java 如何在 Vaadin7 中从服务器下载文件？
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How to download file from server in Vaadin7?
提问by Boris Mitioglov
I have FileResource
我有文件资源
FileResource curResource = new FileResource(new File(basepath +
"/WEB-INF/docs/"+path+".pdf"));
and i want save this file from browser on the computer by click the button. How can i do this in Vaadin 7? Thanks
我想通过单击按钮从计算机上的浏览器保存此文件。我怎样才能在 Vaadin 7 中做到这一点？谢谢
I try something like this:
我尝试这样的事情：
ExternalResource resource = new ExternalResource(basepath +
"/WEB-INF/icons/"+"block_16.png");
Page.getCurrent().open(resource.getURL(),"Download",true);
but i have empty about:blank page and nothing happens...
但我有空的 about:blank page 并且没有任何反应...
回答by Boris Mitioglov
I resolve my problem!
我解决了我的问题！
private String basepath = VaadinService.getCurrent()
.getBaseDirectory().getAbsolutePath();
private Button saveExcel = new Button();
Resource res = new FileResource(new File(basepath +
"/WEB-INF/docs/settings.xlsx"));
FileDownloader fd = new FileDownloader(res);
fd.extend(saveExcel);
It's so easy to download from server in Vaadin
在 Vaadin 从服务器下载是如此简单
回答by Nhat Nam NGUYEN
The problem of this solution is that: The file name and file content must be known before you call the fd.extend.
这个方案的问题在于：调用fd.extend之前必须知道文件名和文件内容。
If you want to build the file name and file content on demand, see the tutorial in Vaadin wiki page: Letting The User Download A File
如果您想按需构建文件名和文件内容，请参阅 Vaadin wiki 页面中的教程：让用户下载文件
