[ios]get,post请求 【转】

     //========get同步===========//      

NSURL * getSynurl=[NSURL URLWithString:@""];
        NSURLRequest * getSynrequest=[[NSURLRequest alloc] initWithURL:getSynurl cachePolicy:(NSURLRequestUseProtocolCachePolicy) timeoutInterval:10];
        
//            NSURLRequestUseProtocolCachePolicy（基础策略）
//            
//            NSURLRequestReloadIgnoringLocalCacheData（忽略本地缓存）
//            
//            NSURLRequestReturnCacheDataElseLoad（首先使用缓存，如果没有本地缓存，才从原地址下载）
//           
//            NSURLRequestReturnCacheDataDontLoad（使用本地缓存，从不下载，如果本地没有缓存，则请求失败，此策略多用于离线操作）
//            
//             NSURLRequestReloadIgnoringLocalAndRemoteCacheData（无视任何缓存策略，无论是本地的还是远程的，总是从原地址重新下载）
//            
//            NSURLRequestReloadRevalidatingCacheData（如果本地缓存是有效的则不下载，其他任何情况都从原地址重新下载）
        
        NSError *err;
        NSData *getSynrecived=[NSURLConnection sendSynchronousRequest:getSynrequest returningResponse:nil error:&err];
        NSString * getSynstr=[[NSString alloc] initWithData:getSynrecived encoding:(NSUTF8StringEncoding)];
        NSLog(@"get同步请求得到的数据是:%@",getSynstr);
      
        //=======post同步============//
       
        NSURL * postSynurl=[NSURL URLWithString:@""];
        NSMutableURLRequest * postSynrequest=[[NSMutableURLRequest alloc] initWithURL:postSynurl cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
        [postSynrequest setHTTPMethod:@"POST"];
        NSString *str=@"参数";
        NSData * data=[str dataUsingEncoding:NSUTF8StringEncoding];
        [postSynrequest setHTTPBody:data];

       //- (void)setAllHTTPHeaderFields:(NSDictionary *)headerFields 设置头报文信息

      //- (void)setValue:(NSString *)value forHTTPHeaderField:(NSString *)field;
        NSData * postsynreceived=[NSURLConnection sendSynchronousRequest:postSynrequest returningResponse:nil error:nil];
        NSString *postSynstr=[[NSString alloc] initWithData:postsynreceived encoding:NSUTF8StringEncoding];
        
        //=========get异步========//
       
        NSURL * geturl=[NSURL URLWithString:@""];
         NSURLRequest *getrequest = [[NSURLRequest alloc]initWithURL:geturl cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
        NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:getrequest delegate:self];
        
      
        //=========post异步=======//
       
        NSURL * posturl=[NSURL URLWithString:@""];
        NSMutableURLRequest *postrequest = [[NSMutableURLRequest alloc]initWithURL:posturl cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
        
        [postrequest setHTTPMethod:@"POST"];
        
        NSString *poststr = @"参数";
            
         NSData *postdata = [poststr dataUsingEncoding:NSUTF8StringEncoding];
            
           [postrequest setHTTPBody:postdata];
        
         NSURLConnection *postconnection = [[NSURLConnection alloc]initWithRequest:postrequest delegate:self];
        
        //[postconnection start];
        
 //以下是异步请求的代理方法    
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{

//服务器收到请求后回应

}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
//接收数据，此方法不仅被调用一次
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
 
{
}
-(void)connection:(NSURLConnection *)connection{


}