Day 15

XML

Student.xml

<?xml version ="1.0" encoding="UTF-8" ?>
<students><student><name>gold one</name><age>74</age><gender>mu</gender></student><student><name>gold two</name><age>73</age><gender>gong</gender></student><student><name>gold three</name><age>67</age><gender>mu</gender></student>
</students>

SAX:
1. 容错性
2. 逐行读取，不一次性获取全部
3. 可以控制过程
4. （基于事件驱动的）

DOM:
1. 全部读取
2. 写起来方便
3. 将XML结构化成树状

sax解析
XMLViewController.m

#pragma mark - sax解析方式
- (IBAction)saxButtonAction:(UIButton *)sender
{// 1. 获取文件路径NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"xml"];// 2. 使用NSData去接受NSData *data = [NSData dataWithContentsOfFile:filePath];NSLog(@"%@", data);// 3. 创建解析对象NSXMLParser *parser = [[[NSXMLParser alloc] initWithData:data] autorelease];// 3.1 设置代理parser.delegate = self;// 4. 开始解析[parser parse];
}
#pragma mark 开始解析文档
- (void)parserDidStartDocument:(NSXMLParser *)parser
{// 1. 创建数组self.allDataArray = [NSMutableArray array];
}#pragma mark 开始解析标签
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{// 2. 保存当前标签_currentElementStr = elementName;// 3. 判断当前标签是否属Stedentif ([elementName isEqualToString:@"student"]) {// 创建并添加Student *stu = [[Student new] autorelease];[_allDataArray addObject:stu];}
}#pragma mark 获取值
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{// 4. 获取接受值的对象Student *stu = _allDataArray.lastObject;if ([_currentElementStr isEqualToString:@"name"]) {stu.name = string;} else if([_currentElementStr isEqualToString:@"age"]) {stu.age = string;} else if ([_currentElementStr isEqualToString:@"gender"]) {stu.gender = string;}
}#pragma mark 结束解析标签
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{_currentElementStr = nil;
}#pragma mark 结束解析文档
- (void)parserDidEndDocument:(NSXMLParser *)parser
{NSLog(@"%@", _allDataArray);
}

dom解析

- (IBAction)domButtonAction:(UIButton *)sender
{// 1. 获取路径NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"xml"];// 2. 获取数据NSData *data = [NSData dataWithContentsOfFile:filePath];// 3. 创建解析对象GDataXMLDocument *document = [[[GDataXMLDocument alloc] initWithData:data options:0 error:nil] autorelease];// 4. 获取根节点GDataXMLElement *rootElement = document.rootElement;// 5. 创建大数组self.allDataArray = [NSMutableArray array];// 6. 遍历根节点下的所有子节点for (GDataXMLElement *stuElement in rootElement.children) {// 7. 有多少个student节点，就创建多少个stu对象Student *stu = [Student new];// 8. 遍历student节点下的子节点for (GDataXMLElement *subStuElement in stuElement.children) {// 9. 通过KVC的方式将name/age/gender节点中的值赋给stu对象[stu setValue:subStuElement.stringValue forKey:subStuElement.name];}// 10. 将创建好的stu添加到大数组中[_allDataArray addObject:stu];[stu release];}// 11. 打印值NSLog(@"%@", _allDataArray);}

JSON

（十分之九）

Student.json

[{"name":"jinyi","age":12,"gender":"ci"},{"name":"jinwu","age":17,"gender":"xiong"},{"name":"qinshu","age":12,"gender":"男"}
]

JSONViewController.m

- (IBAction)systemButtonAction:(UIButton *)sender
{// 1. 获取路径NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student.json" ofType:nil];// 2. 获取数据NSData *data = [[NSData alloc] initWithContentsOfFile:filePath];// 3. 解析NSArray *arr = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];NSLog(@"%@", arr);
}

jsonKit

#pragma mark 第三方
- (IBAction)otherButtonAction:(UIButton *)sender
{NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student.json" ofType:nil];NSData *data = [[NSData alloc] initWithContentsOfFile:filePath];NSArray *resultDict = [data objectFromJSONData];// 4.转化成json格式NSString *jsonStr = [resultDict JSONString];NSLog(@"%@", resultDict);NSLog(@"%@", jsonStr);
}

JSON & XML 的区别

JSON占用空间少
XML易读，JSON不易读
对于解析来说，JSON的难度为0
JSON轻量级，也是最常用的一种格式
XML特点是标签，没有类型，全都是字符串
JSON有：数组、对象、字符串、数字、BOOL。。。

UI_XMLJSON

Day 15

XML

JSON

jsonKit

JSON & XML 的区别

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