原文：http://blog.sina.com.cn/s/blog_68661bd80101njdo.html
//获取当前系统的时间戳
+(long)getTimeSp{
long time;
NSDate *fromdate=[NSDate date];
time=(long)[fromdate timeIntervalSince1970];
return time;
}
//将时间戳转换成NSDate
+(NSDate *)changeSpToTime:(NSString*)spString{
NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:[spString intValue]];
return confromTimesp;
}
//将时间戳转换成NSDate,加上时区偏移
+(NSDate*)zoneChange:(NSString*)spString{
NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:[spString intValue]];
NSTimeZone *zone = [NSTimeZone systemTimeZone];
NSInteger interval = [zone secondsFromGMTForDate:confromTimesp];
NSDate *localeDate = [confromTimesp dateByAddingTimeInterval: interval];
return localeDate;
}
//比较给定NSDate与当前时间的时间差，返回相差的秒数
+(long)timeDifference:(NSDate *)date{
NSDate *localeDate = [NSDate date];
long difference =fabs([localeDate timeIntervalSinceDate:date]);
return difference;
}
//将NSDate按yyyy-MM-dd HH:mm:ss格式时间输出
+(NSString*)nsdateToString:(NSDate *)date{
NSDateFormatter *dateFormat=[[NSDateFormatter alloc]init];
[dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString* string=[dateFormat stringFromDate:date];
return string;
}
//将yyyy-MM-dd HH:mm:ss格式时间转换成时间戳
+(long)changeTimeToTimeSp:(NSString *)timeStr{
long time;
NSDateFormatter *format=[[NSDateFormatter alloc] init];
[format setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *fromdate=[format dateFromString:timeStr];
time= (long)[fromdate timeIntervalSince1970];
[format release];
return time;
}
//获取当前系统的yyyy-MM-dd HH:mm:ss格式时间
+(NSString *)getTime{
NSDate *fromdate=[NSDate date];
NSDateFormatter *dateFormat=[[NSDateFormatter alloc]init];
[dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString* string=[dateFormat stringFromDate:fromdate];
return string;
}
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//发送数据时,16进制数－>Byte数组->NSData,加上校验码部分
+(NSData *)hexToByteToNSData:(NSString *)str{
int j=0;
Byte bytes[[str length]/2];
for(int i=0;i<[str length];i++)
{
int int_ch; ///两位16进制数转化后的10进制数
unichar hex_char1 = [str characterAtIndex:i]; ////两位16进制数中的第一位(高位*16)
int int_ch1;
if(hex_char1 >= '0' && hex_char1 <='9')
int_ch1 = (hex_char1-48)*16; //// 0 的Ascll - 48
else if(hex_char1 >= 'A' && hex_char1 <='F')
int_ch1 = (hex_char1-55)*16; //// A 的Ascll - 65
else
int_ch1 = (hex_char1-87)*16; //// a 的Ascll - 97
i++;
unichar hex_char2 = [str characterAtIndex:i]; ///两位16进制数中的第二位(低位)
int int_ch2;
if(hex_char2 >= '0' && hex_char2 <='9')
int_ch2 = (hex_char2-48); //// 0 的Ascll - 48
else if(hex_char2 >= 'A' && hex_char2 <='F')
int_ch2 = hex_char2-55; //// A 的Ascll - 65
else
int_ch2 = hex_char2-87; //// a 的Ascll - 97
int_ch = int_ch1+int_ch2;
bytes[j] = int_ch; ///将转化后的数放入Byte数组里
// if (j==[str length]/2-2) {
// int k=2;
// int_ch=bytes[0]^bytes[1];
// while (k
// int_ch=int_ch^bytes[k];
// k++;
// }
// bytes[j] = int_ch;
// }
j++;
}
NSData *newData = [[NSData alloc] initWithBytes:bytes length:[str length]/2 ];
NSLog(@"%@",newData);
return newData;
}
//接收数据时,NSData－>Byte数组->16进制数
+(NSString *)NSDataToByteTohex:(NSData *)data{
Byte *bytes = (Byte *)[data bytes];
NSString *hexStr=@"";
for(int i=0;i<[data length];i++)
{
NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数
if([newHexStr length]==1)
hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
else
hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
}
NSLog(@"hexStr:%@",hexStr);
return hexStr;
}
//将汉字字符串转换成16进制字符串
+(NSString *)chineseToHex:(NSString*)chineseStr{
NSStringEncoding encodingGB18030= CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
NSData *responseData =[chineseStr dataUsingEncoding:encodingGB18030 ];
NSString *string=[sendSocket NSDataToByteTohex:responseData];
return string;
}
//将汉字字符串转换成UTF8字符串
+(NSString *)chineseToUTf8Str:(NSString*)chineseStr{
NSStringEncoding encodingUTF8 = NSUTF8StringEncoding;
NSData *responseData2 =[chineseStr dataUsingEncoding:encodingUTF8 ];
NSString *string=[sendSocket NSDataToByteTohex:responseData2];
return string;
}
//将十六进制字符串转换成汉字
+(NSString*)changeLanguage:(NSString*)chinese{
NSString *strResult;
NSLog(@"chinese:%@",chinese);
if (chinese.length%2==0) {
//第二次转换
NSData *newData = [sendSocket hexToByteToNSData:chinese];
unsigned long encode = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
strResult = [[NSString alloc] initWithData:newData encoding:encode];
NSLog(@"strResult:%@",strResult);
}else{
NSString *strResult = @"已假定是汉字的转换，所传字符串的长度必须是4的倍数!";
NSLog(@"%@",strResult);
return NULL;
}
return strResult;
}
/////////////GBK,汉字，GB2312,ASCII码，UTF8,UTF16
//UTF8字符串转换成汉字
+(NSString*)changeLanguageUTF8:(NSString*)chinese{
NSString *strResult;
NSData *data=[sendSocket hexToByteToNSData:chinese];
strResult=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
return strResult;
}
//将十六进制数转换成十进制
-(NSString *)ToHex:(int)tmpid
{
NSLog(@"tmpid:%d",tmpid);
NSString *nLetterValue;
NSString *str =@"";
int ttmpig;
for (int i = 0; i<9; i++) {
ttmpig=tmpid;
tmpid=tmpid/16;
switch (ttmpig)
{
case 10:
nLetterValue =@"A";break;
case 11:
nLetterValue =@"B";break;
case 12:
nLetterValue =@"C";break;
case 13:
nLetterValue =@"D";break;
case 14:
nLetterValue =@"E";break;
case 15:
nLetterValue =@"F";break;
default:nLetterValue=[[NSString alloc]initWithFormat:@"%i",ttmpig];
}
str = [nLetterValue stringByAppendingString:str];
NSLog(@"str:%@",str);
if (tmpid == 0) {
break;
}
}
return str;
}
//Unicode转化为汉字
+ (NSString *)replaceUnicode1:(NSString *)unicodeStr {
NSString *tempStr1 = [unicodeStr stringByReplacingOccurrencesOfString:@"\u"withString:@"\U"];
NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"""withString:@"\""];
NSString *tempStr3 = [[@"""stringByAppendingString:tempStr2]stringByAppendingString:@"""];
NSData *tempData = [tempStr3 dataUsingEncoding:NSUTF8StringEncoding];
NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData mutabilityOption:NSPropertyListImmutable format:NULL errorDescription:NULL];
return [returnStr stringByReplacingOccurrencesOfString:@"\r\n"withString:@"
"];
}
//iso8859－1 到 unicode编码转换
+ (NSString *)changeISO88591StringToUnicodeString:(NSString *)iso88591String
{
NSMutableString *srcString = [[[NSMutableString alloc]initWithString:iso88591String] autorelease];
[srcString replaceOccurrencesOfString:@"&" withString:@"&" options:NSLiteralSearch range:NSMakeRange(0, [srcString length])];
[srcString replaceOccurrencesOfString:@"