Objective-C的Http请求（转）

//prepar request

NSString *urlString = [NSString stringWithFormat:@"http://urlToSend.com"];
  NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
  [request setURL:[NSURL URLWithString:urlString]];
  [request setHTTPMethod:@"POST"];

        //set headers
  NSString *contentType = [NSString stringWithFormat:@"text/xml"];
  [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

  //create the body
  NSMutableData *postBody = [NSMutableData data];
  [postBody appendData:[[NSString stringWithFormat:@"<xml>"] dataUsingEncoding:NSUTF8StringEncoding]];
  [postBody appendData:[[NSString stringWithFormat:@"<yourcode/>"] dataUsingEncoding:NSUTF8StringEncoding]];
  [postBody appendData:[[NSString stringWithFormat:@"</xml>"] dataUsingEncoding:NSUTF8StringEncoding]];

        //post
  [request setHTTPBody:postBody];

  //get response
  NSHTTPURLResponse* urlResponse = nil;  
  NSError *error = [[NSError alloc] init];  
  NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];  
  NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
  NSLog(@"Response Code: %d", [urlResponse statusCode]);
  if ([urlResponse statusCode] >= 200 && [urlResponse statusCode] < 300) {
    NSLog(@"Response: %@", result);

                //here you get the response

  }
//该代码片段来自于: http://www.sharejs.com/codes/objectc/2526

​​http://www.sharejs.com/codes/objectc/2526​​

另外的一个文章中是这样写的：

post请求:

//post数据到地址url
-(NSString*)httpPostDataWithUrl:(NSString*)url postData:(NSString*)data
{
    //使用工厂方法创建
//    NSURLRequest *request = [NSURLRequest requestWithURL:url];
//    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    //同时设置缓存策略和超时时间
    NSMutableURLRequest *[NSURLRequest requestWithURL:[NSURL URLWithString:[_mainUrl stringByAppendingString:url]]  cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:15];
    //设置Http头
    NSDictionary *headers = [request allHTTPHeaderFields];
    [headers setValue:@"iOS-Client-ABC" forKey:@"User-Agent"];
    //设置请求方法
    //[request setHTTPMethod:@"GET"];
setHTTPMethod:@"POST"];
    //设置要发送的正文内容（适用于Post请求）
    //NSString *content = @"username=stanyung&password=123";
    NSData *contentData = [data dataUsingEncoding:NSUTF8StringEncoding];
setHTTPBody:contentData];
    //同步执行Http请求，获取返回数据
NSURLResponse
NSError *error = nil;
    NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    //返数据转成字符串
    NSString *html = [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
    NSLog(@"get html:%@",html);
    //（如果有错误）错误描述
if
NSString *errorDesc = [error localizedDescription];
NSLog(@"%@",errorDesc);
    }
    
    //获取状态码和HTTP响应头信息
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse
NSInteger statusCode = [httpResponse statusCode];
NSLog(@"statusCode:%i",statusCode);
NSDictionary *responseHeaders = [httpResponse allHeaderFields];
NSString *cookie = [responseHeaders valueForKey:@"Set-Cookie"];
NSLog(@"cookie:%@",cookie);
return
}

get请求

-(NSString*)httpGetDataWithUrl:(NSString*)url
{
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[_mainUrl stringByAppendingString:url]]];
    NSDictionary *headers = [request allHTTPHeaderFields];
    [headers setValue:@"iOS-Client-ABC" forKey:@"User-Agent"];
    
    //同步执行Http请求，获取返回数据
NSURLResponse
NSError *error = nil;
    NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    //返数据转成字符串
    NSString *html = [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
    NSLog(@"get html:%@",html);
    //（如果有错误）错误描述
if
NSString *errorDesc = [error localizedDescription];
NSLog(@"%@",errorDesc);
    }
    
    //获取状态码和HTTP响应头信息
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse
NSInteger statusCode = [httpResponse statusCode];
NSLog(@"statusCode:%i",statusCode);
NSDictionary *responseHeaders = [httpResponse allHeaderFields];
NSString *cookie = [responseHeaders valueForKey:@"Set-Cookie"];
NSLog(@"cookie:%@",cookie);
return
}