使用javascript ajax和java后端上传zip文件时出现问题

Question

我正在尝试使用前端的ajax和后端的java API上载zip文件。 我的前端代码是-

    var  formData  = new  FormData();
    var flowName = this.view.getFlowName();
    var flowDescription = this.view.getFlowDescription();

    formData.append('flow-package',  file, file.name); // file is input type file
    formData.append('name', flowName)
    formData.append('description', flowDescription)

    net.ajax({
        url: '/flowautomation/v1/flows',
        type: 'POST',
        contentType: undefined,
        processData:  false,
        data: formData,
        success: this.importFlowSuccess.bind(this),
        error: this.importFlowError.bind(this)
    });

    return true;
},

importFlowSuccess: function (response) {

},

importFlowError: function (error) {

}

在后端，我首先验证zip文件，并且代码在这里-

private FlowPackageErrorCode validate(final byte[] value) {
        if (value == null) {
            return FLOW_PACKAGE_NOT_FOUND;
        }

        try (final ZipInputStream zipStream = new ZipInputStream(new ByteArrayInputStream(value), Charset.forName("UTF-8"))) {
            ZipEntry entry = zipStream.getNextEntry();
            if (entry == null) {
                return FLOW_PACKAGE_EMPTY;
            }

            boolean configExists = false;
            while (entry != null) {
                entry.getCrc();
                entry.getCompressedSize();

                final String entryName = entry.getName();
                if (FLOW_CONFIG_FILE_NAME.equals(entryName)) {
                    configExists = true;
                }

                zipStream.closeEntry();
                entry = zipStream.getNextEntry();
            }
            if (!configExists) {
                return FLOW_CONFIG_NOT_FOUND;
            }

        } catch (final IOException e) {
            LOGGER.debug("Failed to process flow package.", e);
            return FLOW_PACKAGE_CORRUPT;
        }

        return null;
    }

问题在于，后端zipInputstram条目中包含一些奇怪的垃圾字符，因此，该字符失败-

enter image description here

请帮助。