新建處理文件上傳的Servlet<\/p>
package com.load;\r\n\r\nimport java.io.File;\r\nimport java.io.IOException;\r\nimport java.util.List;\r\nimport javax.servlet.ServletContext;\r\nimport javax.servlet.ServletException;\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 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@WebServlet(\"\/uploadServlet\")\r\npublic class uploadServlet extends HttpServlet {\r\n private static final long serialVersionUID = 1L;\r\n public uploadServlet() {\r\n super();\r\n }\r\n \/* fileupload 包中， HTTP 請求中的復(fù)雜表單元素都被看做一個 FileItem 對象；\r\n * FileItem 對象必須由 ServletFileUpload 類中的 parseRequest() 方法解析 HTTP 請求\r\n * （即被包裝之后的 HttpServletRequest 對象）出來，即分離出具體的文本表單和上傳文件\r\n * *\/\r\n protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n \/\/通過isMultipartContent()方法：分析請求里面是不是有文件上的請求，\r\n boolean isMultipart = ServletFileUpload.isMultipartContent(request);\r\n if(isMultipart){\r\n \/\/創(chuàng)建可設(shè)置的磁盤節(jié)點(diǎn)工廠\r\n DiskFileItemFactory factory = new DiskFileItemFactory();\r\n \/\/獲取請求的上下文信息\r\n ServletContext servletContext = request.getServletContext();\r\n \/\/緩存目錄，每個服務(wù)器特定的目錄\r\n File repository = (File) servletContext.getAttribute(\"javax.servlet.context.tempdir\");\r\n \/\/設(shè)置服務(wù)器的緩存目錄\r\n factory.setRepository(repository);\r\n \/\/ServletFileUpload 對象的創(chuàng)建需要依賴于 FileItemFactory \r\n \/\/工廠將獲得的上傳文件 FileItem 對象保存至服務(wù)器硬盤，即 DiskFileItem 對象。\r\n ServletFileUpload upload = new ServletFileUpload(factory);\r\n try {\r\n \/\/解析即被包裝之后的 HttpServletRequest對象，既是分離文本表單和上傳文件（http請求會被包裝為HttpServletRequest）\r\n List items = upload.parseRequest(request);\r\n for(FileItem item:items){\r\n String fieldName = item.getFieldName(); \r\n String fileName = item.getName();\r\n String contentType = item.getContentType();\r\n boolean isInMemory = item.isInMemory();\r\n long sizeInBytes = item.getSize();\r\n \/\/實例化一個文件\r\n \/\/request.getRealPath(獲取真實路徑)\r\n File file = new File(request.getRealPath(\"\/\")+\"\/loads\"+fileName.substring(fileName.lastIndexOf(\"\\\\\")+1,fileName.length()));\r\n item.write(file);\r\n }\r\n } catch (FileUploadException e) {\r\n e.printStackTrace();\r\n } catch (Exception e) {\r\n \r\n e.printStackTrace();\r\n }\r\n }\r\n }\r\n\r\n protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n doGet(request, response);\r\n }\r\n}<\/pre>(第二種上傳的方法)<\/p>
新建Jsp頁面(同上，只是路徑改變下)<\/p>
<%@ page language=\"java\" contentType=\"text\/html; charset=UTF-8\"\r\n pageEncoding=\"UTF-8\"%>\r\n\r\n\r\n\r\n\r\nupload file<\/title>\r\n<\/head>\r\n<body>
<h1><a href="http://m.miracleart.cn/">国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂</a></h1>\r\n <!--這里的<%=request.getContextPath()%>是表示項目的絕對路徑，也就是說不管你以后將項目拷貝到哪個位置，它都會找到準(zhǔn)確的路徑 -->\r\n <form action=\"<%=request.getContextPath()%>\/uploadservlet1\" enctype=\"multipart\/form-data\" method=\"post\">\r\n <span>選擇文件：<\/span><input type=\"file\" name=\"file1\">\r\n <input type=\"submit\" value=\"上傳\">\r\n <\/form>\r\n<\/body>\r\n<\/html>\r\n\r\nJSP頁面<\/pre><p>建立Servlet處理上傳<\/p><pre class='brush:php;toolbar:false;'>package com.load;\r\n\r\nimport java.io.File;\r\nimport java.io.FileOutputStream;\r\nimport java.io.IOException;\r\nimport java.io.InputStream;\r\nimport java.io.OutputStream;\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@WebServlet(\"\/uploadservlet1\")\r\n@MultipartConfig(location=\"\")\r\npublic class uploadservlet1 extends HttpServlet {\r\n private static final long serialVersionUID = 1L;\r\n public uploadservlet1() {\r\n super();\r\n }\r\n\r\n protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n response.setContentType(\"text\/html;charset=UTF-8\");\r\n request.setCharacterEncoding(\"utf-8\");\r\n \r\n \/\/取得上傳文件，讀取文件\r\n Part part = request.getPart(\"file1\");\r\n \/\/定義一個變量去接收文件名\r\n String filename = null;\r\n \/\/Content-Disposition: 就是當(dāng)用戶想把請求所得的內(nèi)容存為一個文件的時候提供一個默認(rèn)的文件名\r\n \/\/Content-Disposition：告訴瀏覽器以下載的方式打開文件\r\n for (String content : part.getHeader(\"content-disposition\").split(\";\")) {\r\n System.out.println(content);\r\n \/\/取得文件名\r\n if (content.trim().startsWith(\"filename\")) {\r\n \/\/截取文件名\r\n filename = content.substring(\r\n content.indexOf('=') + 1).trim().replace(\"\\\"\", \"\");\r\n }\r\n }\r\n \/\/輸出流\r\n OutputStream out = null;\r\n \/\/輸入流\r\n InputStream filecontent = null;\r\n \/\/File.separator 取得系統(tǒng)的分割線等數(shù)據(jù)\r\n out = new FileOutputStream(new File(\"e:\/loads\" + File.separator + filename));\r\n int read;\r\n \/\/獲得一個輸入流\r\n filecontent = part.getInputStream();\r\n final byte[] bytes = new byte[1024];\r\n \r\n while ((read = filecontent.read(bytes)) != -1) {\r\n out.write(bytes, 0, read);\r\n }\r\n System.out.println(\"New file \" + filename + \" created at \" + \"\/loads\");\r\n }\r\n\r\n protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n \/\/ TODO Auto-generated method stub\r\n doGet(request, response);\r\n }\r\n}<\/pre><p>(第三種上傳的方法)<\/p><p>這里使用的是jspSmartUpload包上傳下載，筆者認(rèn)為這種上傳下載較為簡單，但是好像不是很多人用，不懂，下載地址在這里(點(diǎn)我下載)<\/p><p>創(chuàng)建HTML頁面<\/p><pre class='brush:php;toolbar:false;'><!DOCTYPE html>\r\n<html>\r\n<head>\r\n<meta http-equiv=\"Content-Type\" content=\"text\/html; charset=UTF-8\">\r\n<title>上傳文件<\/title>\r\n<\/head>\r\n<body>\r\n <p> <\/p>\r\n <p align=\"center\">上傳文件選擇<\/p>\r\n <form method=\"post\" Action=\"..\/DouploadServlet\" enctype=\"multipart\/form-data\">\r\n <table width=\"75%\" border=\"1\" align=\"center\">\r\n <tr><td><div align=\"center\">\r\n 1.<input type=\"file\" name=\"file1\" >\r\n <\/div><\/td><\/tr>\r\n <tr><td><div align=\"center\">\r\n 2.<input type=\"file\" name=\"file2\" >\r\n <\/div><\/td><\/tr>\r\n <tr><td><div align=\"center\">\r\n 3.<input type=\"file\" name=\"file3\" >\r\n <\/div><\/td><\/tr>\r\n <tr><td><div align=\"center\">\r\n <input type=\"submit\" name=\"Submit\" value=\"上傳他\">\r\n <\/div><\/td><\/tr>\r\n <\/table>\r\n <\/form>\r\n<\/body>\r\n<\/html><\/pre><p>創(chuàng)建Servlet處理上傳文件<\/p><pre class='brush:php;toolbar:false;'>package com.load;\r\n\r\nimport java.io.IOException;\r\nimport java.io.PrintWriter;\r\n\r\nimport javax.servlet.ServletException;\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.jsp.JspFactory;\r\nimport javax.servlet.jsp.PageContext;\r\n\r\nimport com.jspsmart.upload.File;\r\nimport com.jspsmart.upload.SmartUpload;\r\nimport com.jspsmart.upload.SmartUploadException;\r\n@WebServlet(\"\/DouploadServlet\")\r\npublic class DouploadServlet extends HttpServlet {\r\n private static final long serialVersionUID = 1L;\r\n \r\n public DouploadServlet() {\r\n super();\r\n }\r\n\r\n protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n response.setContentType(\"text\/html;charset=UTF-8\");\r\n PrintWriter out = response.getWriter();\r\n \/\/新建一個智能上傳對象\r\n SmartUpload su = new SmartUpload();\r\n \/*\r\n * PageContext pageContext;\r\n HttpSession session;\r\n ServletContext application;\r\n ServletConfig config;\r\n JspWriter out;\r\n Object page = this;\r\n HttpServletRequest request, \r\n HttpServletResponse response\r\n 其中page對象，request和response已經(jīng)完成了實例化，而其它5個沒有實例化的對象通過下面的方式實例化\r\n pageContext = jspxFactory.getPageContext(this, request, response,null, true, 8192, true);\r\n *\/\r\n \/\/通過Jsp工廠類獲取上下文環(huán)境\r\n PageContext pagecontext = JspFactory.getDefaultFactory().getPageContext(this, request, response, null, true, 8192, true);\r\n \/\/上傳初始化\r\n su.initialize(pagecontext);\r\n\r\n \/\/上傳文件\r\n try {\r\n su.upload();\r\n \/\/將上傳文件保存到指定目錄\r\n int count = su.save(\"\/share\");\r\n out.println(count+\"個文件上傳成功!<br>\"+su.toString());\r\n } catch (SmartUploadException e) {\r\n e.printStackTrace();\r\n }\r\n \r\n \/\/逐個提取上傳文件信息\r\n for(int i=0;i<su.getFiles().getCount();i++){\r\n File file = su.getFiles().getFile(i);\r\n \/\/如果文件不存在\r\n if(file.isMissing()) continue;\r\n \r\n \/\/顯示當(dāng)前文件信息\r\n out.println(\"<table border=1>\");\r\n out.println(\"<tr><td>表單項名(FieldName)<\/td><\/td>\"+file.getFieldName()+\"<\/td><\/tr>\");\r\n out.println(\"<tr><td>文件長度<\/td><td>\"+file.getSize()+\"<\/td><\/tr>\");\r\n out.println(\"<tr><td>文件名<\/td><td>\"+file.getFileName()+\"<\/td><\/tr>\");\r\n out.println(\"<tr><td>文件擴(kuò)展名<\/td><td>\"+file.getFileExt()+\"<\/td><\/tr>\");\r\n out.println(\"<tr><td>文件全名<\/td><td>\"+file.getFilePathName()+\"<\/td><\/tr>\");\r\n out.println(\"<\/table><br>\");\r\n }\r\n }\r\n\r\n \/**\r\n * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)\r\n *\/\r\n protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n \/\/ TODO Auto-generated method stub\r\n doGet(request, response);\r\n }\r\n\r\n}<\/pre><p>3、實現(xiàn)文件下載<\/p><p>(第一種文件下載)<\/p><p>注意：該代碼是直接訪問Servlet類的<\/p><pre class='brush:php;toolbar:false;'>package com.load;\r\n\r\nimport java.io.FileInputStream;\r\nimport java.io.IOException;\r\nimport java.io.InputStream;\r\nimport java.io.OutputStream;\r\n\r\nimport javax.servlet.ServletException;\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\n\r\n\/\/直接使用Http:\/\/localhost:8080\/Test1\/download進(jìn)行下載，但是這個有缺陷，如果下載文件名中有中文，就會變成亂碼現(xiàn)象！\r\n@WebServlet(\"\/download\")\r\npublic class download extends HttpServlet {\r\n private static final long serialVersionUID = 1L;\r\n\r\n public download() {\r\n super();\r\n }\r\n protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n response.setContentType(\"text\/plain;charset=utf-8\");\r\n response.setCharacterEncoding(\"utf-8\");\r\n response.setHeader(\"Location\",\"中文.txt\");\r\n response.setHeader(\"Content-Disposition\", \"attachment; filename=\" + \"賬號.txt\");\r\n OutputStream outputStream = response.getOutputStream();\r\n InputStream inputStream = new FileInputStream(\"E:\/loads\"+\"\/賬號.txt\");\r\n byte[] buffer = new byte[1024];\r\n int i = -1;\r\n while ((i = inputStream.read(buffer)) != -1) {\r\n outputStream.write(buffer, 0, i);\r\n }\r\n outputStream.flush();\r\n outputStream.close();\r\n }\r\n protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n doGet(request, response);\r\n }\r\n\r\n}<\/pre><p>(第二種下載方法)<\/p><p>新建jsp頁面選擇下載<\/p><pre class='brush:php;toolbar:false;'><%@ page language=\"java\" contentType=\"text\/html; charset=UTF-8\"\r\n pageEncoding=\"UTF-8\"%>\r\n<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.01 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/html4\/loose.dtd\">\r\n<html>\r\n<head>\r\n<meta http-equiv=\"Content-Type\" content=\"text\/html; charset=UTF-8\">\r\n<title>下載<\/title>\r\n<\/head>\r\n<body>\r\n <a href=\"..\/DoDownloadServlet?filename=呵呵.txt\">點(diǎn)擊下載<\/a>\r\n<\/body>\r\n<\/html>\r\n\r\nJsp頁面代碼<\/pre><p>創(chuàng)建Servlet類進(jìn)行下載（注意：該下載如果文件名是中文的話，一樣會出現(xiàn)亂碼現(xiàn)象）<\/p><pre class='brush:php;toolbar:false;'>package com.load;\r\n\r\nimport java.io.BufferedInputStream;\r\nimport java.io.File;\r\nimport java.io.FileInputStream;\r\nimport java.io.IOException;\r\nimport java.io.InputStream;\r\nimport java.io.OutputStream;\r\nimport java.net.URLEncoder;\r\n\r\nimport javax.servlet.ServletException;\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.jsp.JspFactory;\r\nimport javax.servlet.jsp.PageContext;\r\n\r\nimport org.hsqldb.lib.StringUtil;\r\n\r\nimport com.jspsmart.upload.SmartUpload;\r\nimport com.jspsmart.upload.SmartUploadException;\r\n\r\n@WebServlet(\"\/DoDownloadServlet\")\r\npublic class DoDownloadServlet extends HttpServlet {\r\n private static final long serialVersionUID = 1L;\r\n\r\n public DoDownloadServlet() {\r\n super();\r\n }\r\n\r\n protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n \/\/得到下載文件的名稱\r\n \/\/String filename = request.getParameter(\"filename\");\r\n \/\/String filename = new String(FileName.getBytes(\"iso8859-1\"),\"UTF-8\");\r\n \/\/新建SmartUpload對象\r\n SmartUpload su = new SmartUpload();\r\n PageContext pagecontext = JspFactory.getDefaultFactory().getPageContext(this, request, response, null, true, 8192, true);\r\n \/\/上傳初始化\r\n su.initialize(pagecontext);\r\n \/\/設(shè)置禁止打開該文件\r\n su.setContentDisposition(null);\r\n \/\/下載文件\r\n try {\r\n su.downloadFile(\"\/listener\/\"+filename);\r\n } catch (SmartUploadException e) {\r\n \/\/ TODO Auto-generated catch block\r\n e.printStackTrace();\r\n }\r\n }\r\n\r\n protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n doGet(request, response);\r\n }\r\n}<\/pre><p>(第三種下載的方法)<\/p><p>同上的jsp頁面代碼，這里就不再重復(fù)了。<\/p><p>新建Serlvet類，實現(xiàn)下載功能（注意：這里文件名就算是中文名，也不會出現(xiàn)亂碼問題了！）<\/p><pre class='brush:php;toolbar:false;'>package com.load;\r\n\r\nimport java.io.BufferedInputStream;\r\nimport java.io.File;\r\nimport java.io.FileInputStream;\r\nimport java.io.IOException;\r\nimport java.io.InputStream;\r\nimport java.io.OutputStream;\r\nimport java.net.URLEncoder;\r\n\r\nimport javax.servlet.ServletException;\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.jsp.JspFactory;\r\nimport javax.servlet.jsp.PageContext;\r\n\r\nimport org.hsqldb.lib.StringUtil;\r\n\r\nimport com.jspsmart.upload.SmartUpload;\r\nimport com.jspsmart.upload.SmartUploadException;\r\n\r\n@WebServlet(\"\/DoDownloadServlet\")\r\npublic class DoDownloadServlet extends HttpServlet {\r\n private static final long serialVersionUID = 1L;\r\n\r\n public DoDownloadServlet() {\r\n super();\r\n }\r\n\r\n\r\n protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n \/\/獲得文件名稱\r\n String path1 = request.getParameter(\"filename\");\r\n \/\/獲得路徑名稱\r\n String path = request.getSession().getServletContext().getRealPath(\"\/listener\/\"+path1);\r\n \/\/ path是根據(jù)日志路徑和文件名拼接出來的\r\n File file = new File(path);\r\n String filename = file.getName();\r\n try {\r\n \/\/判斷是否是IE11\r\n Boolean flag= request.getHeader(\"User-Agent\").indexOf(\"like Gecko\")>0;\r\n \/\/IE11 User-Agent字符串:Mozilla\/5.0 (Windows NT 6.1; WOW64; Trident\/7.0; rv:11.0) like Gecko\r\n \/\/IE6~IE10版本的User-Agent字符串:Mozilla\/5.0 (compatible; MSIE 10.0; Windows NT 6.0; Trident\/6.0)\r\n if (request.getHeader(\"User-Agent\").toLowerCase().indexOf(\"msie\") >0||flag){\r\n filename = URLEncoder.encode(filename, \"UTF-8\");\/\/IE瀏覽器\r\n }else {\r\n \/\/先去掉文件名稱中的空格,然后轉(zhuǎn)換編碼格式為utf-8,保證不出現(xiàn)亂碼,\r\n \/\/這個文件名稱用于瀏覽器的下載框中自動顯示的文件名\r\n filename = new String(filename.replaceAll(\" \", \"\").getBytes(\"UTF-8\"), \"ISO8859-1\");\r\n \/\/firefox瀏覽器\r\n \/\/firefox瀏覽器User-Agent字符串: \r\n \/\/Mozilla\/5.0 (Windows NT 6.1; WOW64; rv:36.0) Gecko\/20100101 Firefox\/36.0\r\n } InputStream fis = new BufferedInputStream(new FileInputStream(path));\r\n byte[] buffer;\r\n buffer = new byte[fis.available()];\r\n fis.read(buffer);\r\n fis.close();\r\n response.reset();\r\n response.addHeader(\"Content-Disposition\", \"attachment;filename=\" +filename);\r\n response.addHeader(\"Content-Length\", \"\" + file.length());\r\n OutputStream os = response.getOutputStream();\r\n response.setContentType(\"application\/octet-stream\");\r\n os.write(buffer);\/\/ 輸出文件\r\n os.flush();\r\n os.close();\r\n } catch (IOException e) {\r\n e.printStackTrace();\r\n }\r\n System.out.println(filename);\r\n }\r\n\r\n protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n doGet(request, response);\r\n }\r\n}<\/pre><p><br><\/p>"} </script>
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<h1 class="Articlelist_txts_title">Javaweb - upload and download files</h1>
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<img class="lazy" data-src="https://img.php.cn/upload/avatar/000/000/013/6177b5643d1eb119.png" src="/static/imghw/default1.png" alt="高洛峰">
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<a href="http://m.miracleart.cn/member/13.html" class="author_name">高洛峰</a>
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<span id="377j5v51b" class="Articlelist_txts_time">Oct 10, 2016 am 09:11 AM</span>
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<hr />
<div id="377j5v51b" class="article_main php-article">
<div id="377j5v51b" class="article-list-left detail-content-wrap content">
<ins class="adsbygoogle"
style="display:block; text-align:center;"
data-ad-layout="in-article"
data-ad-format="fluid"
data-ad-client="ca-pub-5902227090019525"
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<p style="margin-top: 10px; font-size: 21px; line-height: 1.5; color: rgb(0, 0, 0); font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(238, 238, 221);">一、前言</p>
<p>在Javaweb中，上傳下載是經(jīng)常用到的功能，對于文件上傳，瀏覽器在上傳的過程中是以流的過程將文件傳給服務(wù)器，一般都是使用commons-fileupload這個包實現(xiàn)上傳功能，因為commons-fileupload依賴于commons-io這個包，所以需要下載這兩個包c(diǎn)ommons-fileupload-1.2.1.jar和commons-io-1.3.2.jar，筆者已經(jīng)打包好(點(diǎn)擊下載)</p>
<p>1、搭建環(huán)境</p>
<p>創(chuàng)建Web項目，將包導(dǎo)入到項目lib下</p>
<p><img src="/static/imghw/default1.png" data-src="https://img.php.cn//upload/image/354/923/511/1476061855199183.png" class="lazy" title="1476061855199183.png" alt="Javaweb - upload and download files"></p>
<p>2、實現(xiàn)文件上傳<br></p>
<p>(第一種上傳的方法)</p>
<p>新建upload.jsp頁面</p><pre class='brush:php;toolbar:false;'><%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>upload file</title>
</head>
<body>
<!--這里的<%=request.getContextPath()%>是表示項目的絕對路徑，也就是說不管你以后將項目拷貝到哪個位置，它都會找到準(zhǔn)確的路徑 -->
<form action="<%=request.getContextPath()%>/uploadServlet" enctype="multipart/form-data" method="post">
<span>選擇文件：</span><input type="file" name="file1">
<input type="submit" value="上傳">
</form>
</body>
</html></pre><p>新建處理文件上傳的Servlet</p><pre class='brush:php;toolbar:false;'>package com.load;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
@WebServlet("/uploadServlet")
public class uploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public uploadServlet() {
super();
}
/* fileupload 包中， HTTP 請求中的復(fù)雜表單元素都被看做一個 FileItem 對象；
* FileItem 對象必須由 ServletFileUpload 類中的 parseRequest() 方法解析 HTTP 請求
* （即被包裝之后的 HttpServletRequest 對象）出來，即分離出具體的文本表單和上傳文件
* */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//通過isMultipartContent()方法：分析請求里面是不是有文件上的請求，
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if(isMultipart){
//創(chuàng)建可設(shè)置的磁盤節(jié)點(diǎn)工廠
DiskFileItemFactory factory = new DiskFileItemFactory();
//獲取請求的上下文信息
ServletContext servletContext = request.getServletContext();
//緩存目錄，每個服務(wù)器特定的目錄
File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");
//設(shè)置服務(wù)器的緩存目錄
factory.setRepository(repository);
//ServletFileUpload 對象的創(chuàng)建需要依賴于 FileItemFactory
//工廠將獲得的上傳文件 FileItem 對象保存至服務(wù)器硬盤，即 DiskFileItem 對象。
ServletFileUpload upload = new ServletFileUpload(factory);
try {
//解析即被包裝之后的 HttpServletRequest對象，既是分離文本表單和上傳文件（http請求會被包裝為HttpServletRequest）
List<FileItem> items = upload.parseRequest(request);
for(FileItem item:items){
String fieldName = item.getFieldName();
String fileName = item.getName();
String contentType = item.getContentType();
boolean isInMemory = item.isInMemory();
long sizeInBytes = item.getSize();
//實例化一個文件
//request.getRealPath(獲取真實路徑)
File file = new File(request.getRealPath("/")+"/loads"+fileName.substring(fileName.lastIndexOf("\\")+1,fileName.length()));
item.write(file);
}
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}</pre><p>(第二種上傳的方法)</p><p>新建Jsp頁面(同上，只是路徑改變下)</p><pre class='brush:php;toolbar:false;'><%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>upload file</title>
</head>
<body>
<!--這里的<%=request.getContextPath()%>是表示項目的絕對路徑，也就是說不管你以后將項目拷貝到哪個位置，它都會找到準(zhǔn)確的路徑 -->
<form action="<%=request.getContextPath()%>/uploadservlet1" enctype="multipart/form-data" method="post">
<span>選擇文件：</span><input type="file" name="file1">
<input type="submit" value="上傳">
</form>
</body>
</html>
JSP頁面</pre><p>建立Servlet處理上傳</p><pre class='brush:php;toolbar:false;'>package com.load;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
@WebServlet("/uploadservlet1")
@MultipartConfig(location="")
public class uploadservlet1 extends HttpServlet {
private static final long serialVersionUID = 1L;
public uploadservlet1() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("utf-8");
//取得上傳文件，讀取文件
Part part = request.getPart("file1");
//定義一個變量去接收文件名
String filename = null;
//Content-Disposition: 就是當(dāng)用戶想把請求所得的內(nèi)容存為一個文件的時候提供一個默認(rèn)的文件名
//Content-Disposition：告訴瀏覽器以下載的方式打開文件
for (String content : part.getHeader("content-disposition").split(";")) {
System.out.println(content);
//取得文件名
if (content.trim().startsWith("filename")) {
//截取文件名
filename = content.substring(
content.indexOf('=') + 1).trim().replace("\"", "");
}
}
//輸出流
OutputStream out = null;
//輸入流
InputStream filecontent = null;
//File.separator 取得系統(tǒng)的分割線等數(shù)據(jù)
out = new FileOutputStream(new File("e:/loads" + File.separator + filename));
int read;
//獲得一個輸入流
filecontent = part.getInputStream();
final byte[] bytes = new byte[1024];
while ((read = filecontent.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
System.out.println("New file " + filename + " created at " + "/loads");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}</pre><p>(第三種上傳的方法)</p><p>這里使用的是jspSmartUpload包上傳下載，筆者認(rèn)為這種上傳下載較為簡單，但是好像不是很多人用，不懂，下載地址在這里(點(diǎn)我下載)</p><p>創(chuàng)建HTML頁面</p><pre class='brush:php;toolbar:false;'><!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>上傳文件</title>
</head>
<body>
<p> </p>
<p align="center">上傳文件選擇</p>
<form method="post" Action="../DouploadServlet" enctype="multipart/form-data">
<table width="75%" border="1" align="center">
<tr><td><div align="center">
1.<input type="file" name="file1" >
</div></td></tr>
<tr><td><div align="center">
2.<input type="file" name="file2" >
</div></td></tr>
<tr><td><div align="center">
3.<input type="file" name="file3" >
</div></td></tr>
<tr><td><div align="center">
<input type="submit" name="Submit" value="上傳他">
</div></td></tr>
</table>
</form>
</body>
</html></pre><p>創(chuàng)建Servlet處理上傳文件</p><pre class='brush:php;toolbar:false;'>package com.load;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;
import com.jspsmart.upload.File;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
@WebServlet("/DouploadServlet")
public class DouploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public DouploadServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
//新建一個智能上傳對象
SmartUpload su = new SmartUpload();
/*
* PageContext pageContext;
HttpSession session;
ServletContext application;
ServletConfig config;
JspWriter out;
Object page = this;
HttpServletRequest request,
HttpServletResponse response
其中page對象，request和response已經(jīng)完成了實例化，而其它5個沒有實例化的對象通過下面的方式實例化
pageContext = jspxFactory.getPageContext(this, request, response,null, true, 8192, true);
*/
//通過Jsp工廠類獲取上下文環(huán)境
PageContext pagecontext = JspFactory.getDefaultFactory().getPageContext(this, request, response, null, true, 8192, true);
//上傳初始化
su.initialize(pagecontext);
//上傳文件
try {
su.upload();
//將上傳文件保存到指定目錄
int count = su.save("/share");
out.println(count+"個文件上傳成功!<br>"+su.toString());
} catch (SmartUploadException e) {
e.printStackTrace();
}
//逐個提取上傳文件信息
for(int i=0;i<su.getFiles().getCount();i++){
File file = su.getFiles().getFile(i);
//如果文件不存在
if(file.isMissing()) continue;
//顯示當(dāng)前文件信息
out.println("<table border=1>");
out.println("<tr><td>表單項名(FieldName)</td></td>"+file.getFieldName()+"</td></tr>");
out.println("<tr><td>文件長度</td><td>"+file.getSize()+"</td></tr>");
out.println("<tr><td>文件名</td><td>"+file.getFileName()+"</td></tr>");
out.println("<tr><td>文件擴(kuò)展名</td><td>"+file.getFileExt()+"</td></tr>");
out.println("<tr><td>文件全名</td><td>"+file.getFilePathName()+"</td></tr>");
out.println("</table><br>");
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}</pre><p>3、實現(xiàn)文件下載</p><p>(第一種文件下載)</p><p>注意：該代碼是直接訪問Servlet類的</p><pre class='brush:php;toolbar:false;'>package com.load;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//直接使用Http://localhost:8080/Test1/download進(jìn)行下載，但是這個有缺陷，如果下載文件名中有中文，就會變成亂碼現(xiàn)象！
@WebServlet("/download")
public class download extends HttpServlet {
private static final long serialVersionUID = 1L;
public download() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/plain;charset=utf-8");
response.setCharacterEncoding("utf-8");
response.setHeader("Location","中文.txt");
response.setHeader("Content-Disposition", "attachment; filename=" + "賬號.txt");
OutputStream outputStream = response.getOutputStream();
InputStream inputStream = new FileInputStream("E:/loads"+"/賬號.txt");
byte[] buffer = new byte[1024];
int i = -1;
while ((i = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, i);
}
outputStream.flush();
outputStream.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}</pre><p>(第二種下載方法)</p><p>新建jsp頁面選擇下載</p><pre class='brush:php;toolbar:false;'><%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>下載</title>
</head>
<body>
<a href="../DoDownloadServlet?filename=呵呵.txt">點(diǎn)擊下載</a>
</body>
</html>
Jsp頁面代碼</pre><p>創(chuàng)建Servlet類進(jìn)行下載（注意：該下載如果文件名是中文的話，一樣會出現(xiàn)亂碼現(xiàn)象）</p><pre class='brush:php;toolbar:false;'>package com.load;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;
import org.hsqldb.lib.StringUtil;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
@WebServlet("/DoDownloadServlet")
public class DoDownloadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public DoDownloadServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//得到下載文件的名稱
//String filename = request.getParameter("filename");
//String filename = new String(FileName.getBytes("iso8859-1"),"UTF-8");
//新建SmartUpload對象
SmartUpload su = new SmartUpload();
PageContext pagecontext = JspFactory.getDefaultFactory().getPageContext(this, request, response, null, true, 8192, true);
//上傳初始化
su.initialize(pagecontext);
//設(shè)置禁止打開該文件
su.setContentDisposition(null);
//下載文件
try {
su.downloadFile("/listener/"+filename);
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}</pre><p>(第三種下載的方法)</p><p>同上的jsp頁面代碼，這里就不再重復(fù)了。</p><p>新建Serlvet類，實現(xiàn)下載功能（注意：這里文件名就算是中文名，也不會出現(xiàn)亂碼問題了?。?/p><pre class='brush:php;toolbar:false;'>package com.load;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;
import org.hsqldb.lib.StringUtil;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
@WebServlet("/DoDownloadServlet")
public class DoDownloadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public DoDownloadServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//獲得文件名稱
String path1 = request.getParameter("filename");
//獲得路徑名稱
String path = request.getSession().getServletContext().getRealPath("/listener/"+path1);
// path是根據(jù)日志路徑和文件名拼接出來的
File file = new File(path);
String filename = file.getName();
try {
//判斷是否是IE11
Boolean flag= request.getHeader("User-Agent").indexOf("like Gecko")>0;
//IE11 User-Agent字符串:Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko
//IE6~IE10版本的User-Agent字符串:Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.0; Trident/6.0)
if (request.getHeader("User-Agent").toLowerCase().indexOf("msie") >0||flag){
filename = URLEncoder.encode(filename, "UTF-8");//IE瀏覽器
}else {
//先去掉文件名稱中的空格,然后轉(zhuǎn)換編碼格式為utf-8,保證不出現(xiàn)亂碼,
//這個文件名稱用于瀏覽器的下載框中自動顯示的文件名
filename = new String(filename.replaceAll(" ", "").getBytes("UTF-8"), "ISO8859-1");
//firefox瀏覽器
//firefox瀏覽器User-Agent字符串:
//Mozilla/5.0 (Windows NT 6.1; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0
} InputStream fis = new BufferedInputStream(new FileInputStream(path));
byte[] buffer;
buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
response.reset();
response.addHeader("Content-Disposition", "attachment;filename=" +filename);
response.addHeader("Content-Length", "" + file.length());
OutputStream os = response.getOutputStream();
response.setContentType("application/octet-stream");
os.write(buffer);// 輸出文件
os.flush();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(filename);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}</pre><p><br></p>
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