private static IPAddress GropuAddress = IPAddress.Parse("224.0.0.2");//IPprivate static int GrupPort = 12001;//端口static void Main(string[] args){for (int i = 0; i < 1000; i++){System.Threading.Thread.Sleep(3000);//等待3秒再发Send("sendMessage"+i.ToString()+"个！");}}public static void Send(string message){

　　　　　　　　//不在一个网段也可以收到

　　　　　　　　Socket server = new Socket(AddressFamily.InterNetwork,
　　　　　　　　SocketType.Dgram, ProtocolType.Udp);
　　　　　　　　IPEndPoint iep = new IPEndPoint(IPAddress.Any, 12002);
　　　　　　　　IPEndPoint iep2 = new IPEndPoint(IPAddress.Parse("224.0.0.2"), 12001);
　　　　　　　　server.Bind(iep);

　　　　　　　　byte[] data = Encoding.ASCII.GetBytes(message);
　　　　　　　　server.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership,
　　　　　　　　new MulticastOption(IPAddress.Parse("224.100.0.1")));
　　　　　　　　server.SetSocketOption(SocketOptionLevel.IP,SocketOptionName.MulticastTimeToLive, 50);
　　　　　　　　server.SendTo(data, iep2);
　　　　　　　　server.Close();

}

        static void Main(string[] args){StartListener();           Console.ReadLine();}private static void StartListener(){byte[] b = new byte[10240];try{while (true){System.Threading.Thread.Sleep(500);String multiAddress = "224.0.0.2";//Datagrams.getMultiIPAddress("192.168.2.106");Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 12001);s.Bind(ipep);IPAddress ip = IPAddress.Parse(multiAddress);s.SetSocketOption(SocketOptionLevel.IP,SocketOptionName.AddMembership,new MulticastOption(ip, IPAddress.Any));s.ReceiveTimeout = 5000;s.Receive(b);string sss = System.Text.Encoding.UTF8.GetString(b).Replace("\0", "").Trim();Console.WriteLine(sss);s.Close();}}catch (Exception ex){Console.WriteLine("receive multicast exception:" + ex.ToString());}}

#import "AsyncUdpSocket.h"@interface ViewController : UIViewController<AsyncUdpSocketDelegate>

@property (strong, nonatomic) IBOutlet UITextField *MyResaveTxt;//页面上的文本
@property (nonatomic,strong) AsyncUdpSocket *udpSocket;
-(void)openUDPServer;

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController
@synthesize udpSocket,MyResaveTxt;
- (void)viewDidLoad
{[super viewDidLoad];[self openUDPServer];// Do any additional setup after loading the view, typically from a nib.
}- (void)didReceiveMemoryWarning
{[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}
-(void) openUDPServer
{//初始化udpAsyncUdpSocket *tempSocket=[[AsyncUdpSocket alloc] initWithDelegate:self];self.udpSocket=tempSocket;//绑定端口NSError *error = nil;[self.udpSocket bindToPort:12001 error:&error];//发送广播设置[self.udpSocket enableBroadcast:YES error:&error];//加入群里，能接收到群里其他客户端的消息[self.udpSocket joinMulticastGroup:@"224.0.0.2" error:&error];//启动接收线程[self.udpSocket receiveWithTimeout:-1 tag:0];}
//接收
-(BOOL) onUdpSocket:(AsyncUdpSocket *)sock didReceiveData:(NSData *)data withTag:(long)tag fromHost:(NSString *)host port:(UInt16)port
{NSString * info=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];MyResaveTxt.text=info;[self.udpSocket receiveWithTimeout:-1 tag:0];//启动接收线程return YES;
}
@end

byte[] data =System.Text.Encoding.Default.GetBytes(message);

 NSStringEncoding strEncode = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);NSString * info=[[NSString alloc] initWithData:data encoding:strEncode ];

    NSString *url =@"www.haha.com/这是中文";NSStringEncoding chineseEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);url = [url stringByAddingPercentEscapesUsingEncoding:chineseEncoding];NSLog(@"%@",url);

　　　　NSMutableURLRequest *request = [[NSMutableURLRequestalloc] init];

// 设置URL

[request setURL:[NSURL URLWithString:url]];

// 设置HTTP方法

[request setHTTPMethod:@"GET"];

// 发送同步请求, 这里得returnData就是返回得数据

NSData *data = [NSURLConnectionsendSynchronousRequest:request

returningResponse:nil error:nil];

- (NSString *)URLEncodedString{ NSString *result = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,(CFStringRef)self,NULL,CFSTR("!*'();:@&=+$,/?%#[]"),kCFStringEncodingUTF8);[result autorelease];return result; }