JAVA Servlet 上傳批量上傳大檔案
阿新 • • 發佈：2019-01-25
新建類 UploadServlet
在web.xml 中配置:package org.action; import java.io.File; import java.io.IOException; import java.util.Iterator; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; @SuppressWarnings("unchecked") public class UploadServlet extends HttpServlet{ private static final long serialVersionUID = 1L ; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp) ; } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { DiskFileItemFactory factory = new DiskFileItemFactory() ; factory.setSizeThreshold( 8192 ) ; String tempPath = request.getSession().getServletContext().getRealPath( "/") + "/upload" ; File file = new File( tempPath ) ; if(!file.isDirectory()){ file.mkdirs(); } factory.setRepository( file ) ; ServletFileUpload upload = new ServletFileUpload( factory ) ; List<FileItem> items; try { items = upload.parseRequest(request); Iterator<FileItem> itr = items.iterator(); while (itr.hasNext()) {// 依次處理每個 form field FileItem item = (FileItem) itr.next(); if(!item.isFormField()){ /* 判斷是否為表單控制元件（非File控制元件），如果不是表單控制元件，則上傳此檔案 */ File savedFile = new File( tempPath , item.getName() ) ; item.write(savedFile) ; }else{/* 如果是表單控制元件，則儲存其值*/ System.out.println( item.getFieldName() + "-->" + item.getString() ) ; } } }catch (Exception e){ e.printStackTrace() ; } } }
<servlet> <servlet-name>upload</servlet-name> <servlet-class>org.action.UploadServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>upload</servlet-name> <url-pattern>/upload</url-pattern> </servlet-mapping>
頁面程式碼：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> </head> <body> <form action="<%=basePath %>upload" method="post" enctype="multipart/form-data"> <input type="file" name="file"/> <input value="name" name="name" type="text" /> <input type="submit"/> </form> </body> </html>
依賴的jar包，commons-fileupload-1.1.jar 和 commons-io-1.1.jar