强大的HTTP包装开源项目ASIHTTPRequest介绍

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。