如何在将jquery ajax FormData()与多个文件一起使用时如何在multipart/form-data请求上设置边界 [英] How to set a boundary on a multipart/form-data request while using jquery ajax FormData() with multiple files

问题描述

我有一个HTML表单，该表单需要在单个请求中将3个部分上传到现有的REST API.我似乎找不到有关如何在FormData提交中设置边界的文档.

I have an HTML form that needs to upload 3 parts to an existing REST API in a single request. I can't seem to find documentation on how to set a boundary on a FormData submission.

我尝试遵循此处给出的示例: 如何在jQuery中发送带有Ajax请求的FormData对象?

I've attempted to follow the examples given here: How to send FormData objects with Ajax-requests in jQuery?

但是，当我提交数据时，它会被以下堆栈跟踪拒绝:

However when I submit the data it gets rejected with the following stacktrace:

Caused by: org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found.

如何设置边界?

这是HTML/Javascript:

Here is the HTML/Javascript:

   <script type="text/javascript">
    function handleSubmit() {


        var jsonString = "{" +
                "\"userId\":\"" + document.formSubmit.userId.value + "\"" +
                ",\"locale\":\"" + document.formSubmit.locale.value + "\"" +
                "}";

        var data = new FormData();
        data.append('Json',jsonString);
        data.append('frontImage', document.formSubmit.frontImage.files[0]);
        data.append('backImage', document.formSubmit.backImage.files[0]);

        document.getElementById("sent").innerHTML = jsonString;
        document.getElementById("results").innerHTML = "";
        $.ajax({
                   url:getFileSubmitUrl(),
                   data:data,
                   cache: false,
                   processData: false,
                   contentType: 'multipart/form-data',
                   type:'POST',
                   success:function (data, status, req) {
                       handleResults(req);
                   },
                   error:function (req, status, error) {
                       handleResults(req);
                   }
               });
    }

</script>

这是表格:

<form name="formSubmit" action="#">
    userId: <input id="userId" name="userId" value=""/><br/>
    locale: <input name="locale" value="en_US"/><br/>
    front Image: <input type="file" name="frontImage"/><br/>
    back Image: <input type="file" name="backImage"/><br/>
    <input type="button" onclick="handleSubmit();" value="Submit"/>
</form>

在此先感谢您的帮助！

推荐答案

Musa的响应非常有效.将contentType设置为false确实可以正确提交表单数据.谢谢！

Musa's response worked great. Setting the contentType to false did submit the form data correctly. THANKS!

这是有效的ajax调用:

Here is the ajax call that worked:

$.ajax({
    url:getFileSubmitUrl(),
    data:data,
    cache:false,
    processData:false,
    contentType:false,
    type:'POST',
    success:function (data, status, req) {
        handleResults(req);
    },
    error:function (req, status, error) {
        handleResults(req);
    }
});

我还发现此代码也有效:

I also found that this code also worked:

  var oReq = new XMLHttpRequest();
        oReq.open("POST", getFileSubmitUrl());
        oReq.addEventListener("error", transferComplete);
        oReq.addEventListener("load", transferComplete);
        oReq.addEventListener("abort", transferComplete);
        oReq.send(data);
    }
    function transferComplete(evt) {
        handleResults(evt.target);
    }

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