iOS开发之html解析

使用XPath解析html

可以从此处https://github.com/topfunky/hpple下载工程，将TFHpple.h,TFHpple.m,TFHppleElement.h,TFHppleElement.m,XPathQuery.h,XPathQuery.m加到自己的项目中，在Frameworks中导入libxml2.x

 

在项目中找到Other Linker Flags，加入-libxml2

在项目中找到Header Search Paths，加入/usr/include/libxml2

代码如下：

 NSString *urlString = nil;

 urlString = @"http://www.xiyou.edu.cn/new/lm.jsp?urltype=tree.TreeTempUrl&wbtreeid=724";

 NSData *htmlData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:urlString]];

 NSData *toHtmlData = [self toUTF8:htmlData];

 TFHpple *xpathParser = [[TFHpple alloc] initWithHTMLData:toHtmlData];

 NSArray *aArray = [xpathParser searchWithXPathQuery:@"//a"];

 if ([span count] > ) {

             for (int i = ; i < ; i++) {
                             //从<a>的第82个开始取值，共获取15个值
                 TFHppleElement *aElement = [aArray objectAtIndex:i];
                 NSArray *aArr = [aElement children];
                 TFHppleElement *aEle = [aArr objectAtIndex:];
                 NSArray *aChild = [aEle children];
                 TFHppleElement *aChildEle = [aChild objectAtIndex:];
                 NSArray *aChildren = [aChildEle children];
                 NSString *aStr = [[aChildren objectAtIndex:] content];
                 NSLog(@"aStr:%@",aStr);
                 NSDictionary *aAttributeDict = [aElement attributes];
                 NSLog(@"aAttributeDict:%@",aAttributeDict);

                             //获取a中的属性值
                 NSString *hrefStr = [NSString stringWithFormat:@"http://www.xiyou.edu.cn%@",[aAttributeDict objectForKey:@"href"]];
                 NSLog(@"hrefStr:%@",hrefStr);

                 [currentNewsArr addObject:aStr];
                 [currentHrefArr addObject:hrefStr];

             }
 [htmlData release];
 [xpathParser release];
 }

 //如果解析的网页不是utf8编码，如gbk编码，可以先将其转换为utf8编码再对其进行解析

 -(NSData *) toUTF8:(NSData *)sourceData {
     CFStringRef gbkStr = CFStringCreateWithBytes(NULL, [sourceData bytes], [sourceData length],kCFStringEncodingGB_18030_2000, false);  

     if (gbkStr == NULL) {
         return nil;
     } else {
         NSString *gbkString = (NSString *)gbkStr;
         //根据网页源代码中编码方式进行修改，此处为从gbk转换为utf8
              NSString *utf8_String = [gbkString stringByReplacingOccurrencesOfString:@"META http-equiv="Content-Type" content="text/html; charset=GBK""
                                                                       withString:@"META http-equiv="Content-Type" content="text/html; charset=UTF-""];  

         return [utf8_String dataUsingEncoding:NSUTF8StringEncoding];
     }
 }

http://blog.csdn.net/majiakun1/article/details/39472489