This is a typical instant communication systems, Java implementation, can just QQ, similar to the QQ mutual trust communication.

Instant communication system\ChatFrame.java
............................\ClientManageFrame.java
............................\DBConnection.java
............................\FindUserDlg.java
............................\FindUserInfo.java
............................\FriendLabel.java
............................\Login.java
............................\LoginUser.java
............................\MyInfo_AboutBox.java
............................\MyQQ.ldb
............................\MyQQ.mdb
............................\ReceiveOthersDialog.java
............................\RegisterDialog.java
............................\Server.java
............................\ServerFrame.java
............................\ServerThread.java
............................\SetCenter.java
............................\showTimeTask.java
............................\StartServer.java
............................\UpdateDialog.java
............................\UserInfo.java
............................\UserInfoBean.java
............................\QQ\about.png
............................\..\ChatFrame.class
............................\..\ClientManageFrame.jbx
............................\..\DBConnection.class
............................\..\FindUserDlg.class
............................\..\FindUserInfo.class
............................\..\FriendLabel.class
............................\..\Login.class
............................\..\LoginUser.class
............................\..\MyInfo_AboutBox.class
............................\..\ReceiveOthersDialog.class
............................\..\RegisterDialog$1.class
............................\..\RegisterDialog.class
............................\..\Server.class
............................\..\ServerFrame.class
............................\..\ServerThread.class
............................\..\SetCenter.class
............................\..\showTimeTask.class
............................\..\StartServer$1.class
............................\..\StartServer.class
............................\..\UpdateDialog$1.class
............................\..\UpdateDialog.class
............................\..\UserInfo.class
............................\..\UserInfoBean.class
............................\property\dbProperties.txt
............................\image\face\1-1.gif
............................\.....\....\1-2.gif
............................\.....\....\1-3.gif
............................\.....\....\10-1.gif
............................\.....\....\10-2.gif
............................\.....\....\10-3.gif
............................\.....\....\11-1.gif
............................\.....\....\11-2.gif
............................\.....\....\11-3.gif
............................\.....\....\12-1.gif
............................\.....\....\12-2.gif
............................\.....\....\12-3.gif
............................\.....\....\13-1.gif
............................\.....\....\13-2.gif
............................\.....\....\13-3.gif
............................\.....\....\14-1.gif
............................\.....\....\14-2.gif
............................\.....\....\14-3.gif
............................\.....\....\15-1.gif
............................\.....\....\15-2.gif
............................\.....\....\15-3.gif
............................\.....\....\16-1.gif
............................\.....\....\16-2.gif
............................\.....\....\16-3.gif
............................\.....\....\17-1.gif
............................\.....\....\17-2.gif
............................\.....\....\17-3.gif
............................\.....\....\18-1.gif
............................\.....\....\18-2.gif
............................\.....\....\18-3.gif
............................\.....\....\19-1.gif
............................\.....\....\19-2.gif
............................\.....\....\19-3.gif
............................\.....\....\2-1.gif
............................\.....\....\2-2.gif
............................\.....\....\2-3.gif
............................\.....\....\20-1.gif
........................

• We are an exchange download platform that only provides communication channels. The downloaded content comes from the internet. Except for download issues, please Google on your own.
• The downloaded content is provided for members to upload. If it unintentionally infringes on your copyright, please contact us.
• Please use Winrar for decompression tools
• If download fail, Try it againg or Feedback to us.
• If downloaded content did not match the introduction, Feedback to us，Confirm and will be refund.
• Before downloading, you can inquire through the uploaded person information

Nothing．