ios - How to parse HTML content in ios?

问题

How do I parse HTML file?

I'm getting an HTML file in the below code,I just want to get data in between BinarySecurityToken XML node.

 - (void)connectionDidFinishLoading:(NSURLConnection *)connection
 {
   if(_data)
  {
    //Here am getting the below HTML content
    NSString* content = [[NSString alloc] initWithData:_data
                                              encoding:NSUTF8StringEncoding];
  }
 }


<input type="hidden" name="wa" value="wsignin1.0" />
<input type="hidden" name="wresult"
    value="<t:RequestSecurityTokenResponse xmlns:t="http://schemas.xmlsoap.org/ws/2005/02/trust">
<t:Lifetime>
   <wsu:Created >2013-04-29T11:50:29.895Z</wsu:Created>
   <wsu:Expires>2013-04-29T12:00:29.895Z</wsu:Expires>
</t:Lifetime>
<wsp:AppliesTo>     
<EndpointReference>
<Address>urn:orin.converse</Address>
</EndpointReference></wsp:AppliesTo>
<t:RequestedSecurityToken>    
   <wsse:BinarySecurityToken>
         aHR0cCUzYSUyZiUyZnNjaGVtYWd0Sjk0JTNk
   </wsse:BinarySecurityToken>

Any ideas? Thanks in advance.

回答1:

You can get using this code

NSRange divRange = [content rangeOfString:@"<wsse:BinarySecurityToken>" options:NSCaseInsensitiveSearch];
    if (divRange.location != NSNotFound)
    {
        NSRange endDivRange;

        endDivRange.location = divRange.length + divRange.location;
        endDivRange.length   = [content length] - endDivRange.location;
        endDivRange = [content rangeOfString:@"</wsse:BinarySecurityToken>" options:NSCaseInsensitiveSearch range:endDivRange];

        if (endDivRange.location != NSNotFound)
        {
            divRange.location += divRange.length;
            divRange.length  = endDivRange.location - divRange.location;


            NSLog(@"BinarySecurityToken : %@",[content substringWithRange:divRange]);
        }
    }

Output : aHR0cCUzYSUyZiUyZnNjaGVtYWd0Sjk0JTNk

回答2:

You need and XML parser for that.

There's a tutorial here

回答3:

For this particular case you can get the ranges of <wsse:BinarySecurityToken> and </wsse:BinarySecurityToken>, construct new range that will provide you location of the token, and get substring in that range.

Sample code:

NSRange openingTagRange = [htmlString rangeOfString:@"<wsse:BinarySecurityToken>"];
NSRange closingTagRange = [htmlString rangeOfString:@"</wsse:BinarySecurityToken>"];
NSRange tokenRange = NSMakeRange(openingTagRange.location + openingTagRange.length, closingTagRange.location - (openingTagRange.location + openingTagRange.length));
NSString *token = [htmlString substringWithRange:tokenRange];

Since your input comes from outside, you should probably check if the ranges' locations are not equal to NSNotFound.

回答4:

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];
    NSData  * data      = [NSData dataWithContentsOfFile:filePath];
    TFHpple * tutorialsParser       = [[TFHpple alloc] initWithHTMLData:data];

    NSString *query = @"//div[@id='BinarySecurityToken']";
    NSArray *nodes = [tutorialsParser searchWithXPathQuery:query];

    for (TFHppleElement * element in nodes) {
        NSLog(@"%@", element);
        NSLog(@"%@", [element tagName]);
        NSLog(@"%@", [element attributes]);
        NSLog(@"%@", [element children]);
        for (TFHppleElement *childElement in [element children]) {
                NSLog(@"%@", childElement);
        }
    }

hope this will help you For more try this blog and Git Project Resource may help you and Good blog by RAYWENDERLICH

or another option if you have all the HTML data in NSString you can get data between specific NSString with this function.

-(NSString*)stringBetweenString:(NSString*)start andString:(NSString)end {
    NSRange startRange = [self rangeOfString:start];
    if (startRange.location != NSNotFound) {
        NSRange targetRange;
        targetRange.location = startRange.location + startRange.length;
        targetRange.length = [self length] - targetRange.location;   
        NSRange endRange = [self rangeOfString:end options:0 range:targetRange];
        if (endRange.location != NSNotFound) {
           targetRange.length = endRange.location - targetRange.location;
           return [self substringWithRange:targetRange];
        }
    }
    return nil;
}

来源：https://stackoverflow.com/questions/16566129/ios-how-to-parse-html-content-in-ios