java - 客户端-服务器不发送整个文件

Question

当我运行正在连接的客户端服务器时，我尝试发送一个文件，但它不会发送整个文件，该文件在其他地方出现错误，它大约进行到一半并不断停止在同一部分。当在同一台计算机上运行服务器客户端时，此设置有效，所以我完全困惑

服务器 --->

    // output (a DataOutputstream) is set up elsewhere and messages are sent and received properly
    output.writeInt((int)file.length());
    // send file

    byte [] mybytearray  = new byte [(int)file.length()];
    FileInputStream fis = new FileInputStream(file);
    BufferedInputStream bis = new BufferedInputStream(fis);
    bis.read(mybytearray,0,mybytearray.length);
    System.out.println("Sending " + file + "(" + mybytearray.length + " bytes)");
    output.write(mybytearray,0,mybytearray.length);
    output.flush();
    System.out.println("Done."); 

客户端 --->

            // input (a DataInputstream) is set up elsewhere and messages are sent and received properly
            String FILE_TO_RECEIVED = "Load_From.xml";
            File file = new File(FILE_TO_RECEIVED);

            int FILE_SIZE = input.readInt();
            if(FILE_SIZE!=0){
                // receive file
                System.out.println("received file size : " + FILE_SIZE);
                byte [] mybytearray  = new byte [FILE_SIZE];
                FileOutputStream fos = new FileOutputStream(file);
                BufferedOutputStream bos = new BufferedOutputStream(fos);
                int bytesRead = input.read(mybytearray, 0, mybytearray.length);
                bos.write(mybytearray, 0, bytesRead);

Answer 1

无论是读取文件还是读取套接字时，您都只读取了部分数据。 read 方法返回读取的字节数，您需要一个循环来读取所有内容。例如，

int read = 0, offset = 0;
while ((read = bis.read(mybytearray, offset, mybytearray.length - offset) != -1) {
    offset += read;
}

或者您可以使用标准库中的类，例如 DataInputStream 有一个 readFully 方法。

DataInputStream dis = new DataInputStream(fis);
dis.readFully(mybytearray);