Java与Flex建立Socket联接

Socket与其他的通信技术最大的不同是Socket连接在数据传输完成后不会自动关闭,因此服务器可以在任何时间主动发送数据给客户端.?
Flex下Socket连接的方式有Socket和XMLSocket两种.?

读取数据使用的是异步的方式,需要监听对应的事件?
socket.addEventListener( ProgressEvent.SOCKET_DATA, onSocketData );?
xmlSocket.addEventListener( DataEvent.DATA, onData );?

写入数据的方式?
socket下比较常用的是writeUTFBytes(String),writeMultiByte()可以自定义编码,?
使用flush()发送数据?
xmlScoket下 .send(String)?

连接Socket的方式?
socket.connect( "localhost", 2900 ); //代表地址和端口?

如果要跨域连接服务器,需要加载策略文件?
Security.loadPolicyFile("url/crossdomain.xml");?

例子使用Java建立Socket服务器,然后使用Flex连接,并且进行数据交互?

Java代码??

1. package?socket;??
2. ??
3. import?java.io.*;??
4. import?java.net.*;??
5. import?java.util.Scanner;??
6. ??
7. public?class?SocketService?{??
8. ????public?static?void?main(String[]?args)?{??
9. ????????try?{??
10. ????????????System.out.println("启动ServerSocket..");??
11. ????????????int?i=1;??
12. ????????????ServerSocket?s=new?ServerSocket(8189);??
13. ????????????while?(true)?{??
14. ????????????????Socket?incoming=s.accept();??
15. ????????????????System.out.println("新用户"+i);??
16. ????????????????Runnable?r=new?ThreadEcho(incoming);??
17. ????????????????Thread?t=new?Thread(r);??
18. ????????????????t.start();??
19. ????????????????i++;??
20. ????????????}??
21. ????????}?catch?(Exception?e)?{??
22. ????????????e.printStackTrace();??
23. ????????}??
24. ????}??
25. }??
26. class?ThreadEcho?implements?Runnable??
27. {??
28. ????private?Socket?incoming;??
29. ????public?ThreadEcho(Socket?s)??
30. ????{??
31. ????????incoming=s;??
32. ????}??
33. ????public?void?run()?{??
34. ????????try?{??
35. ????????????InputStream?i=incoming.getInputStream();??
36. ????????????OutputStream?o=incoming.getOutputStream();??
37. ????????????Scanner?s=new?Scanner(i);??
38. ????????????PrintWriter?p=new?PrintWriter(o);??
39. ????????????boolean?done=false;??
40. ????????????while(!done?&&?s.hasNext())??
41. ????????????{??
42. ????????????????String?line=s.nextLine();??
43. ????????????????p.println("Echo"+line+"\n");??
44. ????????????????p.flush();??
45. ????????????????System.out.println("MSG"+line);??
46. ????????????????if(line.trim().equals("bye"))??
47. ????????????????{??
48. ????????????????????done=true;??
49. ????????????????}??
50. ????????????}??
51. ????????????System.out.println("用户退出");??
52. ????????}?catch?(Exception?e)?{??
53. ????????????e.printStackTrace();??
54. ????????}finally??
55. ????????{??
56. ????????????try?{??
57. ????????????????incoming.close();??
58. ????????????}?catch?(IOException?e)?{??
59. ????????????????e.printStackTrace();??
60. ????????????}??
61. ????????}??
62. ????}??
63. ??????
64. }??

Actionscript代码??

1. <?xml?version="1.0"?encoding="utf-8"?>??
2. <mx:Application?xmlns:mx="http://www.adobe.com/2006/mxml"?layout="absolute"?>??
3. <mx:Script>??
4. ????<![CDATA[??
5. ????private?var?sock:Socket;??
6. ????????private?function?connSocket():void??
7. ????????{??
8. ????????????sock=new?Socket();??
9. ????????????sock.addEventListener(Event.CONNECT,onConnect)??
10. ????????????sock.addEventListener(ProgressEvent.SOCKET_DATA,MSGHandler)??
11. ????????????sock.connect(adds.text,int(post.text));??
12. ????????}??
13. ????????private?function?onConnect(evt:Event):void??
14. ????????{??
15. ????????????trace("Connection?sucess");??
16. ????????}??
17. ????????private?function?sendMSG():void??
18. ????????{??
19. ????????????sock.writeUTFBytes(mess.text+"\n");??
20. ????????????sock.flush();??
21. ????????????trace('send?msg'+mess.text);??
22. ????????}??
23. ????????/**消息获取函数*/??
24. ????????private?function?MSGHandler(event:ProgressEvent):void??
25. ????????{??
26. ????????????trace("GetMSG"+sock.readUTFBytes(sock.bytesAvailable));??
27. ????????}??
28. ????]]>??
29. </mx:Script>??
30. <mx:Button?label="连接服务器"?click="connSocket()"/>??
31. <mx:TextInput?text="127.0.0.1"?x="100"?width="200"?id="adds"/>??
32. <mx:TextInput?text="8189"?x="300"?id="post"/>??
33. <mx:Button?label="发送数据"?click="sendMSG()"?y="40"/>??
34. <mx:TextInput?id="mess"?x="100"?y="40"/>??
35. </mx:Application>??

注意:需要使用手动的\n结尾发送数据