u6570\uff0c\u5e76\u5229\u7528\u540c\u4e00\u4e2aServlet\u7684doGet()\u65b9\u6cd5\u6765\u5b9e\u73b0\u6587\u4ef6\u4e0b\u8f7d\u529f\u80fd\u3002\u4e3a\u4e86\u5b9e\u73b0\u6587\u4ef6\u4e0b\u8f7dServlet\uff0c\u9996\u5148\u6211\u4eec\u5c06\u6253\u5f00\u6587\u4ef6\u7684InputStream\uff0c\u5e76\u4f7f\u7528ServletContext.getMimeType()\u65b9\u6cd5\u83b7\u53d6\u6587\u4ef6\u7684MIME\u7c7b\u578b\uff0c\u5e76\u5c06\u5176\u8bbe\u7f6e\u4e3a\u54cd\u5e94\u7684\u5185\u5bb9\u7c7b\u578b\u3002\u6211\u4eec\u8fd8\u9700\u8981\u5c06\u54cd\u5e94\u7684\u5185\u5bb9\u957f\u5ea6\u8bbe\u7f6e\u4e3a\u6587\u4ef6\u7684\u5b9e\u9645\u957f\u5ea6\u3002\u4e3a\u786e\u4fdd\u5ba2\u6237\u7aef\u6b63\u786e\u8bc6\u522b\u6211\u4eec\u53d1\u9001\u7684\u662f\u6587\u4ef6\u54cd\u5e94\uff0c\u6211\u4eec\u9700\u8981\u8bbe\u7f6e&quot;Content-Disposition&quot;\u54cd\u5e94\u5934\uff0c\u5176\u503c\u4e3a&quot;attachment; filename=&quot;\u6587\u4ef6\u540d&quot;&quot;\u3002\u5b8c\u6210\u54cd\u5e94\u914d\u7f6e\u8bbe\u7f6e\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4eceInputStream\u4e2d\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\uff0c\u5c06\u5176\u5199\u5165ServletOutputStream\uff0c\u7136\u540e\u5c06\u8f93\u51fa\u6d41\u5237\u65b0\u5230\u5ba2\u6237\u7aef\u3002\u6211\u4eec\u7684\u6700\u7ec8\u5b9e\u73b0UploadDownloadFileServlet Servlet\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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(&quot;\/UploadDownloadFileServlet&quot;)\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(&quot;FILES_DIR_FILE&quot;);\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(&quot;fileName&quot;);\r\n\t\tif(fileName == null || fileName.equals(&quot;&quot;)){\r\n\t\t\tthrow new ServletException(&quot;\u6587\u4ef6\u540d\u4e0d\u80fd\u4e3a\u7a7a&quot;);\r\n\t\t}\r\n\t\tFile file = new File(request.getServletContext().getAttribute(&quot;FILES_DIR&quot;)+File.separator+fileName);\r\n\t\tif(!file.exists()){\r\n\t\t\tthrow new ServletException(&quot;\u670d\u52a1\u5668\u4e0a\u4e0d\u5b58\u5728\u8be5\u6587\u4ef6&quot;);\r\n\t\t}\r\n\t\tSystem.out.println(&quot;\u670d\u52a1\u5668\u4e0a\u7684\u6587\u4ef6\u4f4d\u7f6e::&quot;+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:&quot;application\/octet-stream&quot;);\r\n\t\tresponse.setContentLength((int) file.length());\r\n\t\tresponse.setHeader(&quot;Content-Disposition&quot;, &quot;attachment; filename=&quot;&quot; + fileName + &quot;&quot;&quot;);\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(&quot;\u6587\u4ef6\u5df2\u6210\u529f\u4e0b\u8f7d\u5230\u5ba2\u6237\u7aef&quot;);\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(&quot;\u5185\u5bb9\u7c7b\u578b\u4e0d\u662fmultipart\/form-data&quot;);\r\n\t\t}\r\n\t\t\r\n\t\tresponse.setContentType(&quot;text\/html&quot;);\r\n\t\tPrintWriter out = response.getWriter();\r\n\t\tout.write(&quot;&lt;html&gt;&lt;head&gt;&lt;\/head&gt;&lt;body&gt;&quot;);\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(&quot;\u5b57\u6bb5\u540d=&quot;+fileItem.getFieldName());\r\n\t\t\t\tSystem.out.println(&quot;\u6587\u4ef6\u540d=&quot;+fileItem.getName());\r\n\t\t\t\tSystem.out.println(&quot;\u5185\u5bb9\u7c7b\u578b=&quot;+fileItem.getContentType());\r\n\t\t\t\tSystem.out.println(&quot;\u5b57\u8282\u5927\u5c0f=&quot;+fileItem.getSize());\r\n\t\t\t\t\r\n\t\t\t\tFile file = new File(request.getServletContext().getAttribute(&quot;FILES_DIR&quot;)+File.separator+fileItem.getName());\r\n\t\t\t\tSystem.out.println(&quot;\u670d\u52a1\u5668\u4e0a\u7684\u7edd\u5bf9\u8def\u5f84=&quot;+file.getAbsolutePath());\r\n\t\t\t\tfileItem.write(file);\r\n\t\t\t\tout.write(&quot;\u6587\u4ef6 &quot;+fileItem.getName()+ &quot; \u4e0a\u4f20\u6210\u529f\u3002&quot;);\r\n\t\t\t\tout.write(&quot;&lt;br&gt;&quot;);\r\n\t\t\t\tout.write(&quot;&lt;a href=\\&quot;UploadDownloadFileServlet?fileName=&quot;+fileItem.getName()+&quot;\\&quot;&gt;\u4e0b\u8f7d &quot;+fileItem.getName()+&quot;&lt;\/a&gt;&quot;);\r\n\t\t\t}\r\n\t\t} catch (FileUploadException e) {\r\n\t\t\tout.write(&quot;\u6587\u4ef6\u4e0a\u4f20\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u5f02\u5e38\u3002&quot;);\r\n\t\t} catch (Exception e) {\r\n\t\t\tout.write(&quot;\u6587\u4ef6\u4e0a\u4f20\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u5f02\u5e38\u3002&quot;);\r\n\t\t}\r\n\t\tout.write(&quot;&lt;\/body&gt;&lt;\/html&gt;&quot;);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u8be5\u9879\u76ee\u7684\u793a\u4f8b\u6267\u884c\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n<h3>\u4e0b\u8f7dServlet\u6587\u4ef6\u4e0a\u4f20\u4e0b\u8f7d\u9879\u76ee<\/h3>\n<h3>Servlet\u4e0a\u4f20\u6587\u4ef6\u548c\u4e0b\u8f7d\u6587\u4ef6\u7684\u793a\u4f8b &#8211; \u7b2c3\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09<\/h3>\n<p>\u60a8\u53ef\u4ee5\u4ece\u4ee5\u4e0b\u7f51\u5740\u4e0b\u8f7dApache Commons IO jar\u5305\u548cApache Commons FileUpload jar\u5305\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/commons.apache.org\/proper\/commons-fileupload\/download_fileupload.cgi\" target=\"_blank\">Apache Commons FileUpload \u4e0b\u8f7d\u9875\u9762<\/a><\/li>\n<li><a href=\"https:\/\/commons.apache.org\/proper\/commons-io\/download_io.cgi\" target=\"_blank\">Apache Commons IO \u4e0b\u8f7d\u9875\u9762<\/a><\/li>\n<\/ul>\n<h4>\u4e0b\u8f7dServlet\u6587\u4ef6\u4e0a\u4f20\u4e0b\u8f7d\u793a\u4f8b\u9879\u76ee<\/h4>\n<p>\u8bf7\u67e5\u770b\u5173\u4e8eServlet\u5f02\u5e38\u5904\u7406\u7684\u7cfb\u5217\u6587\u7ae0\u4e2d\u7684\u4e0b\u4e00\u7bc7\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u901a\u8fc7Servlet\u4e0a\u4f20\u6587\u4ef6\u548c\u4e0b\u8f7d\u6587\u4ef6\u662f\u4e00\u9879\u5e38\u89c1\u4efb\u52a1\u3002\u7531\u4e8e\u6700\u8fd1\u6211\u5199\u4e86\u5f88\u591a\u5173\u4e8eJav [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1108,180,323,1109,1110],"class_list":["post-325","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java-servlet","tag-java","tag-web","tag-1109","tag-1110"],"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 Servlet\u6587\u4ef6\u4e0a\u4f20\u4e0b\u8f7d\u5b8c\u6574\u6559\u7a0b\uff1a\u9644\u5b9e\u4f8b\u4ee3\u7801 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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