零基础iOS之Json及XML数据解析

 1 #pragma  mark  1,json解析
    //json解析
    //1,获取文件路径
    NSString *path = [[NSBundle mainBundle]pathForResource:@"Student" ofType:@"json"];
    
    //2，根据文件路径将其转成2进制数据
    NSData *data = [NSData dataWithContentsOfFile:path];
    
    //3.将二进制数据转为对象类型数据
    NSError *error = nil;//一个星号代表对象，两个星号代表对象取地址
    NSArray *array = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
    
    NSMutableArray *arr = [NSMutableArray array];//存放stu模型的数组
    
    for (NSDictionary *dic in array) {
        
        Student *stu = [[Student alloc] init];
        [stu setValuesForKeysWithDictionary:dic];//字典转模型
        
        [arr addObject:stu];
    }
    NSLog(@"%ld",arr.count);

第三方json数据解析，首先引进JSONKit类

#pragma mark  2,第三方json解析
    //1.获取文件路径
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"json"];
    //2.转二进制
    NSData *data = [NSData dataWithContentsOfFile:path];
    //3.将二进制数据转化为对象
    NSArray *array = [data objectFromJSONData];
    
    //将数据和model类对应
    NSMutableArray *arr = [NSMutableArray array];
    for (NSDictionary *dic in array) {
        Student *stu = [[Student alloc] init];
        [stu setValuesForKeysWithDictionary:dic];
        [arr addObject:stu];
    }
    NSLog(@"%ld",arr.count);

注意：系统与第三方区别，第三方对Json文件格式要求更加严格！

 

常用Json数据解析，XML步骤繁琐，不常用：

一、第三方（谷歌）

1.引进第三方GDataXMLNode

2.在build phases 里添加libxml2.dllib动态库

3.在build setting 里搜索 header search path 添加路径 /usr/include/libxml2

4.在build setting 里搜索 other link flag 添加 -lxml2

 

#pragma mark -XML之DOM解析
    //1.获取文件路径
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Person" ofType:@"xml"];
    //2.路径转化为字符串
    NSString *str =[NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    //3.将字符串转为xml类型数据
    GDataXMLDocument *document = [[GDataXMLDocument alloc] initWithXMLString:str options:0 error:nil];
    //4.获取根节点
    GDataXMLElement *root = [document rootElement];
    //5.根据根节点去取数据
    NSArray *arr = [root elementsForName:@"person"];
    //6.对数组遍历
    self.dataArr = [NSMutableArray array];
    for (int i = 0; i < arr.count; i++) {
        Person *p = [[Person alloc] init];
        NSArray *nameArr = [arr[i] elementsForName:@"name"];
        p.name = nameArr[0];
        NSArray *sexArr = [arr[i] elementsForName:@"sex"];
        p.sex = sexArr[0];
        NSArray *numberArr = [arr[i] elementsForName:@"number"];
        p.number = numberArr[0];
        NSArray *phoneArr = [arr[i] elementsForName:@"phone"];
        p.phone = phoneArr[0];
        [self.dataArr addObject:p];
    }
    NSLog(@"%ld",self.dataArr.count);

二、系统自带方法 代理

#pragma mark - XML之SAX解析
    //1.获取文件路径
    self.dataArr = [NSMutableArray array];
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Person" ofType:@"xml"];
    //2.根据文件路径转化为二进制数据
    NSData *data = [NSData dataWithContentsOfFile:path];
    //3.将二进制数据用系统NSXMLParser解析
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
    //4.设置代理
    parser.delegate = self;
    //5.开始解析
    [parser parse];

完成代理方法

//第一步，开始对document进行解析
- (void)parserDidStartDocument:(NSXMLParser *)parser{
    NSLog(@"文本解析");
}
//第二步，开始对节点解析
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
    NSLog(@"节点名%@",elementName);
    self.element = elementName;
}
//第三步,接收数据进行赋值
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    NSLog(@"正在赋值");
    NSLog(@"%@",string);
    if ([self.element isEqualToString:@"person"]) {
        self.person = [[Person alloc] init];
    }if ([self.element isEqualToString:@"name"] && self.person.name == nil) {
        self.person.name = string;
    }if ([self.element isEqualToString:@"sex"] && self.person.sex == nil) {
        self.person.sex = string;
    }if ([self.element isEqualToString:@"number"] && self.person.number == nil) {
        self.person.number = string;
    }if ([self.element isEqualToString:@"phone"] && self.person.phone == nil) {
        self.person.phone = string;
    }
}
//第四步，完成节点解析
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
    if ([elementName isEqualToString:@"person"]) {
        [self.dataArr addObject:self.person];
    }
    NSLog(@"完成节点的解析");
}
//第五步，完成文本解析
- (void)parserDidEndDocument:(NSXMLParser *)parser{
    NSLog(@"%ld",self.dataArr.count);
    
}