ios HTTP post and get

在ios使用http post方法：

      NSString *post = @"did=abc&uid=王大明&score=0.3,0.4,0.5,1.1,1.4";

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

        

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

        

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

        [request setURL:[NSURL URLWithString:@"http://greenevent2.sunlight.tw/putdata2.asp"]];

        [request setHTTPMethod:@"POST"];

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

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

        [request setHTTPBody:postData];

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

        if (conn)

        {

            receivedData = [NSMutableData data];

        }

        else

        {    

        }

在ios使用http get方法：

NSURL *apiUrl = [NSURL URLWithString:@"http://greenevent2.sunlight.tw/putdata.asp?did=abc&uid=%E7%8E%8B%E5%A4%A7%E6%98%8E&score=0.3,0.4,0.5,1.1,1.4"];

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

[request setURL: apiUrl];

[request setHTTPMethod:@"GET"];

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

if (conn)

{

   receivedData = [NSMutableData data];

}

Delegate方法：

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

    NSLog(@"response");

    [receivedData setLength:0];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)d {

    [receivedData appendData:d];

    NSLog(@"didReceiveData");

    NSString* newStr = [[NSString alloc] initWithData:receivedData

                                             encoding:NSUTF8StringEncoding];

    NSLog(@"returnData:%@",newStr);

    //NSLog(@"receivedData:%@",receivedData);

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

    [[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Error", @"")

                                 message:[error localizedDescription]

                                delegate:nil

                       cancelButtonTitle:NSLocalizedString(@"OK", @"")

                       otherButtonTitles:nil] show];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    NSLog(@"connectionDidFinishLoading");

    /*

    NSString *responseText = [[NSString alloc] initWithData:self.data encoding:NSUTF8StringEncoding];

    

    // Do anything you want with it

    

    [responseText release];

     */

}

// Handle basic authentication challenge if needed

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {

    NSString *username = @"username";

    NSString *password = @"password";

    

    NSURLCredential *credential = [NSURLCredential credentialWithUser:username

                                                             password:password

                                                          persistence:NSURLCredentialPersistenceForSession];

    [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];

}

同步方式

1. 
   NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];           
2. 
   
3. [request setURL:[NSURL URLWithString:urlStr]];  
4. 
   
5. [request setHTTPMethod:@"GET"];  
6. 
   
7. NSData *returnData = [NSURLConnection sendSynchronousRequest:request   
8.                                            returningResponse:nil error:nil];   
9.   
10. [request release];