IOS成长之路-JSON解析

json数据：

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{
"result": [
{
"meeting": {
"addr": "203",
"creator": "张一",
"member": [
{
"name": "张二",
"age": "20"
},
{
"name": "张三",
"age": "21"
},
{
"name": "张四",
"age": "22"
}
]
}
},

{
"meeting": {
"addr": "204",
"creator": "张二",
"member": [
{
"name": "张二",
"age": "20"
},
{
"name": "张三",
"age": "21"
},
{
"name": "张四",
"age": "22"
}
]
}
}
]
}

{
    "result": [
               {
               "meeting": {
               "addr": "203",
               "creator": "张一",
               "member": [
                          {
                          "name": "张二",
                          "age": "20"
                          },
                          {
                          "name": "张三",
                          "age": "21"
                          },
                          {
                          "name": "张四",
                          "age": "22"
                          }
                          ]
               }
               },
			   
               {
               "meeting": {
               "addr": "204",
               "creator": "张二",
               "member": [
                          {
                          "name": "张二",
                          "age": "20"
                          },
                          {
                          "name": "张三",
                          "age": "21"
                          },
                          {
                          "name": "张四",
                          "age": "22"
                          }
                          ]
               }
               }
               ]
}

1、获取json文件路径，根据路径来获取里面的数据：

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NSString *path=[[NSBundle mainBundle] pathForResource:@"test" ofType:@"json"];
NSString *_jsonContent=[[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

NSString *path=[[NSBundle mainBundle] pathForResource:@"test" ofType:@"json"];
    NSString *_jsonContent=[[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

2、然后根据得到的_jsonContent字符串对象来获取里面的键值对：

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NSMutableDictionary dict=[_jsonContent JSONValue];//我们不需要去定义获取的方法，使用系统定义好的JSONValue即可

NSMutableDictionary dict=[_jsonContent JSONValue];//我们不需要去定义获取的方法，使用系统定义好的JSONValue即可

3、然后根据得到的键值对来进行JSON解析：

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/*
根据上面json数据之间的逻辑关系，可以获知我们解析的顺序：
1. 根据得到的字符串获取里面的键值对，
2. 根据得到的键值对通过key来得到对应的值，也就是值里面的数组，
3. 然后获取数组中的键值对，
4. 然后根据得到的键值对通过key获取里面的键值对中的值
*/
//json解析
//2.
NSArray *result=[_dict objectForKey:@"result"];
//3.
NSDictionary *dic=[result objectAtIndex:0];
//4.
NSDictionary *meeting=[dic
objectForKey:@"meeting"];

//得到 addr 值
NSString *address = [meeting objectForKey:@"addr"];
//得到 creator 值
NSString *creator = [meeting objectForKey:@"creator"];
//得到 member 里面的数据，因为这个键值中有数组，所以要重复上面的2，3，4的动作

//2.
NSArray *members=[meeting objectForKey:@"member"];
//3.
//这里用了for循环语句，
for (NSDictionary * member in members) {
//4.
NSString *name = [member objectForKey:@"name"];
NSString *age = [member objectForKey:@"age"];
}

/*
         根据上面json数据之间的逻辑关系，可以获知我们解析的顺序：
           1. 根据得到的字符串获取里面的键值对，
             2.   根据得到的键值对通过key来得到对应的值，也就是值里面的数组，
               3.     然后获取数组中的键值对，
                 4.       然后根据得到的键值对通过key获取里面的键值对中的值
         */
       //json解析
        //2.
        NSArray *result=[_dict objectForKey:@"result"];
        //3.
        NSDictionary *dic=[result objectAtIndex:0];
        //4.
        NSDictionary *meeting=[dic
                               objectForKey:@"meeting"];
        
        //得到 addr 值
        NSString *address = [meeting objectForKey:@"addr"];
        //得到 creator 值
        NSString *creator = [meeting objectForKey:@"creator"];
        //得到 member 里面的数据，因为这个键值中有数组，所以要重复上面的2，3，4的动作
        //2.
        NSArray *members=[meeting objectForKey:@"member"];
        //3.
        //这里用了for循环语句，
        for (NSDictionary * member in members) {
            //4.
            NSString *name = [member objectForKey:@"name"];
            NSString *age = [member objectForKey:@"age"];
        }

这样就可以实现解析json数据了。。。