XML JSON解析--基本功能

一,json的解析

json文件:

{"code": "cn","cities":
[{"name": "保定", "lat": 38849998, "lon": 115569999},
{"name": "驻马店", "lat": 33000000, "lon": 114019996}]
}

定义一个可变数组存放每条数据

@property (nonatomic ,strong) NSMutableArray *cityList;

self.cityList = [NSMutableArray array];//首先别忘了初始化

NSString *paths=[[NSBundle mainBundle]resourcePath];//获取文件所在的文件夹路径
NSString *path=[paths stringByAppendingPathComponent:@"citys.txt"];//获取文件全路径
NSData *data=[NSData dataWithContentsOfFile:path];//读取文件到data

//将data数据转化成 json格式的数据到字典中
NSDictionary *parser=[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

将字典存入数组: [self.cityList addObjectsFromArray:[parser objectForKey:@"cities"]];

最后读取:

NSDictionary *dic = self.cityList[indexPath.row];
NSString *name= [dic objectForKey:@"name"];
NSString *latitude=[dic objectForKey:@"lat"];
NSString *longitude=[dic objectForKey:@"lon"];

2,XML的解析,基本和json的解析一样

xml文件内容格式:

<?xml version="1.0"?>
<xml_api_reply version="1">
<cities>
<city>
<name data="保定"/>
<latitude_e6 data="38849998"/>
<longitude_e6 data="115569999"/>
</city>
<city default="true" >
<name data="北京"/>
<latitude_e6 data="39930000"/>
<longitude_e6 data="116279998"/>
</city>
</cities>
</xml_api_reply>

如json一样的步骤:

self.cityList=[[NSMutableArray alloc]init];//定义数组存放字典:name,latitude_e6,longitude_e6

NSString *paths=[[NSBundle mainBundle]resourcePath];
NSString *path=[paths stringByAppendingPathComponent:@"citys.xml"];
//从路径获取文件内容
NSData *data=[NSData dataWithContentsOfFile:path];
GDataXMLDocument *doc=[[GDataXMLDocument alloc]initWithData:data options:0 error:Nil];
//得到根节点
GDataXMLElement *root=doc.rootElement;
GDataXMLElement *secondLevalRoot=[[root elementsForName:@"cities"]lastObject];
NSArray *cities=[secondLevalRoot elementsForName:@"city"];
for (GDataXMLElement * item in cities) {
NSMutableDictionary *dic = [NSMutableDictionary dictionary];

for (GDataXMLElement *detail in item.children) {
[dic setObject:[detail attributeForName:@"data"].stringValue forKey:detail.name];
}
[self.cityList addObject:dic];
}

最后读取:

NSDictionary *dic = self.cityList[indexPath.row];
NSString *name= [dic objectForKey:@"name"];
NSString *latitude=[dic objectForKey:@"latitude_e6"];
NSString *longitude=[dic objectForKey:@"longitude_e6"];

三,对网络数据进行读取

-(void)didClickParse:(id)sender
{
NSString *urlstring=@"http://124.205.147.26/student/class_12/team_learn/lichanghong.php";
NSURL *url=[NSURL URLWithString:urlstring];//此处网络地址可以换成超链接
NSURLRequest *request=[NSURLRequest requestWithURL:url];
NSData *data=[NSURLConnection sendSynchronousRequest:request returningResponse:Nil error:Nil];
//NSString *content=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
//NSLog(@"%@",content);

//解析
NSArray *parser=[NSJSONSerialization JSONObjectWithData:data options:0 error:Nil];
NSLog(@"%@",parser);

}

四,对字符串进行解析

首先需要引入协议NSXMLParserDelegate

-(void)didClickParser:(id)sender
{
NSLog(@"%@",[NSDate date].description);
NSString *xml=@"<root> <image>http://www,baidu.com/1.jpg</image> <image>http://www,baidu.com/2.jpg</image> <image>http://www,baidu.com/3.jpg</image> </root>";
//NSXMLParser对象进行解析xml结构的字符串
//dataUsingEncoding使用一种编码方式将字符串转换成二进制数据data对象

NSXMLParser *parser=[[NSXMLParser alloc]initWithData:[xml dataUsingEncoding:NSUTF8StringEncoding]];
//NSXMLParser的解析方式得到的返回结果是通过代理对象返回的
NSLog(@"%@",parser);
parser.delegate=self;

[parser parse];

}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
NSLog(@"%@",string);
}