web前端|html教程
html,上传,页面
web前端-html教程
html页面：
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本功能实现图片上传并显示，点击“查看”按钮也显示图片
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@ if (!isEmpty(news.thumbnail_atta_id)) {
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@ }
上传...
js代码：
//缩略图文件上传$(#fileupload).fileupload({dataType: json,add: function(e, data) {var acceptFileTypes = /(\.|\/)(gif|jpe?g|png)$/i;if(data.originalFiles[0][ ype].length && !acceptFileTypes.test(data.originalFiles[0][ ype])) {alert(请上传图片格式的文件！)} else {data.submit();}},done: function (e, data) {$(#thumbnail_atta_id).val(data.result.id);$(#thumbnail).attr(src, data.result.url).show();}});//查看缩略图$(#showThumbnail).click(function(){var src = $(#thumbnail).attr(src);var id=$(#thumbnail_atta_id).val();if (!src) {$.get(/atta/show/${news.thumbnail_atta_id!}, function(res) {var url=localurl+res[0].url;//var url = "/img/bd_logo1.jpg" alt="html如何实现页面上传图片并且能进行展示的示例代码分享" title="html如何实现页面上传图片并且能进行展示的示例代码分享";alert(url);$(#thumbnail).attr(src, url).show();}, json)}})
Java代码：
Controller类：
/*** 上传并返回附件ID及URL*/public void upload() {UploadFile file = getFile();String fileName = file.getFileName();String fileSuffix = getSuffix(fileName);String module = getPara(0);String category = getPara(1);String id = AttachmentService.me.uploadFile(file, module, category);Map json = new HashMap();json.put("id", id);json.put("url", "/upload/" + category + "/" + module + "/" + id + fileSuffix);json.put("name", fileName);renderJson(json);}/*** 返回给定ID的附件的访问URL*/public void show() {String ids = getPara();if (null == ids) {ids = getPara("ids");}String[] idArr = ids.split(",");StringBuffer sql = new StringBuffer();sql.append(" select * from attachment where id in ( ");for (int index = 0; index < idArr.length; index++) {sql.append(" ? ");if (index != idArr.length - 1) {sql.append(" , ");}}sql.append(" ) ");List<Map> json = new ArrayList<Map>();List list = Attachment.me.find(sql.toString(), (Object[])idArr);//转换成JsonArrayString url = null;for (Attachment atta : list) {url = getAttaURL(atta);Map item = new HashMap();item.put("id", atta.getStr("id"));item.put("url", url);item.put("name", atta.getStr("name"));json.add(item);}renderJson(json);}private String getAttaURL(Attachment atta) {StringBuffer path = new StringBuffer();path.append(File.separator + "upload" + File.separator);path.append(atta.getStr("category"));path.append(File.separator);path.append(atta.getStr("module"));path.append(File.separator);path.append(atta.getStr("id"));path.append(getSuffix(atta.getStr("name")));return path.toString();}private String getSuffix(String name) {return name.replaceAll(".*(\\..*)", "$1");}
service类：
/*** 上传文件* @param file uploadFile* @param module模块，如news/cases/doctor/* @param category分类，如缩略图thumbnail/头像avatar/幻灯片ppt* @return 附件主键* @throws IOException */public String uploadFile(UploadFile file, String module, String category) {String attachmentId = CommonUtils.getUUID();File f = file.getFile();new Attachment().set("id", attachmentId).set("name", file.getOriginalFileName()).set("size", f.length()).set("content_type", file.getContentType()).set("module", module).set("category", category).set("upload_time", new Date()).save();try {//重命名String dirPath = file.getSaveDirectory();File renamedFile = new File(dirPath + attachmentId + file.getOriginalFileName().replaceAll(".*(\\..*)", "$1"));FileUtils.moveFile(f, renamedFile);//PPT需要转换成图片，拷贝一份到转换目录(/upload/trans/ppt)if (category.equals("ppt")) {FileUtils.copyFileToDirectory(renamedFile, new File(dirPath + "trans/ppt/"), true);}//拷贝到对应的目录下FileUtils.moveToDirectory(renamedFile, new File(dirPath + category + File.separator + module), true);} catch(Exception e) {e.printStackTrace();}return attachmentId;}
