飛鴿傳書（IP Messenger,簡為IPMsg）是一個小巧方便的即時通信軟件，它適合用于局域網內甚至廣域網間進行實時通信和文檔共享。特別是在局域網內傳送文件/文件夾的速度非常快！
  • IPMsg 是一款局域網內即時通信軟件, 基于 TCP/IP(UDP).
  • 可運行于多種操作平臺(Win/Mac/UNIX/Java), 并實現跨平臺信息交流.
  • 不需要服務器支持.
  • 支持文件/文件夾的傳送 (2.00版以上)
  • 通訊數據采用 RSA/Blofish 加密 (2.00版以上)
  • 十分小巧, 簡單易用, 而且你可以完全免費使用它
  • 目前已有的版本包括: Win32, Win16, MacOS, MacOSX, X11, GTK, GNOME,Java 等, 并且公開源代碼。

本文演示了如何使用Java的net包，向IPMSG客戶端發送消息。

IPMSG Command 常量定義如下：

?1?/*==========?Constant?Value?==========*/
?2?public?static?final?long?IPMSG_COMMASK?=?0x000000ff;
?3?public?static?final?long?IPMSG_OPTMASK?=?0xffffff00;
?4?public?static?final?long?IPMSG_NOOPERATION?=?0x00000000;
?5?public?static?final?long?IPMSG_BR_ENTRY?=?0x00000001;
?6?public?static?final?long?IPMSG_BR_EXIT?=?0x00000002;
?7?public?static?final?long?IPMSG_ANSENTRY?=?0x00000003;
?8?public?static?final?long?IPMSG_BR_ABSENCE?=?0x00000004;
?9?
10??
11?
12?public?static?final?long?IPMSG_BR_ISGETLIST?=?0x00000018;
13?public?static?final?long?IPMSG_OKGETLIST?=?0x00000015;
14?public?static?final?long?IPMSG_GETLIST?=?0x00000016;
15?public?static?final?long?IPMSG_ANSLIST?=?0x00000017;
16?
17?public?static?final?long?IPMSG_SENDMSG?=?0x00000020;
18?public?static?final?long?IPMSG_RECVMSG?=?0x00000021;
19?
20?public?static?final?long?IPMSG_READMSG?=?0x00000030;
21?public?static?final?long?IPMSG_DELMSG?=?0x00000031;
22?
23?public?static?final?long?IPMSG_GETINFO?=?0x00000040;
24?public?static?final?long?IPMSG_SENDINFO?=?0x00000041;
25?
26?//?other?opt
27?public?static?final?long?IPMSG_ABSENCEOPT?=?0x00000100;
28?public?static?final?long?IPMSG_SERVEROPT?=?0x00000200;
29?public?static?final?long?IPMSG_DIALUPOPT?=?0x00010000;
30?
31?//?send?opt
32?public?static?final?long?IPMSG_SENDCHECKOPT?=?0x00000100;
33?public?static?final?long?IPMSG_SECRETOPT?=?0x00000200;
34?public?static?final?long?IPMSG_BROADCASTOPT?=?0x00000400;
35?public?static?final?long?IPMSG_MULTICASTOPT?=?0x00000800;
36?public?static?final?long?IPMSG_NOPOPUPOPT?=?0x00001000;
37?public?static?final?long?IPMSG_AUTORETOPT?=?0x00002000;
38?public?static?final?long?IPMSG_RETRYOPT?=?0x00004000;
39?public?static?final?long?IPMSG_PASSWORDOPT?=?0x00008000;
40?public?static?final?long?IPMSG_NOLOGOPT?=?0x00020000;
41?public?static?final?long?IPMSG_NEWMUTIOPT?=?0x00040000;
42?
43?public?static?final?int?MAXBUF?=?8192;
44?/*==========?end?==========*/

IPMSG收發數據包的格式（一行）：
1?version(IPMSG版本):no(消息編號，可以用系統時間):user(發送消息的用戶名):host(發送消息的主機名):command(上述?Command?常量，可以用?|?組合多個值):msg(消息內容)

示例(向IPMSG發送消息，需要先打開對方的IPMSG)：
?1?import?java.io.IOException;
?2?import?java.net.DatagramPacket;
?3?import?java.net.DatagramSocket;
?4?import?java.net.InetAddress;
?5?import?java.net.SocketException;
?6?import?java.net.UnknownHostException;
?7?import?java.util.Date;
?8?
?9?/**
10??*?@author?亂?7?8?糟?http://www.fadesky.com
11??*/
12?public?class?TestIPMSG
13?{
14???public?static?void?main(String[]?args)
15???{
16?????DatagramSocket?socket;
17?????InetAddress?address;
18?
19?????long?IPMSG_SENDMSG?=?0x00000020;
20?
21?????String?SENDER?=?"亂?7?8?糟";
22?????String?HOST?=?"Localhost";
23?????String?MSG_CONTENT?=?"Hello?World!";
24?
25?????try
26?????{
27???????socket?=?new?DatagramSocket();
28???????address?=?InetAddress.getByName("192.168.1.20");// 發送給消息的地址
29?
30???????/**
31????????*?IPMSG收發數據包的格式（一行）：
32????????*?
33????????*?version(IPMSG版本):no(消息編號，可以用系統時間):user(發送消息的用戶名):
34????????*?host(發送消息的主機名):command(上述?Command?常量，可以用?|?組合多個值):
35????????*?msg(消息內容)
36????????*?
37????????*/
38???????byte[]?buffer?=?("1:"?+?new?Date().getTime()?+?":"?+?SENDER?+?":"?+?HOST
39???????????+?":"?+?IPMSG_SENDMSG?+?":"?+?MSG_CONTENT).getBytes();
40?
41???????DatagramPacket?packet?=?new?DatagramPacket(buffer,?buffer.length,
42???????????address,?2425);
43???????socket.send(packet);?//?發送報文
44?
45???????packet?=?new?DatagramPacket(buffer,?buffer.length);
46???????socket.receive(packet);//?接收回應
47?
48???????String?message?=?new?String(packet.getData());?//?得到報文信息
49?
50???????System.out.println(message);?//?顯示對方返回的信息
51?????}
52?????catch?(UnknownHostException?e)
53?????{
54???????e.printStackTrace();
55?????}
56?????catch?(SocketException?e)
57?????{
58???????e.printStackTrace();
59?????}
60?
61?????catch?(IOException?e)
62?????{
63???????e.printStackTrace();
64?????}
65?
66???}
67?
68?}
69?

你可以在 SourceForge 找到開源的 IP MSG for Java

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