GData解析XML文件

前端之家收集整理的这篇文章主要介绍了GData解析XML文件前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。

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

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>
<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>
<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
原文链接:https://www.f2er.com/xml/299163.html

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