介绍
通过本文，你可以学习到如何封装或者开发一个前端组件，同时学习Bootstrap-fileinput组件的使用，封装后使用更加简单方便。
BaseFile是AdminEAP框架中基于Bootstrap-fileinput的附件上传组件，它支持 支持多文件、在线预览、拖拽上传等功能，封装后BaseFile主要包括以下功能：
- 弹出窗口的附件上传
- 当前界面的附件上传
- 显示附件明细
- 可编辑的附件明细（删除、预览、不可新增）
关于Bootstrap-fileinput的API文档可参考http://plugins.krajee.com/file-input
本文源码已在AdminEAP框架（一个基于AdminLTE的Java开发平台）中开源，可在Github下载相关代码：
Github：https://github.com/bill1012/AdminEAP
AdminEAP官网：http://www.admineap.com
使用说明
1、初始化
如果需要在当前界面使用附件上传功能（非弹窗方式）则需要在头部引入相关的css和js文件
<link rel="stylesheet" href="./resources/common/libs/fileinput/css/fileinput.min.css">
<script src="./resources/common/libs/fileinput/js/fileinput.js"></script><script src="./resources/common/libs/fileinput/js/locales/zh.js"></script><script src="./resources/common/js/base-file.js"></script>
form表单上还需要配置enctype="multipart/form-data"属性
2、弹窗方式调用
BaseFile支持弹窗方式打开一个附件上传窗口，点击附件上传后，弹出窗口，上传附件关闭窗口后，上传的附件在type=file的控件回填。
在表单中点击弹窗上传附件：
上传完毕，关闭窗口，附件回填
再次打开上传附件上传窗口时，会把已有的附件回填到附件上传窗口。
配置如下：
<input type="hidden" name="fileIds" id="fileIds"> <div class="form-group"> <div class="btn btn-default btn-file" id="uploadFile"> <i class="fa fa-paperclip"></i> 上传附件(Max. 10MB) </div> </div> <div class="form-group" id="file_container"> <input type="file" name="file" id="attachment"> </div>
$("#uploadFile").file({ title: "请上传附件", fileinput: { maxFileSize: 10240, maxFileCount:3 }, fileIdContainer:"[name='fileIds']", showContainer:'#attachment', showType:'edit', window:true, callback:function(fileIds,oldfileIds){ this.showFiles({ fileIds:fileIds }); } });
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3、本地界面调用
本地界面调用附件上传，如下图所示：
将上传附件嵌入到当前界面方式
上传后的附件可删除、可预览
（目前图片文件可预览，其他文件不可预览，后期将集成txt/xml/html/pdf的预览功能）
配置如下：
<div class="form-group" id="file_container"> <input type="file" name="file" id="attachment"></div>
$("#attachment").file({ fileinput: { maxFileSize: 10240, maxFileCount:3 }, fileIdContainer:"[name='fileIds']", window:false });
4、控件参数说明
window 默认为true,弹窗方式打开
title window=true时配置，弹窗的标题，默认为“文件上传”
width window=true时配置，弹窗的宽度，默认900
winId window=true时配置，弹出的id，默认为fileWin
fileinput Bootstrap-fileinput的配置参数，会覆盖默认配置，比如允许上传哪种类型的附件allowedFileTypes，允许上传最大附件大小maxFileSize，允许上传附件的个数maxFileCount等，具体的配置参数可以查询Bootstrap-fileinput的API文档。
fileIdContainer 必须，上传后的附件id存储的位置，id以逗号分隔
showContainer window=true必须配置，文件上传后回填的区域，window=false时如不配置，则取base-file的初始对象
showType window=true配置，值为edit或者detail,edit表示回填后可对数据进行删除、预览，detail只能显示，不能删除
callback window=true配置，关闭附件上传的窗口后执行的回调函数（比如更新当前的文件列表），fileIds,oldfileIds两个参数分别是更新后文件ids和更新前的文件ids
BaseFile默认配置，BaseFile的更多实现，请查看BaseFile源码
BaseFile.prototype.default = { winId: "fileWin", width: 900, title: "文件上传", url: basePath + "/file/uploader", multiple: true, window:true, showType:"detail", fileinput: { language: 'zh', uploadUrl: basePath + "/file/uploadMultipleFile", deleteUrl:basePath+"/file/delete", uploadAsync:false, validateInitialCount:true, overwriteInitial: false, allowedPreviewTypes: ['image'], previewFileIcon:'<i class="fa fa-file-o"></i>', previewFileIconSettings: null, slugCallback: function (text) { var newtext=(!text||text=='') ? '' : String(text).replace(/[\-\[\]\/\{}:;#%=\(\)\*\+\?\\\^\$\|<>&"']/g, '_'); return newtext.replace(/(^\s+)|(\s+$)/g,"").replace(/\s/g,""); } } }
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5、BaseFile控件源码
(function ($, window, document, undefined) { 'use strict'; var pluginName = 'file'; $.fn[pluginName] = function (options) { var self = $(this); if (this == null) return null; var data = this.data(pluginName); if (!data) { data = new BaseFile(this, $.extend(true, {}, options)); self.data(pluginName, data); } }; var BaseFile = function (element, options) { this.element = element; options.container = options.container || this.element.selector.replace("#", ""); this.getFileIconSettings(); this.options = $.extend(true, {}, this.default, options); this.initFileIds(); if(this.options.window) { this.element.click(function () { $(this).data('file').openWin(); }); }else{ if(this.options.multiple) this.element.attr("multiple","multiple"); } if(this.hasDisplayZone()){ this.showFiles(); } } BaseFile.prototype.default = { winId: "fileWin", width: 900, title: "文件上传", url: basePath + "/file/uploader", multiple: true, window:true, showType:"detail", fileinput: { language: 'zh', uploadUrl: basePath + "/file/uploadMultipleFile", deleteUrl:basePath+"/file/delete", uploadAsync:false, validateInitialCount:true, overwriteInitial: false, allowedPreviewTypes: ['image'], previewFileIcon:'<i class="fa fa-file-o"></i>', previewFileIconSettings: null, slugCallback: function (text) { var newtext=(!text||text=='') ? '' : String(text).replace(/[\-\[\]\/\{}:;#%=\(\)\*\+\?\\\^\$\|<>&"']/g, '_'); return newtext.replace(/(^\s+)|(\s+$)/g,"").replace(/\s/g,""); } } } BaseFile.prototype.getFileInputConfig=function () { return this.options.fileinput; } BaseFile.prototype.getFileIconSettings = function () { var self = this; ajaxPost(basePath + "/file/icons", null, function (icons) { self.previewFileIconSettings = icons; }) } BaseFile.prototype.openWin = function () { var that = this; var self = $.extend(true, {}, this.options); delete self.callback; delete self.fileIds; delete self.showContainer; delete self.fileIdContainer; delete self.fileinput; modals.openWin({ winId: that.options.winId, url: that.options.url + "?config=" + JSON.stringify(self), width: that.options.width + "px", title: that.options.title, backdrop: "static" }); } BaseFile.prototype.callbackHandler = function (fileIds) { var oldfileIds = this.options.fileIds; this.options.fileIds = fileIds; this.updateFileIds(); if (this.options.callback) { this.options.callback.call(this, fileIds, oldfileIds); } } BaseFile.prototype.showFiles=function(options){ options=options||{}; if(!this.hasDisplayZone()){ modals.error("请配置showContainer属性，并在容器下配置type=file的input组件"); return; } var fileIds=options.fileIds||this.options.fileIds; if(!fileIds&&this.options.window){ $(this.options.showContainer).hide(); return; } $(this.options.showContainer).show(); var fileComponet=$(this.options.showContainer); var fileResult=this.getFileResult(fileIds),preview=fileResult.initialPreview,previewConfig=fileResult.initialPreviewConfig,self=this; var defaultConfig={ initialPreview:preview, initialPreviewConfig:previewConfig }; var config; if(this.options.window){ if(this.options.showType=="edit"){ config=$.extend({},self.options.fileinput,defaultConfig,{ showRemove:false, showUpload:false, showClose:false, showBrowse:false, showCaption:false },options); }else if(this.options.showType=="detail"){ config=$.extend({},self.options.fileinput,defaultConfig,{ showRemove:false, showUpload:false, showClose:false, showBrowse:false, showCaption:false, initialPreviewShowDelete:false },options); } }else{ config=$.extend({},self.options.fileinput,defaultConfig,{ showClose:false },options); } if(!config){ modals.error("未找到showFiles中的相关配置"); return; } fileComponet.fileinput('destroy'); fileComponet.fileinput(config).on("filedeleted",function (event,key) { var newfids=self.deleteFileIds(key,self.options.fileIds); self.options.fileIds=newfids; self.updateFileIds(); }).on("fileuploaded",function(event,data,previewId,index){ var newfids=self.addFileIds(data.response.fileIds,self.options.fileIds); self.options.fileIds=newfids; self.updateFileIds(); }).on("filebatchuploadsuccess",function (event,data,previewId,index) { var newfids=self.addFileIds(data.response.fileIds,self.options.fileIds); self.options.fileIds=newfids; self.updateFileIds(); }).on("filezoomhidden", function(event, params) { $(document.body).removeClass('modal-open'); $(document.body).css("padding-right","0px"); }); } BaseFile.prototype.deleteFileIds=function(fileIds,targetIds){ if(!fileIds) return targetIds; if(!targetIds){ modals.error("没有要删除的文件，请检查是否数据没有初始化"); return; } var fileIdArr=fileIds.split(","); var fresult=targetIds.split(","); $.each(fileIdArr,function (index,fileId){ if($.inArray(fileId,fresult)>-1){ fresult.splice($.inArray(fileId,fresult),1); } }) return fresult.join(); } BaseFile.prototype.addFileIds=function (fileIds,targetIds) { if(!fileIds)return targetIds; var fileIdArr=fileIds.split(","); var fresult=[]; if(targetIds){ fresult=targetIds.split(","); } $.each(fileIdArr,function (index,fileId){ if($.inArray(fileId,fresult)==-1){ fresult.push(fileId); } }) return fresult.join(); } BaseFile.prototype.updateFileIds=function(){ if(this.options.fileIdContainer) $(this.options.fileIdContainer).val(this.options.fileIds); } BaseFile.prototype.initFileIds=function(){ if(!this.options.window){ if(!this.options.fileIdContainer||!$(this.options.fileIdContainer)){ modals.info("请设置fileIdContainer属性"); return; } } if(!this.options.fileIds){ if(this.options.fileIdContainer){ this.options.fileIds=$(this.options.fileIdContainer).val(); } } } BaseFile.prototype.getFileResult=function(fileIds){ var ret=null; ajaxPost(basePath+"/file/getFiles",{fileIds:fileIds},function(result){ ret=result; }); return ret; }; BaseFile.prototype.hasDisplayZone=function(){ if(!this.options.showContainer){ this.options.showContainer=this.element.selector; } if(!this.options.showContainer||!$(this.options.showContainer)){ return false; } return true; }})(jQuery, window, document);
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6、后端源码
@Controller@RequestMapping("/file")public class UploaderController { private static Logger logger= LoggerFactory.getLogger(UploaderController.class); public static Map fileIconMap=new HashMap(); @Resource private UploaderService uploaderService; static { fileIconMap.put("doc" ,"<i class='fa fa-file-word-o text-primary'></i>"); fileIconMap.put("docx","<i class='fa fa-file-word-o text-primary'></i>"); fileIconMap.put("xls" ,"<i class='fa fa-file-excel-o text-success'></i>"); fileIconMap.put("xlsx","<i class='fa fa-file-excel-o text-success'></i>"); fileIconMap.put("ppt" ,"<i class='fa fa-file-powerpoint-o text-danger'></i>"); fileIconMap.put("pptx","<i class='fa fa-file-powerpoint-o text-danger'></i>"); fileIconMap.put("jpg" ,"<i class='fa fa-file-photo-o text-warning'></i>"); fileIconMap.put("pdf" ,"<i class='fa fa-file-pdf-o text-danger'></i>"); fileIconMap.put("zip" ,"<i class='fa fa-file-archive-o text-muted'></i>"); fileIconMap.put("rar" ,"<i class='fa fa-file-archive-o text-muted'></i>"); fileIconMap.put("default" ,"<i class='fa fa-file-o'></i>"); } private static final String uploaderPath=PropertiesUtil.getValue("uploaderPath"); /** * 跳转到通用文件上传窗口 * @return */ @RequestMapping(value="/uploader",method = RequestMethod.GET) public String uploader(String config,HttpServletRequest request){ request.setAttribute("config",config); return "base/file/file_uploader"; } /** * 通用文件上传接口，存储到固定地址，以后存储到文件服务器地址 */ @RequestMapping(value = "/uploadFile", method = RequestMethod.POST) @ResponseBody public SysFile uploadFile(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, HttpServletResponse response) { return new SysFile(); } /** * 多文件上传，用于uploadAsync=false(同步多文件上传使用) * @param files * @param request * @param response * @return */ @RequestMapping(value = "/uploadMultipleFile", method = RequestMethod.POST) @ResponseBody public FileResult uploadMultipleFile(@RequestParam(value = "file", required = false) MultipartFile[] files, HttpServletRequest request, HttpServletResponse response) throws IOException { System.out.println("the num of file:"+files.length); FileResult msg = new FileResult(); ArrayList<Integer> arr = new ArrayList<>(); List<SysFile> fileList=new ArrayList<>(); String dirPath = request.getRealPath("/"); for (int i = 0; i < files.length; i++) { MultipartFile file = files[i]; if (!file.isEmpty()) { InputStream in = null; OutputStream out = null; try { File dir = new File(dirPath+uploaderPath); if (!dir.exists()) dir.mkdirs(); String filePrefixFormat="yyyyMMddHHmmssS"; System.out.println(DateUtil.format(new Date(),filePrefixFormat)); String savedName=DateUtil.format(new Date(),filePrefixFormat)+"_"+file.getOriginalFilename(); String filePath=dir.getAbsolutePath() + File.separator + savedName; File serverFile = new File(filePath); file.transferTo(serverFile); SysFile sysFile=new SysFile(); sysFile.setFileName(file.getOriginalFilename()); sysFile.setSavedName(savedName); sysFile.setCreateDateTime(new Date()); sysFile.setUpdateDateTime(new Date()); sysFile.setCreateUserId(SecurityUtil.getUserId()); sysFile.setDeleted(0); sysFile.setFileSize(file.getSize()); sysFile.setFilePath(uploaderPath+File.separator+savedName); uploaderService.save(sysFile); fileList.add(sysFile); logger.info("Server File Location=" + serverFile.getAbsolutePath()); } catch (Exception e) { logger.error( file.getOriginalFilename()+"上传发生异常，异常原因："+e.getMessage()); arr.add(i); } finally { if (out != null) { out.close(); } if (in != null) { in.close(); } } } else { arr.add(i); } } if(arr.size() > 0) { msg.setError("文件上传失败！"); msg.setErrorkeys(arr); } FileResult preview=getPreivewSettings(fileList,request); msg.setInitialPreview(preview.getInitialPreview()); msg.setInitialPreviewConfig(preview.getInitialPreviewConfig()); msg.setFileIds(preview.getFileIds()); return msg; } @RequestMapping(value="/delete",method = RequestMethod.POST) @ResponseBody public Result delete(String id,HttpServletRequest request){ SysFile sysFile=uploaderService.get(SysFile.class,id); String dirPath=request.getRealPath("/"); FileUtil.delFile(dirPath+uploaderPath+File.separator+sysFile.getSavedName()); uploaderService.delete(sysFile); return new Result(); } /** * 获取字体图标map,base-file控件使用 */ @RequestMapping(value="/icons",method = RequestMethod.POST) @ResponseBody public Map getIcons(){ return fileIconMap; } /** * 根据文件名获取icon * @param fileName 文件 * @return */ public String getFileIcon(String fileName){ String ext= StrUtil.getExtName(fileName); return fileIconMap.get(ext)==null?fileIconMap.get("default").toString():fileIconMap.get(ext).toString(); } /** * 根据附件IDS 获取文件 * @param fileIds * @param request * @return */ @RequestMapping(value="/getFiles",method = RequestMethod.POST) @ResponseBody public FileResult getFiles(String fileIds,HttpServletRequest request){ String[] fileIdArr=fileIds.split(","); DetachedCriteria criteria=DetachedCriteria.forClass(SysFile.class); criteria.add(Restrictions.in("id",fileIdArr)); criteria.addOrder(Order.asc("createDateTime")); List<SysFile> fileList=uploaderService.findByCriteria(criteria); return getPreivewSettings(fileList,request); } /** * 回填已有文件的缩略图 * @param fileList 文件列表 * @param request * @return initialPreiview initialPreviewConfig fileIds */ public FileResult getPreivewSettings(List<SysFile> fileList,HttpServletRequest request){ FileResult fileResult=new FileResult(); List<String> previews=new ArrayList<>(); List<FileResult.PreviewConfig> previewConfigs=new ArrayList<>(); String dirPath = request.getRealPath("/"); String[] fileArr=new String[fileList.size()]; int index=0; for (SysFile sysFile : fileList) { if(FileUtil.isImage(dirPath+uploaderPath+File.separator+sysFile.getSavedName())) { previews.add("<img src='." + sysFile.getFilePath().replace(File.separator, "/") + "' class='file-preview-image kv-preview-data' " + "style='width:auto;height:160px' alt='" + sysFile.getFileName() + " title='" + sysFile.getFileName() + "''>"); }else{ previews.add("<div class='kv-preview-data file-preview-other-frame'><div class='file-preview-other'>" + "<span class='file-other-icon'>"+getFileIcon(sysFile.getFileName())+"</span></div></div>"); } FileResult.PreviewConfig previewConfig=new FileResult.PreviewConfig(); previewConfig.setWidth("120px"); previewConfig.setCaption(sysFile.getFileName()); previewConfig.setKey(sysFile.getId()); previewConfig.setExtra(new FileResult.PreviewConfig.Extra(sysFile.getId())); previewConfig.setSize(sysFile.getFileSize()); previewConfigs.add(previewConfig); fileArr[index++]=sysFile.getId(); } fileResult.setInitialPreview(previews); fileResult.setInitialPreviewConfig(previewConfigs); fileResult.setFileIds(StrUtil.join(fileArr)); return fileResult; }}
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总结
本文源码已在AdminEAP框架（一个基于AdminLTE的Java开发平台）中开源，可在Github下载相关代码：
Github：https://github.com/bill1012/AdminEAP
AdminEAP官网：http://www.admineap.com
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