iOS xml 解析方法有两种:SAX , DOM.

SAX 不用借助第三方,在解析过程中逐行解析.(NSXMLParser,需要实现代理),具体步骤:

1.获取文件路径.

2.创建 NSXMLParser 对象.

3.遵守协议,设置代理.

4.实现代理方法

　　1>- (void)parserDidStartDocument:  ---- 开始解析

　　2>- (void)parserDidEndDocument: ----解析结束

　　3>- (void)parser:didStartElement:namespaceURI:qualifiedName:attributes: ----遇到开始标签

　　4>- (void)parser:didEndElement:namespaceURI:qualifiedName: ----遇到结束标签

　　5>- (void)parser: foundCharacters:  -----遇到值

详细代码:

 1 - (IBAction)xmlParserWithSAX:(id)sender {
 2     
 3     //获取文件路径
 4     NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"xml"];
 5     //转换为url
 6     NSURL *url = [[NSURL alloc]initFileURLWithPath:filePath];
 7     //创建 NSXMLParser 对象
 8     NSXMLParser *parser = [[NSXMLParser alloc]initWithContentsOfURL:url];
 9     parser.delegate = self;
10     //开始解析
11     [parser parse];
12 }

代理方法实现:

 1 /**
 2  *  开始解析 xml
 3  */
 4 - (void)parserDidStartDocument:(NSXMLParser *)parser{
 5     NSLog(@"开始解析");
 6     self.studentArray = [[NSMutableArray alloc]init];
 7 }
 8 
 9 
10 /**
11  *  结束解析 xml
12  */
13 - (void)parserDidEndDocument:(NSXMLParser *)parser{
14     NSLog(@"解析结束");
15     for (StudentModel *stu in self.studentArray) {
16         NSLog(@"%@",stu);
17     }
18 }
19 
20 /**
21  *  遇到开始标签
22  */
23 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict{
24     NSLog(@"遇到开始节点:%@",elementName);
25     if ([elementName isEqualToString:@"student"]) {
26         self.studentModel = [[StudentModel alloc]init];
27     }
28 }
29 
30 /**
31  *  遇到结束标签
32  */
33 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
34     NSLog(@"遇到结束节点:%@",elementName);
35    if ([elementName isEqualToString:@"name"]){
36         self.studentModel.name = self.str;
37     }else if ([elementName isEqualToString:@"age"]){
38         self.studentModel.age = self.str;
39     }else if ([elementName isEqualToString:@"gender"]){
40         self.studentModel.gender = self.str;
41     }else if ([elementName isEqualToString:@"student"]) {
42         [self.studentArray addObject:self.studentModel];
43     }
44 }
45 
46 /**
47  *  遇到的值
48  */
49 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
50     NSLog(@"%@",string);
51     self.str = string;
52 }

DOM 解析,先获取全部文件内容,找出层次结构,需要用到第三方(GDataXMLNode).具体步骤:

1.修改配置 Header Search Paths 加上:/usr/include/libxml2  

　　Other Linker Flags  加上:-lxml2

2.获取文件路径

3.获取文件内容

4.获取 xml 结构

5.遍历节点取值

详细代码:

 1 - (IBAction)xmlParserWithDOM:(id)sender {
 2     
 3     //获取文件地址
 4     NSString *filPath = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"xml"];
 5     NSError *error = nil;
 6     //获取文件内容
 7     NSString *contact = [NSString stringWithContentsOfFile:filPath encoding:NSUTF8StringEncoding error:&error];
 8     if (error == nil) {
 9         NSLog(@"%@",contact);
10     }else {
11         NSLog(@"%@",error);
12     }
13     //第三方
14     GDataXMLDocument *document = [[GDataXMLDocument alloc]initWithXMLString:contact options:0 error:nil];
15     
16     //获取 xml 根节点
17     GDataXMLElement *rootElement = [document rootElement];
18     
19     //获取 根节点包含的节点
20     NSArray *array = [rootElement elementsForName:@"student"];
21     
22     NSMutableArray *arr = [[NSMutableArray alloc]init];
23     
24     //遍历节点,取值
25     for (GDataXMLElement *ele in array) {
26         StudentModel *model = [[StudentModel alloc]init];
27         model.name = [[[ele elementsForName:@"name"] firstObject] stringValue];
28         model.age = [[[ele elementsForName:@"age"] firstObject] stringValue];
29         model.gender = [[[ele elementsForName:@"gender"] firstObject] stringValue];
30         [arr addObject:model];
31         
32     }
33     
34     for (StudentModel *stu in arr) {
35         NSLog(@"%@",stu);
36     }
37     
38 }

GDataXMLNode.zip 下载