IOS中使用json

来源：互联网发布：手机陀螺仪校准软件编辑：程序博客网时间：2024/06/12 13:13

1、从https://github.com/stig/json-framework/中下载json框架：json-framework

2、解压下载的包，将class文件夹下的所有文件导入到当前工程下。

3、在使用的文件中加入导入语句：#import "SBJson.h"

4、将json字符串转为NSDictionary对象

//测试json的解析-(void)testJsonParser: (NSString *) jsonString{    jsonString = [[NSString alloc] initWithString:@"{\"userInfo\":{\"userName\":\"张三\",\"sex\":\"男\"}}"];    NSLog(@"正在解析json字符串是：%@",jsonString);        SBJsonParser * parser = [[SBJsonParser alloc] init];    NSError * error = nil;    NSMutableDictionary *jsonDic = [parser objectWithString:jsonString error:&error];    NSMutableDictionary * dicUserInfo = [jsonDic objectForKey:@"userInfo"];        NSLog(@"%@",[jsonDic objectForKey:@"userInfo" ]);    NSLog(@"%@",[dicUserInfo objectForKey:@"userName"]);    NSLog(@"%@",[dicUserInfo objectForKey:@"sex"]);}

5、处理json对象有多个记录的方法

        NSString * customerGridJsonString = [[NSString alloc]initWithString:@"{\"customer\":[{\"name\":\"roamer\",\"ycount\":\"232.4\",\"sumcount\":\"322.3\"},{\"name\":\"王三\",\"ycount\":\"221.2\",\"sumcount\":\"1123.2\"},{\"name\":\"李四\",\"ycount\":\"1221.2\",\"sumcount\":\"12123.2\"}]}"];                SBJsonParser * parser = [[SBJsonParser alloc] init];//        NSLog(@"%@",customerGridJsonString);        NSError * error = nil;                NSMutableDictionary *root = [[NSMutableDictionary alloc] initWithDictionary:[parser objectWithString:customerGridJsonString error:&error]];        NSLog(@"%@",root);        //注意转换代码        SBJsonWriter *jsonWriter = [[SBJsonWriter alloc] init];                NSString *jsonString = [jsonWriter stringWithObject:root];                [jsonWriter release];        NSLog(@"%@",jsonString);        //注意转换代码        NSMutableArray * customers = [root objectForKey:@"customer"];        NSLog(@"%@",customers);        for(NSMutableDictionary * member  in customers)        {            NSLog(@"%@",[[member objectForKey:@"name"] description]);        }

6、递归遍历解析出的NSDictionary对象

-(void)visitDict:(NSDictionary *)dict{    NSArray *keys=[dict allKeys];    for (NSString *key in keys) {       NSString *result=[NSString stringWithFormat:@"key=%@,value=%@",key,[dict objectForKey:key]];       NSLog(result);       if([[dict objectForKey:key] isKindOfClass:[NSDictionary class]]){              [self visitDict:[dict objectForKey:key]];       }     }  }

7、将解析出的NSDictionary对象还原为json字符串

NSString * jsonStr=[items JSONRepresentation];