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] > 0) {

            

            for (int i = 87; i < 102; 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:0];

                NSArray *aChild = [aEle children];

                TFHppleElement *aChildEle = [aChild objectAtIndex:0];

                NSArray *aChildren = [aChildEle children];

                NSString *aStr = [[aChildren objectAtIndex:0] 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-8""];  

        

        return [utf8_String dataUsingEncoding:NSUTF8StringEncoding];                            

    }                                     

}