1 #import "ViewController.h"
2
3 @interface ViewController ()
4
5 @end
6
7 @implementation ViewController
8
9 -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
10 {
11 [self test];
12 }
13
14 -(void)jsonToOC
15 {
16 //1.确定url
17 NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=123&pwd=456&type=JSON"];
18
19 //2.创建请求对象
20 NSURLRequest *request = [NSURLRequest requestWithURL:url];
21
22 //3.发送异步请求
23 [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
24 //data---->本质上是一个json字符串
25 //4.解析数据
26 //NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
27
28 //JSON--->oc对象 反序列化
29 /*
30 第一个参数:JSON的二进制数据
31 第二个参数:
32 第三个参数:错误信息
33 */
34 /*
35 NSJSONReadingMutableContainers = (1UL << 0), 可变字典和数组
36 NSJSONReadingMutableLeaves = (1UL << 1), 内部所有的字符串都是可变的 ios7之后又问题 一般不用
37 NSJSONReadingAllowFragments = (1UL << 2) 既不是字典也不是数组,则必须使用该枚举值
38 */
39
40 NSString *strM = @"\"wendingding\"";
41
42 // NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
43
44 id obj = [NSJSONSerialization JSONObjectWithData:[strM dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingAllowFragments error:nil];
45
46 NSLog(@"%@---%@",[obj class],obj);
47
48 }];
49
50 }
51
52 //JSON--->OC
53 -(void)JSONWithOc
54 {
55 //NSString *strM = @"{\"error\":\"用户名不存在\"}";
56 //NSString *strM = @"[\"error\",\"用户名不存在\"]";
57 //NSString *strM = @"\"wendingding\"";
58 //NSString *strM = @"false";
59 //NSString *strM = @"true";
60 NSString *strM = @"null";
61
62 id obj = [NSJSONSerialization JSONObjectWithData:[strM dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingAllowFragments error:0];
63 NSLog(@"%@---%@",[obj class],obj);
64
65 /*
66 JOSN OC
67 {} @{}
68 [] @[]
69 "" @""
70 false NSNumber 0
71 true NSNumber 1
72 null NSNull为空
73 */
74
75 //nil
76 [NSNull null]; //该方法获得的是一个单粒,表示为空,可以用在字典或者是数组中
77
78 }
79
80 //OC--->json
81 -(void)OCtojson
82 {
83 NSDictionary *dictM = @{
84 @"name":@"dasheng11",
85 @"age":@3
86 };
87
88 NSArray *arrayM = @[@"123",@"456"];
89
90 //注意:并不是所有的OC对象都能转换为JSON
91 /*
92 - 最外层必须是 NSArray or NSDictionary
93 - 所有的元素必须是 NSString, NSNumber, NSArray, NSDictionary, or NSNull
94 - 字典中所有的key都必须是 NSStrings类型的
95 - NSNumbers不能死无穷大
96 */
97 NSString *strM = @"WENIDNGDING";
98
99 BOOL isValid = [NSJSONSerialization isValidJSONObject:strM];
100 if (!isValid) {
101 NSLog(@"%zd",isValid);
102 return;
103 }
104
105 //OC--->json
106 /*
107 第一个参数:要转换的OC对象
108 第二个参数:选项NSJSONWritingPrettyPrinted 排版 美观
109 */
110 NSData *data = [NSJSONSerialization dataWithJSONObject:strM options:NSJSONWritingPrettyPrinted error:nil];
111
112 NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
113 }
114
115 -(void)test
116 {
117 NSArray *arrayM = [NSArray arrayWithContentsOfFile:@"/Users/xiaomage/Desktop/课堂共享/11大神班上课资料/05-多线程网络/0225/资料/apps.plist"];
118 NSLog(@"%@",arrayM);
119
120 //[arrayM writeToFile:@"/Users/xiaomage/Desktop/123.json" atomically:YES];
121
122 //OC--->JSON
123 NSData *data = [NSJSONSerialization dataWithJSONObject:arrayM options:NSJSONWritingPrettyPrinted error:0];
124 [data writeToFile:@"/Users/xiaomage/Desktop/123.json" atomically:YES];
125 }
