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编码和解码及MD5加密
常在一些网站源码中看到&#x开头的内容，这是转化成unicode编码后的汉字。
--------------------------------------------unicode编码后的汉字(呵呵)转化成中文(呵呵)---------------------------------------
step1：unicode解码(呵呵 ---------------- \u5475\u5475)
+(NSString *)change:(NSString *)str{ NSString *changeStr = @""; if (!str||[str isEqualToString:@""]) { return @""; } changeStr = [str stringByReplacingOccurrencesOfString:@"&#x" withString:@"\\u"]; changeStr = [changeStr stringByReplacingOccurrencesOfString:@";" withString:@""]; return changeStr;}
step2：unicode转UTF-8(\u5475\u5475 ---------------- 呵呵)
+(NSString *) unicodeToUtf8:(NSString *)string{ NSString *tempStr1 = [string stringByReplacingOccurrencesOfString:@"\\u" withString:@"\\U"]; NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""]; NSString *tempStr3 = [[@"\"" stringByAppendingString:tempStr2] stringByAppendingString:@"\""]; NSData *tempData =http://www.mamicode.com/ [tempStr3 dataUsingEncoding:NSUTF8StringEncoding]; NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData mutabilityOption:NSPropertyListImmutable format:NULL errorDescription:NULL]; return [returnStr stringByReplacingOccurrencesOfString:@"\\r\\n" withString:@"\n"];}
------------------------------------------------------------UrlEncode--------------------------------------------------
对UTF-8中文UrlEncode编码（呵呵------------------------%e5%91%b5%e5%91%b5）
- (NSString *)URLEncodedString{ NSString *encodedString = (NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)self, (CFStringRef)@"!$&‘()*+,-./:;=?@_~%#[]", NULL, kCFStringEncodingUTF8); return encodedString;}- (NSString*)URLDecodedString{ NSString *result = ( NSString *) CFBridgingRelease(CFURLCreateStringByReplacingPercentEscapesUsingEncoding(kCFAllocatorDefault, (CFStringRef)self, CFSTR(""), kCFStringEncodingUTF8)); return result;}
对gb2312中文UrlEncode编码（呵呵-----------------------%ba%c7%ba%c7）
MD5加密
#import "CommonCrypto/CommonDigest.h"@implementation MD5+(NSString *) md5: (NSString *) inPutText{ const char *cStr = [inPutText UTF8String]; unsigned char result[CC_MD5_DIGEST_LENGTH]; CC_MD5(cStr, strlen(cStr), result); return [[NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15] ] lowercaseString];}+(NSString *) MD5: (NSString *) inPutText{ const char *cStr = [inPutText UTF8String]; unsigned char result[CC_MD5_DIGEST_LENGTH]; CC_MD5(cStr, strlen(cStr), result); return [[NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15] ] uppercaseString];}
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