我有一個需要將文件發送到C++服務器的C++客戶端。我將文件拆分爲PACKET_SIZE(= 1024)個字節的塊,並通過TCP套接字發送它們。在服務器端,我最多可以將PACKET_SIZE字節讀到緩衝區。當客戶端發送小於PACKET_SIZE的文件時,服務器會收到比發送的更多字節。即使我將字節數限制爲文件的大小,文件也不同。我知道這個問題與客戶端無關,因爲我已經用C++服務器測試了它,並且它的工作完美無瑕。將文件從C++客戶端傳輸到Java服務器
謝謝。
服務器:
public void run() {
DataInputStream input = null;
PrintWriter output = null;
try {
input = new DataInputStream (_client.getInputStream());
}
catch (Exception e) {/* Error handling code */}
FileHeader fh = recvHeader(input);
size = fh._size;
filename = fh._name;
try {
output = new PrintWriter(_client.getOutputStream(), true);
}
catch (Exception e) {/* Error handling code */}
output.write(HEADER_ACK);
output.flush();
FileOutputStream file = null;
try {
file = new FileOutputStream(filename);
}
catch (FileNotFoundException fnfe) {/* Error handling code */}
int total_bytes_rcvd = 0, bytes_rcvd = 0, packets_rcvd = 0;
byte [] buf = new byte [PACKET_DATA_SIZE];
try {
int max = (size > PACKET_DATA_SIZE)? PACKET_DATA_SIZE: size;
bytes_rcvd = input.read(buf,0, max);
while (total_bytes_rcvd < size) {
if (-1 == bytes_rcvd) {...}
++packets_rcvd;
total_bytes_rcvd += bytes_rcvd;
file.write (buf,0, bytes_rcvd);
if (total_bytes_rcvd < size)
bytes_rcvd = input.read(buf);
}
file.close();
}
catch (Exception e) {/* Error handling code */}
}
客戶:
char packet [PACKET_SIZE] ;
file.open (filename, ios::in | ios::binary);//fopen (file_path , "rb");
int max = 0;
if (file.is_open()) {
if (size > PACKET_SIZE)
max = PACKET_SIZE;
else
max = size;
file.read (packet , max);
}
else {...}
int sent_packets = 0;
while (sent_packets < (int) ceil (((float)size)/PACKET_SIZE)) {
_write=send(_sd , packet, max,0);
if (_write <0) {...}
else {
++sent_packets;
if (size > PACKET_SIZE* sent_packets) {
if (size - PACKET_SIZE* sent_packets >= PACKET_SIZE)
max = PACKET_SIZE;
else
max = size - PACKET_SIZE* sent_packets;
file.read (packet , max);
}
}
}