网络之Json生成解析

//
//  ViewController.m
//  Json
//
//  Created by City--Online on 15/4/28.
//  Copyright (c) 2015年 CYW. All rights reserved.
//
#define strUrl @"http://app.api.autohome.com.cn/autov3.2/news/newslist-a2-pm1-v3.2.0-c0-nt0-p1-s20-l0.html"
#import "ViewController.h"
#import "SBJson.h"
#import "CJSONDeserializer.h"
#import "CJSONSerializer.h"
#import "JSONKit.h"


@interface ViewController ()
@property(nonatomic,strong)NSString *stringData;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
//    json解析
    NSURL *url=[NSURL URLWithString:strUrl];
    NSError *err=NULL;
    //获取Json字符串
    NSString *Jsonstr=[NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&err];
    NSData *data=[Jsonstr dataUsingEncoding:NSUTF8StringEncoding];
    
//    第一种:IOS5以上自带的JSONObjectWithData
    
//    typedef NS_OPTIONS(NSUInteger, NSJSONReadingOptions) {
//        NSJSONReadingMutableContainers = (1UL << 0),//返回可变容器，NSMutableDictionary或NSMutableArray
//        NSJSONReadingMutableLeaves = (1UL << 1),//返回的JSON对象中字符串的值为NSMutableString
//        NSJSONReadingAllowFragments = (1UL << 2)//允许JSON字符串最外层既不是NSArray也不是NSDictionary，但必须是有效的JSON Fragment。例如使用这个选项可以解析 @“123” 这样的字符串。
//    }
    
    //解析
    NSDictionary *dic=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&err];
    if (err==nil) {
        NSLog(@"%@",[dic objectForKey:@"message"]);
        NSArray *array=[[dic objectForKey:@"result"] objectForKey:@"focusimg"];
        NSLog(@"%@",[array objectAtIndex:1]);
       
    }
    //生成
    //判断是否能转为Json
    if ([NSJSONSerialization isValidJSONObject:dic]) {
        //转为Json
        NSData *data= [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];
        NSString *str=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
        NSLog(@"%@",str);
        //json再次转为字典
         NSDictionary *dic=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&err];
        NSLog(@"%@",dic);
        
    }
    
    
//    第二种:SBJson
//      解析
    //引入#import "SBJson.h"
    SBJsonParser *parser=[[SBJsonParser alloc]init];
    NSDictionary *SBJsonDic=[parser objectWithString:Jsonstr error:nil];
    NSLog(@"%@",SBJsonDic);
    
    SBJsonWriter  *sbwriter=[[SBJsonWriter alloc]init];
    NSString *sbstr=[sbwriter stringWithObject:SBJsonDic];
    NSLog(@"%@",sbstr);
    
    
    
//    第三种:Touch Json
//    解析
//    #import "TouchJson/JSON/CJSONDeserializer.h"
    NSDictionary *touchDic=[[CJSONDeserializer deserializer] deserialize:data error:nil];
    NSLog(@"%@",touchDic);
//    生成
    NSString *touchstr=[[NSString alloc]initWithData: [[CJSONSerializer serializer] serializeDictionary:touchDic error:nil] encoding:NSUTF8StringEncoding];
    NSLog(@"%@",touchstr);
    
    
    
    
//    第四种:JsonKit
//    使用Jsonkit时引入第三方稍微麻烦
//    第一步:引入Jsonkit
//    第二步:JsonKit支持MRC，不支持ARC(伟哥指导纠正thanks)。点击Targets->Build Phases->Compile Sources中找到JsonKit.m点击输入-fno-objc-arc
//    第三步:在Build Setting中Levels中搜索 Direct usage of ‘isa‘设置为NO
    //生成
    NSDictionary *JsonKitDic=[Jsonstr objectFromJSONString];
    NSLog(@"%@",JsonKitDic);
    //解析
    NSString *JsonKitstr=[JsonKitDic JSONString];
    NSLog(@"%@",JsonKitstr);
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end