我试图通过下面的代码将
JSON数据发送到Web服务器.由于某种原因,请求似乎没有出去.我错过了什么？ NSURLConnection(retStr)的结果也总是空的？
NSDictionary *data = [NSDictionary dictionaryWithObject:@"test sending ios" forKey:@"value1"];
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:data options:kNilOptions error:&error];
NSURL *url = [NSURL URLWithString:@"http://webserveraddress"];
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url cachePolicy:nil timeoutInterval:60];
[req setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[req setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[req setValue:[NSString stringWithFormat:@"%d",[jsonData length]] forHTTPHeaderField:@"Content-Length"];
[req setHTTPMethod:@"POST"];
[req setHTTPBody:jsonData];
NSString *retStr = [[NSString alloc] initWithData:[NSURLConnection sendSynchronousRequest:req returningResponse:nil error:nil] encoding:NSUTF8StringEncoding];
解决方法
要将post vars中的简单数据发送到运行PHP的web服务器,您只需执行此操作即可
例
NSString * key = [NSString stringWithFormat:@"var1=%@&var2=%@&var3=%@",@"var1String",@"var2string",[NSnumber numberWithBool:YES]]; NSURL * url = [NSURL URLWithString:@"http://webserver.com/yourScriptPHP.PHP"]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url]; [request setHTTPMethod:@"POST"]; [request setHTTPBody:[key dataUsingEncoding:NSUTF8StringEncoding]]; [[NSURLConnection alloc] initWithRequest:request delegate:self]; // this is for you to be able to get your server answer. // you will need to make your class a delegate of NSURLConnectionDelegate and NSURLConnectionDataDelegate myClassPointerData = [[NSMutableData data] retain];
实行
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[myClassPointerData appendData:data]
}
-(void)connection:(NSURLConnection *)connection DidFinishLoading {
// do what you want with myClassPointerData the data that your server did send you back here
// for info on your server PHP script you just need to do: echo json_encode(array('var1'=> $var1,'var2'=>$var2...));
// to get your server sending an answer
}