iOS 数据解析(3)

原生网络数据解析:

1、第一种方法：

    NSURL *url =[NSURL URLWithString:@"http://www.weather.com.cn/data/cityinfo/101010100.html"];
    NSData *jsondata =[NSData dataWithContentsOfURL:url];
    id jsonObj = [NSJSONSerialization JSONObjectWithData:jsondata options:NSJSONReadingAllowFragments error:nil];
    NSDictionary *dic =(NSDictionary*)jsonObj;
    NSDictionary *dic1 =[dic objectForKey:@"weatherinfo"];
    NSLog(@"%@", [dic1 objectForKey:@"city"]);

2、第二种方法：

    NSURL *url =[NSURL URLWithString:@"http://www.weather.com.cn/data/cityinfo/101010100.html"];
    NSString *jsonStr =[NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
    NSData *jsondata =[jsonStr dataUsingEncoding:NSUTF8StringEncoding];
    id jsonObj = [NSJSONSerialization JSONObjectWithData:jsondata options:NSJSONReadingAllowFragments error:nil];
    NSDictionary *dic =(NSDictionary*)jsonObj;
    NSDictionary *dic1 =[dic objectForKey:@"weatherinfo"];
    NSLog(@"%@", [dic1 objectForKey:@"city"]);

3、第三种方法：

   NSURL *url =[NSURL URLWithString:@"http://www.weather.com.cn/data/cityinfo/101010100.html"];
    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url];
    //参数1：请求数据   参数2：请求之后返回的信息    参数3：错误信息
    NSData *jsondata = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];  //苹果已经放弃方法
    id jsonObj = [NSJSONSerialization JSONObjectWithData:jsondata options:NSJSONReadingAllowFragments error:nil];
    NSDictionary *dic =(NSDictionary*)jsonObj;
    NSDictionary *dic1 =[dic objectForKey:@"weatherinfo"];
    NSLog(@"%@", [dic1 objectForKey:@"city"]);

  最主要的是工程中别忘在plist文件中添加对http允许运行的代码

<key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>