iOS之数据解析之XML解析详解

-(void)xmlDOMMethed{

  //盛放所有的字典
 self.sourceArray = [NSMutableArray array];
  //setp1.得到需要解析的数据
  NSString *xmlPath = [[NSBundle mainBundle] pathForResource:@"XMLDemo" ofType:@"xml"];
  //step2.转换为NSData类型
  NSData *xmlData = [NSData dataWithContentsOfFile:xmlPath];
  //step3.1 构建document文档对象(options预留参数)
  GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:xmlData options:0 error:nil];
  //step3.2 找到根节点(students)
  GDataXMLElement *rootElement = [doc rootElement];
 //step3.3 找到根节点的所有子节点
  NSArray *allSubNotes = [rootElement elementsForName:@"student"];
  //step3.3 找到student节点的所有子节点
  for (GDataXMLElement *item in allSubNotes) {

    //每次循环开始的时候,说明是一个新的student节点,我们需要字典来盛放它所有的值
    NSMutableDictionary *studentDic = [NSMutableDictionary dictionary];
    //得到name节点
    NSArray *nameArray = [item elementsForName:@"name"];
    GDataXMLElement *nameElement = [nameArray objectAtIndex:0];
    NSString *name = [nameElement stringValue];
    [studentDic setObject:name forKey:@"name"];

    //取出age
    NSArray *ageArray = [item elementsForName:@"age"];
    GDataXMLElement *ageElement = [ageArray objectAtIndex:0];
    NSString *age = [ageElement stringValue];
    [studentDic setObject:age forKey:@"age"];

    //取出sex
    NSArray *sexArray = [item elementsForName:@"sex"];
    GDataXMLElement *sexElement = [sexArray objectAtIndex:0];
    NSString *sex = [sexElement stringValue];
    [studentDic setObject:sex forKey:@"sex"];
    //把student字典添加到数组中
    [self.sourceArray addObject:studentDic];
  }
NSLog(@"%@",self.sourceArray);
 }

//通过dom解析方式为xml增加节点 (sax只可以读取，不可以添加)
- (void)domAddNote{
  //获得文件路径
  NSString *xmlPath = [[NSBundle mainBundle] pathForResource:@"XMLDemo" ofType:@"xml"];
  //将文件转换为data类型
  NSData *xmlData = [NSData dataWithContentsOfFile:xmlPath];

  GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:xmlData options:0 error:nil];
  GDataXMLElement *rootElement = [doc rootElement];
  //创建一个我们需要添加的节点(student)
  GDataXMLElement *createElement = [GDataXMLElement elementWithName:@"student"];
  //为student节点添加属性
  [createElement addAttribute:[GDataXMLElement attributeWithName:@"attribute" stringValue:@"aa"]];
  //为student节点添加子节点
  GDataXMLElement *nameNode = [GDataXMLElement elementWithName:@"name" stringValue:@"美丽"];
  [createElement addChild:nameNode];
  GDataXMLElement *ageNode = [GDataXMLElement elementWithName:@"age" stringValue:@"18"];
  [createElement addChild:ageNode];
  GDataXMLElement *sexNode = [GDataXMLElement elementWithName:@"sex" stringValue:@"男"];
  [createElement addChild:sexNode];

  //将创建好的student节点，添加到根节点，也就是students节点下
  [rootElement addChild:createElement];

  //得到所有的student节点
  NSArray *stuElementArray = [rootElement elementsForName:@"student"];

  //遍历得到每个student节点，以便获得student的子节点的值。
  for (GDataXMLElement* item in stuElementArray) {

    //获得student节点的attribute属性值
    NSLog(@"%@",[[item attributeForName:@"attribute"] stringValue]);

    NSArray *nameArray = [item elementsForName:@"name"];
    GDataXMLElement *nameElement = [nameArray objectAtIndex:0];
    NSString *name = [nameElement stringValue];

    //取出age
    NSArray *ageArray = [item elementsForName:@"age"];
    GDataXMLElement *ageElement = [ageArray objectAtIndex:0];
    NSString *age = [ageElement stringValue];
        //取出sex
    NSArray *sexArray = [item elementsForName:@"sex"];
    GDataXMLElement *sexElement = [sexArray objectAtIndex:0];
    NSString *sex = [sexElement stringValue];
    NSLog(@"name=%@---age=%@----sex=%@",name,age,sex);
  }
}

//遵循协议
@interface rootViewController ()<NSXMLParserDelegate>

//xml解析之sax解析
-(void)xmlSaxMethod{
 //得到需要解析的数据
 NSString *xmlPath = [[NSBundle mainBundle] pathForResource:@"XMLDemo" ofType:@"xml"];
 NSData *xmlData = [NSData dataWithContentsOfFile:xmlPath];
 //创建sax解析的工具类对象
 NSXMLParser *saxParser = [[NSXMLParser alloc] initWithData:xmlData];
 //指定代理
 saxParser.delegate = self;
 //开始解析 sax解析是一个同步的过程
 BOOL isParse = [saxParser parse];
 if (isParse) {

   NSLog(@"解析完成");
 }else{
   NSLog(@"解析失败");
 }
 NSLog(@"我是在解析结束下面");
}

//开始解析的代理方法
-(void)parserDidStartDocument:(NSXMLParser *)parser {
 NSLog(@"开始解析");
 self.saxArray = [NSMutableArray array]; 
}
//开始解析某个节点
//elementName:标签名称
//namespaceURI:命名空间指向的链接
//qName:命名空间的名称
//attributeDict:节点的所有属性
-(void)parser:(NSXMLParser )parser didStartElement:(NSString )elementName namespaceURI:(NSString )namespaceURI qualifiedName:(NSString )qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict {
 NSLog(@"开始解析%@节点",elementName);
 //当开始解析student标签的时候,就应该初始化字典,因为一个字典就对应的是一个学生的信息
 if ([elementName isEqualToString:@"student"]) {
   self.saxDic = [NSMutableDictionary dictionary];
 }
}
//获取节点之间的值
-(void)parser:(NSXMLParser )parser foundCharacters:(NSString )string {
 NSLog(@"取值--------%@",string);
 if (self.valueString) {//说明有值
   [self.valueString appendString:string];
 } else {
   self.valueString = [NSMutableString stringWithString:string];
 }
}
//某个节点结束取值


-(void)parser:(NSXMLParser )parser didEndElement:(NSString )elementName namespaceURI:(NSString )namespaceURI qualifiedName:(NSString )qName {
 if ([elementName isEqualToString:@"name"]) {//说明name节点已经取值结束
 [self.saxDic setObject:self.valueString forKey:elementName];
 }
 if ([elementName isEqualToString:@"age"]) {
 [self.saxDic setObject:self.valueString forKey:elementName];
 }
 if ([elementName isEqualToString:@"sex"]) {
 [self.saxDic setObject:self.valueString forKey:elementName];
 }
 if ([elementName isEqualToString:@"student"]) {
 [self.saxArray addObject:self.saxDic];
 }
 self.valueString = nil;//置空
 NSLog(@"结束%@节点的解析",elementName);
}


//结束解析


-(void)parserDidEndDocument:(NSXMLParser *)parser {
 //可以使用解析完成的数据
 NSLog(@"%@",self.saxArray);
 NSLog(@"整个解析结束");
}

//解析出错

-(void)parser:(NSXMLParser )parser parseErrorOccurred:(NSError )parseError {
 NSLog(@"解析出现错误-------%@",parseError.description);
}