这篇文章给大家分享的是有关Java实现文件上传的方法有哪些的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
一. uploadify：
uploadify控件的scripts和styles在这里：图片上传
JSP：
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ include file="../jsp/include/taglibs.jsp"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Upload</title> <script src="<c:url value="/scripts/jquery-1.8.3.min.js"/>" type="text/javascript"></script> <script type="text/javascript" src="<c:url value="/scripts/jquery-admin/jquery-ui.js" />"></script> <script type="text/javascript" src="<c:url value="/scripts/jquery-admin/component.js" />"></script> <script type="text/javascript" src="<c:url value="/scripts/jquery-admin/jquery-validate.js" />"></script> <script type="text/javascript" src="<c:url value="/scripts/jquery-admin/jquery-form.js" />"></script> <script type="text/javascript"src="<c:url value="/scripts/jquery-admin/init.js" />"></script> <script type="text/javascript"src="<c:url value="/scripts/jquery-admin/jquery.ui.datepicker-zh-CN.js" />"></script> <link rel="stylesheet" href="<c:url value='/styles/admin/admin1.css'/>" rel="external nofollow" > <link href="<c:url value=" rel="external nofollow" rel="external nofollow" /styles/jquery-ui/jquery-ui.css" />" rel="stylesheet" type="text/css" /> <script src="<c:url value="/scripts/jquery-uploadify/jquery.uploadify.min.js"/>" type="text/javascript"></script> <link rel="stylesheet" type="text/css" href="<c:url value=" rel="external nofollow" rel="external nofollow" /scripts/jquery-uploadify/uploadify.css"/>"> <style type="text/css"> #jidAttachTable {width:400px;font-size:14px;border:1px solid #d3d3d3;border-left-width:0;border-top-width:0;} #jidAttachTable td{border: 1px solid #d3d3d3;text-align:left;padding:5px;border-right-width:0;border-bottom-width:0;} #jidAttachTable .i-i-title{width:450px;} #jidAttachTable .i-i-content{width:100px;} </style> <script type="text/javascript"> $(function(){ //视频上传 var uploadVideo = $('#file_upload_video').uploadify({ 'buttonText':'上传视频', 'multi': false, 'fileTypeDesc': '请选择wmv视频文件', 'fileTypeExt': '*.wmv', 'swf' : '<c:url value="/scripts/jquery-uploadify/uploadify.swf"/>"', 'uploader' : '<c:url value="/uploadAttach.do"/>' , 'onUploadError': uploadVideoUploadError, 'onUploadSuccess':uploadVideoUploadSuccess }); function uploadVideoUploadError(){ alert("上传视频发生错误"); } function uploadVideoUploadSuccess(file, data, response){ var strs_ = data.split("@"); var videoName_ = strs_[0]; var videoPath_ = strs_[1]; $("#vidioPreview").val("/upload/" + videoPath_); } var arrAttach = new Array(); //将现有的附件加载到临时数组中 var nowAttachIds_ = "${attachs}"; //初始化现有的附件 if(nowAttachIds_ != null && nowAttachIds_ != ""){ var ids_ = nowAttachIds_.split("@") ; var i = 0; for( ; i < ids_.length ; i++){ arrAttach.push(ids_[i]); } } //附件上传 var uploadAttach = $('#file_upload_attach').uploadify({ 'buttonText':'上传附件', 'multi': false, 'swf' : '<c:url value="/scripts/jquery-uploadify/uploadify.swf"/>"', 'uploader' : '<c:url value="/uploadAttach.do"/>', 'onUploadError': uploadAttachUploadError, 'onUploadSuccess':uploadAttachUploadSuccess }); function uploadAttachUploadError(){ alert("上传过程中发生错误,您可以尝试重复上传一次！") } function uploadAttachUploadSuccess(file, data, response){ var strs_ = data.split("@") ; var documnetId_ = strs_[0]; var fileName_ = strs_[1]; var attach_ = "<tr class=\"jsClassDeleteAttachButtonTR\"> " + " <td class='i-i-title'>" + fileName_ + "</td> " + " <td class='i-i-content'><button class=\"jsClassDeleteAttachButton\" dataAttach="+ documnetId_ +">删除</button></td>" + " </tr>"; arrAttach.push(documnetId_); $("#jidAttachTable").append(attach_); } $(".jsClassDeleteAttachButton").live("click",function(){ var data_ = $(this).attr("dataAttach"); var i_ = 0; for(;i_ < arrAttach.length; i_++){ if(data_ == arrAttach[i_]){ arrAttach.splice(i_,1); break; } } $(this).parent().parent().remove(); //alert(arrAttach) }); }); var videotag = ""; $(function() { $("#PreviewDiv").dialog({ title: "视频预览", autoOpen: false, modal: true, resizable: false, position : "center", width: "489px", buttons: { "关闭": function() { $("#PreviewDiv").dialog("close"); } } }); $( "#PreviewDiv" ).on( "dialogopen", function( event, ui ) { $("#PreviewDiv").html(videotag); } ); $( "#PreviewDiv" ).on( "dialogclose", function( event, ui ) { $("#PreviewDiv").html(""); } ); }); var video_root_path = "http://localhost:8080/ProjectTest/"; function openDownloadFrame() { var _storePreview= video_root_path + $("#vidioPreview").val(); var _embed_head = '<EMBED src=\"'; var _embed_tail = '\" width=\"450\" height=\"400\" type=\"audio/x-wav\" loop=\"false\" autostart=\"true\">' + '</EMBED>'; videotag = _embed_head + _storePreview + _embed_tail; $("#PreviewDiv").dialog("open"); } </script> </head> <body> <form:form id="form" name="basedata" modelAttribute="basedata" action="update.do" method="post" > <div > <div > <input id="file_upload_video" name="file_upload_video" type="file" multiple="true"> </div> <div > <input id="vidioPreview" type="text" name="${bad.attributeStore}" value="${basedata[storeName]}"/> <input onclick="openDownloadFrame();" type="button" name="button" value="预览"> </div> </div> <div id='divContext' > <div > <input id="file_upload_attach" name="file_upload_attach" type="file" multiple="true"> </div> <div class="i-attachContainer"> <table id="jidAttachTable"> <c:forEach items="${attachList}" var="attach"> <tr class="jsClassDeleteAttachButtonTR"> <td class='i-i-title'>${attach.name}</td> <td class='i-i-content'> <button class="jsClassDeleteAttachButton" dataAttach="${attach.id}">删除</button> </td> </tr> </c:forEach> </table> </div> </div> <div id="PreviewDiv"> </div> </form:form> </body> </html>后台Java：
package com.sun.fileUpload; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Date; import java.util.Iterator; import java.util.LinkedList; import java.util.List; 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; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; @Controller public class upload{ // 附件上传 @RequestMapping("/uploadAttach.do") public void attachUpload(ModelMap modelMap,HttpServletRequest request ,HttpServletResponse response) throws IOException { System.out.println("upload file .... start"); String savePath = request.getSession().getServletContext().getRealPath("/") + "upload"; System.out.println("store path is :" + savePath); File f1 = new File(savePath); if (!f1.exists()) { f1.mkdirs(); } DiskFileItemFactory fac = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(fac); upload.setHeaderEncoding("utf-8"); List<FileItem> fileList = null; try { fileList = upload.parseRequest(request); } catch (FileUploadException ex) { ex.printStackTrace(); return; } Iterator<FileItem> it = fileList.iterator(); String name = ""; System.out.println("deal the files ... start"); //存储完毕保存进入数据库 //Document document = null; while (it.hasNext()) { FileItem item = it.next(); if (!item.isFormField()) { name = item.getName(); long size = item.getSize(); String type = item.getContentType(); if (name == null || name.trim().equals("")) { continue; } System.out.println("dealing file info:" + "fileName" + name + " size" + size + " type:" + type); //扩展名格式： if (name.lastIndexOf(".") >= 0) { name.substring(name.lastIndexOf(".")); } //存文件到磁盘指定路径 且存储文件记录存入数据库，如果存储发生故障，数据库记录也会创建失败 System.out.println(new Date() + "persist id :" + name); File saveFile = new File(savePath + "/" + name); try { item.write(saveFile); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(new Date() + "store file error"); } } } System.out.println("deal the files end"); System.out.println("upload file .... end"); response.getWriter().print(name + "@" + name); } }这里把数据库更新给省略了，有需要可以自己添加。
除上传外，其他实现功能：
1. 视频上传后的预览功能
2. 视频是单文件上传，附件是多文件上传和删除
二. Spring默认的上传功能：
JSP：
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ include file="../jsp/include/taglibs.jsp"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Upload</title> <script src="<c:url value="/scripts/jquery-1.8.3.min.js"/>" type="text/javascript"></script> <script type="text/javascript" src="<c:url value="/scripts/jquery-admin/jquery-ui.js" />"></script> <link rel="stylesheet" href="<c:url value='/styles/admin/ace.css'/>" rel="external nofollow" > <style type="text/css"> .file { position: relative; display: inline-block; background: #428BCA; border: 1px solid #99D3F5; border-radius: 4px; padding: 4px 12px; overflow: hidden; color: #000000; text-decoration: none; text-indent: 0; line-height: 20px; } .file:link { color: white; text-decoration:none; } .file input { position: absolute; font-size: 100px; right: 0; top: 0; opacity: 0; } .file:hover { background: #1B6AAA; border-color: #78C3F3; color: white; text-decoration: none; } </style> </head> <body> <form:form id="fileUploadForm" method="post" action="uploadFile.do" name="uploadfile" modelAttribute="uploadfile" enctype="multipart/form-data"> 点击保存后上传: <a href="javascript:;" rel="external nofollow" class="file">选择文件 <input type="file" name="videoFile" id="videoFile"> </a> <input type="text" id="resourceUrl-field" name="resourceUrl" placeholder="资源地址" class="col-sm-12" value="${uploadfile}"/> <input type="submit" value="保存" class="btn btn-sm btn-primary"> </form:form> </body> </html>后台Java：
package com.sun.fileUpload; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Date; import java.util.Iterator; import java.util.LinkedList; import java.util.List; 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; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; @Controller public class upload{ @RequestMapping(value = "/uploadFile.do") public String uploadController(HttpServletRequest request,ModelMap modelMap, @RequestParam("videoFile") MultipartFile videoFile) throws IllegalStateException, IOException{ String savePath = request.getSession().getServletContext().getRealPath("/") + "upload"; try { uploadSingleFile(savePath, videoFile, request.getSession().getServletContext().getRealPath("/")); }catch (Exception e) { return "/upload"; } modelMap.addAttribute("uploadfile", "upload/" + videoFile.getOriginalFilename()); return "/upload"; } public static String uploadSingleFile(String path, MultipartFile file, String rootPath) { if (!file.isEmpty()) { byte[] bytes; try { bytes = file.getBytes(); // Create the file on server File serverFile = new File(path + "/" + file.getOriginalFilename()); BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(serverFile)); stream.write(bytes); stream.close(); System.out.println("Server File Location=" + serverFile.getAbsolutePath()); return getRelativePathFromUploadDir(serverFile, rootPath).replaceAll("\\\\", "/"); } catch (IOException e) { e.printStackTrace(); } }else{ System.out.println("文件内容为空"); } return null; } public static String getRelativePathFromUploadDir(File file, String rootPath){ if(null==file) return ""; String absolutePath = file.getAbsolutePath(); if(absolutePath.indexOf(rootPath)!=-1 && rootPath.length()<absolutePath.length()) return absolutePath.substring(absolutePath.indexOf(rootPath)+rootPath.length()); else return ""; } }Spring配置文件springmvc-servlet.xml中添加：
<bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”> <property name=”defaultEncoding” value=”UTF-8″ /> </bean>如果和uploadify同时使用的话，需要做一些修改，否则uploadify的上传文件会被Spring拦截：
<!-- 支持上传文件 --> lt;bean id="multipartResolver" class="org.sun.com.MyMultipartResolver"> <!--设置上传文件的编码格式，用于解决上传的文件中文名乱码问题 --> <property name="defaultEncoding"> <value>UTF-8</value> </property> <property name="excludeUrls" value="/uploadAttach.do,/uploadVideo.do"/> lt;/bean>org.sun.com.MyMultipartResolver：
package org.sun.com; import javax.servlet.http.HttpServletRequest; import org.springframework.web.multipart.commons.CommonsMultipartResolver; public class MyMultipartResolver extends CommonsMultipartResolver { private String excludeUrls; private String[] excludeUrlArray; public String getExcludeUrls() { return excludeUrls; } public void setExcludeUrls(String excludeUrls) { this.excludeUrls = excludeUrls; this.excludeUrlArray = excludeUrls.split(","); } @Override public boolean isMultipart(HttpServletRequest request) { for (String url: excludeUrlArray) { // 这里可以自己换判断 if (request.getRequestURI().contains(url)) { return false; } } return super.isMultipart(request); } }感谢各位的阅读！关于“Java实现文件上传的方法有哪些”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧！
