GData解析XML文件

发布时间：2020-12-15 23:03:40 所属栏目：百科来源：网络整理

导读：如何将GData库引入自己的工程，我就不说了，这个网上一大堆。下面直接讲如何解析XML文件以http://api.douban.com/book/subjects?q=ios这个从豆瓣上请求的图书为例，下面是请求的内容 feed xmlns =" http://www.w3.org/2005/Atom " xmlns:db =" http://www.d

如何将GData库引入自己的工程，我就不说了，这个网上一大堆。下面直接讲如何解析XML文件

以http://api.douban.com/book/subjects?q=ios这个从豆瓣上请求的图书为例，下面是请求的内容

 
 <feedxmlns="http://www.w3.org/2005/Atom"xmlns:db="http://www.douban.com/xmlns/"xmlns:gd="http://schemas.google.com/g/2005"xmlns:openSearch="http://a9.com/-/spec/opensearchrss/1.0/"xmlns:opensearch="http://a9.com/-/spec/opensearchrss/1.0/"> 

 
  <title> 
  搜索 ios 的结果 
  </title> 
 
  <opensearch:startIndex> 
  1 
  </opensearch:startIndex> 
 
  <opensearch:totalResults> 
  810 
  </opensearch:totalResults> 
 
    <entry> 
    ... 
    </entry> 
   
    <entry> 
   
     <id>http://api.douban.com/book/subject/24846574</id> 
    
     <title>iOS开发指南：从零基础到App Store上架</title> 
    
     <categoryscheme="http://www.douban.com/2007#kind"term="http://www.douban.com/2007#book"/> 
    
       <author> 
      
        <name>关东升</name> 
       
       </author> 
      
     <linkhref="http://api.douban.com/book/subject/24846574"rel="self"/> 
    
     <linkhref="http://book.douban.com/subject/24846574/"rel="alternate"/> 
    
     <linkhref="http://img5.douban.com/spic/s26817976.jpg"rel="image"/> 
    
     <linkhref="http://m.douban.com/book/subject/24846574/"rel="mobile"/> 
    
     <db:attributename="isbn10">7115324441</db:attribute> 
    
     <db:attributename="isbn13">9787115324443</db:attribute> 
    
     <db:attributename="author">关东升</db:attribute> 
    
     <db:attributename="price">99.00</db:attribute> 
    
     <db:attributename="publisher">人民邮电出版社</db:attribute> 
    
     <db:attributename="pubdate">2013-7</db:attribute> 
    
     <gd:ratingaverage="0"max="10"min="0"numRaters="8"/> 
    
    </entry> 
   
    <entry> 
    ... 
    </entry> 
   
    <entry> 
    ... 
    </entry> 
   
    <entry> 
    ... 
    </entry> 
   
    <entry> 
    ... 
    </entry> 
   
    <entry> 
    ... 
    </entry> 
   
    <entry> 
    ... 
    </entry> 
   
    <entry> 
    ... 
    </entry> 
   
    <entry> 
    ... 
    </entry> 
   
  <opensearch:itemsPerPage> 
  10 
  </opensearch:itemsPerPage>

 
 </feed> 

上面红色字体是一本书所包含的全部信息，每本书都含有相同的内容，下面解析红色字体的全部内容

假设你已经使用ASIHttpRequest或者NSURLConnection或者其他的下载类讲这个XML文件的数据全部下载下来，并保存到（NSMutableData*）data中。

下面创建GDataXMLDocument类

NSError *error;
    GDataXMLDocument *doc=[[GDataXMLDocument alloc] initWithData:data options:0 error:&error];
    if (!doc) {
        return;
    }

下面获取所有的entry节点，这个有两种方法：

1、

GDataXMLElement * rootElement = [ doc rootElement];
    NSArray * arrays = [ rootElement elementsForName:@"entry"];

2、

NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys:@"http://www.w3.org/2005/Atom",@"xmlns",nil];
    NSArray *arrays=[doc nodesForXPath:@"/xmlns:feed/xmlns:entry" namespaces:dict error:&error];

获取entry节点下所有节点的信息

for (GDataXMLElement *element in array) {
        //<id>http://api.douban.com/book/subject/24846574</id>
        NSString * id = [[[ element elementsForName:@"id"]lastObject]stringValue];
        NSLog(@"nid --->%@",id);
        //<title>iOS开发指南：从零基础到App Store上架</title>
        NSString * title = [[[element elementsForName:@"title"]lastObject]stringValue];
        NSLog(@"ntitle --->%@",title);
        
        //<category scheme="http://www.douban.com/2007#kind" term="http://www.douban.com/2007#book"/>
        NSString * scheme = [[[[element elementsForName:@"category"]lastObject]attributeForName:@"scheme"]stringValue];
        NSLog(@"nscheme --->%@",scheme);
        
        NSString * term = [[[[element elementsForName:@"category"]lastObject]attributeForName:@"term"]stringValue];
        NSLog(@"nterm --->%@",term);
        /*
        <author>
        <name>关东升</name>
        </author>
         */
        NSString * name = [[[[[element elementsForName:@"author"]lastObject]elementsForName:@"name"]lastObject]stringValue];
        NSLog(@"nname --->%@",name);
        /*
         <link href="http://api.douban.com/book/subject/24846574" rel="self"/>
         <link href="http://book.douban.com/subject/24846574/" rel="alternate"/>
         <link href="http://img5.douban.com/spic/s26817976.jpg" rel="image"/>
         <link href="http://m.douban.com/book/subject/24846574/" rel="mobile"/>
         获取image的URL,其他的类推
         */
        NSArray * links = [element elementsForName:@"link"];
        for (GDataXMLElement * https in links) {
            GDataXMLNode * node = [https attributeForName:@"rel"];
            if ([[node stringValue] isEqualToString:@"image"]) {
                GDataXMLNode * imageNOde = [https attributeForName:@"href"];
                NSString * imageUrl = [imageNOde stringValue];
                NSLog(@"nimageUrl ---> %@",imageUrl);
            }
        }
        
        /*
        <db:attribute name="isbn10">7115324441</db:attribute>
        <db:attribute name="isbn13">9787115324443</db:attribute>
        <db:attribute name="author">关东升</db:attribute>
        <db:attribute name="price">99.00</db:attribute>
        <db:attribute name="publisher">人民邮电出版社</db:attribute>
        <db:attribute name="pubdate">2013-7</db:attribute>
         获取出版社，其他的类推
        */
        NSArray * attributeArray = [element elementsForName:@"db:attribute"];
        for (GDataXMLElement * element in attributeArray) {
            if ([[[element attributeForName:@"name"]stringValue] isEqualToString:@"publisher"]) {
                NSString * publisherName = [element stringValue];
                NSLog(@"npublisherName --->%@",publisherName);
            }
        }
}








控制台输出结果：
id --->http://api.douban.com/book/subject/21356354
2014-02-17 15:20:48.970 DoubanDemo2[1678:70b] 
title --->iOS编程
2014-02-17 15:20:48.971 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.971 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.971 DoubanDemo2[1678:70b] 
name --->Aaron Hillegass
2014-02-17 15:20:48.971 DoubanDemo2[1678:70b] 
imageUrl ---> http://img5.douban.com/spic/s25011757.jpg
2014-02-17 15:20:48.972 DoubanDemo2[1678:70b] 
publisherName --->华中科技大学出版社
2014-02-17 15:20:48.972 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/24846574
2014-02-17 15:20:48.972 DoubanDemo2[1678:70b] 
title --->iOS开发指南：从零基础到App Store上架
2014-02-17 15:20:48.972 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.972 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.973 DoubanDemo2[1678:70b] 
name --->关东升
2014-02-17 15:20:48.973 DoubanDemo2[1678:70b] 
imageUrl ---> http://img5.douban.com/spic/s26817976.jpg
2014-02-17 15:20:48.973 DoubanDemo2[1678:70b] 
publisherName --->人民邮电出版社
2014-02-17 15:20:48.973 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/6392055
2014-02-17 15:20:48.974 DoubanDemo2[1678:70b] 
title --->iOS软件开发揭密
2014-02-17 15:20:48.974 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.974 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.975 DoubanDemo2[1678:70b] 
name --->虞斌
2014-02-17 15:20:48.975 DoubanDemo2[1678:70b] 
imageUrl ---> http://img5.douban.com/spic/s6477176.jpg
2014-02-17 15:20:48.975 DoubanDemo2[1678:70b] 
publisherName --->电子工业出版社
2014-02-17 15:20:48.976 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/25782512
2014-02-17 15:20:48.976 DoubanDemo2[1678:70b] 
title --->IOS 7:iPhone/iPad应用开发技术详解
2014-02-17 15:20:48.976 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.976 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.977 DoubanDemo2[1678:70b] 
name --->刘一道
2014-02-17 15:20:48.977 DoubanDemo2[1678:70b] 
imageUrl ---> http://img3.douban.com/spic/s27163550.jpg
2014-02-17 15:20:48.977 DoubanDemo2[1678:70b] 
publisherName --->机械工业出版社
2014-02-17 15:20:48.977 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/11610941
2014-02-17 15:20:48.978 DoubanDemo2[1678:70b] 
title --->iOS 5基础教程
2014-02-17 15:20:48.978 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.978 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.978 DoubanDemo2[1678:70b] 
name --->[美] Jeff LaMarche
2014-02-17 15:20:48.978 DoubanDemo2[1678:70b] 
imageUrl ---> http://img3.douban.com/spic/s11190761.jpg
2014-02-17 15:20:48.979 DoubanDemo2[1678:70b] 
publisherName --->人民邮电出版社
2014-02-17 15:20:48.979 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/19962787
2014-02-17 15:20:48.979 DoubanDemo2[1678:70b] 
title --->Objective-C编程
2014-02-17 15:20:48.980 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.980 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.980 DoubanDemo2[1678:70b] 
name --->[美] Aaron Hillegass
2014-02-17 15:20:48.980 DoubanDemo2[1678:70b] 
imageUrl ---> http://img3.douban.com/spic/s22704633.jpg
2014-02-17 15:20:48.981 DoubanDemo2[1678:70b] 
publisherName --->华中科技大学出版社
2014-02-17 15:20:48.981 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/19967897
2014-02-17 15:20:48.981 DoubanDemo2[1678:70b] 
title --->Objective-C 程序设计
2014-02-17 15:20:48.982 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.982 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.982 DoubanDemo2[1678:70b] 
name --->斯蒂芬·G·科昌
2014-02-17 15:20:48.982 DoubanDemo2[1678:70b] 
imageUrl ---> http://img3.douban.com/spic/s22783480.jpg
2014-02-17 15:20:48.982 DoubanDemo2[1678:70b] 
publisherName --->电子工业出版社
2014-02-17 15:20:48.982 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/6920082
2014-02-17 15:20:48.983 DoubanDemo2[1678:70b] 
title --->Objective-C编程之道
2014-02-17 15:20:48.983 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.983 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.983 DoubanDemo2[1678:70b] 
name --->钟冠贤
2014-02-17 15:20:48.983 DoubanDemo2[1678:70b] 
imageUrl ---> http://img3.douban.com/spic/s8855033.jpg
2014-02-17 15:20:48.983 DoubanDemo2[1678:70b] 
publisherName --->人民邮电
2014-02-17 15:20:48.984 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/3948373
2014-02-17 15:20:48.984 DoubanDemo2[1678:70b] 
title --->Objective-C 2.0程序设计
2014-02-17 15:20:48.984 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.984 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.984 DoubanDemo2[1678:70b] 
name --->Stephen G. Kochan
2014-02-17 15:20:48.984 DoubanDemo2[1678:70b] 
imageUrl ---> http://img3.douban.com/spic/s3957362.jpg
2014-02-17 15:20:48.985 DoubanDemo2[1678:70b] 
publisherName --->机械工业出版社
2014-02-17 15:20:48.985 DoubanDemo2[1678:70b] 
id --->http://api.douban.com/book/subject/3604295
2014-02-17 15:20:48.985 DoubanDemo2[1678:70b] 
title --->iPhone开发基础教程
2014-02-17 15:20:48.985 DoubanDemo2[1678:70b] 
scheme --->http://www.douban.com/2007#kind
2014-02-17 15:20:48.985 DoubanDemo2[1678:70b] 
term --->http://www.douban.com/2007#book
2014-02-17 15:20:48.985 DoubanDemo2[1678:70b] 
name --->Jeff LaMarche
2014-02-17 15:20:48.986 DoubanDemo2[1678:70b] 
imageUrl ---> http://img5.douban.com/spic/s3664046.jpg
2014-02-17 15:20:48.986 DoubanDemo2[1678:70b] 
publisherName --->人民邮电出版社

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!