我正在尝试将文件从客户端发送到服务器端。这里,WritableGUI是一个在文本区域中显示文件名的接口。文件已传输到服务器但已损坏。有时传输的文件大小是正确的,但有时它显示文件大小为0 kb。我的代码怎么了?
客户端:
public class FileClient {
private Socket s;
private String fileName;
private long fileLength;
public FileClient(String host, int port, String file, String fileName, long FileLength) {
this.fileName = fileName;
this.fileLength = FileLength;
try {
s = new Socket(host, port);
sendFile(file);
} catch (Exception e) {
e.printStackTrace();
}
}
public void sendFile(String file) throws IOException {
DataOutputStream dos = new DataOutputStream(s.getOutputStream());
FileInputStream fis = new FileInputStream(file);
byte[] buffer = new byte[1024];
dos.writeUTF(fileName);
dos.writeLong(fileLength);
while (fis.read(buffer) > 0) {
dos.write(buffer);
}
fis.close();
dos.close();
}
}
服务器端:
public class FileServer extends Thread {
ServerSocket server;
int port = 8877;
WritableGUI gui;
public FileServer(WritableGUI gui, int SOCKET_PORT) throws IOException {
this.port = SOCKET_PORT;
this.gui = gui;
try {
server = new ServerSocket(port);
} catch (IOException ex) {
Logger.getLogger(MessageListener.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void run() {
while (true) {
try {
Socket clientSock = server.accept();
saveFile(clientSock);
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void saveFile(Socket clientSock) throws IOException {
DataInputStream dis = new DataInputStream(clientSock.getInputStream());
FileOutputStream fos = new FileOutputStream(dis.readUTF());
byte[] buffer = new byte[1024];
gui.write("File Received: " + dis.readUTF());
long filesize = dis.readLong(); // read file size in separate msg
int read = 0;
int totalRead = 0;
int remaining = (int) filesize;
while ((read = dis.read(buffer, 0, Math.min(buffer.length, remaining))) >= 0) {
totalRead += read;
remaining -= read;
System.out.println("read " + totalRead + " bytes.");
fos.write(buffer, 0, read);
}
dis.close();
fos.close();
}
}
答案 0 :(得分:0)
while (fis.read(buffer) > 0) {
dos.write(buffer);
}
像往常一样。错误的复制循环。试试这个:
int count;
while ((count = fis.read(buffer)) > 0) {
dos.write(buffer, 0, count);
}
并且好好思考为什么。