IOS4.2网络学习之发送HTTP请求的原理

开发环境 客户端: mac os x 10.6.6 ,ios 4.2 + xcode3.2.5  服务端:windows xp + tomcat6

XCODE代码如下:

   - (IBAction) sendHttp : (id) sender{
           //此处进行GET方式 发送http请求
               //如有中文要进行NSUTF8StringEncoding编码
                  NSString *urlString =[[NSString stringWithFormat:@"http://192.168.0.110/Login?user=test"
                            stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];  
                  //初始化http请求,并自动内存释放  
                  NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];  
                  [request setURL:[NSURL URLWithString:urlString]]; 
                  [request setHTTPMethod:@"GET"];  
                  NSString *contentType = [NSString stringWithFormat:@"text/xml"]; 
                  [request addValue:contentType forHTTPHeaderField:@"Content-Type"];  
                  NSHTTPURLResponse *urlResponse = nil; 
                  NSError *error = [[NSError alloc] init];  
                  //同步返回请求，并获得返回数据  
                  NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
                  NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; 
                  //请求返回状态，如有中文无法发送请求，并且stausCode 值为 0 
                  NSLog(@"response code:%d",[urlResponse statusCode]); 
                  if([urlResponse statusCode] >= 200 && [urlResponse statusCode] <300){ 
                        NSLog(@"response:%@",result);  

                  } 
       }
      
服务端:

     1.设置TOMCAT启动参数 -Dfile.encoding=UTF-8
     2.编写简单的LoginServlet，并在web.xml作好配置

注：如果不设置TOMCAT启动时的编码参数，接收到的result为NULL.