拖拽文件上传（Java篇）dropzone.js的简单使用
java实习生一枚，前端知识薄弱，最近因为工作需要，做了一个拖拽文件上传的功能，发现dropzone.js挺不错的，特地做个笔记。
dropzonejs 的官网是：http://www.dropzonejs.com/， 中文手册是：http://wxb.github.io/dropzonejs.com.zh-CN/
自己写的拖拽文件至一个按钮上传的功能，前端及java代码如下：
jsp页面：
1. 首先必须引入dropzone的js和css文件
2.自己定义两个div区域
<%--拖拽文件上传 --%>
uopload
3.对dropzone.css进行修改，将文件内的所有dropzone替换为dropz
修改文件拖拽区域的显示样式：
.dropz {/*设置拖拽上传文件按钮的格式*/
min-height:0px;
min-width: 100px;
border: 1px solid #58AF0C;
background: white;
padding: 15px 20px;
background-color: #7AC143;
background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0, #7AC143),
color-stop(1, #7AC143));
background-position: center top;
background-repeat: no-repeat;
border-radius: 5px;
min-height:0px;
min-width: 100px;
padding: 15px 20px;
color: #FFF;
font: bold 12px Arial, Helvetica, sans-serif;
text-align: center;
text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
}
.dropz.dz-clickable {
cursor: pointer;
line-height: 0px;/*按钮中的文字垂直居中*/
}4.在jsp对div进行dropzone参数的自定义
java后台处理文件上传的代码：
@RequestMapping(params = "saveFile", method = RequestMethod.POST)
public void saveFile(HttpServletRequest request, HttpServletResponse response, TSDocument document) throws Exception{
Map attributes = new HashMap();
TSTypegroup tsTypegroup=systemService.getTypeGroup("fieltype","文档分类");
TSType tsType = systemService.getType("files","附件", tsTypegroup);
String fileKey = oConvertUtils.getString(request.getParameter("fileKey"));// 文件ID
String documentTitle = oConvertUtils.getString(request.getParameter("documentTitle"),"uploadfile");// 文件标题
if (StringUtil.isNotEmpty(fileKey)) {
document.setId(fileKey);
document = systemService.getEntity(TSDocument.class, fileKey);
document.setDocumentTitle(documentTitle);
}
document.setBusinessKey(request.getParameter("businessKey"));
document.setSubclassname(MyClassLoader.getPackPath(document));
document.setCreatedate(DateUtils.gettimestamp());
document.setTSType(tsType);
UploadFile uploadFile = new UploadFile(request, document);
uploadFile.setCusPath("files");
uploadFile.setSwfpath("swfpath");
document = systemService.uploadFile(uploadFile);
attributes.put("url", document.getRealpath());
attributes.put("fileKey", document.getId());
if (ResourceUtil.getSessionUserName()!=null) {
attributes.put("uploadUser", ResourceUtil.getSessionUserName().getUserName());
}else{
attributes.put("uploadUser", "null");
}
attributes.put("time", new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
attributes.put("name", document.getAttachmenttitle()+"."+document.getExtend());
attributes.put("downloadurl", "commonController.action?viewFile&fileid="+ document.getId()+"&subclassname=");
attributes.put("viewhref", "commonController.action?objfileList&fileKey=" + document.getId());
attributes.put("delurl", "commonController.action?delObjFile&fileKey=" + document.getId());
attributes.put("realPath", document.getRealpath());
if(FileUtils.isPicture(document.getExtend())){
attributes.put("imgUrl", document.getRealpath());
}
JSONObject js = new JSONObject(attributes);
response.getWriter().write(js.toString());
response.getWriter().flush();
} 注意这里的返回值是直接返回的json对象，如果采用
@RequestMapping(params = "saveFiles", method = RequestMethod.POST)
@ResponseBody则会报错:
[com.framework.core.common.exception.MyExceptionHandler]org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
更多使用功能请参考dropzone的官方文档。