iOS - 需求 - 将参数进行字典排序组成字符串(待签名字符串)

来源：互联网发布：淘宝宁美国度编辑：程序博客网时间：2024/05/18 01:43

将所有POST参数（sign除外）进行字典排序，组成字符串:
比如:(根据首字母排序,参数间用&相连,字典转成json格式)

ap_id=20140723007148&biz_conte={"outTradeNo":201503201",toalAmount":"8.8",discountAmount":8.",unDiscountAmount":80",subject": 扫码支付",godsDetail": [{"godsI":"aple-01",godsName":ipad",godsCategory":78230",price":8.8",quantiy":1"}],"operatorId":"op01",storeId":pudong01",terminalId":t_01",timeExpire":"20150329101"}&charset=utf-8&method=alipay.trade.precate×tamp=2014-0724 03:750

解决办法:
1.首先传入的是参数字典.
2.获取字典的所有key
3.创建一个可变字符串
4.将key和value对应用’=’相连起来
5.其中value是字典的话,就转成json格式,再相连
6.如果有空格,换行等等的格式字符,就将其替换掉

示例:

NSMutableString *contentString  =[NSMutableString string];    NSDictionary* dict = [self convertToDict];    NSArray *keys = [dict allKeys];    //按字母顺序排序    NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {        return [obj1 compare:obj2 options:NSNumericSearch];    }];    //拼接字符串    for (NSString *categoryId in sortedArray) {        if (![categoryId isEqualToString:@"sign"] && ![categoryId isEqualToString:@"timestamp"]){            if([categoryId isEqualToString:@"biz_content"]){                NSError *error = nil;                NSDictionary* bizDict = [dict objectForKey:@"biz_content"];                NSData *jsonData = [NSJSONSerialization dataWithJSONObject:bizDict options:NSJSONWritingPrettyPrinted error: &error];                NSMutableData *tempJsonData = [NSMutableData dataWithData:jsonData];                NSString* jsonString1 = [[NSString alloc] initWithData:tempJsonData encoding:NSUTF8StringEncoding];                NSString *jsonString2 = [jsonString1 stringByReplacingOccurrencesOfString:@" : " withString:@":"];                [contentString appendFormat:@"biz_content=%@&",jsonString2];            }else{                [contentString appendFormat:@"%@=%@&", categoryId, [dict valueForKey:categoryId]];            }        }    }    //添加key字段    [contentString appendFormat:@"timestamp=%@", [dict objectForKey:@"timestamp"]];    NSString *strUrl1 = [contentString stringByReplacingOccurrencesOfString:@"  " withString:@""];//    NSString *strUrl2 = [strUrl1 stringByReplacingOccurrencesOfString:@"\t" withString:@""];    NSString *strUrl3 = [strUrl1 stringByReplacingOccurrencesOfString:@"\n" withString:@""];

上述代码中,timestamp是最后的一个key,是不用用&相连的,所以拿出来单独拼接.biz_content是一个字典,所以也单独进行判断,转成json格式进行拼接,这样就完成待签名字符串的整理了.

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