Two commonly used parsing methods in iOS use XML and Json
1. XML
XML: Extensible Markup Language (Extensible Markup Language ) , one of the mainstream data, can be used to store and transmit data
Two XML parsing methods: SAX parsing, DOM parsing (one more PULL parsing in Android)
SAX parsing : (need to introduce < NSXMLParserDelegate>)
simple API for XML is an event-based parsing method, which parses data line by line (using a protocol callback mechanism)
SAX specific usage
- (void)SexXmlAction {
// simulate getting data from the network
NSString *path = [[NSBundlemainBundle]pathForResource:@"message"ofType:@"txt"];
NSData *data = [NSDatadataWithContentsOfFile:path];
// start parsing
// 1. Create a parsing object and bind data
NSXMLParser *parser = [[NSXMLParseralloc] initWithData:data];
// 2 , specify the proxy
parser.delegate = self;
// 3 , start parsing
[parser parse];
}
// 4 , the method of implementing the proxy
// Start parsing the document
- (void)parserDidStartDocument:(NSXMLParser *)parser {
// NSLog(@" Start parsing the document ");
self.data = [NSMutableArrayarray];
}
// Start parsing tags
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict {
// NSLog(@" Start parsing tags ");
if ([elementName isEqualToString:@"person"]) {
Person *p = [[Personalloc] init];
[self.dataaddObject:p];
}
self.currentElement = elementName;
self.tempString = [NSMutableStringstring];
}
// Parse the intermediate data item
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
// NSLog(@" parse intermediate data item ");
// NSLog(@"%@",string);
[self.tempString appendString:string];
}
// end parsing tag
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
Person *p = [self.datalastObject];
// 利用KVC进行属性赋值
[p setValue:self.tempStringforKey:self.currentElement];
// NSLog(@"结束解析标签");
self.currentElement =nil;
self.tempString =nil;
}
// 结束解析文档
- (void)parserDidEndDocument:(NSXMLParser *)parser {
// NSLog(@"结束解析文档");
for (Person *pin self.data) {
NSLog(@"%@ -- %@ -- %@",p.name, p.sex, p.info);
}
}
// 文档出错之后
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
NSLog(@"OMG,文档有毒！！！！！");
}
* DOM -> document object model(文档对象模型)
* 解析的时候，将文档整体的读入，并将XML结构化成树状，使用时，通过树枝来获取
* DOM 解析方式比较好的一个实现是Google提供的GData，是开源的，他是对libxml.dylib的封装，也就是说需要导入类库
*
*
第一步， 导入GData文件，配置环境文件，添加libxml2.tbd
第二步， 在bulid setting 中 Head Search Path 中 添加进入 ${SDK_ROOT}/usr/include/libxml2
第三步， 在bulid phases 中第二个中 GData、 JSonKit 中添加 -fno-objc-arc (ARC MRC混编)(下面需要使用Json解析，同样也需要在同一个地方添加同样的语句， 因此都写在这里)
*
- (void)DomXmlAction {
// 模拟从网络上拿到数据
NSString *path = [[NSBundlemainBundle]pathForResource:@"message"ofType:@"txt"];
NSData *data = [NSDatadataWithContentsOfFile:path];
// 开始解析
// 1、创建解析对象
GDataXMLDocument *doc = [[GDataXMLDocumentalloc] initWithData:data options:0error:nil];
// 2、拿到根节点
GDataXMLElement *root = doc.rootElement;
// 拿到子节点
NSArray *modelArray = root.children;
// 初始化data数组
self.data = [NSMutableArrayarray];
// 遍历数组取到每一个model对应的节点
for (GDataXMLElement *modelElein modelArray) {
Person *p = [[Personalloc] init];
// 获得属性节点数组
NSArray *proArray = modelEle.children;
for (GDataXMLElement * proElein proArray) {
[p setValue:proEle.stringValueforKey:proEle.name];
}
[self.dataaddObject:p];
NSLog(@"%@--%@--%@", p.name, p.sex, p.info);
}
}
#pragma mark---------- 使用jsonKit 进行解析 (使用第三方)
- (void)JSONKitAction {
// 模拟从网络上获取数据
NSString *path = [[NSBundlemainBundle]pathForResource:@"Json"ofType:@"txt"];
NSData *data = [NSDatadataWithContentsOfFile:path];
//1 直接从data中拿对象
NSArray *array = [data objectFromJSONData];
//2 初始化数组
self.data = [NSMutableArrayarray];
//3 遍历数组
for (NSDictionary *dicin array) {
Person *p = [[Personalloc] init];
[p setValuesForKeysWithDictionary:dic];
[self.dataaddObject:p];
}
// 循环打印，查看结果
for (Person *pin self.data) {
NSLog(@"%@-- %@ -- %@",p.name, p.sex, p.info);
}
}
#pragma mark---------- 利用系统提供的类进行JSON解析
- (void)JsonSerializationActoin {
// 模拟从网络上获取数据
NSString *path = [[NSBundlemainBundle]pathForResource:@"Json"ofType:@"txt"];
NSData *data = [NSDatadataWithContentsOfFile:path];
NSArray *array = [NSJSONSerializationJSONObjectWithData:data options:NSJSONReadingAllowFragmentserror:nil];
self.data = [NSMutableArrayarray];
for (NSDictionary *dicin array) {
Person * p = [[Personalloc] init];
[p setValuesForKeysWithDictionary:dic];
[self.dataaddObject:p];
}
for (Person *pin self.data) {
NSLog(@"%@-- %@ -- %@",p.name, p.sex, p.info);
}
}