iOS学习之2-使用ASIHttpRequest调用WebService

工作中，使用iPhone作为已有产品的移动终端，目前做能想到最理想的方式就是恳求产品提供WebService了，还是老习惯，坚决不要零散的代码，继续整理为通用的类，便于拉壮丁快速开发，虽然目前的壮丁就俺一个，hoho

再次利用现有的资源，使用了ASIHttpRequest v1.8.1，因为项目中使用了Windows集成验证，而这个东西正好提供了响应的验证方式，爽歪歪了。

还是那句话：只是单纯的希望，大家都能有共享学习的精神！

再一个，项目都是.Net相关的，在浏览器中访问.Net WebService的asmx文件时，会返回一系列帮助文件，让我们了解这个WebService有几个调用方法，每个方法的入口参数是什么，返回值是什么，这次使用了SOAP1.1的规范。

再再一个，这个类并不完善，WebService某个方法的参数，必须是简单的数据类型，如数值、字符等等，不支持数据集等对象，等以后需要了再完善吧，呵呵。

再再再一个，调用后的响应解析，是另一个课题，不在这里讲啦，预报下，如果响应中包含了.Net的数据集，也是自己写了通用类可以解析滴，嘎嘎。

再再再再一个，保证是最后一个再了，代码里面看到这个 [Constant sharedConstant].P_SYSTEM_URL ，就去看看前一篇文章吧，单例模式实现常量存储，哈哈。

1、先看看调用说明：

自定义WebService访问类，需要使用下面这个字符串作为SOAP请求，通过POST的方式，提交给WebService

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POST /iwscooperationws/todocenter.asmx HTTP/1.1 Host: 192.168.1.11 Content-Type: text/xml; charset=utf-8 Content-Length: length SOAPAction: "http://iws.CP.ws/GetWorkflowToDoCount"   <?xmlversion="1.0"encoding="utf-8"?> <soap:Envelopexmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:xsd="http://www.w3.org/2001/XMLSchema"xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">   <soap:Body>     <GetWorkflowToDoCountxmlns="http://iws.CP.ws/">       < 4000 ;UserName>string</UserName>     </GetWorkflowToDoCount>   </soap:Body> </soap:Envelope>

在上述的XML中，可以看到这个asmx提供了一个GetWorkflowToDoCount的方法，其参数是UserName，其中的http://iws.CP.ws/是WebService中自己定义的命名空间。经过对几个WebService的实验发现，除了这几个字符串之外，都是不变的东西，那么这个长长的串串，就复制粘贴留下来，等下一步利用之。

2、.h文件中的声明，注释都放到了.m文件中，这是个人习惯：

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+ (ASIHTTPRequest *)getASISOAP11Request:(NSString*) WebURL                          webServiceFile:(NSString*) wsFile                            xmlNameSpace:(NSString*) xmlNS                          webServiceName:(NSString*) wsName                            wsParameters:(NSMutableArray*) wsParas;   + (NSString*)getSOAP11WebServiceResponse:(NSString*) WebURL                            webServiceFile:(NSString*) wsFile                              xmlNameSpace:(NSString*) xmlNS                            webServiceName:(NSString*) wsName                              wsParameters:(NSMutableArray*) wsParas;   + (NSString*)getSOAP11WebServiceResponseWithNTLM:(NSString*) WebURL                                    webServiceFile:(NSString*) wsFile                                      xmlNameSpace:(NSString*) xmlNS                                    webServiceName:(NSString*) wsName                                      wsParameters:(NSMutableArray*) wsParas                                         userName:(NSString*) userName                                          passWord:(NSString*) passWord;   + (NSString*)checkResponseError:(NSString*) theResponse;

3、.m文件的实现之一，生成ASIHttpRequest请求：

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/* //Mark: 生成SOAP1.1版本的ASIHttp请求  参数 webURL：                远程WebService的地址，不含*.asmx  参数 webServiceFile：        远程WebService的访问文件名，如service.asmx  参数 xmlNS：                    远程WebService的命名空间  参数 webServiceName：        远程WebService的名称  参数 wsParameters：            调用参数数组，形式为[参数1名称，参数1值，参数2名称，参数2值⋯⋯]，如果没有调用参数，此参数为nil  */ + (ASIHTTPRequest *)getASISOAP11Request:(NSString*) WebURL                          webServiceFile:(NSString*) wsFile                            xmlNameSpace:(NSString*) xmlNS                          webServiceName:(NSString*) wsName                            wsParameters:(NSMutableArray*) wsParas {     //1、初始化SOAP消息体     NSString* soapMsgBody1 = [[NSStringalloc] initWithFormat:                                @"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"                                "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" \n"                                "xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" \n"                                "xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"                                "<soap:Body>\n"                                "<%@ xmlns=\"%@\">\n", wsName, xmlNS];     NSString* soapMsgBody2 = [[NSStringalloc] initWithFormat:                                @"</%@>\n"                                "</soap:Body>\n"                                "</soap:Envelope>", wsName];           //2、生成SOAP调用参数     NSString* soapParas = [[NSStringalloc] init];     soapParas = @"";     if(![wsParas isEqual:nil]) {         inti = 0;         for(i = 0; i < [wsParas count]; i = i + 2) {             soapParas = [soapParas stringByAppendingFormat:@"<%@>%@</%@>\n",                          [wsParas objectAtIndex:i],                          [wsParas objectAtIndex:i+1],                          [wsParas objectAtIndex:i]];         }     }           //3、生成SOAP消息     NSString* soapMsg = [soapMsgBody1 stringByAppendingFormat:@"%@%@", soapParas, soapMsgBody2];           //请求发送到的路径     NSURL* url = [NSURLURLWithString:[NSStringstringWithFormat:@"%@%@", WebURL, wsFile]];           //NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];     ASIHTTPRequest * theRequest = [ASIHTTPRequest requestWithURL:url];     NSString*msgLength = [NSStringstringWithFormat:@"%d", [soapMsg length]];           //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。     [theRequest addRequestHeader:@"Content-Type"value:@"text/xml; charset=utf-8"];     [theRequest addRequestHeader:@"SOAP 123c6 Action"value:[NSStringstringWithFormat:@"%@%@", xmlNS, wsName]];           [theRequest addRequestHeader:@"Content-Length"value:msgLength];     [theRequest setRequestMethod:@"POST"];     [theRequest appendPostData:[soapMsg dataUsingEncoding:NSUTF8StringEncoding]];           [theRequest setDefaultResponseEncoding:NSUTF8StringEncoding];           returntheRequest; }

4、.m文件的实现之二，同步调用WebService请求，返回响应字符串

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#pragma mark - /*  //Mark: 使用SOAP1.1同步调用WebService请求  参数 webURL：                远程WebService的地址，不含*.asmx  参数 webServiceFile：        远程WebService的访问文件名，如service.asmx  参数 xmlNS：                    远程WebService的命名空间  参数 webServiceName：        远程WebService的名称  参数 wsParameters：            调用参数数组，形式为[参数1名称，参数1值，参数2名称，参数2值⋯⋯]，如果没有调用参数，此参数为nil  */ + (NSString*)getSOAP11WebServiceResponse:(NSString*) WebURL                            webServiceFile:(NSString*) wsFile                              xmlNameSpace:(NSString*) xmlNS                            webServiceName:(NSString*) wsName                              wsParameters:(NSMutableArray*) wsParas {     //创建请求     ASIHTTPRequest * theRequest = [selfgetASISOAP11Request:WebURL                                              webServiceFile:wsFile                                                xmlNameSpace:xmlNS                                              webServiceName:wsName                                                wsParameters:wsParas];           //显示网络请求信息在status bar上     [ASIHTTPRequest setShouldUpdateNetworkActivityIndicator:YES];           //同步调用     [theRequest startSynchronous];     NSError*error = [theRequest error];     if(!error) {         return[theRequest responseString];     }     else{         //出现调用错误，则使用错误前缀+错误描述         return[NSStringstringWithFormat:@"%@%@", [Constant sharedConstant].G_WEBSERVICE_ERROR, [error localizedDescription]];     } }

5、.m文件实现之三，同步调用需要Windows集成验证的WebService请求，返回响应字符串：

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#pragma mark - /*  //Mark: 使用SOAP1.1同步调用WebService请求，需提供Windows集成验证的用户名、密码和域  参数 webURL：                远程WebService的地址，不含*.asmx  参数 webServiceFile：        远程WebService的访问文件名，如service.asmx  参数 xmlNS：                    远程WebService的命名空间  参数 webServiceName：        远程WebService的名称  参数 wsParameters：            调用参数数组，形式为[参数1名称，参数1值，参数2名称，参数2值⋯⋯]，如果没有调用参数，此参数为nil  参数 userName                用户名--目前来看，不需要输入域信息  参数 passWord                密码  */ + (NSString*)getSOAP11WebServiceResponseWithNTLM:(NSString*) WebURL                                    webServiceFile:(NSString*) wsFile                                      xmlNameSpace:(NSString*) xmlNS                                    webServiceName:(NSString*) wsName                                      wsParameters:(NSMutableArray*) wsParas                                          userName:(NSString*) userName                                          passWord:(NSString*) passWord {     //创建请求     ASIHTTPRequest * theRequest = [selfgetASISOAP11Request:WebURL                                              webServiceFile:wsFile                                                xmlNameSpace:xmlNS                                              webServiceName:wsName                                                wsParameters:wsParas];           //集成验证NTLM用户名，密码和域设置     [theRequest setUsername:userName];     [theRequest setPassword:passWord];     //[theRequest setDomain:doMain];           //显示网络请求信息在status bar上     [ASIHTTPRequest setShouldUpdateNetworkActivityIndicator:YES];           //同步调用     [theRequest startSynchronous];     NSError*error = [theRequest error];     if(!error) {         return[theRequest responseString];     }     else{         //出现调用错误，则使用错误前缀+错误描述         return[NSStringstringWithFormat:@"%@%@", [Constant sharedConstant].G_WEBSERVICE_ERROR, [error localizedDescription]];     } }

6、.m文件实现之四，响应字符串中是否包含错误信息，简单处理了下错误消息的中文显示：

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#pragma mark - /*  //Mark: 检查WebService的Response是否包含错误信息     如果未包含错误，则返回零长度字符串     否则返回错误描述     错误信息格式：错误前缀\n错误描述  */ + (NSString*)checkResponseError:(NSString*) theResponse {     //检查消息是否包含错误前缀     if(![theResponse hasPrefix:[Constant sharedConstant].G_WEBSERVICE_ERROR]) {         return@"";     }     else{         NSMutableString*sTemp = [[NSMutableStringalloc] initWithString:theResponse];         //获取错误前缀的范围         NSRangerange=[sTemp rangeOfString:[Constant sharedConstant].G_WEBSERVICE_ERROR];         //剔除错误前缀         [sTemp replaceCharactersInRange:range withString:@""];                   NSString* errMsg = sTemp;         //Authentication needed         if([sTemp isEqualToString:@"Authentication needed"]) {             errMsg = @"用户登录失败！";         }         //The request timed out         if([sTemp isEqualToString:@"The request timed out"]) {             errMsg = @"访问超时，请检查远程地址等基本设置！";         }         //The request was cancelled         if([sTemp isEqualToString:@"The request was cancelled"]) {             errMsg = @"请求被撤销！";         }         //Unable to create request (bad url?)         if([sTemp isEqualToString:@"Unable to create request (bad url?)"]) {             errMsg = @"无法创建请求，错误的URL地址！";         }         //The request failed because it redirected too many times         if([sTemp isEqualToString:@"The request failed because it redirected too many times"]) {             errMsg = @"请求失败，可能是因为被重定向次数过多！";         }         //A connection failure occurred         if([sTemp isEqualToString:@"A connection failure occurred"]) {             errMsg = @"网络连接错误，请检查无线或3G网络设置！";         }                   returnerrMsg;     } }

7、开始调用啦：

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//创建WebService的调用参数     NSMutableArray* wsParas = [[NSMutableArrayalloc] initWithObjects:                                 @"UserName", [Constant sharedConstant].P_USER_NAME,                                 nil];           //调用WebService，获取响应     NSString* theResponse = [WebService getSOAP11WebServiceResponseWithNTLM:[Constant sharedConstant].P_SYSTEM_URL                                                                       webServiceFile:[Constant sharedConstant].G_WS_TODOCENTER                                                                 xmlNameSpace:[Constant sharedConstant].G_WEBSERVICE_NAMESPACE                                                               webServiceName:[Constant sharedConstant].G_WS_TODOCENTER_GETWORKFLOWTODOCOUNT                                                                 wsParameters:wsParas                                                                     userName:[Constant sharedConstant].P_USER_NAME                                                                     passWord:[Constant sharedConstant].P_PASSWORD];           //检查响应中是否包含错误     NSString* errMsg = [WebService checkResponseError:theResponse];           //接下来的代码就是检查errMsg有没有内容     //再接下来就是theResponse响应字符串的解析了 注意这个调用例子里面的WebService的参数UserName和调用windows集成验证时提供的userName，是两回事啊⋯⋯