servlet\u5b9e\u73b0\u6587\u4ef6\u4e0a\u4f20, \u901a\u5e38\u4f7f\u7528 fileUpload \u7ec4\u4ef6, \u8fd9\u662fapache\u5c01\u88c5\u7684\u5f00\u6e90\u5de5\u5177jar\u5305<\/p>\n\n\n\n
\u5bf9\u4e8e maven \u9879\u76ee, \u5bfc\u5165\u5982\u4e0b\u5750\u6807<\/p>\n\n\n\n
<!-- https:\/\/mvnrepository.com\/artifact\/commons-io\/commons-io -->\n<dependency>\n <groupId>commons-io<\/groupId>\n <artifactId>commons-io<\/artifactId>\n <version>2.4<\/version>\n<\/dependency>\n<!-- https:\/\/mvnrepository.com\/artifact\/commons-fileupload\/commons-fileupload -->\n<dependency>\n <groupId>commons-fileupload<\/groupId>\n <artifactId>commons-fileupload<\/artifactId>\n <version>1.3.1<\/version>\n<\/dependency><\/code><\/pre>\n\n\n\ncommons-fileupload.jar\u4f9d\u8d56\u4e8ecommons-io.jar, \u6240\u4ee5\u8fd92\u4e2ajar\u5305\u90fd\u9700\u8981\u4e0b\u8f7d<\/p>\n\n\n\n
\u5982\u679c\u8981\u76f4\u63a5\u4e0b\u8f7djar\u5305, \u53ef\u4ee5\u62f7\u8d1d\u4e0a\u8ff0\u5730\u5740\u5728 maven \u4e2d\u592e\u4ed3\u5e93\u4e0b\u8f7d, \u6216\u8005apache\u5b98\u7f51\u4e0b\u8f7d, \u8fd9\u91cc\u63d0\u4f9b\u4e00\u4e2a\u5907\u4efd\u4e0b\u8f7d<\/p>\n\n\n\n\n\n\n\n
\u524d\u7aef\u4ee3\u7801<\/h2>\n\n\n\n
\u524d\u7aef\u53ef\u4ee5\u901a\u8fc7 form \u8868\u5355\u63d0\u4ea4\u6587\u4ef6, \u6309\u7167\u5b98\u7f51\u7684\u8bf4\u6cd5, \u5b9e\u73b0\u65b9\u6cd5\u5982\u4e0b:<\/p>\n\n\n\n
- \u5fc5\u987b\u662fpost\u65b9\u5f0f<\/li>
- \u901a\u8fc7input\u4e0a\u4f20, \u5176\u4e2dtype\u662ffile, \u800cname\u662fspicture<\/li>
- form\u4e2d, \u5fc5\u987b\u6dfb\u52a0\u4e00\u4e2a\u5c5e\u6027 enctype=”multipart\/form-data”<\/li><\/ul>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <title>servlet\u6587\u4ef6\u4e0a\u4f20\u6d4b\u8bd5<\/title>\n<\/head>\n<body>\n <h2>\u628aaction\u7684\u8def\u5f84\u6362\u6210\u771f\u5b9e\u8def\u5f84\u518d\u6d4b\u8bd5<\/h2>\n <form action=\"\/xxx\/UploadServlet\" method=\"post\" enctype=\"multipart\/form-data\">\n \u5b66\u53f7:<input type=\"text\" name=\"sno\"\/><br\/>\n \u59d3\u540d:<input type=\"text\" name=\"sname\"\/><br\/>\n \u4e0a\u4f20\u7167\u7247:<input type=\"file\" name=\"spicture\"\/><br\/>\n <input type=\"submit\" value=\"\u63d0\u4ea4\" \/>\n <\/form>\n<\/body>\n<\/html><\/code><\/pre>\n\n\n\n\u540e\u7aef\u4ee3\u7801<\/h2>\n\n\n\n
\u540e\u7aef\u662f\u4e00\u4e2aservlet, \u5e94\u8be5\u76d1\u542c post, \u5982\u679c\u662fjsp\u9875\u9762, \u90a3\u4e48\u9700\u8981\u5224\u65adrequest.getmethod\u662f\u5426\u4e3apost<\/p>\n\n\n\n
import org.apache.commons.fileupload.FileItem;\nimport org.apache.commons.fileupload.FileUploadBase;\nimport org.apache.commons.fileupload.FileUploadException;\nimport org.apache.commons.fileupload.disk.DiskFileItemFactory;\nimport org.apache.commons.fileupload.servlet.ServletFileUpload;\n\nimport javax.servlet.ServletException;\nimport javax.servlet.annotation.WebServlet;\nimport javax.servlet.http.HttpServlet;\nimport javax.servlet.http.HttpServletRequest;\nimport javax.servlet.http.HttpServletResponse;\nimport java.io.File;\nimport java.io.IOException;\nimport java.util.List;\n\n@WebServlet(name = \"UploadServlet\", urlPatterns = \"\/UploadServlet\")\npublic class UploadServlet extends HttpServlet {\n protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n \/\/1.\u8bbe\u7f6e\u7f16\u7801\u548cmime\n request.setCharacterEncoding(\"utf-8\");\n response.setContentType(\"text\/html;charset=utf-8\");\n \/\/2.\u5224\u65ad\u8868\u5355\u662f\u5426\u5b58\u5728\u6587\u4ef6\n boolean isMultipart = ServletFileUpload.isMultipartContent(request);\n if(isMultipart){\n response.getWriter().println(\"\u5b58\u5728\u4e0a\u4f20\u6587\u4ef6<br>\");\n \/\/3.\u751f\u6210upload\u5bf9\u8c61, \u83b7\u53d6\u4e0a\u4f20\u5b57\u6bb5\n DiskFileItemFactory factory = new DiskFileItemFactory();\n ServletFileUpload upload = new ServletFileUpload(factory);\n upload.setSizeMax(1024*10);\n factory.setSizeThreshold(1024*5); \/\/\u8bbe\u7f6e\u5355\u4e2a\u7f13\u51b2\u6587\u4ef6\u5927\u5c0f\n File tempFile = new File(\"temp\");\n if (!tempFile.exists()){\n tempFile.mkdir(); \/\/\u521b\u5efa\u6b64\u6587\u4ef6\u5939\n }\n factory.setRepository(new File(\"temp\"));\/\/\u8bbe\u7f6e\u7f13\u51b2\u6587\u4ef6\u7684\u4f4d\u7f6e\n List<FileItem> items = null;\n try {\n items = upload.parseRequest(request); \/\/\u83b7\u53d6\u53c2\u6570\u6240\u6709\u7684\u53c2\u6570\u5b57\u6bb5\n }catch(FileUploadBase.SizeLimitExceededException e){\n System.out.println(\"\u6587\u4ef6\u5927\u5c0f\u8d85\u8fc7\u9650\u5236,\u5fc5\u987b\u662f10kb\u4ee5\u4e0b\");\n response.getWriter().write(\"\u6587\u4ef6\u5927\u5c0f\u8d85\u8fc7\u9650\u5236, \u5fc5\u987b\u662f10kb\u4ee5\u4e0b<br>\");\n return;\n }catch (FileUploadException e) {\n e.printStackTrace();\n }\n \/\/4.\u5224\u65ad\u8be5\u5b57\u6bb5\u662ffile\u5b57\u6bb5, \u8fd8\u662f\u666e\u901a\u7684\u8868\u5355\u5b57\u6bb5\n for(FileItem item : items){\n if(item.isFormField()){ \/\/\u662f\u666e\u901a\u5b57\u6bb5\n if(item.getFieldName().equals(\"sno\"))\n {\n String sno = item.getString(); \/\/\u83b7\u53d6\u5b66\u53f7\n System.out.println(\"\u5b66\u53f7\u662f:\"+sno);\n }else if (item.getFieldName().equals(\"sname\")){\n String sname = item.getString(\"UTF-8\");\/\/\u83b7\u53d6\u59d3\u540d\n System.out.println(\"\u59d3\u540d\u662f:\"+sname);\n }\n }else{ \/\/\u662f\u6587\u4ef6\u5b57\u6bb5spicture\n \/\/5.\u4e0a\u4f20\u6587\u4ef6\n String fileName = item.getName(); \/\/\u8fd9\u4e2a\u540d\u79f0\u662fform\u63d0\u4ea4\u7684\u5b57\u6bb5, ie\u53ef\u80fd\u662f\u7edd\u5bf9\u8def\u5f84\n \/\/5.1\u9650\u5236\u6587\u4ef6\u7c7b\u578b\n boolean canUpload = false;\n if(fileName.endsWith(\".jpg\")||fileName.endsWith(\"png\")){\n canUpload = true;\n }else{\n System.out.println(\"\u4e0a\u4f20\u7c7b\u578b\u9519\u8bef,\u4ec5\u652f\u6301jpg\u6216png\");\n response.getWriter().write(\"\u4e0a\u4f20\u7c7b\u578b\u9519\u8bef,\u4ec5\u652f\u6301jpg\u6216png<br>\");\n return; \/\/\u7ec8\u6b62\u4e0a\u4f20\n }\n File uploadFile = new File(\"uploads\");\n if(!uploadFile.exists()){\n uploadFile.mkdir();\n }\n String path = uploadFile.getAbsolutePath();\/\/\u4e0a\u4f20\u4fdd\u5b58\u7684\u6587\u4ef6\u5939\n File file = new File(path,fileName);\n try {\n item.write(file); \/\/\u4e0a\u4f20\n } catch (Exception e) {\n e.printStackTrace();\n }\n System.out.println(fileName+\"\u4e0a\u4f20\u6210\u529f\");\n response.getWriter().print(fileName+\"\u4e0a\u4f20\u6210\u529f!\");\n return;\n }\n }\n }else{\n \/\/\u6ca1\u6709\u4e0a\u4f20\u7684\u6587\u4ef6\n response.getWriter().println(\"\u60a8\u6ca1\u6709\u9009\u62e9\u4e0a\u4f20\u6587\u4ef6\");\n }\n }\n protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n request.setCharacterEncoding(\"utf-8\");\n }\n}<\/code><\/pre>\n\n\n\n\u9650\u5236\u6587\u4ef6\u7c7b\u578b\u548c\u5927\u5c0f<\/h2>\n\n\n\n
\u5bf9\u6587\u4ef6\u7c7b\u578b\u4ee5\u53ca\u6587\u4ef6\u5927\u5c0f, \u53ef\u4ee5\u7528\u524d\u7aef\u6216\u540e\u7aef\u9650\u5236, \u524d\u7aef\u53ef\u4ee5\u7528js\u5224\u65ad<\/p>\n\n\n\n
1.\u9650\u5236\u6587\u4ef6\u7c7b\u578b<\/p>\n\n\n\n
\u5728\u83b7\u53d6\u6587\u4ef6\u540d\u540e, \u4f7f\u7528 .endwith \u5224\u65ad\u6587\u4ef6\u540d\u662f\u5426\u4ee5 xxx\u4e3a\u540e\u7f00, \u6b64\u65f6\u5c31\u80fd\u591f\u5224\u65ad\u5230\u6587\u4ef6\u7684\u540e\u7f00\u4e86<\/p>\n\n\n\n
\u4e00\u65e6\u6587\u4ef6\u540e\u7f00\u4e0d\u7b26\u5408, \u90a3\u4e48\u5c31\u7ec8\u6b62\u4e0a\u4f20\u5e76\u8fd4\u56de\u9519\u8bef<\/p>\n\n\n\n
2.\u9650\u5236\u6587\u4ef6\u5927\u5c0f<\/p>\n\n\n\n
\u4f7f\u7528 upload \u5bf9\u8c61\u7684 setSizeMax() \u65b9\u6cd5, \u5176\u4e2d\u5355\u4f4d\u662fb, \u6bd4\u5982\u8981\u8bbe\u7f6e 10KB, \u90a3\u4e48\u5927\u5c0f\u4e3a setSizeMax(1024*10);<\/p>\n\n\n\n
\u6b64\u5b57\u6bb5\u5e94\u8be5\u653e\u5728\u89e3\u6790form\u5b57\u6bb5\u4e4b\u524d, \u5426\u5219\u4e0d\u8d77\u4f5c\u7528<\/p>\n\n\n\n
\u53ef\u4ee5\u6355\u83b7\u4e00\u4e2a FileUploadBase.SizeLimitExceededException, \u5373\u6587\u4ef6\u5927\u5c0f\u8d85\u8fc7\u6700\u5927\u9650\u5236\u7684\u9519\u8bef.<\/p>\n\n\n\n
3.\u6b64\u5916, \u8fd8\u53ef\u4ee5\u8bbe\u7f6e\u4e0a\u4f20\u6587\u4ef6\u7684\u7f13\u51b2\u5927\u5c0f\u548c\u76ee\u5f55<\/p>\n\n\n\n
factory.setSizeThreshold(1024*5); \/\/\u5355\u4e2a\u7f13\u51b2\u6587\u4ef6\u5927\u5c0f5kb\nfactory.setRepository(\"uploadtemp\"); \/\/\u8bbe\u7f6e\u7f13\u51b2\u76ee\u5f55<\/code><\/pre>\n\n\n\n\u9650\u5236\u4ee3\u7801\u9ed8\u8ba4\u5df2\u6dfb\u52a0\u5728 uploadServlet\u4e2d, \u4e0d\u9700\u8981\u65f6\u624b\u52a8\u5220\u9664\u5373\u53ef.<\/p>\n","protected":false},"excerpt":{"rendered":"
servlet\u5b9e\u73b0\u6587\u4ef6\u4e0a\u4f20, \u901a\u5e38\u4f7f\u7528 fileUpload \u7ec4\u4ef6, \u8fd9\u662fapache\u5c01\u88c5\u7684\u5f00\u6e90\u5de5\u5177jar\u5305 … \u7ee7\u7eed\u9605\u8bfb servlet\u6587\u4ef6\u4e0a\u4f20<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/1"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/comments?post=1"}],"version-history":[{"count":3,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/1\/revisions"}],"predecessor-version":[{"id":18,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/1\/revisions\/18"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/media?parent=1"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/categories?post=1"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/tags?post=1"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}