iphone - XML字符串中带有特殊字符的发布请求

Question

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？

Answer 1

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];