Objective-C NSURL 访问需要认证的网页 Basic Authentication

访问某些网页可能需要认证，比如JavaEye的Api。

如下方法可以做到访问这样的网页，本信息转自：

http://www.chrisumbel.com/article/basic_authentication_iphone_cocoa_touch

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首先需要一个Base64类

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@interface Base64 : NSObject {}@endstatic char *alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";@implementation Base64+ (unsigned char *)encode:(NSData *) plainText {unsigned char *outputBuffer = malloc((((([plainText length] % 3) + [plainText length]) / 3) * 4) + 1);unsigned char *inputBuffer = (unsigned char *)[plainText bytes];NSInteger i;NSInteger j = 0;int remain;for (i = 0; i < [plainText length]; i += 3){remain = [plainText length] - i;outputBuffer[j++] = alphabet[(inputBuffer[i] & 0xFC) >> 2];outputBuffer[j++] = alphabet[((inputBuffer[i] & 0x03) << 4) | ((remain > 1) ? ((inputBuffer[i+1] & 0xF0) >> 4) : 0)];if (remain > 1){outputBuffer[j++] = alphabet[((inputBuffer[i+1] & 0x0F) << 2) | ((remain > 2) ? ((inputBuffer [i+2] & 0xC0) >> 6) : 0)];}else{outputBuffer[j++] = '=';}if (remain > 2){outputBuffer[j++] = alphabet[inputBuffer[i+2] & 0x3F];}else{outputBuffer[j++] = '=';}}outputBuffer[j] = '0';return outputBuffer;}@end

?实现：

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NSURL *url = [NSURL URLWithString:@"http://api.iteye.com/api/auth/verify"];  NSString *userName = @"username";  NSString *password = @"password";  NSMutableString *loginString = (NSMutableString*)[@"" stringByAppendingFormat:@"%@:%@", userName, password];  char *encodedLoginData = [Base64 encode:[loginString dataUsingEncoding:NSUTF8StringEncoding]];  NSString *authHeader = [@"Basic " stringByAppendingFormat:@"%@",   [NSString stringWithCString:encodedLoginData  length:strlen(encodedLoginData)]];  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL: url     cachePolicy: NSURLRequestReloadIgnoringCacheData       timeoutInterval: 3];     [request addValue:authHeader forHTTPHeaderField:@"Authorization"];  NSData *returnData = [NSURLConnection sendSynchronousRequest:request   returningResponse:nil    error:nil];NSStringEncoding strEncode = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingUTF8);NSString *returnStr = [[NSString alloc] initWithData:returnData encoding:strEncode];NSLog(@"%@", returnStr);

?把username,password替换成真实的JavaEye用户信息。

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