DOM数据解析

//DOM : Document Object Model ,一种XML解析的方式,先读取整篇的内容,然后再进行解析,解析速度比较快,如果内出现错误,解析就会失败,iOS不支持DOM解析,goole提供了一个DOM解析的类库(GDataXMLNode)
    //注: 使用GDataXMLNode,需要进行2步设置,详情见GDataXMLNode.h 第30行

(1)
    
    
    self.studentArray = [NSMutableArray arrayWithCapacity:3];
    
//    GDataXMLDocument :用于去管理和读取文件内容
    
        //获取文件路径
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"xml"];
        //读取文件内容
    NSError *contentError = nil;

//如果出现错误
    if (contentError) {
        NSLog(@"%@", contentError);
    }
    
    NSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&contentError];

GDataXMLDocument *document = [[GDataXMLDocument alloc] initWithXMLString:content options:0 error:nil];
        //获取根节点
//    GDataXMLElement ,节点类
    GDataXMLElement *rootElement = [document rootElement];
    
        //找到student的节点
    NSArray *studentElements = [rootElement elementsForName:@"student"];
    
        //遍历所有的student节点,封装数据
    for (GDataXMLElement *element in studentElements) {
        NSLog(@"%@", element);
        Student *student = [[Student alloc] init];
        student.name = [[[element elementsForName:@"name"] firstObject] stringValue];
  student.sex = [[[element elementsForName:@"sex"] firstObject] stringValue];
        student.age = [[[element elementsForName:@"age"] firstObject] stringValue];
        [_studentArray addObject:student];
    }
    
        //打印封装好的数据
    for (Student *student in _studentArray) {
        NSLog(@"%@", student);
    }
(2)

<A>
    <B>
        <C>
            <D>1</D>
            <E>2</E>
        </C>
        <F>
            <D>3</D>
            <C>
                <D>4</D>
            </C>
        </F>
    </B>
</A>
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Xpath" ofType:@"xml"];
    
    NSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
    
    
    GDataXMLDocument *document = [[GDataXMLDocument alloc] initWithXMLString:content options:0 error:nil];
    
    GDataXMLElement *rootElement = [document rootElement];
    
        //xPath:路径检索,/代表绝对路径,//代表相对路径
        //例如:找到E 可以用//C/E 或者//E
    
    NSArray *elements = [rootElement nodesForXPath:@"//E" error:nil];
    NSLog(@"%@", elements);
    
    // Do any additional setup after loading the view.
}