ASIHTTPRequest 是一个直接在CFNetwork上做的开源项目，提供了一个比官方更方便更强大的HTTP网络传输的封装。它的特色功能如下：

1，下载的数据直接保存到内存或文件系统里

2，提供直接提交(HTTP POST)文件的API

3，可以直接访问与修改HTTP请求与响应HEADER

4，轻松获取上传与下载的进度信息

5，异步请求与队列，自动管理上传与下载队列管理机

6，认证与授权的支持

7，Cookie

8，请求与响应的GZIP

9，代理请求

源码：http://www.jinhusns.com/Products/Download/?type=xcj

下面来两个ASIHTTPRequest的小例子：

NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

[request start];

NSError *error = [request error];

if (!error) {

NSString *response = [request responseString];

}

当你需要添加更多的请求信息时，如，添加个请求Header：

[request addRequestHeader:@"name" value:@"Jory lee"];

添加Post请求时的健值:

[request setPostValue:@"Ben" forKey:@"first_name"];

[request setPostValue:@"Copsey" forKey:@"last_name"];

[request setFile:@"/Users/ben/Desktop/ben.jpg" forKey:@"photo"];

设置HTTP的授权帐号：

[request setUsername:@"username"];

[request setPassword:@"password"];

一个异步请求：

- (IBAction)grabURLInBackground:(id)sender

{

NSURL *url = [NSURL URLWithString:@"http://allseeing-i.com"];

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

[request setDelegate:self];

[request startAsynchronous];

}

- (void)requestFinished:(ASIHTTPRequest *)request

{

// Use when fetching text data

NSString *responseString = [request responseString];

// Use when fetching binary data

NSData *responseData = [request responseData];

}

- (void)requestFailed:(ASIHTTPRequest *)request

{

NSError *error = [request error];

}

在我们数据获取的过程中，如果数据源复杂，一个请求队列是必不可少的：

- (IBAction)grabURLInTheBackground:(id)sender

{

if (![self queue]) {

[self setQueue:[[[NSOperationQueue alloc] init] autorelease]];

}

NSURL *url = [NSURL URLWithString:@"http://allseeing-i.com"];

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

[request setDelegate:self];

[request setDidFinishSelector:@selector(requestDone:)];

[request setDidFailSelector:@selector(requestWentWrong:)];

[[self queue] addOperation:request]; //queue is an NSOperationQueue

}

- (void)requestDone:(ASIHTTPRequest *)request

{

NSString *response = [request responseString];

}

- (void)requestWentWrong:(ASIHTTPRequest *)request

{

NSError *error = [request error];

}

另外大家可以通过下面这个代码例子，看 ASIHTTP 比传统的 post 方法的方便之处

post用法

NSString *post = @"这里放要传递的参数";

NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];

[request setURL:[NSURL URLWithString:@"请求地址"]];

[request setHTTPMethod:@"POST"];

[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

//[request addValue:@"gzip" forHTTPHeaderField:@"Accepts-Encoding"];

[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

[request setHTTPBody:postData];

NSURLConnection *conn=[[NSURLConnection alloc] initWithRequest:request delegate:self];

if (conn)

{

receivedbData = [[NSMutableData data] retain];

}

else

{

// inform the user that the download could not be made

}

ASIHTTP 方法

NSURL *url = [NSURL URLWithString:@"请求地址"];

//ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

ASIFormDataRequest *request=[ASIFormDataRequest requestWithURL:url];

[request setPostValue:@"值" forKey:@"参数1"];

[request setPostValue:@"值" forKey:@"参数2"];

[request start];

NSError *error = [request error];

if (!error) {

NSString *response = [request responseString];

NSLog(response);

}

相比之下，ASIHTTP 的确省了很多代码。