[英]Sending binary data multiple times using Sockets in Java/Android
我需要使用Android設備上的Java套接字多次發送二進制數據。 這是一個簡單的對象,可導出run()和send()方法。
public class GpcSocket {
private Socket socket;
private static final int SERVERPORT = 9999;
private static final String SERVER_IP = "10.0.1.4";
public void run() {
new Thread(new ClientThread()).start();
}
public int send(byte[] str) {
try {
final BufferedOutputStream outStream = new BufferedOutputStream(socket.getOutputStream());
outStream.write(str);
outStream.flush();
outStream.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return str.length;
}
class ClientThread implements Runnable {
@Override
public void run() {
try {
InetAddress serverAddr = InetAddress.getByName(SERVER_IP);
socket = new Socket(serverAddr, SERVERPORT);
} catch (UnknownHostException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
對於Android編程,我使用Scaloid,這是多次發送二進制數據的代碼。 count
由參數給出。 result
是Byte [Array]類型的數據,並且gpc
在onCreate()
方法中初始化為gpc = new GpcSocket()
。
gpc.run()
for (i <- 1 to count) {
val length = gpc.send(result)
toast(s"Sent: $i $length")
}
問題是,即使我嘗試多次發送數據,接收方也只會收到一個數據包。 這是我發送信息5次時在服務器(接收方)端顯示的內容:
55:2015-03-21 03:46:51 86: <RECEIVED DATA>
10.0.1.27 wrote:
56:2015-03-21 03:46:51 0:
10.0.1.27 wrote:
57:2015-03-21 03:46:51 0:
10.0.1.27 wrote:
58:2015-03-21 03:46:51 0:
10.0.1.27 wrote:
59:2015-03-21 03:46:51 0:
我的問題是
這是Python中的服務器端代碼:
import SocketServer
from time import gmtime, strftime
count = 1
class MyTCPHandler(SocketServer.BaseRequestHandler):
"""
The RequestHandler class for our server.
It is instantiated once per connection to the server, and must
override the handle() method to implement communication to the
client.
"""
def handle(self):
# self.request is the TCP socket connected to the client
self.data = self.request.recv(1024).strip()
print "{} wrote:".format(self.client_address[0])
global count
count += 1
print "%d:%s %d:%s" % (count, strftime("%Y-%m-%d %H:%M:%S", gmtime()), len(self.data), self.data)
# just send back the same data, but upper-cased
self.request.sendall(self.data.upper())
if __name__ == "__main__":
HOST, PORT = "10.0.1.4", 9999
# Create the server, binding to localhost on port 9999
server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler)
# Activate the server; this will keep running until you
# interrupt the program with Ctrl-C
server.serve_forever()
從這篇文章: 使用Java套接字發送ByteArray(Android編程)以及如何修復java.net.SocketException:管道損壞? ,似乎send()方法是錯誤的。
我將send()修改為創建套接字並在使用完畢后將其關閉的簡單方法。
public int send(byte[] str) throws IOException {
InetAddress serverAddr = InetAddress.getByName(SERVER_IP);
socket = new Socket(serverAddr, SERVERPORT);
out = socket.getOutputStream();
out.write(str);
out.flush();
out.close();
socket.close();
return str.length;
}
調用它的scala代碼被修改為調用send()方法。
// gpc.run()
for (i <- 1 to count) {
...
val length = gpc.send(result)
println(s"Sent: $i $length")
}
... in initializer
gpc = new GpcSocket()
這篇文章的提示: android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)上的android.os.NetworkOnMainThreadException ,應為Android設備添加此代碼,以防止E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: scaloid.example, PID: 1791 android.os.NetworkOnMainThreadException
錯誤。
val policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
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