Question

我使用JSON字符串作为对服务器的请求，并以JSON格式获取响应。我已使用此代码发布数据

NSString *requestString = [NSString stringWithFormat:@"{\"id\":\"1\"}}"];
NSLog(@"the request string is %@", requestString);
NSData *requestData = [NSData dataWithBytes: [requestString UTF8String] length: [requestString length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: @"http//www.aaaa.com"]];
[request setHTTPMethod: @"POST"];
[request setHTTPBody: requestData];
[request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
[theConnection start];

if( theConnection ){            
    receiveData = [[NSMutableData data] retain];
}

在服务器端，他们使用核心PHP和post方法，每当我将请求发送到服务器时，我都没有得到数据，而JSON请求文件没有到达服务器。所以请帮帮我。

但是上面的代码在另一个项目中运行得很好，他们在服务器端使用了SOAP。所以请建议我，在服务器端或iPhone端，我可以在哪里更改代码来实现这一点。

谢谢！

Answer 1

除了Snips评论，

请同时添加以下标题。

[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];

另外，在这一行中，

NSString *requestString = [NSString stringWithFormat:@"{\"id\":\"1\"}}"];

它有两个紧密的括号。请检查一下。

<强>更新

您是否实施了NSURLConnectionDelegate方法？

请参阅link。

Answer 2

嗨，请在您的代码中添加以下行.....可能会帮助您

[request setValue：@“application / json”forHTTPHeaderField：@“Accept”];

Answer 3

使用此代码

使用需要的值创建post参数。

在.h文件中实现NSURLConnectionDelegate委托。

      url=[NSURL URLWithString:@"#####called url ####### change this according your need ####"];
        post = [NSString stringWithFormat:@"name=%@&tags=%@&location=%@&location_lat=%f&location_lng=%f&pluses=%@&minuses=%@&image=%@&creator=%@",self.txtName.text,tags,self.txtLocation.text,center.latitude,center.longitude,plusValu,minusValu,imgUrlStr,deviceId];

     NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];


    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60];

    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];

    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];
    NSURLConnection *connection=[NSURLConnection connectionWithRequest:request delegate:self];

    if(connection){
        resData = [NSMutableData data];

    }

实现委托方法并从服务器获取数据

  (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
  {
   NSLog(@"didReceiveResponse %s##### response  %@",__FUNCTION__,response);
 //[resData setLength:0];
  }

 (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
   {
   NSLog(@"didReceiveData %@",[[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding] JSONValue]);

  }

   (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
      {
     //NSLog(@"didFailWithError %s and Error %@",__FUNCTION__,[error userInfo]);
   //[responseData release];
    // [_delegate parserDidFailedWithError:[NSString stringWithFormat:@"Connection failed:  %@",   [error description]] forAction:_action];
    }

 (void)connectionDidFinishLoading:(NSURLConnection *)connection
{

   //   NSLog(@"connectionDidFinishLoading %s",__FUNCTION__);

}

Answer 4

您需要以下内容：

NSDictionary *dataDict = @{@"id": @"1"};
NSData *requestData = [NSJSONSerialization dataWithJSONObject:dataDict options:0 error:nil];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: @"http//www.aaaa.com"]];

[request setHTTPMethod: @"POST"];
[request setHTTPBody: requestData];
[request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/json; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];

if ( theConnection ) {            
    receiveData = [[NSMutableData data] retain];
}

如何在iPhone的Post方法中发送JSON请求？

4 个答案: