IOS开发之Post 方式获取服务器数据

//1.创建post方式的 参数字符串url
+(NSString *)createPostURL:(NSMutableDictionary *)params
{
    NSString *postString=@"";
    for(NSString *key in [params allKeys])
    {
        NSString *value=[params objectForKey:key];
        postString=[postString stringByAppendingFormat:@"%@=%@&",key,value];
    }
    if([postString length]>1)
    {
        postString=[postString substringToIndex:[postString length]-1];
    }
    return postString;
}

 
 
//2.zwh -自定义的通用方法－－－－－－post数据回服务器，并返回结果数据集
+(NSData *)getResultDataByPost:(NSMutableDictionary *)params
{
 
    NSString *postURL=[Utility createPostURL:params];
    NSError *error;
    NSURLResponse *theResponse;
    NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:BASEURL]];
    [theRequest setHTTPMethod:@"POST"];
    [theRequest setHTTPBody:[postURL dataUsingEncoding:NSUTF8StringEncoding]];
    [theRequest addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    return [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&theResponse error:&error];
}
 ／／调用实例代码
NSMutableDictionary *params=[[NSMutableDictionary alloc] init];
    [params setObject:@"taobao.taobaoke.items.get" forKey:@"method"];
    [params setObject:@"num_iid,title,pic_url,price,score" forKey:@"fields"];
    [params setObject:@"淘宝帐户" forKey:@"nick"];
    [params setObject:selectedItemCat.cid forKey:@"cid"];
    [params setObject:@"true" forKey:@"is_mobile"];
    NSData *resultData=[Utility getResultData:params];