http://blog.csdn.NET/gf771115/article/details/7729864
假如你也是一个Java程序员，而你又不是很懂Socket。
下面我的这篇文章也许能帮助你一些。
http://xiva.iteye.com/blog/993336
首先我们写好上面文章中的server端。
下面我们可以访问一下下面的地址：
http://code.google.com/p/cocoaasyncsocket/
这是一个开源框架。呵，不知道拿到自己程序中使用是否涉及侵权。
但是这句话“The CocoaAsyncSocket project is in the public domain.”是我有信心使用它们的源码，否则只能自己用c来写了，或者使用CFSocket、CFNetwork等类自己来写了。不过也无妨，应在在使用线程的情况下，我们也是可以实现的。
总之，为了开发的便捷，我使用了AsyncSocket这个类，这样可以异步通信。
建立一个基于视图的应用程序，按照http://code.google.com/p/cocoaasyncsocket/wiki/Reference_AsyncSocket
我们AsyncSocket.h和AsyncSocket.m到我们的项目中，并且导入CFNetwork.framework。这样基本准备工作就做好了。
下面提供我的应用中的代码以及界面图：
Socketdemoviewcontroller.h代码 // // SocketDemoViewController.h // SocketDemo // // Created by xiang xiva on 10-7-10. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import <UIKit/UIKit.h> #import "AsyncSocket.h" #define SRV_CONNECTED 0 #define SRV_CONNECT_SUC 1 #define SRV_CONNECT_FAIL 2 #define HOST_IP @"192.168.110.1" #define HOST_PORT 8080 @interface SocketDemoViewController : UIViewController { UITextField *inputMsg; UILabel *outputMsg; AsyncSocket *client; } @property (nonatomic, retain) AsyncSocket *client; @property (nonatomic, retain) IBOutlet UITextField *inputMsg; @property (nonatomic, retain) IBOutlet UILabel *outputMsg; - (int) connectServer: (NSString *) hostIP port:(int) hostPort; - (void) showMessage:(NSString *) msg; - (IBAction) sendMsg; - (IBAction) reConnect; - (IBAction) textFieldDoneEditing:(id)sender; - (IBAction) backgroundTouch:(id)sender; @end
socketdemoviewcontroller.m代码 // // SocketDemoViewController.m // SocketDemo // // Created by xiang xiva on 10-7-10. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import "SocketDemoViewController.h" @implementation SocketDemoViewController @synthesize inputMsg, outputMsg; @synthesize client; /* // The designated initializer. Override to perform setup that is required before the view is loaded. - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } */ /* // Implement loadView to create a view hierarchy programmatically, without using a nib. - (void)loadView { } */ // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { //[super viewDidLoad]; [self connectServer:HOST_IP port:HOST_PORT]; //监听读取 } // Override to allow orientations other than the default portrait orientation. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidUnload { self.client = nil; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (int) connectServer: (NSString *) hostIP port:(int) hostPort{ if (client == nil) { client = [[AsyncSocket alloc] initWithDelegate:self]; NSError *err = nil; //192.168.110.128 if (![client connectToHost:hostIP onPort:hostPort error:&err]) { NSLog(@"%@ %@", [err code], [err localizedDescription]); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[@"Connection failed to host " stringByAppendingString:hostIP] message:[[[NSString alloc]initWithFormat:@"%@",[err code]] stringByAppendingString:[err localizedDescription]] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; //client = nil; return SRV_CONNECT_FAIL; } else { NSLog(@"Conectou!"); return SRV_CONNECT_SUC; } } else { [client readDataWithTimeout:-1 tag:0]; return SRV_CONNECTED; } } - (IBAction) reConnect{ int stat = [self connectServer:HOST_IP port:HOST_PORT]; switch (stat) { case SRV_CONNECT_SUC: [self showMessage:@"connect success"]; break; case SRV_CONNECTED: [self showMessage:@"It's connected,don't agian"]; break; default: break; } } - (IBAction) sendMsg{ NSString *inputMsgStr = self.inputMsg.text; NSString * content = [inputMsgStr stringByAppendingString:@"\r\n"]; NSLog(@"%a",content); NSData *data = [content dataUsingEncoding:NSISOLatin1StringEncoding]; [client writeData:data withTimeout:-1 tag:0]; //[data release]; //[content release]; //[inputMsgStr release]; //继续监听读取 //[client readDataWithTimeout:-1 tag:0]; } #pragma mark - #pragma mark close Keyboard - (IBAction) textFieldDoneEditing:(id)sender{ [sender resignFirstResponder]; } - (IBAction) backgroundTouch:(id)sender{ [inputMsg resignFirstResponder]; } #pragma mark socket uitl - (void) showMessage:(NSString *) msg{ UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"Alert!" message:msg delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; } #pragma mark socket delegate - (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port{ [client readDataWithTimeout:-1 tag:0]; } - (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err { NSLog(@"Error"); } - (void)onSocketDidDisconnect:(AsyncSocket *)sock { NSString *msg = @"Sorry this connect is failure"; [self showMessage:msg]; [msg release]; client = nil; } - (void)onSocketDidSecure:(AsyncSocket *)sock{ } - (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{ NSString* aStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"Hava received datas is :%@",aStr); self.outputMsg.text = aStr; [aStr release]; [client readDataWithTimeout:-1 tag:0]; } #pragma mark dealloc - (void)dealloc { [client release]; [inputMsg release]; [outputMsg release]; [super dealloc]; } @end
还是先给出我的界面吧，否则很难懂这些代码
这样大家满意了吧！
好了说了这么多我们还是来看看代码究竟怎么回事吧。
首先从头文件开始看吧，
1，导入头文件#import "AsyncSocket.h"，然后是一些宏
2，声明一个AsyncSocket对象，其他就是一些IBoutlet
再次我们看看视图加载，
Java代码 - (void)viewDidLoad { //[super viewDidLoad]; [self connectServer:HOST_IP port:HOST_PORT]; //监听读取 } 显然我们调用了connectServer::这个方法。
在这个方法中，首先初始化我们的对象，使用代理的方式。对象显示是self。然后我们便需在我们的类中实现它的各种方法，来得到各种我们想得到的。
client = [[AsyncSocket alloc] initWithDelegate:self];
下面就是连接服务器了，
[client connectToHost:hostIP onPort:hostPort error:&err]
并且当client不为空时，我们就读取服务器的信息
[client readDataWithTimeout:-1 tag:0];
Java代码 - (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{ NSString* aStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"Hava received datas is :%@",aStr); self.outputMsg.text = aStr; [aStr release]; [client readDataWithTimeout:-1 tag:0]; }
在这个方法中很耐人寻味，主要就是在于递归的调用。
Sendmsg代码 - (IBAction) sendMsg{ NSString *inputMsgStr = self.inputMsg.text; NSString * content = [inputMsgStr stringByAppendingString:@"\r\n"]; NSLog(@"%a",content); NSData *data = [content dataUsingEncoding:NSISOLatin1StringEncoding]; [client writeData:data withTimeout:-1 tag:0]; }
我们在看看上面发送消息的代码，中的在于"\r\n"的拼接，否则在java端的程序，无法知道你发过来的信息是否结束，当然你也可以使用其他的方式来读取客户端，比如定时；但是我在java端写的server是readLine来判断的，所以需要拼接这个\r\n.
其他的代码除了asyncSocket代理外都是我们所熟悉的。
这些都是asyncsocket代理的代码 - (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port{ [client readDataWithTimeout:-1 tag:0]; } - (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err { NSLog(@"Error"); } - (void)onSocketDidDisconnect:(AsyncSocket *)sock { NSString *msg = @"Sorry this connect is failure"; [self showMessage:msg]; [msg release]; client = nil; } - (void)onSocketDidSecure:(AsyncSocket *)sock{ } - (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{ NSString* aStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"Hava received datas is :%@",aStr); self.outputMsg.text = aStr; [aStr release]; [client readDataWithTimeout:-1 tag:0]; }
到此就结束了。
