iOS自带http post、json解析、urldecode综合体验

NSString *url =@"http://ip:port/filename";
    //post提交的参数，格式：id=登录名&pwd=登录密码
    NSString *post = [NSString
                      stringWithFormat:@"id=%@&pwd=%@",@"test",@"test"];
    NSLog(@"参数:%@",post);
    //将NSSrring格式的参数转换格式为NSData，POST提交必须用NSData数据。
    NSData *postData = [post
                        dataUsingEncoding:NSUTF8StringEncoding
                        allowLossyConversion:YES];
    //计算POST提交数据的长度
    NSString *postLength = [NSString
                            stringWithFormat:@"%ld",[postData length]];
    NSLog(@"数据长度=%@",postLength);
    //定义NSMutableURLRequest
    NSMutableURLRequest *request = [[NSMutableURLRequestalloc] init];
    [request setURL:[NSURLURLWithString:url]];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/x-www-form-urlencoded"
             forHTTPHeaderField:@"Content-Type"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    //设置需要post提交的内容
    [request setHTTPBody:postData];
    NSHTTPURLResponse* urlResponse = nil;
    NSError *error = nil;
    //同步提交:POST提交并等待返回值（同步），返回值是NSData类型。
    NSData *responseData = [NSURLConnection
                            sendSynchronousRequest:request
                            returningResponse:&urlResponse
                            error:&error];
    //将NSData类型的返回值转换成NSString类型
    //NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    if (error) {
        NSLog(@"提交失败，异常信息：%@",error);
    }else{
        NSError *err = nil;
        NSDictionary *mDic = [NSJSONSerialization
                              JSONObjectWithData:responseData
                              options:NSJSONReadingMutableLeaves
                              error:&err];
        if (err) {
            NSLog(@"提交失败，反馈结果无效。");
        }else{
            NSRange range=[[mDic objectForKey:@"result"] rangeOfString:@"success"];
            if(range.location!=NSNotFound) {
                NSLog(@"字典内容:%@", mDic);
                NSLog(@"余额:%@", [mDic objectForKey:@"Balance"]);
                NSArray *contentLenght=[mDic objectForKey:@"ContentLenght"];
                NSLog(@"内容长度限制（上限）:%@", contentLenght[0]);
                NSLog(@"内容长度限制（单条）:%@", contentLenght[1]);
                NSLog(@"内容长度限制（多条）:%@", contentLenght[2]);
                NSLog(@"用户:%@",
                      CFURLCreateStringByReplacingPercentEscapesUsingEncoding(
                                                                              kCFAllocatorDefault,
                                                                              (CFStringRef)[mDic objectForKey:@"User"],
                                                                              (CFStringRef)@"!$&'()*+,-./:;=?@_~%#[]",
                                                                              kCFStringEncodingGB_18030_2000));
                //这里获取到的是gbk的，所以urldecode解析gbk，而不是utf8
                NSLog(@"提交成功:%@", [mDic objectForKey:@"result"]);
            }else{
                NSLog(@"提交失败:%@", [mDic objectForKey:@"result"]);
            }
            
        }
    }

反馈结果：

参数:id=test&pwd=test
数据长度=16
字典内容:{
    Balance = 0;
    ContentLenght =     (
        240,
        67,
        60
    );
    User = "%B2%E2%CA%D4";
    result = success;
}
余额:0
内容长度限制（上限）:240
内容长度限制（单条）:67
内容长度限制（多条）:60
用户:测试
提交成功:success