ios 使用json

浏览数：22 / 时间：2015年06月11日

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。
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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

[cpp] view plain copy

//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

[cpp] view plain copy

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); http://www.huiyi8.com/moban/?
for(NSMutableDictionary * member in customers)
{
NSLog(@"%@",[[member objectForKey:@"name"] description]);
}

6、递归遍历解析出的NSDictionary对象

[cpp] view plain copy

-(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
[cpp] view plain copy网站模板

NSString * jsonStr=[items JSONRepresentation];