如何在iOS5中将JSON数据对象发布到服务器？

我想使用

JSON

数据类型，使用

POST

方法将在iOS上创建的新对象发送到接收服务器。据我所知，在iOS中从服务器接收数据时，所有的

JSON

处理都被苹果通过iOS 5简化了。但与获取JSON对象不同的是，在我能找到的任何地方都没有真正描述发布这些对象

我尝试解决问题的第一步如下：

    //build an info object and convert to json
    NSDictionary *newDatasetInfo = [NSDictionary dictionaryWithObjectsAndKeys:name, @"name", language, @"language", nil];

    //convert object to data
    NSData* jsonData = [NSJSONSerialization dataWithJSONObject:newDatasetInfo options:kNilOptions error:&error];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:someURLSetBefore];
    [request setHTTPMethod:@"POST"];
    // any other things to set in request? or working this way?

    [[NSURLConnection alloc] initWithRequest:request delegate:self];
    // What to do with NSURLConnection? Or how to send differently?

但我真的不知道如何使用POST方法将JSON对象发送到服务器。

---

有人能帮我一下吗？

我试了一下，找到了答案，下面是我的代码：

    //build an info object and convert to json
    NSDictionary *newDatasetInfo = [NSDictionary dictionaryWithObjectsAndKeys:name, @"name", language, @"language", nil];

    //convert object to data
    NSData* jsonData = [NSJSONSerialization dataWithJSONObject:newDatasetInfo options:kNilOptions error:&error];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:someURLSetBefore];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setHTTPBody:jsonData];

    // print json:
    NSLog(@"JSON summary: %@", [[NSString alloc] initWithData:jsonData
                                                     encoding:NSUTF8StringEncoding]);
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [connection start];

NSString*strUrl=@“URL”； NSURL*url=[NSURL URLWithString:strUrl]

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60.0];

// For set postdata in string
NSString *strPatientID = [NSString stringWithFormat:@"%@%@%@%@",self.txtDegit1.text,self.txtDegit2.text,self.txtDegit3.text,self.txtDegit4.text];
NSString *deviceToken = @"";
postString = [NSString stringWithFormat:@"practiceid=%@&email=%@&password=%@&devicetoken=%@",strPatientID,self.txtUsername.text,self.txtPassword.text,deviceToken];


NSMutableData *httpDataBody = [NSMutableData data];
[httpDataBody appendData:[postString dataUsingEncoding:NSUTF8StringEncoding]];

NSString *strPostLength = [NSString stringWithFormat:@"%lu",[httpDataBody length]];

if ([httpDataBody length ] > 0){

    [request addValue:@"application/x-www-form-urlencoded charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPMethod:@"POST"];
    [request addValue:strPostLength forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:httpDataBody];

}

urlConnection = [[NSURLConnection alloc]initWithRequest:request delegate:self];
[urlConnection start];

-（iAction）txtFetchData2:（id）发送方{
NSString*queryString=[NSString stringWithFormat:@”http://example.com/username.php?name=%@“，[self.txtName text]]；
NSMutableURLRequest*theRequest=[NSMutableURLRequest
requestWithURL:[NSURL URLWithString:
查询字符串]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0]；
NSDictionary*jsonDictionary=[NSDictionary Dictionary WithObjectsAndKeys:
@“值1”@“键1”，
@“值2”@“键2”，
零]；
n错误*错误；
NSData*jsonData=[NSJSONSerialization dataWithJSONObject:jsonDictionary
选项：nsjsonwritingprettyptederror:&error]；
[TheRequestSetHttpMethod:@“POST”]；
[TheRequestAddValue:@“应用程序/json”用于HttpHeaderField:@“内容类型”]；
//应该在这里检查并处理错误，但我们没有
[请求集httpbody:jsonData]；
[NSURLConnection sendAsynchronousRequest:theRequest队列：[NSOperationQueue mainQueue]完成处理程序：^（NSURResponse*响应，NSData*数据，NSError*错误）{
如果（错误）{
//做错事
}否则{
NSString*responseText=[[NSString alloc]initWithData:数据编码：NSASCIIStringEncoding]；
NSLog（@“响应：%@”，响应文本）；
NSString*newLineStr=@“\n”；
responseText=[responseText StringByReplacingOfString:@“
”with string:newLineStr]；
[self.lbldatasettext:responseText]；
}
}];
}

您能否详细说明您的代码中发生了什么？我现在已经在自己的应用程序中使用了它，但我真的不知道它在做什么。我了解字典并将其转换为JSON的数据，但对我来说，URLRequest和URLConnection的所有内容都是未知的。任何澄清都很好！NSURLRequest基本上是一个用于设置web获取属性的对象。在正常的抓取中，您会自动设置最常用的默认值，但由于我想发送数据，我想使用HTTP POST方法，并因为我想接收JSON对象，所以我通过将内容类型和Accept HTTP header字段设置为JSON格式来告诉服务器这一点。要了解更多关于HTTP协议，特别是HTTP头的信息，只需搜索它们或阅读此处和此处。要了解更多关于NSURLConnection的信息，我认为最好的方法是阅读此处Apple文档中的类引用。一般来说，我只能鼓励您首先查看Apple文档，因为它是学习这些东西的一个很好的（而且绝对是最新的）来源。哦，当然我的意思是我想发送一个JSON对象，而不是接收。编辑时间已经结束了…：（@CGee For the error:&error您是否只是声明一个NSError并将其设置为nil？因为我尝试了，它只是崩溃了？？

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60.0];

// For set postdata in string
NSString *strPatientID = [NSString stringWithFormat:@"%@%@%@%@",self.txtDegit1.text,self.txtDegit2.text,self.txtDegit3.text,self.txtDegit4.text];
NSString *deviceToken = @"";
postString = [NSString stringWithFormat:@"practiceid=%@&email=%@&password=%@&devicetoken=%@",strPatientID,self.txtUsername.text,self.txtPassword.text,deviceToken];


NSMutableData *httpDataBody = [NSMutableData data];
[httpDataBody appendData:[postString dataUsingEncoding:NSUTF8StringEncoding]];

NSString *strPostLength = [NSString stringWithFormat:@"%lu",[httpDataBody length]];

if ([httpDataBody length ] > 0){

    [request addValue:@"application/x-www-form-urlencoded charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPMethod:@"POST"];
    [request addValue:strPostLength forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:httpDataBody];

}

urlConnection = [[NSURLConnection alloc]initWithRequest:request delegate:self];
[urlConnection start];

- (IBAction)txtFetchData2:(id)sender {
NSString *queryString = [NSString stringWithFormat:@"http://example.com/username.php?name=%@", [self.txtName text]];
NSMutableURLRequest *theRequest=[NSMutableURLRequest
                          requestWithURL:[NSURL URLWithString:
                                          queryString]
                          cachePolicy:NSURLRequestUseProtocolCachePolicy
                          timeoutInterval:60.0];
NSDictionary* jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                @"Value1", @"Key1",
                                @"Value2", @"Key2",
                                nil];
NSError *error;
NSData* jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary
                       options:NSJSONWritingPrettyPrinted error:&error];
[theRequest setHTTPMethod:@"POST"];
[theRequest addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
// should check for and handle errors here but we aren't
[theRequest setHTTPBody:jsonData];
[NSURLConnection sendAsynchronousRequest:theRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
    if (error) {
        //do something with error
    } else {
        NSString *responseText = [[NSString alloc] initWithData:data encoding: NSASCIIStringEncoding];
        NSLog(@"Response: %@", responseText);

        NSString *newLineStr = @"\n";
        responseText = [responseText stringByReplacingOccurrencesOfString:@"<br />" withString:newLineStr];            
        [self.lblData setText:responseText];
    }
}];
}