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 }