Extjs：使用提交表单上传文件

我正在尝试使用ExtJs和Spring上传文件（excel），没有运气，所以希望你能帮助我。在面板中，我有一个按钮（fileuploadfield），并且我选择一个我想要上传的文件。

I'm trying to upload file (excel) using ExtJs and Spring without luck, so I hope you will help me. In panel I have a button (fileuploadfield) and with that I select a file, which I want to upload.

.
.
,{
    xtype: 'fileuploadfield',
    buttonOnly: true,
    hideLabel: true,
    buttonText: "Importuoti excel failą",
    border: false,
    itemId: "uploadBtn",
    name: 'file'

},
.
.

这是我的控制器。每次我使用fileuploadfield选择文件，它会激活函数uploadFile（）。

This is my controller. Every time I choose file with fileuploadfield it activates function uploadFile().

init: function() {
    var me = this;
    this.listen({
        '#uploadBtn': {
                'change': function(fld, value) {
                    console.log(value);
                    this.getTurtasPanel().setLoading(true, true);
                    if(value != ""){
                        me.uploadFile();
                        fld.reset();
                    }

                }
            },
})

uploadFile函数。

uploadFile function.

uploadFile: function(){
    var fp = Ext.create('Ext.form.Panel', {
        fileUpload: true,
        autoHeight: true,
        bodyStyle: 'padding: 10px 10px 0 10px;',
        labelWidth: 50,
        method: 'POST',
        defaults: {
            anchor: '95%',
            allowBlank: false,
            msgTarget: 'side'
        }
    })
    if(fp.getForm().isValid()){
        fp.getForm().submit({
            url: Turtas.Properties.getServicePath()+'/save/' + record.data.resource,
            headers: {'Content-Type':'multipart/form-data; charset=UTF-8'},
        })
    }

},

和Spring控制器：

And Spring controller:

@RequestMapping(value="turtas/save/gelezinkeliai", method=RequestMethod.POST)
    public @ResponseBody void saveGelezinkeliaiFromExcel(@RequestParam("file") MultipartFile file){
    System.out.println(file);
}

我得到的错误：

Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.io.IOException: org.apache.tomcat.util.http.fileupload.FileUploadException: the request was rejected because no multipart boundary was found

the request was rejected because no multipart boundary was found

我认为问题是在我的客户端请求。我认为我的请求没有附加我要上传的文件。我试图将客户端的Headers设置为未定义，但是内容类型变为application / json，并且我收到请求不是multipart的错误。那么我的代码怎么了？我真的希望有人能帮我解决这个问题。感谢提前！

I think the problem is in my client side request. I think my request doesn't attach the file I want to upload. I tried to set Headers in client side as undefined, but then content type becomes "application/json" and i get error that the request isn't multipart. So what's wrong with my code? I really hope someone will help me to figure out of this problem. Thanks in advance !

更新

感谢@Lorenz Meyer的答案，现在我得到不同的错误：

Thanks @Lorenz Meyer for the answer but now i get different error:

java.lang.IllegalArgumentException：您的InputStream既不是
OLE2流，也不是OOXML流

java.lang.IllegalArgumentException: Your InputStream was neither an OLE2 stream, nor an OOXML stream

我更改了我的源代码。

 @RequestMapping(value="turtas/save/gelezinkeliai", method=RequestMethod.POST)
    public @ResponseBody void saveGelezinkeliaiFromExcel(@RequestParam("file") MultipartFile file){
    System.out.println(file.getContentType());
    System.out.println(file.getSize());
    System.out.println(file.getName());
    System.out.println(file.getOriginalFilename());
    System.out.println(file.isEmpty());
}

输出：

application/octet-stream
0
file

true

从客户端我不包括参数，从服务器端我请求一个参数（文件参数），也许这是问题。错误说我选择不好的格式文件，虽然我选择.xlsx或.xls，同样的错误发生。

From client side i don't include parameters and from server side i request one parameter (file param), maybe that's the problem. Error says i choose bad format files, although i choose .xlsx or .xls, and the same error occurs.