第三步 实现信息共享:在Socket上的实时交流 网络的伟大之一也是信息共享,Server可以主动向所有Client广播消息,同时Client也可以向其它Client发布消息。下面看看如何开发一个可以实时传递消息的程序。9 t: U5 W9 T$ X3 L
设计原理:
8 `5 Y3 a1 O9 _# ~% b$ S, a 服务器端接受客户端的连接请求,同时启动一个线程处理这个连接,线程不停的读取客户端输入,然后把输入加入队列中,等候处理。在线程启动的同时将线程加入队列中,以便在需要的时候定位和取出。6 s* {( |2 s1 U. p0 J. {* s8 w1 ^9 n
{源码}
8 {8 M! q, K7 i: T, X5 X) Q5 P import java.io.*;5 N6 Z" m5 i8 w- _2 D: I
import java.net.*;
8 {7 |" s2 p, ^% q- U1 z2 K import java.util.*;
4 R! S [& f9 n& _" Y import java.lang.*;
7 Q/ C9 i/ Z& W2 ~$ A3 ^# ~ public class Server extends ServerSocket
2 _2 h _9 I4 d, ^1 z8 \% p {
( K& }) v, H( P5 C2 W6 M* H" k$ F private static ArrayList User_List = new ArrayList();
/ M# m" a) M/ a2 [) L/ ]6 Q private static ArrayList Threader = new ArrayList();; }8 _2 ` b( o! Y8 n
private static LinkedList Message_Array = new LinkedList();
* A( \7 b0 l) O& v* F private static int Thread_Counter = 0;
" R! m+ d3 m5 \! E2 W" o private static boolean isClear = true;, m% V2 N+ N/ L8 C
protected static final int SERVER_PORT = 10000;
3 T) i( C2 E4 |. G/ [- N3 q7 \0 i" i protected FileOutputStream LOG_FILE = new FileOutputStream("d:/connect.log", true);! x. y: z: Q# L& {( c& m* {0 v
public Server() throws FileNotFoundException, IOException) H! o$ i4 e! @" x
{
5 f4 d/ O n- z6 [. V5 h. H super(SERVER_PORT);
) W9 |; T- B. J! O$ u' j: J new Broadcast();
8 a! u) S, L# _2 F0 ?% N //append connection log6 Q% m# p4 f' M0 W- c9 y3 M
Calendar now = Calendar.getInstance();: R8 F5 s; {0 t+ X6 j6 _
String str = "[" + now.getTime().toString() + "] Accepted a connection\015\012";
1 Z! w) d. B7 U$ H byte[] tmp = str.getBytes();1 A$ P7 F% b$ e( B
LOG_FILE.write(tmp);
1 @% m; p; ~4 j. } try" O$ L3 C4 Q/ q/ @% r8 Y
{" \. B) E. h8 K3 y5 |% Z
while (true)& [8 e5 |. e/ N9 J0 t/ e, _
{
. i. d c3 E$ a/ Z5 F: l Socket socket = accept();
4 |4 \' q7 w- f2 _, n/ |$ g( [ new CreateServerThread(socket);! P: k8 P8 y2 X9 L$ B$ Q
}
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finally) |' j) H: N( }. k( i
{, | E# F5 D; _: t, r- M' c* d
close();% W5 D5 h/ O; W1 a, |% D' Q/ _- G, U
}
5 w: _. l: E! Y. e i }
8 O( X- G* T& o8 c5 G: I, }1 e5 Z public static void main(String[] args) throws IOException
& a2 Q5 x" n3 l1 v' j! o) m {
4 I0 l' `8 k0 d* V new Server();
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//--- Broadcast
n5 B, k" c/ _ class Broadcast extends Thread
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public Broadcast()
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start();
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public void run(), e. M- m) I' I/ n8 C
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while (true)
; [0 H6 b* B0 J {
* D |2 W5 S+ ^% }& Y if (!isClear)
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String tmp = (String)Message_Array.getFirst();) q$ y, R. M+ P; l& {, m/ ]
for (int i = 0; i < Threader.size(); i++), \ _5 {- R% B9 [% n9 Y# c
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CreateServerThread client = (CreateServerThread)Threader.get(i);5 q3 T+ l: `. V; K
client.sendMessage(tmp);. ]+ e6 m% r/ m. K4 c" S
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Message_Array.removeFirst();
0 b4 ]. c' T: K0 m! p4 ] isClear = Message_Array.size() > 0 ? false : true;
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}
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}9 F# {. ]7 O2 T9 I
//--- CreateServerThread6 p7 n ]% }% B8 N4 f' X9 B3 J
class CreateServerThread extends Thread9 _/ I( S6 W' @3 P+ E9 Y
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private Socket client;( }8 _8 x! b6 m1 |& _2 a) @0 C' B
private BufferedReader in;
4 w2 F/ U2 |7 T private PrintWriter out;
$ S% p7 q q+ s+ s- j private String Username;
+ H, }" j' o6 h+ f public CreateServerThread(Socket s) throws IOException j0 d- V+ V) e
{
, |) j& g- J7 D% w! L1 A( [& ] client = s;' t! i* h! F$ m: i: ^
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
, n# ?2 K& G! \; x5 @5 M out = new PrintWriter(client.getOutputStream(), true);
& R1 x) G" ^& U% d9 y out.println("--- Welcome to this chatroom ---");8 Y; M7 ~3 ]$ }- {
out.println("Input your nickname:");
$ N( p" H$ [. v- \9 a' d start();
+ X) |! M3 `- n$ q) s: F }
/ r( h) n' c4 |0 r public void sendMessage(String msg)) A: a. f, _8 D- o
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out.println(msg);
% U" a9 h3 e; f5 t$ J& \$ K/ G }
K2 `7 |) }3 W9 Q public void run()5 U) M3 C$ {6 x; p" B3 {7 R, ~
{
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{
8 h4 s" ?! [1 H9 {+ p int flag = 0;
; s/ O6 p' b' d2 @ f Thread_Counter++;
! q5 `, c: H9 h: w7 ?7 H String line = in.readLine();
/ ~! }0 V' \. x while (!line.equals("bye"))
& a8 H; \# r6 U* N { d6 \% g- K' x9 A# q$ Y" x3 ?
if (line.equals("l"))
9 j0 J" [4 Q+ R: S {; |3 \( a* e+ K7 X! B j7 ]
out.println(listOnlineUsers());, v3 [5 G. q) u' j8 r- P# x0 p
line = in.readLine();
# f" f" B# G& I* H, w6 `% t continue;
2 V7 w4 x- g+ C2 l, [! a }, l. g: ^$ C( h& H% N, o
if (flag++ == 0)
2 h( Z0 z" R+ w C% u, B$ ~ {
, E7 p) x- ?4 h4 z- J; A$ i Username = line;% g3 P' {; `1 a9 b2 Y: l7 D% n' ?
User_List.add(Username);
' F* U" p# D/ T9 [ out.println(listOnlineUsers());
1 F9 r1 Q3 _; W5 P# b! r Threader.add(this);6 J: A9 y% H6 U. s/ `* N& I/ ?$ B* w
pushMessage("[< " + Username + " come on in >]");
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pushMessage("" + line);; U' n8 m8 J N& c0 j9 Z3 z* b
}
' {5 J) [0 }6 B: q+ F9 T" S line = in.readLine();) l5 d& U/ N' `& ^+ r* W
}
+ c6 E# v/ z& B8 Y out.println("--- See you, bye! ---");! O( G3 f1 ^# w- M, ?# X8 r
client.close();
" k! v) K4 y2 r2 F% q }: `7 ~& a# A) O$ Q1 K
catch (IOException e)- A$ H! k$ M" y- R+ y( H3 m7 O. K
{}
; c* T5 [- i% ^4 P" D' i. w finally
5 o; ?1 F0 r K {! e8 _" E' I0 s4 {& b' X5 k
try! W& F& y' V& @5 g& ~6 m2 n- C- C( W0 r
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client.close();
9 {. M1 F$ E* ?! _0 t }
4 \" o) K+ R$ S* e" m# ^* Q catch (IOException e)7 U& G0 u3 E' U" Q, I* Q
{}
0 W, m- O q5 j Thread_Counter--;
( V) u8 p) H* A/ s/ }4 V# D* h Threader.remove(this);' A/ H* o$ [4 p# V5 @0 |) g- }; Z
User_List.remove(Username);
: M- N0 z# u+ x! T4 `7 f9 F6 S. S pushMessage("[< " + Username + " left>]");
/ @/ [6 `9 L2 l3 t8 o7 x }4 f# F) ]2 a! E4 ^& ]
}
9 R5 A. h% a9 c. X) j& a private String listOnlineUsers()
% r5 i: \' u" Q {
& J; m; f& W. A2 e String s ="-+- online list -+-\015\012";
, ~1 g9 G' K$ k' N% D" A/ x9 c5 x) [ for (int i = 0; i < User_List.size(); i++)% @7 J. W4 E; ?
{
6 W0 K4 Y2 z) }' [6 e s += "[" + User_List.get(i) + "]\015\012";
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s += "-+---------------------+-";
" W2 [/ j y! K7 F return s;! Y0 F* T0 ^8 m0 k9 m! a9 t% `" {
}6 H. x2 ]- [# i9 W4 K. o5 O
private void pushMessage(String msg)
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Message_Array.addLast(msg);- ]% m- C- l. j" ~# X, M
isClear = false;# n; ~; E( u3 v; x/ ?
}
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screen.width-333)this.width=screen.width-333;" border=0>
C c/ V4 T7 j1 c* A& h 这就是程序运行后,多用户登陆并且输入信息后的屏幕。实现了信息的实时广播。用户输入"l"就可以列出在线人员表。 |