json解析的四种方法

参考：http://blog.csdn.net/enuola/article/details/7903632

JSON解析主要有四种方法:TouchJson、SBJson、JSONKit和iOS原生的方法

touchJson下载包：

SBJson下载包：https://github.com/stig/json-framework

JSONKit下载包：https://github.com/johnezang/JSONKit

TouchJson解析

导入#import "TouchJson/JSON/CJSONDeserializer.h"

NSURL *url = [NSURL URLWithString:@""];

NSError *error;

NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];

NSLog(@"jsonString-->%@",jsonString);

NSDictionary *rootDic =[ [CJSONDeserializer deserializer]deserialize:[jsonString dataUsingEncoding:NSUTF8StringEncoding] error:&error];

SBJson解析

导入#import "SBJson/SBJson.h

NSURL *url = [NSURL URLWithString:@""];

NSError *error = nil;

NSString *jsonString = [NSString stringWithContentOfURL:url encoding:NSUTF8StringEncoding error:&error];

SBJsonParser *parser = [[SBJsonParser alloc] init];

NSDictionary *rootDic = [parser objectWithString:jsonString error:&error];

JSONKit解析

导入#import "JSONKit/JSONKit.h"

如果json是单层的，即value是字符、数字，可以用objectFromJSONString

NSString *json = @"{\"a\":123,\"b\":\"abc\"}";

NSDictionary *data = [json objectFromJSONString];

如果json有嵌套，即value里有array、object，如果再用objectFromJSONString，程序可能报错，最好使用objectFromJSONStringWithParseOptions：

NSString *json2 = @"{\"a\":123, \"b\":\"abc\", \"c\":[456, \"hello\"], \"d\":{\"name\":\"张三\", \"age\":\"32\"}}";

NSDictionary *data2 = [json2 objectFromJSONStringWithParseOptions:JKParseOptionLooseUnicode];

iOS自带解析类

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@""]];

NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:bill error:nil];

NSDictionary *weatherDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];