iphone开发 http post get

1、get的方式：

1. NSString *queryString =  
2.           [NSString stringWithFormat:  
3.     @“http://itunes.apple.com/search?term=TacTraHD&entity=software];  
4.     NSURL *url = [NSURL URLWithString:queryString];  
5.     NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];  
6.     [req addValue:@“text/xml; charset=utf-8” forHTTPHeaderField:@“Content-Type”];  
7.     [req addValue:0 forHTTPHeaderField:@“Content-Length”];  
8.     [req setHTTPMethod:@“GET”];  
9.     [activityIndicator startAnimating];  
10.     conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];  
11.     if (conn) {  
12.         webData = [[NSMutableData data] retain];  
13.     } 

2、post的方式：

1. NSString *postString =@"123";    
2.     NSURL *url = [NSURL URLWithString:    
3. @“http://itunes.apple.com/search?term=TacTraHD&entity=software”];    
4.     NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];    
5.     NSString *msgLength = [NSString stringWithFormat:@“%d”, [postString length]];    
6.     [req addValue:@“application/x-www-form-urlencoded”    
7.         forHTTPHeaderField:@“Content-Type”];    
8.     [req addValue:msgLength forHTTPHeaderField:@“Content-Length”];   
9.     [req setHTTPMethod:@“POST”];   
10.     [req setHTTPBody: [postString dataUsingEncoding:NSUTF8StringEncoding]];   
11.     [activityIndicator startAnimating];  
12.     conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];  
13.     if (conn) {    
14.         webData = [[NSMutableData data] retain];    
15.     }