【移動(dòng)應(yīng)用開(kāi)發(fā)技術(shù)】Json數(shù)據(jù)解析后分類思路

【移動(dòng)應(yīng)用開(kāi)發(fā)技術(shù)】Json數(shù)據(jù)解析后分類思路

Json數(shù)據(jù)解析后分類思路代碼下載地址：

"大字典2.zip"/s/HzjOj我們這里已從新浪微博中請(qǐng)求回來(lái)的數(shù)據(jù)作為例子。為了讓工程簡(jiǎn)化，我將數(shù)據(jù)寫入到本地了。這里主要是為了學(xué)習(xí)如何將Json數(shù)據(jù)解析分類。新浪微博請(qǐng)求返回來(lái)的數(shù)據(jù)大致格式如下：{

"statuses":[

{

"created_at":"TueMay3117:46:55+08002011",

"id":11488058246,

"text":"求關(guān)注。",

"source":"<ahref=""rel="nofollow">新浪微博</a>",

"favorited":false,

"truncated":false,

"in_reply_to_status_id":"",

"in_reply_to_user_id":"",

"in_reply_to_screen_name":"",

"geo":null,

"mid":"5612814510546515491",

"reposts_count":8,

"comments_count":9,

"annotations":[],

"user":{

"id":1404376560,

"screen_name":"zaku",

"name":"zaku",

"province":"11",

"city":"5",

"location":"北京朝陽(yáng)區(qū)",

"description":"人生五十年，乃如夢(mèng)如幻；有生斯有死，壯士復(fù)何憾。",

"url":"/zaku",

"profile_p_w_picpath_url":"/1404376560/50/0/1",

"domain":"zaku",

"gender":"m",

"followers_count":1204,

"friends_count":447,

"statuses_count":2908,

"favourites_count":0,

"created_at":"FriAug2800:00:00+08002009",

"following":false,

"allow_all_act_msg":false,

"remark":"",

"geo_enabled":true,

"verified":false,

"allow_all_comment":true,

"avatar_large":"/1404376560/180/0/1",

"verified_reason":"",

"follow_me":false,

"online_status":0,

"bi_followers_count":215

}

},

...

],

"previous_cursor":0,//暫未支持

"next_cursor":11488013766,//暫未支持

"total_number":81655

}以上的示例來(lái)自新浪微博官網(wǎng)。我標(biāo)出的紅色字體，是我們JSon解析分類的依據(jù)，他們都是字典，也就是說(shuō)JSon解析分類的思路是按照字典去新建類，類與類之間的嵌套關(guān)系和JSon數(shù)據(jù)的格式相同，這我JSon解析的方法。我來(lái)看一下代碼如何實(shí)現(xiàn)的：新建User類用來(lái)存放user字典中的內(nèi)容。.h文件如下：#import<Foundation/Foundation.h>

@interfaceUser:NSObject

@property(strong,nonatomic)NSString*screen_name;

-(User*)initWithJsonDictionary:(NSDictionary*)dic;

+(User*)UserWithJsonDictionary:(NSDictionary*)dic;

@end.m文件如下：@implementationUser

-(User*)initWithJsonDictionary:(NSDictionary*)dic

{

if(self=[superinit]){

self.screen_name=[dicobjectForKey:@"screen_name"];

}

returnself;

}

+(User*)UserWithJsonDictionary:(NSDictionary*)dic

{

//用這個(gè)類方法進(jìn)行初始化的時(shí)候，都會(huì)alloc一次，因此就會(huì)新分配一塊空間

return[[Useralloc]initWithJsonDictionary:dic];

}新建Status類用來(lái)存放statuses字典中的內(nèi)容。.h文件如下：#import<Foundation/Foundation.h>

#import"User.h"

@interfaceStatus:NSObject

@property(strong,nonatomic)NSString*userID;

//將多個(gè)字典嵌套的數(shù)據(jù)取出的思路是為每一個(gè)字典對(duì)應(yīng)的建一個(gè)數(shù)據(jù)模型的類

//例如：User類

@property(strong,nonatomic)User*user;

-(Status*)initWithJsonDictionary:(NSDictionary*)dic;

+(Status*)statusWithJsonDictionary:(NSDictionary*)dic;

@end.m文件如下：@implementationStatus

-(Status*)initWithJsonDictionary:(NSDictionary*)dic

{

if(self=[superinit]){

self.userID=[dicobjectForKey:@"idstr"];

NSDictionary*userDic=[dicobjectForKey:@"user"];

if(userDic){

self.user=[UserUserWithJsonDictionary:userDic];

}

}

returnself;

}

+(Status*)statusWithJsonDictionary:(NSDictionary*)dic

{

//用這個(gè)類方法進(jìn)行初始化的時(shí)候，都會(huì)alloc一次，因此就會(huì)新分配一塊空間

return[[Statusalloc]initWithJsonDictionary:dic];

}為了模擬在真實(shí)項(xiàng)目中，獲得數(shù)據(jù)的類和顯示數(shù)據(jù)的類不在一個(gè)類中我們新建一個(gè)試圖控制器用來(lái)顯示數(shù)據(jù)，我們顯示數(shù)據(jù)的位置是在控制臺(tái)。OtherViewController.h代碼如下：#import<UIKit/UIKit.h>

@interfaceOtherViewController:UIViewController

@property(strong,nonatomic)NSArray*statusArr;

@endOtherViewController.m代碼實(shí)現(xiàn)如下：//用來(lái)接收通過(guò)消息機(jī)制發(fā)送來(lái)的數(shù)據(jù)

-(void)getArray:(NSNotification*)aNotification

{

self.statusArr=aNotification.object;

}-(void)viewDidLoad

{

[superviewDidLoad];

//Doanyadditionalsetupafterloadingtheview.

//添加一個(gè)按鈕點(diǎn)擊顯示數(shù)據(jù)

UIButton*btn=[UIButtonbuttonWithType:UIButtonTypeRoundedRect];

btn.frame=CGRectMake(30,30,30,30);

[self.viewaddSubview:btn];

[btnaddTarget:selfaction:@selector(displayUserInfo)forControlEvents:UIControlEventTouchUpInside];

}-(void)displayUserInfo

{

Status*status=[self.statusArrobjectAtIndex:0];

NSLog(@"status.userID=%@",status.userID);

NSLog(@"status.user.screen_name=%@",status.user.screen_name);

}最后，我們來(lái)看一下最后的一個(gè)類，我們從這個(gè)類中獲取數(shù)據(jù)，獲取數(shù)據(jù)的本地文件在代碼例子中。ViewController.h代碼如下：#import<UIKit/UIKit.h>

@interfaceViewController:UIViewController

-(IBAction)changeVC:(id)sender;

@endViewController.m文件的代碼實(shí)現(xiàn)如下：需要在Xib中拖一個(gè)Button與下面的方法相關(guān)聯(lián)-(IBAction)changeVC:(id)sender

{

//將JSON格式的數(shù)據(jù)文件的路徑找出

NSString*path=[[NSBundlemainBundle]pathForResource:@"jsonTest"ofType:@"json"];

//將數(shù)據(jù)放入NSData中

NSData*data=[NSDatadataWithContentsOfFile:path];

//JSON解析

NSDictionary*dic=[NSJSONSerializationJSONObjectWithData:dataoptions:NSJSONReadingMutableLeaveserror:nil];

//NSLog(@"dic=%@",dic);

NSArray*arr=[dicobjectForKey:@"statuses"];

NSLog(@"%d",arr.count);

NSLog(@"arr=%@",arr);

//初始化一個(gè)數(shù)組

NSMutableArray*tempArr=[NSMutableArrayarray];

//將數(shù)組中的字典放入Status模型中，大家在這里會(huì)有一個(gè)疑問(wèn)將數(shù)組中的字典都放入模型中，怎么區(qū)分不同數(shù)組中的數(shù)據(jù)？

for(NSDictionary*iteminarr){

//答案在statusWithJsonDictionary:的類方法中見(jiàn)該方法注釋

Status*status=[StatusstatusWithJsonDictionar