框架是基於spring+myBatis的。
前台頁面的部分代碼：
<form action="${ctx}/file/upLoadFile.do"method="post" enctype="multipart/form-data" id="form"><table><tbody ><tr ><td>上傳文件:</td><td style="padding-left: 10px;"><input type="file" name="file" id="fileInput"></td><td style="padding-left: 80px;"><button type="submit" class="btn btn-primary btn-q btn-outline fa fa-upload"
class="easyui-validatebox" data-options="required:true">上傳</button></td></tr><tr><td colspan="2"><span style="color:red">*上傳文件格式為xls,xlsx,txt,csv文件!</span> </td>
</tr>
</tbody>
</table></form>
{
title : '操作',
halign : 'center',
align : 'center',
width : 80,
field : 'FILE_PATH',
formatter: function(value,row,index){
var path = "${ctx}/file/download.do?filePath=" + value ;
var button = '<button type="button" class="btn btn-primary btn-q btn-outline fa fa-download" class="easyui-validatebox"
data-options="required:true">下載</button>';
return "<a href='" + path + "'>" + button + "</a>";
}
上傳功能的方法：
@RequestMapping("/upLoadFile")
public String upload(@RequestParam(value = "file", required = false) MultipartFile file, ModelMap model, HttpServletRequest request)
throws Exception {
//設置相對路徑
String realPath = request.getSession().getServletContext().getRealPath("/upload");
//獲取文件的格式
String extention = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".")+1);
//對格式進行篩選
if(extention.equalsIgnoreCase("xls") || extention.equalsIgnoreCase("xlsx") || extention.equalsIgnoreCase("txt")
|| extention.equalsIgnoreCase("csv")) {
//在路徑下創建文件夾
File f = new File(realPath);
String fileName = file.getOriginalFilename();
String uploadPath = realPath + File.separator + fileName;
if(!f.exists()) {
f.mkdir();
}
//文件的傳輸
file.transferTo(new File(uploadPath));
Upload upload = new Upload();
upload.setFileName(fileName);
upload.setFileLength(String.valueOf(file.getSize()));
upload.setFileOwner(super.getLoginUser(request).getLoginId());
upload.setFilePath("/upload/" + fileName);
//將文件的基本信息存到數據庫
fileQueryService.saveFile(upload);
request.setAttribute("info","文件上傳成功!");
} else {
request.setAttribute("info","文件類型不正確，請上傳格式為xls,xlsx,txt,csv文件!");
}
return "page/file/fileInteraction";
}
下載功能的方法：
@RequestMapping("/download")
public String download(String filePath, HttpServletRequest request,
HttpServletResponse response) {
try {
//獲取文件名
String fileName = filePath.substring(filePath.lastIndexOf("/")+1);
System.out.println(filePath);
response.setCharacterEncoding("utf-8");
response.setContentType("multipart/form-data");
//處理下載彈出框名字的編碼問題
response.setHeader("Content-Disposition", "attachment;fileName="
+ new String( fileName.getBytes("gb2312"), "ISO8859-1" ));
//獲取文件的下載路徑
String path = request.getSession().getServletContext().getRealPath(filePath);
System.out.println(path);
//利用輸入輸出流對文件進行下載
InputStream inputStream = new FileInputStream(new File(path));
OutputStream os = response.getOutputStream();
byte[] b = new byte[2048];
int length;
while ((length = inputStream.read(b)) > 0) {
os.write(b, 0, length);
}
// 這里主要關閉。
os.close();
inputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// 返回值要注意，要不然就出現下面這句錯誤！
//java+getOutputStream() has already been called for this response
return null;
}
最終效果：
下載頁面：
文件的上傳和下載完整版demo下載：