iphone之XML字符串中带有特殊字符的发布请求

我在下面的代码中编写了肥皂Web服务中的请求:

NSString *newstr = [[NSString alloc] initWithFormat:@"%@/Enki_UpperWs.asmx",[WebServices RequestURL]]; 
NSString *soapMsg = [[NSString alloc] initWithFormat:@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" 
                         "<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" 
                         "<soap:Body>\n" 
                         "<Generate_Facility_List xmlns=\"http://tempuri.org/\">\n" 
                         "<UserID>%d</UserID>\n" 
                         "<LicenseKey>%d</LicenseKey>\n" 
                         "<token>%@</token>\n" 
                         "</Generate_Facility_List>\n" 
                         "</soap:Body>\n" 
                         "</soap:Envelope>",UserId,OfficeKey,strUserToken]; 
 
    soapMsg=[self getcodeforkeys:soapMsg]; 
 
    NSString *msgLength = [NSString stringWithFormat:@"%i", [soapMsg length]]; 
    NSURL *myURL = [[NSURL alloc] initWithString:[newstr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; 
    NSMutableURLRequest *myRequest = [NSMutableURLRequest requestWithURL:myURL cachePolicy:NSURLCacheStorageAllowed timeoutInterval:500]; 
    [myRequest setValue:@"text/xml; charset=UTF-8" forHTTPHeaderField:@"Content-type"]; 
    [myRequest addValue:@"http://tempuri.org/Generate_Facility_List" forHTTPHeaderField:@"SOAPAction"]; 
    [myRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"]; 
    [myRequest setHTTPMethod:@"POST"]; 
    [myRequest setHTTPBody:[soapMsg dataUsingEncoding:NSUTF8StringEncoding]]; 
    NSURLConnection *con = [[NSURLConnection alloc]initWithRequest:myRequest delegate:self]; 
    self.connection = con; 
    [con release]; 
    [myURL release]; 
    [newstr release]; 
    [soapMsg release]; 
    return [self doParsing]; 

但是，如果任何具有特殊字符的参数(例如 <或> 或＆或'或“)并且如果我使用以下功能将其替换:

-(NSString*)getcodeforkeys:(NSString*)str_code{ 
    str_code = [str_code stringByReplacingOccurrencesOfString:@"&" withString:@"&"]; 
    str_code = [str_code stringByReplacingOccurrencesOfString:@"<" withString:@"&lt;"]; 
    str_code = [str_code stringByReplacingOccurrencesOfString:@">" withString:@"&gt;"]; 
    str_code = [str_code stringByReplacingOccurrencesOfString:@"'" withString:@"&apos;"]; 
    str_code = [str_code stringByReplacingOccurrencesOfString:@"\"" withString:@"&quot;"]; 
    return str_code; 
}  

它也替换了XML字符。由于该原因，我无法以XML格式发布请求。我只需要替换传递的对象，并保持XML格式不变，但如何做？

例如，如果我将strUserToken传递为@“testing <＆>”，则它将替换其特殊字符，而不替换XML字符串。

有人可以帮忙吗？

请您参考如下方法:

XML Validation:

根据DTD验证的XML是“有效” XML。

您可能想尝试以下一种方法，以确保最终的XML有效:

使用CDATA部分作为文本内容。

分别转义文本内容(在您的情况下为UserId，OfficeKey和strUserToken)。

1。

NSString *soapMsg = [[NSString alloc] initWithFormat:@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" 
                         "<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" 
                         "<soap:Body>\n" 
                         "<Generate_Facility_List xmlns=\"http://tempuri.org/\">\n" 
                         "<UserID><![CDATA[%d]]></UserID>\n" 
                         "<LicenseKey><![CDATA[%d]]></LicenseKey>\n" 
                         "<token><![CDATA[%@]]></token>\n" 
                         "</Generate_Facility_List>\n" 
                         "</soap:Body>\n" 
                         "</soap:Envelope>",UserId,OfficeKey,strUserToken]; // the text inside CDATA is not parsed as a part of XML, it might have special characters unescaped. The parser should support CDATA though 
 
// do not escape complete document - remove the line soapMsg=[self getcodeforkeys:soapMsg]; 

2。

NSString *soapMsg = [[NSString alloc] initWithFormat:@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" 
                         "<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" 
                         "<soap:Body>\n" 
                         "<Generate_Facility_List xmlns=\"http://tempuri.org/\">\n" 
                         "<UserID>%d</UserID>\n" 
                         "<LicenseKey>%d</LicenseKey>\n" 
                         "<token>%@</token>\n" 
                         "</Generate_Facility_List>\n" 
                         "</soap:Body>\n" 
                         "</soap:Envelope>", 
                         [self getcodeforkeys:UserId], 
                         [self getcodeforkeys:OfficeKey], 
                         [self getcodeforkeys:strUserToken]]; // escape text separately 
 
// do not escape complete document - remove the line soapMsg=[self getcodeforkeys:soapMsg];