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1 前言
通过 nsjsonserialization 这个类的 datawithjsonobject:options:error:方法来实现,array 和 dictionary 序列化成 json 对象。方便在网络中传输。
2 代码实例
testdemo.m
[plain]
(void)conversetojson{
nsmutabledictionary *dictionary = [[nsmutabledictionary alloc] init];
[dictionary setvalue:@"archy" forkey:@"first name"];
[dictionary setvalue:@"robbins" forkey:@"last name"];
[dictionary setvalue:[nsnumber numberwithunsignedinteger:51] forkey:@"age"];
nsarray *arrayofarchyschildren = [[nsarray alloc] initwithobjects:
@"anthony's son 1",
@"anthony's daughter 1",
@"anthony's son 2",
@"anthony's son 3",
@"anthony's daughter 2", nil];
[dictionary setvalue:arrayofarchyschildren forkey:@"children"];
nserror *error = nil;
//nsjsonwritingprettyprinted:指定生成的json数据应使用空格旨在使输出更加可读。如果这个选项是没有设置,最紧凑的可能生成json表示。
nsdata *jsondata = [nsjsonserialization
datawithjsonobject:dictionary options:nsjsonwritingprettyprinted error:&error];
if ([jsondata length] > 0 && error == nil){
nslog(@"successfully serialized the dictionary into data.");
//nsdata转换为string
nsstring *jsonstring = [[nsstring alloc] initwithdata:jsondata encoding:nsutf8stringencoding];
nslog(@"json string = %@", jsonstring);
}
else if ([jsondata length] == 0 &&
error == nil){
nslog(@"no data was returned after serialization.");
}
else if (error != nil){
nslog(@"an error happened = %@", error);
}
}
-(void)conversetojson{
nsmutabledictionary *dictionary = [[nsmutabledictionary alloc] init];
[dictionary setvalue:@"archy" forkey:@"first name"];
[dictionary setvalue:@"robbins" forkey:@"last name"];
[dictionary setvalue:[nsnumber numberwithunsignedinteger:51] forkey:@"age"];
nsarray *arrayofarchyschildren = [[nsarray alloc] initwithobjects:
@"anthony's son 1",
@"anthony's daughter 1",
@"anthony's son 2",
@"anthony's son 3",
@"anthony's daughter 2", nil];
[dictionary setvalue:arrayofarchyschildren forkey:@"children"];
nserror *error = nil;
//nsjsonwritingprettyprinted:指定生成的json数据应使用空格旨在使输出更加可读。如果这个选项是没有设置,最紧凑的可能生成json表示。
nsdata *jsondata = [nsjsonserialization
datawithjsonobject:dictionary options:nsjsonwritingprettyprinted error:&error];
if ([jsondata length] > 0 && error == nil){
nslog(@"successfully serialized the dictionary into data.");
//nsdata转换为string
nsstring *jsonstring = [[nsstring alloc] initwithdata:jsondata encoding:nsutf8stringencoding];
nslog(@"json string = %@", jsonstring);
}
else if ([jsondata length] == 0 &&
error == nil){
nslog(@"no data was returned after serialization.");
}
else if (error != nil){
nslog(@"an error happened = %@", error);
}
}
控制台结果
2013-05-13 17:14:26.087 tojsontest[4890:303] successfully serialized the dictionary into data.
2013-05-13 17:14:26.089 tojsontest[4890:303] json string = {
"children" : [
"anthony's son 1",
"anthony's daughter 1",
"anthony's son 2",
"anthony's son 3",
"anthony's daughter 2"
],
"age" : 51,
"first name" : "archy",
"last name" : "robbins"
}
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