客户端http post 发送过来包含文件字节码和普通键值的multipart/form-data的数据，作为服务端如何解析并在本地生成文件，求代码。

Question

http post 发送过来包含文件字节码和普通键值的multipart/form-data的数据，作为服务端如何解析并在本地生成文件，求代码。

Answer 1

@PostMapping("/upload")
public String uploadFile(HttpServletRequest request) {
    boolean isMultipart = ServletFileUpload.isMultipartContent(request);
    if (!isMultipart) {
        return "No file uploaded";
    }

    DiskFileItemFactory 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 fileName = item.getName();
                InputStream fileContent = item.getInputStream();

                // 在这里处理文件数据
                // ...

                return "File uploaded successfully";
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
        return "File upload failed";
    }

    return "No file uploaded";
}