将大文件客户端发送到服务器 [英] Sending large files Client to Server

问题描述

我正在尝试将文件发送到服务器.我可以处理小于100mb的文件.否则我用光了堆.因此，我重新制作了它，但实际上无法使其正常工作.除了读取卡在bis.read(buffer)中的最后一个数据外，我还可以工作，因为它不知道文件何时结束.因此，我尝试发送每个段的长度，以便bufferedInputStream知道何时停止读取.

I'm trying to send files to my server. I got it working with files smaller than 100mb. Otherwise I ran out of heap. So I remade it but can't really get it to work. I also got the to work except for reading the last data I get stuck in bis.read(buffer) because it didn't know when the file ended. So I tried to send the length of each segment so that the bufferedInputStream know when to stop reading.

你知道怎么了吗?

发件人代码:

        FileInputStream fis = new FileInputStream(file);
        byte[] buffer = new byte[2048];
        Integer bytesRead = 0;
        BufferedOutputStream bos = new BufferedOutputStream(clientSocket.getOutputStream());
        BufferedInputStream bis = new BufferedInputStream(fis);

        while ((bytesRead = bis.read(buffer)) > 0) {
            objectOutStream.writeObject(bytesRead);
            bos.write(buffer, 0, bytesRead);

        }
        System.out.println("Sucess sending file");

接收器(服务器):

       fileName = request.getFileName();
       int size = (int) request.getSize();

        BufferedInputStream bis = new BufferedInputStream(clientSocket.getInputStream());

        FileOutputStream fos = new FileOutputStream(fileName);
        int totalBytesReceived = 0;
        int blockSize = 0;
        while (totalBytesReceived < size) {
            Object o = ois.readObject();

            if (!(o instanceof Integer)) {
                System.out.println("Something is wrong");
            }
            blockSize = (Integer) o;

            buffer = new byte[blockSize];

            bis.read(buffer);
            totalBytesReceived += blockSize;
            fos.write(buffer, 0, blockSize);
        }
        System.out.println("File succes");

推荐答案

您在服务器端的阅读代码应与客户端相同.

Your reading code on the server side should look the same as on the client side.

// copy from bis to bos, using a buffer.
for(int len; (len = bis.read(buffer)) > 0) {
    bos.write(buffer, 0, len);
}

在您想要的客户端上

BufferedInputStream bis = new BufferedInputStream(new FileInputStream(filename));
BufferedOutputStream bos = new BufferedOutputStream(clientSocket.getOutputStream());

在所需的服务器端.

BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filename));

完成后想要

bos.close();
bis.close();

如果要使用ObjectOutputStream(建议不要使用)，则只需使用此流，而不必使用流的混合.

If you are going to use an ObjectOutputStream (and I suggest you don't) you need to use only this stream, not a mixture of streams.

这篇关于将大文件客户端发送到服务器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！