文件上传、下载、删除功能

1.文件上传
前端代码：

 1 html代码：<%--layui自带的原始的文件上传控件--%>
 2 <input type="file" name="file" id="test20">
 3 js代码：<%--accept为上传文件指定格式，file为所有文件类型，url为上传到后台的路径 --%>
 4 layui.use('upload', function(){
 5 var $ = layui.jquery
 6 ,upload = layui.upload;
 7 //绑定原始文件域
 8 upload.render({
 9 elem: '#test20'
10 ,accept: 'file'
11 ,url: '${ctx}/fpPlaceFile/uploadFile/${placeId}'
12 });
13 });

后台代码：

//controller层使用MultipartFile file参数接受前台传过来的文件信息
public int uploadFile(MultipartFile mFile, HttpServletRequest request,String strPath, String relativedId,String strRelativedType,String strDesc) 
throws Exception {
//获取user信息
Subject subject = SecurityUtils.getSubject();
MyShiroRealm.ShiroUser shiroUser = (MyShiroRealm.ShiroUser) subject.getPrincipal();
String userName = shiroUser.getUser().getStrAccount();
User user = shiroUser.getUser();
//指定文件存放相对路径
String contentUploadPath = "/static/uploadFiles/" + strPath;
//绝对路径
String appPath = request.getSession().getServletContext().getRealPath(contentUploadPath);
String strFileName = "";
String strFilePath = "";
//判断文件是否为空
if (!mFile.isEmpty()) {
//补充绝对路径
File uploadFileDirct = new File(appPath, userName + "/" + relativedId);
//路径为空，则创建该路径
if (!uploadFileDirct.exists()) {
uploadFileDirct.mkdirs(); 
}
//获取文件名
strFileName = mFile.getOriginalFilename();
//获取文件格式
String suffixName = strFileName.substring(strFileName.lastIndexOf(".") + 1);
String fileName = strDesc+strFileName;
File uploadFile = new File(uploadFileDirct, fileName);
//补充相对路径
strFilePath = contentUploadPath + "/" + userName + "/" + relativedId + "/" + fileName;
//上传文件
mFile.transferTo(uploadFile);
NjAttach njAttach = new NjAttach();
njAttach.setId(fid);
njAttach.setStrName(strFileName);
BigDecimal b = new BigDecimal((double) mFile.getSize() / 1024);
double fileSize = b.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
njAttach.setDoubleSize(fileSize);
njAttach.setStrDocType(suffixName);
njAttach.setRelativedId(relativedId);
njAttach.setStrRelativedType(strRelativedType);
njAttach.setStrDesc(strDesc);
njAttach.setStrPath(strFilePath);
njAttach.setCreateUser(user);
njAttach.setCreateDateTime(DateTools.getFullNowDateTime());
return this.addAttach(njAttach);
}else {
throw new ServiceException("上传失败,文件为空或未选择文件!");
} 
}

删除文件

前台代码：

1 <a class="delete btn-small" target="dialog" 
2 dialogId="upadteFcHydrantDialog22" href="${ctx}/fpPlaceFile/delete/${fpPlaceFile.id}">删除</a>

后台代码：

1 //先获取文件的绝对路径和在服务器保存的文件名
2 String url = fpPlaceFileService.findOneById(id).getFileUrl();
3 String name = fpPlaceFileService.findOneById(id).getUid();
4 String affiPath = url +"/" + name;
5 File pdfFile = new File(request.getSession().getServletContext().getRealPath(affiPath)); 
6 pdfFile.delete();

文件下载

前台代码，无后台代码：

1 <%--直接获取文件的路径和文件名，通过url下载，如果文件是图片，则直接打开--%>
2 <a class="download btn-small" 
3 href="${ctx}${fpPlaceFile.fileUrl}/${fpPlaceFile.uid}">下载</a>

文件上传、下载、删除功能

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