{"id":555,"date":"2023-01-16T17:16:19","date_gmt":"2023-01-16T09:16:19","guid":{"rendered":"https:\/\/scutvk.cn\/?p=555"},"modified":"2023-01-16T17:20:44","modified_gmt":"2023-01-16T09:20:44","slug":"%e4%bd%bf%e7%94%a8-jsp-servlet-%e5%b0%86%e6%96%87%e4%bb%b6%e4%b8%8a%e8%bd%bd%e5%88%b0%e6%9c%8d%e5%8a%a1%e5%99%a8-2023","status":"publish","type":"post","link":"https:\/\/scutvk.cn\/?p=555","title":{"rendered":"\u4f7f\u7528 JSP\/Servlet \u5c06\u6587\u4ef6\u4e0a\u8f7d\u5230\u670d\u52a1\u5668 2023"},"content":{"rendered":"\n<p class=\"has-large-font-size\"><strong>\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n<p>\u8981\u6d4f\u89c8\u5e76\u9009\u62e9\u8981\u4e0a\u4f20\u7684\u6587\u4ef6\uff0c\u60a8\u9700\u8981\u8868\u5355\u4e2d\u7684 HTML \u5b57\u6bb5\u3002\u5982&nbsp;<a href=\"http:\/\/www.w3.org\/TR\/html4\/interact\/forms.html\" target=\"_blank\" rel=\"noopener\">HTML \u89c4\u8303<\/a>\u4e2d\u6240\u8ff0\uff0c\u60a8\u5fc5\u987b\u4f7f\u7528\u8be5\u65b9\u6cd5\uff0c\u5e76\u4e14\u8868\u5355\u7684\u5c5e\u6027\u5fc5\u987b\u8bbe\u7f6e\u4e3a<code> &lt;input type=\"file\"&gt;POSTenctype\"multipart\/form-data\"<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"markup\" class=\"language-markup line-numbers\">&lt;form action=\"upload\" method=\"post\" enctype=\"multipart\/form-data\"&gt;\n    &lt;input type=\"text\" name=\"description\" \/&gt;\n    &lt;input type=\"file\" name=\"file\" \/&gt;\n    &lt;input type=\"submit\" \/&gt;\n&lt;\/form&gt;<\/code><\/pre>\n\n\n\n<p>\u63d0\u4ea4\u6b64\u7c7b\u8868\u5355\u540e\uff0c\u4e8c\u8fdb\u5236\u591a\u90e8\u5206\u8868\u5355\u6570\u636e\u5728\u8bf7\u6c42\u6b63\u6587\u4e2d\u7684\u53ef\u7528\u683c\u5f0f\u4e0e\u672a\u8bbe\u7f6e\u65f6<a href=\"https:\/\/stackoverflow.com\/questions\/13372775\/servlet-handling-file-upload-why-bigger-than-the-original\/13399437#13399437\" target=\"_blank\" rel=\"noopener\">\u4e0d\u540c<\/a>\u3002<\/p>\n\n\n\n<p>\u5728 Servlet 3.0\uff082009 \u5e74 12 \u6708\uff09\u4e4b\u524d\uff0cServlet API \u672c\u8eab\u5e76\u4e0d\u652f\u6301 \u3002\u5b83\u4ec5\u652f\u6301\u9ed8\u8ba4\u8868\u5355 \u7684 enctype \u3002\u5f53\u4f7f\u7528\u591a\u90e8\u5206\u8868\u5355\u6570\u636e\u65f6\uff0c\u6240\u6709\u7684\u548c\u5bf9\u5e94\u7684\u90fd\u4f1a\u8fd4\u56de\u3002\u8fd9\u5c31\u662f\u8457\u540d\u7684<a href=\"http:\/\/commons.apache.org\/fileupload\" target=\"_blank\" rel=\"noopener\">Apache Commons FileUpload<\/a>\u51fa\u73b0\u7684\u5730\u65b9\u3002 <code>multipart\/form-dataapplication\/x-www-form-urlencodedrequest.getParameter()null<\/code><\/p>\n\n\n\n<p class=\"has-large-font-size\"><strong>\u4e0d\u8981\u624b\u52a8\u89e3\u6790\u5b83\uff01<\/strong><\/p>\n\n\n\n<p>\u7406\u8bba\u4e0a\uff0c\u60a8\u53ef\u4ee5\u57fa\u4e8e&nbsp;<a href=\"http:\/\/docs.oracle.com\/javaee\/6\/api\/javax\/servlet\/ServletRequest.html#getInputStream%28%29\" target=\"_blank\" rel=\"noopener\"><code>ServletRequest#getInputStream\uff08\uff09<\/code><\/a>&nbsp;\u81ea\u5df1\u89e3\u6790\u8bf7\u6c42\u6b63\u6587\u3002\u7136\u800c\uff0c\u8fd9\u662f\u4e00\u9879\u7cbe\u786e\u800c\u7e41\u7410\u7684\u5de5\u4f5c\uff0c\u9700\u8981\u5bf9&nbsp;<a href=\"http:\/\/www.faqs.org\/rfcs\/rfc2388.html\" target=\"_blank\" rel=\"noopener\">RFC2388<\/a>&nbsp;\u6709\u7cbe\u786e\u7684\u4e86\u89e3\u3002\u60a8\u4e0d\u5e94\u8be5\u5c1d\u8bd5\u81ea\u5df1\u6267\u884c\u6b64\u64cd\u4f5c\u6216\u590d\u5236\u7c98\u8d34\u4e00\u4e9b\u5728\u4e92\u8054\u7f51\u4e0a\u5176\u4ed6\u5730\u65b9\u627e\u5230\u7684\u672c\u5730\u65e0\u5e93\u4ee3\u7801\u3002\u8bb8\u591a\u5728\u7ebf\u8d44\u6e90\u5728\u8fd9\u65b9\u9762\u90fd\u5931\u8d25\u4e86\uff0c\u4f8b\u5982 roseindia.net\u3002\u53e6\u8bf7\u53c2\u9605<a href=\"https:\/\/stackoverflow.com\/questions\/5038798\/uploading-of-pdf-file\" target=\"_blank\" rel=\"noopener\">\u4e0a\u4f20 pdf \u6587\u4ef6<\/a>\u3002\u4f60\u5e94\u8be5\u4f7f\u7528\u4e00\u4e2a\u771f\u6b63\u7684\u5e93\uff0c\u5b83\u88ab\u6570\u767e\u4e07\u7528\u6237\u4f7f\u7528\uff08\u5e76\u9690\u5f0f\u6d4b\u8bd5\uff01\uff09\u591a\u5e74\u3002\u8fd9\u6837\u7684\u5e93\u5df2\u7ecf\u8bc1\u660e\u4e86\u5b83\u7684\u5065\u58ee\u6027\u3002<\/p>\n\n\n\n<p class=\"has-large-font-size\"><strong>\u5f53\u60a8\u5df2\u7ecf\u5728\u4f7f\u7528 Servlet 3.0 \u6216\u66f4\u9ad8\u7248\u672c\u65f6\uff0c\u8bf7\u4f7f\u7528\u539f\u751fAPI<\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u4f60\u81f3\u5c11\u4f7f\u7528 Servlet 3.0\uff08Tomcat 7\u3001Jetty 9\u3001JBoss AS 6\u3001GlassFish 3 \u7b49\uff0c\u5b83\u4eec\u81ea 2010 \u5e74\u4ee5\u6765\u5c31\u5df2\u7ecf\u5b58\u5728\uff09\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u4f7f\u7528\u63d0\u4f9b\u7684\u6807\u51c6&nbsp;<a href=\"http:\/\/docs.oracle.com\/javaee\/6\/api\/javax\/servlet\/http\/HttpServletRequest.html#getParts()\" target=\"_blank\" rel=\"noopener\"><code>API HttpServletRequest#getPart\uff08\uff09<\/code><\/a>&nbsp;\u6765\u6536\u96c6\u5355\u4e2a\u591a\u90e8\u5206\u8868\u5355\u6570\u636e\u9879\uff08\u5927\u591a\u6570 Servlet 3.0 \u5b9e\u73b0<em>\u5b9e\u9645\u4e0a<\/em>\u90fd\u4f7f\u7528 Apache Commons FileUpload \u6765\u63a9\u76d6\u8fd9\u4e00\u70b9\uff01\uff09\u3002\u6b64\u5916\uff0c\u666e\u901a\u8868\u5355\u5b57\u6bb5\u53ef\u901a\u8fc7\u5e38\u89c4\u65b9\u5f0f\u4f7f\u7528\u3002<code>getParameter()<\/code><\/p>\n\n\n\n<p>\u9996\u5148\u7528&nbsp;<a href=\"http:\/\/docs.oracle.com\/javaee\/6\/api\/javax\/servlet\/annotation\/MultipartConfig.html\" target=\"_blank\" rel=\"noopener\"><code>@MultipartConfig<\/code><\/a>&nbsp;\u6ce8\u91ca\u4f60\u7684 servlet\uff0c\u4ee5\u4fbf\u8ba9\u5b83\u8bc6\u522b\u548c\u652f\u6301\u8bf7\u6c42\uff0c\u4ece\u800c\u6b63\u5e38\u8fd0\u884c\u3002<code>multipart\/form-datagetPart()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">@WebServlet(\"\/upload\")\n@MultipartConfig\npublic class UploadServlet extends HttpServlet {\n    \/\/ ...\n}\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\uff0c\u6309\u5982\u4e0b\u65b9\u5f0f\u5b9e\u73b0\u5176\uff1a<code>doPost()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n    String description = request.getParameter(\"description\"); \/\/ Retrieves &lt;input type=\"text\" name=\"description\"&gt;\n    Part filePart = request.getPart(\"file\"); \/\/ Retrieves &lt;input type=\"file\" name=\"file\"&gt;\n    String fileName = Paths.get(filePart.getSubmittedFileName()).getFileName().toString(); \/\/ MSIE fix.\n    InputStream fileContent = filePart.getInputStream();\n    \/\/ ... (do your job here)\n}<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f.\u8fd9\u662fMSIE\u5bf9\u83b7\u53d6\u6587\u4ef6\u540d\u7684\u4e00\u4e2a\u4fee\u6b63\u3002\u8fd9\u4e2a\u6d4f\u89c8\u5668\u9519\u8bef\u5730\u5c06\u5b8c\u6574\u7684\u6587\u4ef6\u8def\u5f84\u4e0e\u6587\u4ef6\u540d\u4e00\u8d77\u53d1\u9001\uff0c\u800c\u4e0d\u662f\u53ea\u53d1\u9001\u6587\u4ef6\u540d\u3002<code>Path#getFileName()<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u60a8\u60f3\u901a\u8fc7\u4efb\u4e00\u65b9\u5f0f\u4e0a\u4f20\u591a\u4e2a\u6587\u4ef6\uff0c<code>multiple=\"true\"<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"markup\" class=\"language-markup line-numbers\">&lt;input type=\"file\" name=\"files\" multiple=\"true\" \/&gt;<\/code><\/pre>\n\n\n\n<p>\u6216\u91c7\u7528\u8001\u5f0f\u7684\u591a\u8def\u8f93\u5165\u65b9\u5f0f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"markup\" class=\"language-markup line-numbers\">&lt;input type=\"file\" name=\"files\" \/&gt;\n&lt;input type=\"file\" name=\"files\" \/&gt;\n&lt;input type=\"file\" name=\"files\" \/&gt;\n...<\/code><\/pre>\n\n\n\n<p>\u90a3\u4e48\u4f60\u53ef\u4ee5\u6309\u4ee5\u4e0b\u65b9\u6cd5\u6536\u96c6\u5b83\u4eec\uff08\u4e0d\u5e78\u7684\u662f\uff0c\u6ca1\u6709\u50cf\u8fd9\u4e00\u6837\u7684\u65b9\u6cd5\uff1a<code>request.getParts(\"files\")<\/code>\uff09\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n    \/\/ ...\n    List&lt;Part&gt; fileParts = request.getParts().stream().filter(part -&gt; \"files\".equals(part.getName()) &amp;&amp; part.getSize() &gt; 0).collect(Collectors.toList()); \/\/ Retrieves &lt;input type=\"file\" name=\"files\" multiple=\"true\"&gt;\n\n    for (Part filePart : fileParts) {\n        String fileName = Paths.get(filePart.getSubmittedFileName()).getFileName().toString(); \/\/ MSIE fix.\n        InputStream fileContent = filePart.getInputStream();\n        \/\/ ... (do your job here)\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"has-large-font-size\"><strong>\u5f53\u7248\u672c\u4e0d\u662f Servlet 3.1\u4ee5\u4e0a\u7684\u7248\u672c\u65f6\uff0c\u8bf7\u624b\u52a8\u83b7\u53d6\u63d0\u4ea4\u7684\u6587\u4ef6\u540d<\/strong><\/p>\n\n\n\n<p>\u8bf7\u6ce8\u610f\uff0c<a href=\"https:\/\/docs.oracle.com\/javaee\/7\/api\/javax\/servlet\/http\/Part.html#getSubmittedFileName()\" target=\"_blank\" rel=\"noopener\"><code>Part#getSubmittedFileName\uff08\uff09<\/code><\/a>&nbsp;\u662f\u5728 Servlet 3.1 \u4e2d\u5f15\u5165\u7684\uff08Tomcat 8\u3001Jetty 9\u3001WildFly 8\u3001GlassFish 4 \u7b49\uff0c\u5b83\u4eec\u81ea 2013 \u5e74\u4ee5\u6765\u5c31\u5df2\u7ecf\u5b58\u5728\u4e86\uff09\u3002\u5982\u679c\u4f60\u8fd8\u6ca1\u6709\u5728 Servlet 3.1 \u4e0a\uff08\u771f\u7684\u5417\uff1f\uff09\uff0c\u90a3\u4e48\u4f60\u9700\u8981\u4e00\u4e2a\u989d\u5916\u7684\u5b9e\u7528\u7a0b\u5e8f\u65b9\u6cd5\u6765\u83b7\u53d6\u63d0\u4ea4\u7684\u6587\u4ef6\u540d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">private static String getSubmittedFileName(Part part) {\n    for (String cd : part.getHeader(\"content-disposition\").split(\";\")) {\n        if (cd.trim().startsWith(\"filename\")) {\n            String fileName = cd.substring(cd.indexOf('=') + 1).trim().replace(\"\\\"\", \"\");\n            return fileName.substring(fileName.lastIndexOf('\/') + 1).substring(fileName.lastIndexOf('\\\\') + 1); \/\/ MSIE fix.\n        }\n    }\n    return null;\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">String fileName = getSubmittedFileName(filePart);<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610fMSIE\u5bf9\u83b7\u53d6\u6587\u4ef6\u540d\u7684\u4fee\u6b63\u3002\u8be5\u6d4f\u89c8\u5668\u9519\u8bef\u5730\u5c06\u5b8c\u6574\u7684\u6587\u4ef6\u8def\u5f84\u4e0e\u6587\u4ef6\u540d\u4e00\u8d77\u53d1\u9001\uff0c\u800c\u4e0d\u662f\u53ea\u53d1\u9001\u6587\u4ef6\u540d\u3002<\/p>\n\n\n\n<p class=\"has-large-font-size\"><strong>\u5f53\u7248\u672c\u5c0f\u4e8eServlet 3.0\u65f6\uff0c\u4f7f\u7528Apache Commons FileUpload<\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u4f60\u8fd8\u6ca1\u6709\u4f7f\u7528Servlet 3.0\uff08\u73b0\u5728\u8fd8\u4e0d\u5347\u7ea7\u5417\uff1f\u5b83\u662f\u5341\u591a\u5e74\u524d\u53d1\u5e03\u7684\uff01\uff09\uff0c\u901a\u5e38\u7684\u505a\u6cd5\u662f\u5229\u7528<a href=\"http:\/\/commons.apache.org\/fileupload\" target=\"_blank\" rel=\"noopener\">Apache Commons FileUpload<\/a>\u6765\u89e3\u6790\u591a\u4e2a\u8868\u5355\u6570\u636e\u8bf7\u6c42\u3002\u5b83\u6709\u4e00\u4e2a\u5f88\u597d\u7684<a href=\"http:\/\/commons.apache.org\/fileupload\/using.html\" target=\"_blank\" rel=\"noopener\">\u7528\u6237\u6307\u5357<\/a>\u548c<a href=\"http:\/\/commons.apache.org\/fileupload\/faq.html\" target=\"_blank\" rel=\"noopener\">\u5e38\u89c1\u95ee\u9898\u89e3\u7b54<\/a>\uff08\u4ed4\u7ec6\u6d4f\u89c8\u4e24\u8005\uff09\u3002\u8fd8\u6709O&#8217;Reilly\uff08\u201c<a href=\"http:\/\/www.servlets.com\/cos\/\" target=\"_blank\" rel=\"noopener\">cos<\/a>\u201d\uff09\uff0c\u4f46\u5b83\u6709\u4e00\u4e9b\uff08\u5c0f\uff09\u9519\u8bef\uff0c\u5e76\u4e14\u591a\u5e74\u6765\u4e0d\u518d\u79ef\u6781\u7ef4\u62a4\u3002\u6211\u4e0d\u5efa\u8bae\u4f7f\u7528\u5b83\u3002Apache Commons FileUpload\u4ecd\u7136\u4fdd\u6301\u6d3b\u8dc3\uff0c\u76ee\u524d\u975e\u5e38\u6210\u719f\u3002<code>MultipartRequest<\/code><\/p>\n\n\n\n<p>\u4e3a\u4e86\u4f7f\u7528Apache Commons FileUpload\uff0c\u60a8\u7684web\u5e94\u7528\u7a0b\u5e8f\u4e2d\u81f3\u5c11\u9700\u8981\u4ee5\u4e0b\u6587\u4ef6\uff1a<code>\/WEB-INF\/lib<\/code><\/p>\n\n\n\n<ul>\n<li><a href=\"http:\/\/commons.apache.org\/proper\/commons-fileupload\/download_fileupload.cgi\" target=\"_blank\" rel=\"noopener\"><code>commons-fileupload.jar<\/code><\/a><\/li>\n\n\n\n<li><a href=\"http:\/\/commons.apache.org\/proper\/commons-io\/download_io.cgi\" target=\"_blank\" rel=\"noopener\"><code>commons-io.jar<\/code><\/a><\/li>\n<\/ul>\n\n\n\n<p>\u60a8\u6700\u521d\u7684\u5c1d\u8bd5\u5931\u8d25\u5f88\u53ef\u80fd\u662f\u56e0\u4e3a\u60a8\u5fd8\u8bb0\u4e86\u516c\u5171 IO\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u542f\u52a8\u793a\u4f8b\uff0c\u5728\u4f7f\u7528Apache Commons FileUpload <code>doPost()UploadServlet<\/code> \u65f6\uff0c\u60a8\u7684\u4ee3\u7801\u53ef\u80fd\u662f\u4ec0\u4e48\u6837\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n    try {\n        List&lt;FileItem&gt; items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);\n        for (FileItem item : items) {\n            if (item.isFormField()) {\n                \/\/ Process regular form field (input type=\"text|radio|checkbox|etc\", select, etc).\n                String fieldName = item.getFieldName();\n                String fieldValue = item.getString();\n                \/\/ ... (do your job here)\n            } else {\n                \/\/ Process form file field (input type=\"file\").\n                String fieldName = item.getFieldName();\n                String fileName = FilenameUtils.getName(item.getName());\n                InputStream fileContent = item.getInputStream();\n                \/\/ ... (do your job here)\n            }\n        }\n    } catch (FileUploadException e) {\n        throw new ServletException(\"Cannot parse multipart request.\", e);\n    }\n\n    \/\/ ...\n}<\/code><\/pre>\n\n\n\n<p>\u975e\u5e38\u91cd\u8981\u7684\u662f\uff0c\u4f60\u4e0d\u8981\u4e8b\u5148\u5728\u540c\u4e00\u4e2a\u8bf7\u6c42\u4e2d\u8c03\u7528 ,,,,,,,,,, \u7b49\u3002\u5426\u5219servlet\u5bb9\u5668\u4f1a\u8bfb\u53d6\u5e76\u89e3\u6790\u8bf7\u6c42\u4f53\uff0c\u4ece\u800cApache Commons FileUpload\u4f1a\u5f97\u5230\u4e00\u4e2a\u7a7a\u7684\u8bf7\u6c42\u4f53\u3002\u53e6\u89c1\uff1a&nbsp;<a href=\"https:\/\/stackoverflow.com\/questions\/13881272\/servletfileuploadparserequestrequest-returns-an-empty-list\" target=\"_blank\" rel=\"noopener\">ServletFileUpload#parseRequest(request) returns an empty list<\/a>.<code>getParameter()getParameterMap()getParameterValues()getInputStream()getReader()<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f.\u8fd9\u662fMSIE\u5bf9\u83b7\u53d6\u6587\u4ef6\u540d\u7684\u4e00\u4e2a\u4fee\u6b63\u3002\u8fd9\u4e2a\u6d4f\u89c8\u5668\u9519\u8bef\u5730\u5c06\u5b8c\u6574\u7684\u6587\u4ef6\u8def\u5f84\u4e0e\u540d\u79f0\u4e00\u8d77\u53d1\u9001\uff0c\u800c\u4e0d\u662f\u53ea\u53d1\u9001\u6587\u4ef6\u540d\u3002<code>FilenameUtils#getName()<\/code><\/p>\n\n\n\n<p>\u6216\u8005\uff0c\u60a8\u4e5f\u53ef\u4ee5\u5c06\u6240\u6709\u8fd9\u4e9b\u5305\u88c5\u5728\u4e00\u4e2a\u81ea\u52a8\u89e3\u6790\u6240\u6709\u5185\u5bb9\u4e2d\uff0c\u5e76\u5c06\u5185\u5bb9\u653e\u56de\u8bf7\u6c42\u7684\u53c2\u6570\u6620\u5c04\u4e2d\uff0c\u4ee5\u4fbf\u60a8\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\u901a\u5e38\u7684\u65b9\u5f0f\u5e76\u901a\u8fc7.<a href=\"http:\/\/balusc.blogspot.com\/2007\/11\/multipartfilter.html\" target=\"_blank\" rel=\"noopener\">\u60a8\u53ef\u4ee5\u5728\u8fd9\u7bc7\u535a\u5ba2\u6587\u7ae0\u4e2d\u627e\u5230\u4e00\u4e2a\u793a\u4f8b<\/a>\u3002<code>Filterrequest.getParameter()request.getAttribute()<\/code><\/p>\n\n\n\n<p class=\"has-large-font-size\"><strong>GlassFish3 \u9519\u8bef\u4ecd\u8fd4\u56de\u7684\u89e3\u51b3\u65b9\u6cd5<code>getParameter()null<\/code><\/strong><\/p>\n\n\n\n<p>\u8bf7\u6ce8\u610f\uff0c\u65e9\u4e8e 3.1.2 \u7684 Glassfish \u7248\u672c\u6709\u4e00\u4e2a<a href=\"http:\/\/java.net\/jira\/browse\/GLASSFISH-16740\" target=\"_blank\" rel=\"noopener\">\u9519\u8bef<\/a>\uff0c\u5176\u4e2d\u4ecd\u7136\u8fd4\u56de .\u5982\u679c\u60a8\u7684\u76ee\u6807\u662f\u8fd9\u6837\u7684\u5bb9\u5668\u5e76\u4e14\u65e0\u6cd5\u5347\u7ea7\u5b83\uff0c\u5219\u9700\u8981\u501f\u52a9\u6b64\u5b9e\u7528\u7a0b\u5e8f\u65b9\u6cd5\u4ece\u4e2d\u63d0\u53d6\u503c\uff1a<code>getParameter()nullgetPart()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">private static String getValue(Part part) throws IOException {\n    BufferedReader reader = new BufferedReader(new InputStreamReader(part.getInputStream(), \"UTF-8\"));\n    StringBuilder value = new StringBuilder();\n    char[] buffer = new char[1024];\n    for (int length = 0; (length = reader.read(buffer)) &gt; 0;) {\n        value.append(buffer, 0, length);\n    }\n    return value.toString();\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">String description = getValue(request.getPart(\"description\")); \/\/ Retrieves &lt;input type=\"text\" name=\"description\"&gt;<\/code><\/pre>\n\n\n\n<p class=\"has-large-font-size\"><strong>\u4fdd\u5b58\u4e0a\u4f20\u7684\u6587\u4ef6\uff08\u8bf7\u52ff\u4f7f\u7528\uff01<code>getRealPath()part.write()<\/code>\uff09<\/strong><\/p>\n\n\n\n<p>\u6709\u5173\u5c06\u83b7\u5f97\u7684\uff08\u5982\u4e0a\u8ff0\u4ee3\u7801\u7247\u6bb5\u6240\u793a\u7684\u53d8\u91cf\uff09\u6b63\u786e\u4fdd\u5b58\u5230\u78c1\u76d8\u6216\u6570\u636e\u5e93\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u4ee5\u4e0b\u7b54\u6848\uff1a<code>InputStream<\/code><code>fileContent<\/code><\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/18664579\/recommended-way-to-save-files-uploaded-to-a-tomcat-servlet\/18664715#18664715\" target=\"_blank\" rel=\"noopener\">\u5728 servlet \u5e94\u7528\u7a0b\u5e8f\u4e2d\u4fdd\u5b58\u4e0a\u4f20\u6587\u4ef6\u7684\u63a8\u8350\u65b9\u6cd5<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/7033676\/how-to-upload-an-image-and-save-it-in-database\/7033945#7033945\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u4e0a\u4f20\u56fe\u7247\u5e76\u5c06\u5176\u4fdd\u5b58\u5728\u6570\u636e\u5e93\u4e2d\uff1f<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/19138706\/how-to-convert-part-to-blob-so-i-can-store-it-in-mysql\/19139125#19139125\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5c06\u90e8\u5206\u8f6c\u6362\u4e3a Blob\uff0c\u4ee5\u4fbf\u6211\u53ef\u4ee5\u5c06\u5176\u5b58\u50a8\u5728 MySQL \u4e2d\uff1f<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"has-large-font-size\"><strong>\u4e3a\u4e0a\u4f20\u7684\u6587\u4ef6\u63d0\u4f9b\u670d\u52a1<\/strong><\/p>\n\n\n\n<p>\u6709\u5173\u5c06\u4fdd\u5b58\u7684\u6587\u4ef6\u4ece\u78c1\u76d8\u6216\u6570\u636e\u5e93\u6b63\u786e\u63d0\u4f9b\u56de\u5ba2\u6237\u7aef\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u4ee5\u4e0b\u7b54\u6848\uff1a<\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/4543936\/load-images-from-outside-of-webapps-webcontext-deploy-folder-using-hgraphi\/4543951#4543951\" target=\"_blank\" rel=\"noopener\">\u4f7f\u7528 &lt;h\uff1agraphicImage&gt; \u6216 &lt;img&gt; \u6807\u7b7e\u4ece webapps \/ webcontext \/ \u90e8\u7f72\u6587\u4ef6\u5939\u5916\u90e8\u52a0\u8f7d\u56fe\u50cf<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/2340406\/how-to-retrieve-and-display-images-from-a-database-in-a-jsp-page\/2341322#2341322\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 JSP \u9875\u9762\u4e2d\u68c0\u7d22\u548c\u663e\u793a\u6570\u636e\u5e93\u4e2d\u7684\u56fe\u50cf\uff1f<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/1812244\/simplest-way-to-serve-static-data-from-outside-the-application-server-in-a-java\/1812356#1812356\" target=\"_blank\" rel=\"noopener\">\u5728 Java Web \u5e94\u7528\u7a0b\u5e8f\u4e2d\u4ece\u5e94\u7528\u7a0b\u5e8f\u670d\u52a1\u5668\u5916\u90e8\u63d0\u4f9b\u9759\u6001\u6570\u636e\u7684\u6700\u7b80\u5355\u65b9\u6cd5<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/132052\/servlet-for-serving-static-content\/29991447#29991447\" target=\"_blank\" rel=\"noopener\">\u652f\u6301 HTTP \u7f13\u5b58\u7684\u9759\u6001\u8d44\u6e90 servlet \u7684\u62bd\u8c61\u6a21\u677f<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"has-large-font-size\"><strong>Ajax <\/strong>\u683c\u5f0f<\/h2>\n\n\n\n<p>\u524d\u5f80\u4ee5\u4e0b\u6709\u5173\u5982\u4f55\u4f7f\u7528 Ajax\uff08\u548c jQuery\uff09\u4e0a\u4f20\u7684\u7b54\u6848\u3002\u8bf7\u6ce8\u610f\uff0c\u4e0d\u9700\u8981\u4e3a\u6b64\u66f4\u6539\u7528\u4e8e\u6536\u96c6\u8868\u5355\u6570\u636e\u7684 servlet \u4ee3\u7801\uff01\u53ea\u6709\u4f60\u7684\u54cd\u5e94\u65b9\u5f0f\u53ef\u80fd\u4f1a\u6539\u53d8\uff0c\u4f46\u8fd9\u76f8\u5f53\u5fae\u4e0d\u8db3\u9053\uff08\u5373\uff0c\u4e0d\u662f\u8f6c\u53d1\u5230 JSP\uff0c\u800c\u662f\u6253\u5370\u4e00\u4e9b JSON \u6216 XML \u751a\u81f3\u7eaf\u6587\u672c\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u8d1f\u8d23 Ajax \u8c03\u7528\u7684\u811a\u672c\u6240\u671f\u671b\u7684\u4efb\u4f55\u5185\u5bb9\uff09\u3002<\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/6914152\/how-to-upload-files-to-server-using-jsp-servlet-and-ajax\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u4f7f\u7528 JSP\/Servlet \u548c Ajax \u5c06\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668\uff1f<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/9395911\/sending-a-file-as-multipart-through-xmlhttprequest\" target=\"_blank\" rel=\"noopener\">\u901a\u8fc7 XMLHttpRequest \u4ee5\u591a\u90e8\u5206\u5f62\u5f0f\u53d1\u9001\u6587\u4ef6<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/7114087\/html5-file-upload-to-java-servlet\" target=\"_blank\" rel=\"noopener\">HTML5 \u62d6\u653e\u6587\u4ef6\u4e0a\u4f20\u5230 Java Servlet<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u8f6c\u8f7d\u81ea\uff1a<a href=\"https:\/\/stackoverflow.com\/questions\/2422468\/how-can-i-upload-files-to-a-server-using-jsp-servlet\" target=\"_blank\" rel=\"noopener\">java &#8211; How can I upload files to a server using JSP\/Servlet? &#8211; Stack Overflow<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ecb\u7ecd \u8981\u6d4f\u89c8\u5e76\u9009\u62e9\u8981\u4e0a\u4f20\u7684\u6587\u4ef6\uff0c\u60a8\u9700\u8981\u8868\u5355\u4e2d\u7684 H&hellip;<\/p>\n","protected":false},"author":1,"featured_media":561,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[24,25,2,5],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/scutvk.cn\/wp-content\/uploads\/2023\/01\/Apache_Tomcat_Logo.png","_links":{"self":[{"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/posts\/555"}],"collection":[{"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=555"}],"version-history":[{"count":3,"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/posts\/555\/revisions"}],"predecessor-version":[{"id":562,"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/posts\/555\/revisions\/562"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/media\/561"}],"wp:attachment":[{"href":"https:\/\/scutvk.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}