message.jsp的代碼如下：<\/p>
<%@ page language=\"java\" pageEncoding=\"UTF-8\"%>\n\n\n \n消息提示<\/title>\n <\/head>\n \n <body> <h1><a href="http://ipnx.cn/">亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱</a></h1>\n ${message}\n <\/body>\n<\/html><\/pre><p>2.2、處理文件上傳的Servlet<\/p><p>UploadHandleServlet的代碼如下：<\/p><pre class='brush:php;toolbar:false;'>package me.gacl.web.controller;\n\nimport java.io.File;\nimport java.io.FileOutputStream;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.List;\nimport javax.servlet.ServletException;\nimport javax.servlet.http.HttpServlet;\nimport javax.servlet.http.HttpServletRequest;\nimport javax.servlet.http.HttpServletResponse;\nimport org.apache.commons.fileupload.FileItem;\nimport org.apache.commons.fileupload.disk.DiskFileItemFactory;\nimport org.apache.commons.fileupload.servlet.ServletFileUpload;\n\npublic class UploadHandleServlet extends HttpServlet {\n\n public void doGet(HttpServletRequest request, HttpServletResponse response)\n throws ServletException, IOException {\n \/\/得到上傳文件的保存目錄，將上傳的文件存放于WEB-INF目錄下，不允許外界直接訪問，保證上傳文件的安全\n String savePath = this.getServletContext().getRealPath(\"\/WEB-INF\/upload\");\n File file = new File(savePath);\n \/\/判斷上傳文件的保存目錄是否存在\n if (!file.exists() && !file.isDirectory()) {\n System.out.println(savePath+\"目錄不存在，需要創(chuàng)建\");\n \/\/創(chuàng)建目錄\n file.mkdir();\n }\n \/\/消息提示\n String message = \"\";\n try{\n \/\/使用Apache文件上傳組件處理文件上傳步驟：\n \/\/1、創(chuàng)建一個DiskFileItemFactory工廠\n DiskFileItemFactory factory = new DiskFileItemFactory();\n \/\/2、創(chuàng)建一個文件上傳解析器\n ServletFileUpload upload = new ServletFileUpload(factory);\n \/\/解決上傳文件名的中文亂碼\n upload.setHeaderEncoding(\"UTF-8\"); \n \/\/3、判斷提交上來的數(shù)據(jù)是否是上傳表單的數(shù)據(jù)\n if(!ServletFileUpload.isMultipartContent(request)){\n \/\/按照傳統(tǒng)方式獲取數(shù)據(jù)\n return;\n }\n \/\/4、使用ServletFileUpload解析器解析上傳數(shù)據(jù)，解析結(jié)果返回的是一個List<FileItem>集合，每一個FileItem對應一個Form表單的輸入項\n List<FileItem> list = upload.parseRequest(request);\n for(FileItem item : list){\n \/\/如果fileitem中封裝的是普通輸入項的數(shù)據(jù)\n if(item.isFormField()){\n String name = item.getFieldName();\n \/\/解決普通輸入項的數(shù)據(jù)的中文亂碼問題\n String value = item.getString(\"UTF-8\");\n \/\/value = new String(value.getBytes(\"iso8859-1\"),\"UTF-8\");\n System.out.println(name + \"=\" + value);\n }else{\/\/如果fileitem中封裝的是上傳文件\n \/\/得到上傳的文件名稱，\n String filename = item.getName();\n System.out.println(filename);\n if(filename==null || filename.trim().equals(\"\")){\n continue;\n }\n \/\/注意：不同的瀏覽器提交的文件名是不一樣的，有些瀏覽器提交上來的文件名是帶有路徑的，如： c:\\a\\b\\1.txt，而有些只是單純的文件名，如：1.txt\n \/\/處理獲取到的上傳文件的文件名的路徑部分，只保留文件名部分\n filename = filename.substring(filename.lastIndexOf(\"\\\\\")+1);\n \/\/獲取item中的上傳文件的輸入流\n InputStream in = item.getInputStream();\n \/\/創(chuàng)建一個文件輸出流\n FileOutputStream out = new FileOutputStream(savePath + \"\\\\\" + filename);\n \/\/創(chuàng)建一個緩沖區(qū)\n byte buffer[] = new byte[1024];\n \/\/判斷輸入流中的數(shù)據(jù)是否已經(jīng)讀完的標識\n int len = 0;\n \/\/循環(huán)將輸入流讀入到緩沖區(qū)當中，(len=in.read(buffer))>0就表示in里面還有數(shù)據(jù)\n while((len=in.read(buffer))>0){\n \/\/使用FileOutputStream輸出流將緩沖區(qū)的數(shù)據(jù)寫入到指定的目錄(savePath + \"\\\\\" + filename)當中\(zhòng)n out.write(buffer, 0, len);\n }\n \/\/關(guān)閉輸入流\n in.close();\n \/\/關(guān)閉輸出流\n out.close();\n \/\/刪除處理文件上傳時生成的臨時文件\n item.delete();\n message = \"文件上傳成功！\";\n }\n }\n }catch (Exception e) {\n message= \"文件上傳失??！\";\n e.printStackTrace();\n \n }\n request.setAttribute(\"message\",message);\n request.getRequestDispatcher(\"\/message.jsp\").forward(request, response);\n }\n\n public void doPost(HttpServletRequest request, HttpServletResponse response)\n throws ServletException, IOException {\n\n doGet(request, response);\n }\n}<\/pre><p>在Web.xml文件中注冊UploadHandleServlet<\/p><pre class='brush:php;toolbar:false;'><servlet>\n <servlet-name>UploadHandleServlet<\/servlet-name>\n 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</div> <div id="wjcelcm34c" class="Articlelist_txts"> <div id="wjcelcm34c" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">java怎麼上傳文件</h1> <div id="wjcelcm34c" class="Articlelist_txts_info_head"> <div id="wjcelcm34c" class="author_info"> <a href="http://ipnx.cn/zh-tw/member/490068.html" class="author_avatar"> <img class="lazy" data-src="https://img.php.cn/upload/avatar/000/490/068/5d2bd4ed95560268.jpeg" src="/static/imghw/default1.png" alt="angryTom"> </a> <div id="wjcelcm34c" class="author_detail"> <a href="http://ipnx.cn/zh-tw/member/490068.html" class="author_name">angryTom</a> </div> </div> </div> <span id="wjcelcm34c" class="Articlelist_txts_time">Nov 12, 2019 am 11:57 AM</span> <div id="wjcelcm34c" class="Articlelist_txts_infos"> <span id="wjcelcm34c" class="Articlelist_txts_infoss on">java</span> <span id="wjcelcm34c" class="Articlelist_txts_infoss ">上傳文件</span> </div> </div> </div> <hr /> <div id="wjcelcm34c" class="article_main php-article"> <div id="wjcelcm34c" 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" data-ad-slot="3461856641"> </ins> <p>在Web應用系統(tǒng)開發(fā)中，文件上傳和下載功能是非常常用的功能，今天來講一下JavaWeb中的文件上傳功能的實現(xiàn)。</p> <p style="text-align: center;"><strong><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/040/5dca2bf78a2aa477.jpg" class="lazy" alt="java怎麼上傳文件" ></strong></p> <p><strong>java怎么上傳文件</strong></p> <p>對于文件上傳，瀏覽器在上傳的過程中是將文件以流的形式提交到服務器端的，如果直接使用Servlet獲取上傳文件的輸入流然后再解析里面的請求參數(shù)是比較麻煩，所以一般選擇采用apache的開源工具common-fileupload這個文件上傳組件。這個common-fileupload上傳組件的jar包可以去apache官網(wǎng)上面下載，也可以在struts的lib文件夾下面找到，struts上傳的功能就是基于這個實現(xiàn)的。common-fileupload是依賴于common-io這個包的，所以還需要下載這個包。（推薦教程：<a href="http://ipnx.cn/java-article.html" target="_blank">java教程</a>）</p> <p><strong>一、開發(fā)環(huán)境搭建</strong></p> <p>創(chuàng)建一個FileUploadAndDownLoad項目，加入Apache的commons-fileupload文件上傳組件的相關(guān)Jar包，如下圖所示：</p> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/722/419/214/1573530528206424.jpg" class="lazy" title="1573530528206424.jpg" alt="java怎麼上傳文件"></p> <p><strong>二、實現(xiàn)文件上傳</strong></p> <p>2.1、文件上傳頁面和消息提示頁面</p> <p>upload.jsp頁面的代碼如下：</p><pre class='brush:php;toolbar:false;'><%@ page language="java" pageEncoding="UTF-8"%> <!DOCTYPE HTML> <html> <head> <title>文件上傳</title> </head> <body> <form action="${pageContext.request.contextPath}/servlet/UploadHandleServlet" enctype="multipart/form-data" method="post"> 上傳用戶：<input type="text" name="username"><br/> 上傳文件1：<input type="file" name="file1"><br/> 上傳文件2：<input type="file" name="file2"><br/> <input type="submit" value="提交"> </form> </body> </html></pre><p>message.jsp的代碼如下：</p><pre class='brush:php;toolbar:false;'><%@ page language="java" pageEncoding="UTF-8"%> <!DOCTYPE HTML> <html> <head> <title>消息提示</title> </head> <body> ${message} </body> </html></pre><p>2.2、處理文件上傳的Servlet</p><p>UploadHandleServlet的代碼如下：</p><pre class='brush:php;toolbar:false;'>package me.gacl.web.controller; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; 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; public class UploadHandleServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //得到上傳文件的保存目錄，將上傳的文件存放于WEB-INF目錄下，不允許外界直接訪問，保證上傳文件的安全 String savePath = this.getServletContext().getRealPath("/WEB-INF/upload"); File file = new File(savePath); //判斷上傳文件的保存目錄是否存在 if (!file.exists() && !file.isDirectory()) { System.out.println(savePath+"目錄不存在，需要創(chuàng)建"); //創(chuàng)建目錄 file.mkdir(); } //消息提示 String message = ""; try{ //使用Apache文件上傳組件處理文件上傳步驟： //1、創(chuàng)建一個DiskFileItemFactory工廠 DiskFileItemFactory factory = new DiskFileItemFactory(); //2、創(chuàng)建一個文件上傳解析器 ServletFileUpload upload = new ServletFileUpload(factory); //解決上傳文件名的中文亂碼 upload.setHeaderEncoding("UTF-8"); //3、判斷提交上來的數(shù)據(jù)是否是上傳表單的數(shù)據(jù) if(!ServletFileUpload.isMultipartContent(request)){ //按照傳統(tǒng)方式獲取數(shù)據(jù) return; } //4、使用ServletFileUpload解析器解析上傳數(shù)據(jù)，解析結(jié)果返回的是一個List<FileItem>集合，每一個FileItem對應一個Form表單的輸入項 List<FileItem> list = upload.parseRequest(request); for(FileItem item : list){ //如果fileitem中封裝的是普通輸入項的數(shù)據(jù) if(item.isFormField()){ String name = item.getFieldName(); //解決普通輸入項的數(shù)據(jù)的中文亂碼問題 String value = item.getString("UTF-8"); //value = new String(value.getBytes("iso8859-1"),"UTF-8"); System.out.println(name + "=" + value); }else{//如果fileitem中封裝的是上傳文件 //得到上傳的文件名稱， String filename = item.getName(); System.out.println(filename); if(filename==null || filename.trim().equals("")){ continue; } //注意：不同的瀏覽器提交的文件名是不一樣的，有些瀏覽器提交上來的文件名是帶有路徑的，如： c:\a\b\1.txt，而有些只是單純的文件名，如：1.txt //處理獲取到的上傳文件的文件名的路徑部分，只保留文件名部分 filename = filename.substring(filename.lastIndexOf("\\")+1); //獲取item中的上傳文件的輸入流 InputStream in = item.getInputStream(); //創(chuàng)建一個文件輸出流 FileOutputStream out = new FileOutputStream(savePath + "\\" + filename); //創(chuàng)建一個緩沖區(qū) byte buffer[] = new byte[1024]; //判斷輸入流中的數(shù)據(jù)是否已經(jīng)讀完的標識 int len = 0; //循環(huán)將輸入流讀入到緩沖區(qū)當中，(len=in.read(buffer))>0就表示in里面還有數(shù)據(jù) while((len=in.read(buffer))>0){ //使用FileOutputStream輸出流將緩沖區(qū)的數(shù)據(jù)寫入到指定的目錄(savePath + "\\" + filename)當中 out.write(buffer, 0, len); } //關(guān)閉輸入流 in.close(); //關(guān)閉輸出流 out.close(); //刪除處理文件上傳時生成的臨時文件 item.delete(); message = "文件上傳成功！"; } } }catch (Exception e) { message= "文件上傳失?。?quot;; e.printStackTrace(); } request.setAttribute("message",message); request.getRequestDispatcher("/message.jsp").forward(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }</pre><p>在Web.xml文件中注冊UploadHandleServlet</p><pre class='brush:php;toolbar:false;'><servlet> <servlet-name>UploadHandleServlet</servlet-name> <servlet-class>me.gacl.web.controller.UploadHandleServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>UploadHandleServlet</servlet-name> <url-pattern>/servlet/UploadHandleServlet</url-pattern> </servlet-mapping></pre><p>文件上傳成功之后，上傳的文件保存在了WEB-INF目錄下的upload目錄，如下圖所示：</p> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/678/158/650/1573530602598078.jpg" class="lazy" title="1573530602598078.jpg" alt="java怎麼上傳文件"></p><p>以上是java怎麼上傳文件的詳細內(nèi)容。更多資訊請關(guān)注PHP中文網(wǎng)其他相關(guān)文章！</p> </div> </div> <div id="wjcelcm34c" class="wzconShengming_sp"> 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