当提交的表单具有enctype=属性multipart/ form - data时，如何在控制器中获取表单数据？

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

...

if (ServletFileUpload.isMultipartContent(request)) {
    FileItemFactory factory = new DiskFileItemFactory();
    ServletFileUpload upload = new ServletFileUpload(factory);
    try {
        List<FileItem> items = upload.parseRequest(request);
        for (FileItem item : items) {
            if (item.isFormField()) {
                String fieldName = item.getFieldName();
                String value = item.getString();
                // 处理普通表单字段
            } else {
                // 处理文件字段
            }
        }
    } catch (FileUploadException e) {
        e.printStackTrace();
    }
}

from flask import Flask, request

app = Flask(__name__)

@app.route('/', methods=['POST'])
def handle_form():
    if request.method == 'POST':
        field_value = request.form['field_name']
        # 处理表单字段
    return 'Success'

if __name__ == '__main__':
    app.run()