在Swift开发中,如果我们需要保持客服端和服务器的长连接进行双向的数据通信,使用socket是一种很好的解决方案。
下面通过一个聊天室的样例来演示socket通信,这里我们使用了一个封装好的socket库(SwiftSocket)。
功能如下:
1,程序包含服务端和客服端,这里为便于调试把服务端和客服端都做到一个应用中
2,程序启动时,自动初始化启动服务端,并在后台开启一个线程等待客服端连接
3,同时,客户端初始化完毕后会与服务端进行连接,同时也在后台开启一个线程等待接收服务端发送的消息
4,连接成功后,自动生成一个随机的用户名(如“游客232”)并发送消息告诉服务器这个用户信息
5,点击界面的“发送消息”按钮,则会发送聊天消息到服务端,服务端收到后会把聊天消息发给所有的客服端。客服端收到后显示在对话列表中
注意:消息传递过程使用的json格式数据。
目前这个demo里消息种类有用户登录消息,聊天消息,后面还可以加上用户退出消息等。为了在接收到消息以后,能判断是要执行什么命令。我们创
建消息体的时候使用字典NSDictionary(其中cmd表示命令类型,content表示内容体),发送消息时把字典转成json串传递,当另一端
接收的时候,又把json串还原成字典再执行响应的动作。
建消息体的时候使用字典NSDictionary(其中cmd表示命令类型,content表示内容体),发送消息时把字典转成json串传递,当另一端
接收的时候,又把json串还原成字典再执行响应的动作。
效果图如下:
代码如下:
--- ViewController.swift 主页面 ---
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|
import UIKit
class ViewController : UIViewController {
//消息输入框
@IBOutlet weak var textFiled: UITextField !
//消息输出列表
@IBOutlet weak var textView: UITextView !
//socket服务端封装类对象
var socketServer: MyTcpSocketServer ?
//socket客户端类对象
var socketClient: TCPClient ?
override func viewDidLoad() {
super .viewDidLoad()
//启动服务器
socketServer = MyTcpSocketServer ()
socketServer?.start()
//初始化客户端,并连接服务器
processClientSocket()
}
//初始化客户端,并连接服务器
func processClientSocket(){
socketClient= TCPClient (addr: "localhost" , port: 8080)
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_BACKGROUND , 0), {
() -> Void in
//用于读取并解析服务端发来的消息
func readmsg()-> NSDictionary ?{
//read 4 byte int as type
if let data= self .socketClient!.read(4){
if data.count==4{
var ndata= NSData (bytes: data, length: data.count)
var len: Int32 =0
ndata.getBytes(&len, length: data.count)
if let buff= self .socketClient!.read( Int (len)){
var msgd: NSData = NSData (bytes: buff, length: buff.count)
var msgi: NSDictionary = NSJSONSerialization . JSONObjectWithData (
msgd,
options: . MutableContainers , error: nil ) as ! NSDictionary
return msgi
}
}
}
return nil
}
//连接服务器
var (success,msg)= self .socketClient!.connect(timeout: 5)
if success{
dispatch_async(dispatch_get_main_queue(), {
self .alert( "connect success" , after: {
})
})
//发送用户名给服务器(这里使用随机生成的)
var msgtosend=[ "cmd" : "nickname" , "nickname" : "游客\(Int(arc4random()%1000))" ]
self .sendMessage(msgtosend)
//不断接收服务器发来的消息
while true {
if let msg=readmsg(){
dispatch_async(dispatch_get_main_queue(), {
self .processMessage(msg)
})
} else {
dispatch_async(dispatch_get_main_queue(), {
//self.disconnect()
})
break
}
}
} else {
dispatch_async(dispatch_get_main_queue(), {
self .alert(msg,after: {
})
})
}
})
}
//“发送消息”按钮点击
@IBAction func sendMsg(sender: AnyObject ) {
var content=textFiled.text
var message=[ "cmd" : "msg" , "content" :content]
self .sendMessage(message)
textFiled.text= nil
}
//发送消息
func sendMessage(msgtosend: NSDictionary ){
var msgdata= NSJSONSerialization .dataWithJSONObject(msgtosend,
options: NSJSONWritingOptions . PrettyPrinted , error: nil )
var len: Int32 = Int32 (msgdata!.length)
var data: NSMutableData = NSMutableData (bytes: &len, length: 4)
self .socketClient!.send(data: data)
self .socketClient!.send(data:msgdata!)
}
//处理服务器返回的消息
func processMessage(msg: NSDictionary ){
var cmd: String =msg[ "cmd" ] as ! String
switch (cmd){
case "msg" :
self .textView.text = self .textView.text +
(msg[ "from" ] as ! String ) + ": " + (msg[ "content" ] as ! String ) + "\n"
default :
println (msg)
}
}
//弹出消息框
func alert(msg: String ,after:()->( Void )){
var alertview= UIAlertView (title: "" , message: msg, delegate: nil ,
cancelButtonTitle: nil )
alertview.show()
dispatch_after(dispatch_time( DISPATCH_TIME_NOW , 3), dispatch_get_main_queue(),{
alertview.dismissWithClickedButtonIndex(0, animated: true )
after()
})
}
override func didReceiveMemoryWarning() {
super .didReceiveMemoryWarning()
}
} |
--- MyTcpSocketServer.swift 服务端 ---
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|
import UIKit
//服务器端口 var serverport = 8080
//客户端管理类(便于服务端管理所有连接的客户端) class ChatUser : NSObject {
var tcpClient: TCPClient ?
var username: String = ""
var socketServer: MyTcpSocketServer ?
//解析收到的消息
func readMsg()-> NSDictionary ?{
//read 4 byte int as type
if let data= self .tcpClient!.read(4){
if data.count==4{
var ndata= NSData (bytes: data, length: data.count)
var len: Int32 =0
ndata.getBytes(&len, length: data.count)
if let buff= self .tcpClient!.read( Int (len)){
var msgd: NSData = NSData (bytes: buff, length: buff.count)
var msgi: NSDictionary = NSJSONSerialization . JSONObjectWithData (msgd,
options: . MutableContainers , error: nil ) as ! NSDictionary
return msgi
}
}
}
return nil
}
//循环接收消息
func messageloop(){
while true {
if let msg= self .readMsg(){
self .processMsg(msg)
} else {
self .removeme()
break
}
}
}
//处理收到的消息
func processMsg(msg: NSDictionary ){
if msg[ "cmd" ] as ! String == "nickname" {
self .username=msg[ "nickname" ] as ! String
}
self .socketServer!.processUserMsg(user: self , msg: msg)
}
//发送消息
func sendMsg(msg: NSDictionary ){
var jsondata= NSJSONSerialization .dataWithJSONObject(msg, options:
NSJSONWritingOptions . PrettyPrinted , error: nil )
var len: Int32 = Int32 (jsondata!.length)
var data: NSMutableData = NSMutableData (bytes: &len, length: 4)
self .tcpClient!.send(data: data)
self .tcpClient!.send(data: jsondata!)
}
//移除该客户端
func removeme(){
self .socketServer!.removeUser( self )
}
//关闭连接
func kill(){
self .tcpClient!.close()
}
} //服务端类 class MyTcpSocketServer : NSObject {
var clients:[ ChatUser ]=[]
var server: TCPServer = TCPServer (addr: "127.0.0.1" , port: serverport)
var serverRuning: Bool = false
//启动服务
func start() {
server.listen()
self .serverRuning= true
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_BACKGROUND , 0), {
while self .serverRuning{
var client= self .server.accept()
if let c=client{
dispatch_async(
dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_BACKGROUND , 0), {
self .handleClient(c)
})
}
}
})
self .log( "server started..." )
}
//停止服务
func stop() {
self .serverRuning= false
self .server.close()
//forth close all client socket
for c: ChatUser in self .clients{
c.kill()
}
self .log( "server stoped..." )
}
//处理连接的客户端
func handleClient(c: TCPClient ){
self .log( "new client from:" +c.addr)
var u= ChatUser ()
u.tcpClient=c
clients.append(u)
u.socketServer= self
u.messageloop()
}
//处理各消息命令
func processUserMsg(user u: ChatUser ,msg m: NSDictionary ){
self .log( "\(u.username)[\(u.tcpClient!.addr)]cmd:" +(m[ "cmd" ] as ! String ))
//boardcast message
var msgtosend=[ String : String ]()
var cmd = m[ "cmd" ] as ! String
if cmd== "nickname" {
msgtosend[ "cmd" ]= "join"
msgtosend[ "nickname" ]=u.username
msgtosend[ "addr" ]=u.tcpClient!.addr
} else if (cmd== "msg" ){
msgtosend[ "cmd" ]= "msg"
msgtosend[ "from" ]=u.username
msgtosend[ "content" ]=(m[ "content" ] as ! String )
} else if (cmd== "leave" ){
msgtosend[ "cmd" ]= "leave"
msgtosend[ "nickname" ]=u.username
msgtosend[ "addr" ]=u.tcpClient!.addr
}
for user: ChatUser in self .clients{
//if u~=user{
user.sendMsg(msgtosend)
//}
}
}
//移除用户
func removeUser(u: ChatUser ){
self .log( "remove user\(u.tcpClient!.addr)" )
if let possibleIndex= find ( self .clients, u){
self .clients.removeAtIndex(possibleIndex)
self .processUserMsg(user: u, msg: [ "cmd" : "leave" ])
}
}
//日志打印
func log(msg: String ){
println (msg)
}
} |
源码下载:SocketTest.zip