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. ????????[theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
25. ????????[theRequest setHTTPMethod:@"POST"];
26. ????????[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
27. ????????//请求
28. ????????NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
29. ????????//如果连接已经建好，则初始化data
30. ????????if( theConnection )
31. ????????{
32. ????????????????webData = [[NSMutableData data] retain];
33. ????????}
34. ????????else
35. ????????????????NSLog(@"theConnection is NULL");
36. }