質問編集履歴
2
codeの変更をしました
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -6,13 +6,11 @@
|
|
|
6
6
|
|
|
7
7
|
|
|
8
8
|
|
|
9
|
-
public class UDPEcho
|
|
9
|
+
public class UDPEchoServer {
|
|
10
10
|
|
|
11
11
|
|
|
12
12
|
|
|
13
|
-
private static final int TIMEOUT = 3000; // Resend timeout (milliseconds)
|
|
14
|
-
|
|
15
|
-
private static final int MAX
|
|
13
|
+
private static final int ECHOMAX = 255; // Maximum size of echo datagram
|
|
16
14
|
|
|
17
15
|
|
|
18
16
|
|
|
@@ -20,93 +18,47 @@
|
|
|
20
18
|
|
|
21
19
|
|
|
22
20
|
|
|
23
|
-
if (
|
|
21
|
+
if (args.length != 1) // Test for correct argument list
|
|
24
22
|
|
|
25
|
-
throw new IllegalArgumentException("Parameter(s): <
|
|
23
|
+
throw new IllegalArgumentException("Parameter(s): <Port>");
|
|
26
24
|
|
|
27
25
|
|
|
28
26
|
|
|
29
|
-
System.out.println("
|
|
27
|
+
System.out.println("Datagramを UTP で受け取ります");
|
|
28
|
+
|
|
29
|
+
System.out.println("UTP: Unshielded Twist Pair ケーブル");
|
|
30
30
|
|
|
31
31
|
|
|
32
32
|
|
|
33
|
-
InetAddress serverAddress = InetAddress.getByName(args[0]); // Server address
|
|
34
|
-
|
|
35
|
-
// Convert input String to bytes using the default character encoding
|
|
36
|
-
|
|
37
|
-
byte[] bytesToSend = args[1].getBytes();
|
|
38
|
-
|
|
39
|
-
System.out.println("Sending : " + args[1]); // ++appended for test running
|
|
40
|
-
|
|
41
|
-
int servPort =
|
|
33
|
+
int servPort = Integer.parseInt(args[0]);
|
|
42
34
|
|
|
43
35
|
|
|
44
36
|
|
|
45
|
-
DatagramSocket socket = new DatagramSocket();
|
|
37
|
+
DatagramSocket socket = new DatagramSocket(servPort);
|
|
38
|
+
|
|
39
|
+
DatagramPacket packet = new DatagramPacket(new byte[ECHOMAX], ECHOMAX);
|
|
46
40
|
|
|
47
41
|
|
|
48
42
|
|
|
49
|
-
|
|
43
|
+
for (;;) { // Run forever, receiving and echoing datagrams
|
|
50
44
|
|
|
51
|
-
//
|
|
45
|
+
socket.receive(packet); // Receive packet from client
|
|
52
46
|
|
|
53
|
-
|
|
47
|
+
System.out.println("Handling client at " +
|
|
54
48
|
|
|
55
|
-
|
|
49
|
+
packet.getAddress().getHostAddress() + " on port " + packet.getPort());
|
|
56
50
|
|
|
57
|
-
|
|
51
|
+
System.out.println("get data : " +
|
|
58
52
|
|
|
59
|
-
|
|
53
|
+
new String(packet.getData()));
|
|
60
54
|
|
|
61
|
-
|
|
55
|
+
socket.send(packet); // Send back the same message to client
|
|
62
56
|
|
|
57
|
+
packet.setLength(ECHOMAX); // Reset length to avoid shrinking buffer
|
|
63
58
|
|
|
59
|
+
}
|
|
64
60
|
|
|
65
|
-
int tries = 0; // Packets may be lost, so we have to keep trying
|
|
66
|
-
|
|
67
|
-
|
|
61
|
+
/* NOT REACHED */
|
|
68
|
-
|
|
69
|
-
do {
|
|
70
|
-
|
|
71
|
-
socket.send(sendPacket); // Send the echo string
|
|
72
|
-
|
|
73
|
-
try {
|
|
74
|
-
|
|
75
|
-
socket.receive(receivePacket); // Attempt echo reply reception
|
|
76
|
-
|
|
77
|
-
|
|
78
|
-
|
|
79
|
-
if (!receivePacket.getAddress().equals(serverAddress)) // Check source
|
|
80
|
-
|
|
81
|
-
throw new IOException("Received packet from an unknown source");
|
|
82
|
-
|
|
83
|
-
|
|
84
|
-
|
|
85
|
-
receivedResponse = true;
|
|
86
|
-
|
|
87
|
-
} catch (InterruptedIOException e) { // We did not get anything
|
|
88
|
-
|
|
89
|
-
tries += 1;
|
|
90
|
-
|
|
91
|
-
System.out.println("Timed out, " + (MAXTRIES-tries) + " more tries...");
|
|
92
|
-
|
|
93
|
-
}
|
|
94
|
-
|
|
95
|
-
} while ((!receivedResponse) && (tries < MAXTRIES));
|
|
96
|
-
|
|
97
|
-
|
|
98
|
-
|
|
99
|
-
if (receivedResponse)
|
|
100
|
-
|
|
101
|
-
System.out.println("Received: " + new String(receivePacket.getData()));
|
|
102
|
-
|
|
103
|
-
else
|
|
104
|
-
|
|
105
|
-
System.out.println("No response -- giving up.");
|
|
106
|
-
|
|
107
|
-
|
|
108
|
-
|
|
109
|
-
socket.close();
|
|
110
62
|
|
|
111
63
|
}
|
|
112
64
|
|
1
違ったコードを挿入していたので新しくしました。
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -114,6 +114,8 @@
|
|
|
114
114
|
|
|
115
115
|
|
|
116
116
|
|
|
117
|
+
|
|
118
|
+
|
|
117
119
|
```
|
|
118
120
|
|
|
119
121
|
### 実現したいこと
|