如何读取通过ajax发送到Java服务器的blob

import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/ajaxblob")
public class AjaxBlobServlet extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            // 获取请求体中的Blob数据
            InputStream inputStream = request.getInputStream();

            // 读取Blob数据
            byte[] data = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(data)) != -1) {
                // 处理读取到的数据
                // ...
            }

            // 关闭输入流
            inputStream.close();

            // 返回响应
            response.getWriter().write("Blob data received successfully.");
        } catch (Exception e) {
            // 处理异常
            // ...
        }
    }
}