我创建了一个应用，其中设备必须将2个txt文件发送到另一个设备。
客户端代码段（发送者代码）：
downloadButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startDownload();
setReceivedFileFromServer("1.Received file from server with success...");
setSendFileSuccess("2.Sending to Client.....");
final ScheduledExecutorService exec = Executors.newScheduledThreadPool(5);
exec.schedule(new Runnable() {
@Override
public void run() {
try {
Log.d("Activity", "calling sendRequestedFile()");
sendRequestedFile();
} catch (IOException e) {
e.printStackTrace();
Log.d("FileSendService", "Error sending file to: " + getClientInetAddress().toString());
}
try {
Log.d("Activity", "calling sendRequestedFile()");
sendRequestedFile2();
} catch (IOException e) {
e.printStackTrace();
Log.d("FileSendService", "Error sending file to: " + getClientInetAddress().toString());
}
}
}, 5, TimeUnit.SECONDS);
setWaitingLabel("");
}
});
private void sendRequestedFile() throws IOException {
Socket socket2 = null;
String host = getClientInetAddress().toString();
host = host.substring(1);
socket2 = new Socket(host, 8383);
File file = new File(Environment.getExternalStorageDirectory() + "/" + getFileName());
long length = file.length();
Log.d("FileSendService", "File length: " + length);
byte[] bytes = new byte[16 * 1024];
InputStream in = new FileInputStream(file);
OutputStream out = socket2.getOutputStream();
int count;
while ((count = in.read(bytes)) > 0) {
out.write(bytes, 0, count);
}
out.close();
in.close();
socket2.close();
}
private void sendRequestedFile2() throws IOException
{
Socket socket2 = null;
String host = getClientInetAddress().toString();
host = host.substring(1);
socket2 = new Socket(host, 8484);
File file = new File(Environment.getExternalStorageDirectory() + "/skc" + getFileName());
long length = file.length();
Log.d("FileSendService", "File length: " + length);
byte[] bytes = new byte[16 * 1024];
InputStream in = new FileInputStream(file);
OutputStream out = socket2.getOutputStream();
int count;
while ((count = in.read(bytes)) > 0) {
out.write(bytes, 0, count);
}
out.close();
in.close();
socket2.close();
setSendFileSuccess("2.File was sent to client: "+getClientInetAddress().toString());
}
接收器/服务器片段：
private class ReceiveRequestedFileAsync extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
ServerSocket serverSocket = null;
Socket client = null;
InputStream in = null;
OutputStream out = null;
try {
Log.v("RequestedFileReceiveService", "Creating server socket");
serverSocket = new ServerSocket(8383);
client = serverSocket.accept();
in = client.getInputStream();
out = new FileOutputStream(Environment.getExternalStorageDirectory()+"/"+retrieveFileNameFromURL(getInsertedUrl()));
byte[] bytes = new byte[16*1024];
int count;
while ((count = in.read(bytes)) > 0)
{
out.write(bytes, 0, count);
}
out.close();
in.close();
client.close();
serverSocket.close();
return null;
} catch (IOException e) {}
return null;
}
@Override
protected void onPostExecute(String result)
{
_ReceiveRequestedFileAsync2 = new ReceiveRequestedFileAsync2();
_ReceiveRequestedFileAsync2.execute();
}
}
private class ReceiveRequestedFileAsync2 extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
ServerSocket serverSocket = null;
Socket client = null;
InputStream in = null;
OutputStream out = null;
try {
Log.v("RequestedFileReceiveService", "Creating server socket");
serverSocket = new ServerSocket(8484);
client = serverSocket.accept();
in = client.getInputStream();
out = new FileOutputStream(Environment.getExternalStorageDirectory()+"/skc"+retrieveFileNameFromURL(getInsertedUrl()));
byte[] bytes = new byte[16*1024];
int count;
while ((count = in.read(bytes)) > 0)
{
out.write(bytes, 0, count);
}
out.close();
in.close();
client.close();
serverSocket.close();
return null;
} catch (IOException e) {}
return null;
}
}
第一个文件成功转移，但当我尝试转移第二个文件时，我收到此错误：
01-17 22:23:44.882 25187-27460/com.android.python27 W/System.err: java.net.ConnectException: failed to connect to /192.168.49.10 (port 8484): connect failed: ECONNREFUSED (Connection refused)
01-17 22:23:44.892 25187-27460/com.android.python27 W/System.err: at libcore.io.IoBridge.connect(IoBridge.java:124)
01-17 22:23:44.902 25187-27460/com.android.python27 W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
01-17 22:23:44.902 25187-27460/com.android.python27 W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
01-17 22:23:44.902 25187-27460/com.android.python27 W/System.err: at java.net.Socket.startupSocket(Socket.java:590)
01-17 22:23:44.902 25187-27460/com.android.python27 W/System.err: at java.net.Socket.tryAllAddresses(Socket.java:128)
01-17 22:23:44.902 25187-27460/com.android.python27 W/System.err: at java.net.Socket.<init>(Socket.java:178)
01-17 22:23:44.902 25187-27460/com.android.python27 W/System.err: at java.net.Socket.<init>(Socket.java:150)
答案 0 :(得分：0)
您创建两个服务器（在两个不同的端口上）。但是，只有在第一台服务器收到文件时才创建第二台服务器。
在客户端，您可以创建直接发送两个文件的rwo客户端。我认为第二个客户端无法连接，因为第二个服务器尚未启动。
话虽如此，我想知道你为什么要使用两个端口。一台服务器可以处理多个cllients和文件传输。