json解析数据 再讲数据转化成json

//系统解析

/*

 NSJSONReadingMutableContainers = (1UL << 0), //可以返回可变的数组和词典

 NSJSONReadingMutableLeaves = (1UL << 1),//返回可变的数据内容

 NSJSONReadingAllowFragments = (1UL << 2)//返回不可变的

 1、data  要解析的数据

 2、options 解析数据返回值类型

 3、error  错误信息

 */

 //获取要解析的文件路径

    NSString *path = [[NSBundlemainBundle]pathForResource:@"Students"ofType:@"txt"];

    NSData *data = [NSDatadataWithContentsOfFile:path];

    //解析数据

   NSArray * arr = [NSJSONSerializationJSONObjectWithData:data options:NSJSONReadingMutableContainerserror:nil];

    NSLog(@"%@",arr);

    //把oc的数组 或者词典转化为 json

    NSArray *jsonArray =@[@{@"name":@"jack1"},@{@"name":@"jack2"},@{@"name":@"jack3"}];

    NSData *data2 = [NSJSONSerializationdataWithJSONObject:jsonArray options:NSJSONWritingPrettyPrintederror:nil];

    NSString *string = [[NSStringalloc]initWithData:data2encoding:NSUTF8StringEncoding];

    NSLog(@"%@",string);

    2.

NSString *path = [[NSBundlemainBundle]pathForResource:@"Students"ofType:@"txt"];

    NSData *data = [NSDatadataWithContentsOfFile:path];

    NSArray * arr = [dataobjectFromJSONData];

    NSLog(@"arr ==%@",arr);

    // //把oc的数组 或者词典转化为 json

    NSArray *jsonarray =@[@{@"name":@"jack1"},@{@"name":@"jack2"},@{@"name":@"jack3"}];

    NSString *string = [jsonarrayJSONString];

    NSLog(@"%@",string);