获取响应文件使用ExtJS [英] Get response file use ExtJS

问题描述

我使用ExtJS为我的程序构建客户端。有一种情况，我想向服务器发送一个Ajax请求，并获取响应文件（二进制文件，而不是纯文本文件，即XLS或PDF）。如何通过ExtJS获取返回的文件（我的意思是可以将文件下载并存储到客户端）？我不能使用 var result = Ext.decode（response.responseText）来接收结果，因为响应包含二进制数据，无法解码。

I use ExtJS to build the client-side for my program. There's a situation that I want to send an Ajax request to server, and get the response file (binary file, not plain text file, i.e XLS or PDF). How can I get that returned file by ExtJS (I mean that file can be downloaded and stored to client)? I cannot use var result = Ext.decode(response.responseText) to receive the result because reponse contains binary data and it cannot be decoded.

Ajax调用非常简单：

The Ajax call is very simple :

Ext.Ajax.request({
    url : 'myController/exportFile',
    method : 'GET',
    success : function(response, opts) {
        // What should I do to get the file?
    },
    failure : function(response, opts) {
        alert('Export file failed!')
    }
});

这是我的服务器操作返回文件：

Here is my server action to return file:

public void sendFile(HttpServletResponse response, String filePath) {
        def file = new File(filePath);
        response.setContentType("application/octet-stream");
        response.setHeader("Content-disposition", "attachment;filename=${file.getName()}");     
        response.outputStream << file.newInputStream();
    }

非常感谢！

推荐答案

如果您需要用典型浏览器提供的用户提供的打开/保存对话框，则不需要使用此AJAX。

If you need the user to be prompted with the typical browser provided open/save dialog box, you don't need to make this call AJAX.

只需从您的页面链接到 myController / exportFile 即可。例如
< a href =myController / exportFile>我的文件< / a>

Just linking to myController/exportFile from your page should be enough.
e.g. <a href="myController/exportFile">my file</a>

工作，来自 myController / exportFile 的HTTP响应必须包含适当的标题（即Content-type和Content-disposition），告诉浏览器这是文件。show open / save对话框，并根据您的代码段，我看到您已经有这样的照顾。

For this approach to work, HTTP response from myController/exportFile must include the appropriate headers (namely, Content-type and Content-disposition) that tell the browser "this is file. show open/save dialog" and based on your snippet, I see that you already have this taken care of.

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