数据解析(SAX, JSON)

            
                解析文件
                
Student.xml
<Students>
    <student>
          <name>蹦蹦</name>
          <age>24</age>
          <gender>男</gender>
    </student>
    <student>
            <name>张三</name>
            <age>18</age>
            <gender>女</gender>
    </student>
    <student>
            <name>李四</name>
            <age>20</age>
            <gender>男</gender>
    </student>
</Students>

- (IBAction)sax:(UIButton *)sender {
  NSXMLParser, XML解析类, sax方式, 继承于NSObject  
    //文件的路径
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"xml"];
    //NSURL, 统一资源定位符
    NSURL *url = [NSURL fileURLWithPath:path];
    //创建解析类
    NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
    //设置代理, 解析的过程在delegate方法中实现
    parser.delegate = self;
    //开始解析    [parser parse];
    //释放    [parser release];
}

            #pragma mark - NSXMLParserDelegate
- (void)parserDidStartDocument:(NSXMLParser *)parser {
    NSLog(@"文档已经开始解析");
    self.studentArray = [NSMutableArray arrayWithCapacity:3];
}

- (void)parserDidEndDocument:(NSXMLParser *)parser {
    NSLog(@"文档已经结束解析");
    NSLog(@"%@", self.studentArray);
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {
    NSLog(@"遇到开始标签%@", elementName);
    if ([elementName isEqualToString:@"student"]) {
        student = [[Student alloc] init];
    }
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
     NSLog(@"遇到结束标签%@", elementName);
    if ([elementName isEqualToString:@"name"]) {
        student.name = _content;
    } elseif ([elementName isEqualToString:@"age"]) {
        student.age = _content;
    } elseif([elementName isEqualToString:@"gender"] ){
        student.gender = _content;
    } elseif([elementName isEqualToString:@"student"]){
        [self.studentArray addObject:student];
        NSLog(@"%@", student);
        [student release];
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
    NSLog(@"遇到内容%@", string);
    self.content = string;
}

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

            - (IBAction)dom:(UIButton *)sender {获取文件路径
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"xml"];
    根据文件路径, 找到文件, 读取文件内容
    //注: 默认MaxOS下地文字编码格式是UTF-8
    NSString *content = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"%@", content);
    GDataXMLDocument: 用于读取文档
    NSError *error = nil;
    GDataXMLDocument *document = [[GDataXMLDocument alloc] initWithXMLString:content options:0 error:&error];
    内容读完以后, 可以分析出整个XML数据的结构
    
    //找根节点
    GDataXMLElement *rootElement = [document rootElement];
    //通过节点名, 找子节点
    NSArray *elements = [rootElement elementsForName:@"student"];
    self.studentArray = [NSMutableArray arrayWithCapacity:3];
    //遍历节点数组for (GDataXMLElement *ele in elements) {
        //创建学生对象
        Student *stu = [[Student alloc] init];
        //赋值
        stu.name =  [[[ele elementsForName:@"name"] firstObject] stringValue];
        stu.age = [[[ele elementsForName:@"age"] firstObject] stringValue];
        stu.gender = [[[ele elementsForName:@"gender"] firstObject] stringValue];
        //添加到数组中        [self.studentArray addObject:stu];
        //释放        [stu release];
    }
    NSLog(@"%@", self.studentArray);
    
    XPath: 路径检索
    GDataXMLNode是支持XPath的
    // /: 绝对路径 @"student/name"  //: 相对路径 @"//name"
    NSArray *names = [rootElement nodesForXPath:@"//name" error:nil];
    for (GDataXMLElement *ele in names) {
         NSLog(@"%@", [ele stringValue]);
    }
}

        

            
                
                    解析文件
                    

                    Student.json
[
 {
    
                "
                name
                ": "强强",
    "age": "18",
    "gender": "男"
 },
 {
    "name": "蹦蹦",
    "age": "28",
    "gender": "男"
 },
 {
    "name": "忠忠",
    "age": "38",
    "gender": "男"
 }
 ]
        

            - (IBAction)apple:(UIButton *)sender {
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"json"];
    NSData, 二进制数据, 继承于NSObject
    NSData *data = [NSData dataWithContentsOfFile:path];
    NSJSONSerialization, JSON解析类(序列化), 继承于NSObject
    参数1: 二进制数据
    参数2: options: NSJSONReadingOptions:
    NSJSONReadingMutableContainers, 生成的数组和字典是可变的
    NSJSONReadingMutableLeaves, 生成的字符串是可变的
    NSJSONReadingAllowFragments, 允许最外层不是数组或字典
    NSError *error = nil;
    NSMutableArray *array = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
    if (error) {
         NSLog(@"%@", error);
    } else {
        NSLog(@"%@", array);
    }
    
    //数据的封装
    self.studentArray = [NSMutableArray arrayWithCapacity:3];
    for (NSMutableDictionary *dic in array) {
        //1
//        Student *stu = [[Student alloc] init];
//        stu.name = dic[@"name"];
//        stu.age = dic[@"age"];
//        stu.gender = dic[@"gender"];
        
        2.KVC
        Student *stu = [[Student alloc] init];
        [stu setValuesForKeysWithDictionary:dic];
        NSLog(@"%@", stu);
        
        [self.studentArray addObject:stu];
        [stu release];
    }
    NSLog(@"%@", _studentArray);
}
        

- (IBAction)vendor:(UIButton *)sender {
    //获取文件路径
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"json"];
    //获取二进制数据
    NSData *data = [NSData dataWithContentsOfFile:path];
    NSArray *array = [data objectFromJSONData];
    NSLog(@"%@", array);
}