使用ServletOutputStream在Java servlet中编写非常大的文件而不会出现内存问题

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class LargeFileServlet extends HttpServlet {
    private static final int BUFFER_SIZE = 16 * 1024;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 设置响应类型和编码
        response.setContentType("application/octet-stream");
        response.setCharacterEncoding("UTF-8");

        // 获取文件输入流
        FileInputStream fis = new FileInputStream("large_file.dat");

        // 使用BufferedOutputStream和FileOutputStream将ServletOutputStream包装
        BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream(), BUFFER_SIZE);

        // 使用文件分块技术，将大文件分成多个较小的块，并逐个处理每个块
        byte[] buffer = new byte[BUFFER_SIZE];
        int bytesRead;
        while ((bytesRead = fis.read(buffer)) != -1) {
            bos.write(buffer, 0, bytesRead);
            bos.flush();
        }

        // 关闭资源
        bos.close();
        fis.close();
    }
}