使用ASIHttpRequest调用WebService

在项目中用到了好多的调用WebSerViece的请求的地方，一直用系统的 NSMutableURLRequest 和NSURLConnection结合实现的，这样做有一定的好处，原生态，不会过时。

但是有时你获取需要实现一定的效果，用系统的虽然也能实现，但比较麻烦，除非自己封装，要不每次都的重写，ASI是比较好的网络请求开源框架，用的人比较多，遗憾的是已经停止更新，（据说在ios7 下有些问题，暂时还没有研究，等ios7正式发布以后在具体的试试），暂时还是能用的，这里就说说怎么用ASIHttpRequest 调用WebService

1、传统的调用方式(具体的你可以参考http://www.cocoachina.com/bbs/read.php?tid=16561&keyword=soap)

1. - (void)getOffesetUTCTimeSOAP
2. {
3.         recordResults = NO;
4.         //封装soap请求消息
5.         NSString *soapMessage = [NSString stringWithFormat:
6.                                                          @"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
7.                                                          "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"
8.                                                          "<soap:Body>\n"
9.                                                          "<getOffesetUTCTime xmlns=\"http://www.Nanonull.com/TimeService/\">\n"
10.                                                          "<hoursOffset>%@</hoursOffset>\n"
11.                                                          "</getOffesetUTCTime>\n"
12.                                                          "</soap:Body>\n"
13.                                                          "</soap:Envelope>\n",nameInput.text
14.                                                          ];
15.         NSLog(soapMessage);
16.         //请求发送到的路径
17.         NSURL *url = [NSURL URLWithString:@"http://www.nanonull.com/TimeService/TimeService.asmx"];
18.         NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
19.         NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];
20.         
21.         //以下对请求信息添加属性前四句是必有的，第五句是soap信息。
22.         [theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
23.         [theRequest addValue: @"http://www.Nanonull.com/TimeService/getOffesetUTCTime" forHTTPHeaderField:@"SOAPAction"];
24.         
25.         [theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
26.         [theRequest setHTTPMethod:@"POST"];
27.         [theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
28.         
29.         //请求
30.         NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
31.         
32.         //如果连接已经建好，则初始化data
33.         if( theConnection )
34.         {
35.                 webData = [[NSMutableData data] retain];
36.         }
37.         else
38.         {
39.                 NSLog(@"theConnection is NULL");
40.         }
41.         
42.         
43. }

2 通过ASI调用webService 其实和传统的方式基本一样，只是做了相关的封装而已，具体的请参考下面的文章

http://www.cocoachina.com/bbs/read.php?tid=98388&keyword=http