iPhone开发之Json数据的解析

网络中数据的传输往往是以Json或XML格式进行的，如新浪微博、腾讯微博、人人网等。今天主要介绍一下ios下Json数据的解析。首先是使用TouchJson进行解析：TouchJson点击下载首先导入将Source文件加下的所以文件导入工程，在合适的位置添加CJSONDeserializer.h头文件。代码：

NSString *jsonStr = @"{"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"}]}";;
NSData *jsonData = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];
NSError *error;
NSMutableDictionary *root = [[CJSONDeserializer deserializer] deserialize:jsonData error:&error];
NSLog（@"Customers:%@", root）;
NSMutableArray *customers = [root objectForKey:@"customer"];
NSString *jsonTextStr = @"姓名: ";
for （NSMutableDictionary *customer in customers） {
NSString *name = [customer objectForKey:@"name"];
name = [name stringByAppendingString:@" "];
jsonTextStr = [jsonTextStr stringByAppendingString:name];
NSLog（@"customer:%@",[customer objectForKey:@"name"]）;
}

输出结果：

Customers:{
customer = （
{
name = roamer;
sumcount = "322.3";
ycount = "232.4";
},
{
name = "U738bU4e09";
sumcount = "1123.2";
ycount = "221.2";
},
{
name = "U674eU56db";
sumcount = "12123.2";
ycount = "1221.2";
}
）;
}
2012-06-15 14:08:20.406 TouchJsonTest[1495:f803] customer:roamer
2012-06-15 14:08:20.406 TouchJsonTest[1495:f803] customer:王三
2012-06-15 14:08:20.406 TouchJsonTest[1495:f803] customer:李四

下面使用SBJson SBJson下载
首先导入将Classes文件加下的所以文件导入工程，在合适的位置添加SBJson.h头文件。代码：

//解析数据
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSString *jsonStr = @"{"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"}]}";
NSError *error = nil;
NSMutableDictionary *root = [[NSMutableDictionary alloc] initWithDictionary:[parser objectWithString:jsonStr error:&error]];
//转换代码不然会带来中文问题，诸如加（）、：变成 = 等乱码问题
SBJsonWriter *jsonWrite = [[SBJsonWriter alloc] init];
NSString *jsonString = [jsonWrite stringWithObject:root];
NSLog（@"JsonString:%@", jsonString）;
[jsonWrite release];
NSMutableArray *customers = [root objectForKey:@"customer"];
NSLog（@"Customers:%@", customers）;
for （NSMutableDictionary *customer in customers） {
NSLog（@"Customer-name:%@", [customer objectForKey:@"name"]）;
}
[self.jsonData setText:@"解析完成"];
[self.parseBtn setTitle:@"Done" forState:UIControlStateNormal];

使用TouchJson和SBJson都可以快速的完成Json数据的解析，两者使用起来都比较简单，但TouchJson性能更好一些推荐使用。