Unity3D LitJSON 插件使用教程

安装LitJSON

将LitJSON编译好的dll文件通过Import New Asset的方式导入到项目中，再使用Using LitJSON即可使用JSONMapper类中的简便方法。dll的下载地址:--pan.baidu.com///s///1bnrpVJp

将JSON转化为Object并可逆向转化

为了在.Net程序中使用JSON格式的数据。一个自然的方法是使用JSON文本生成一个特定的类的一个新实例；为了匹配类的格式，一般存储的JSON字符串是一个字典。

另一方面，为了将对象序列化为JSON字符串，一个简单的导出操作，听起来是个好主意。

为了这个目的，LitJSON包引入了JsonMapper类，它提供了两个用于做到 JSON转化为object 和 object转化为JSON 的主要方法。这两个方法是jsonmapper.toobject和jsonmapper.tojson。

将object转化为字符串之后，我们就可以将这个字符串很方便地在文件中读取和写入了。

一个简单的JsonMapper的例子

在下面的例子中，ToObject方法有一个泛型参数，来指定返回的某种特定的数据类型：即JsonMapper.ToObject<T>。

view
sourceprint?

01.

using
LitJson;

02.

using
System;

03.

04.

public

class

Person

05.

{

06.

//
C# 3.0 auto-implemented properties

07.

public

string
Name     { get; set; }

08.

public

int

Age
{ get; set; }

09.

public

DateTime
Birthday { get; set; }

10.

}

11.

12.

public

class

JsonSample

13.

{

14.

public

static

void

Main()

15.

{

16.

PersonToJson();

17.

JsonToPerson();

18.

}

19.

20.

public

static

void

PersonToJson()

21.

{

22.

Person
bill =

new

Person();

23.

24.

bill.Name
=

"William
Shakespeare"

;

25.

bill.Age
=

51

;

26.

bill.Birthday
=

new

DateTime(

1564

,

4

,

26

);

27.

28.

string
json_bill = JsonMapper.ToJson(bill);

29.

30.

Console.WriteLine(json_bill);

31.

}

32.

33.

public

static

void

JsonToPerson()

34.

{

35.

string
json = @"

36.

{

37.

""

Name

""

:

""

Thomas
More

""

,

38.

""

Age

""

:

57

,

39.

""

Birthday

""

:

""

02

/

07

/

1478

00

:

00

:

00

""

40.

}";

41.

42.

Person
thomas = JsonMapper.ToObject<Person>(json);

43.

44.

Console.WriteLine(

"Thomas'
age:{0}"

,thomas.Age);

45.

}

46.

}

上文的输出：

view
sourceprint?

1.

{

"Name"

:

"William
Shakespeare"

,

"Age"

:

51

,

"Birthday"

:

"04/26/1564
00:00:00"

}

2.

Thomas'
age:

57

使用非泛型的JsonMapper.ToObject

当不存在特定的JSON数据类时，它将返回一个JSONData实例。JSONData是一种通用型可以保存任何数据类型支持JSON，包括list和dictionary。

view
sourceprint?

01.

using
LitJson;

02.

using
System;

03.

04.

public

class

JsonSample

05.

{

06.

public

static

void

Main()

07.

{

08.

string
json = @"

09.

{

10.

""

album

""

:
{

11.

""

name

""

:

""

The
Dark Side of the Moon

""

,

12.

""

artist

""

:

""

Pink
Floyd

""

,

13.

""

year

""

:

1973

,

14.

""

tracks

""

:
[

15.

""

Speak
To Me

""

,

16.

""

Breathe

""

,

17.

""

On
The Run

""

18.

]

19.

}

20.

}

21.

";

22.

23.

LoadAlbumData(json);

24.

}

25.

26.

public

static

void

LoadAlbumData(string
json_text)

27.

{

28.

Console.WriteLine(

"Reading
data from the following JSON string:{0}"

,

29.

json_text);

30.

31.

JsonData
data = JsonMapper.ToObject(json_text);

32.

33.

//
Dictionaries are accessed like a hash-table

34.

Console.WriteLine(

"Album's
name:{0}"

,data[

"album"

][

"name"

]);

35.

36.

//
Scalar elements stored in a JsonData instance can be cast to

37.

//
their natural types

38.

string
artist = (string) data[

"album"

][

"artist"

];

39.

int

year
= (

int

)
data[

"album"

][

"year"

];

40.

41.

Console.WriteLine(

"Recorded
by {0} in {1}"

,artist,
year);

42.

43.

//
Arrays are accessed like regular lists as well

44.

Console.WriteLine(

"First
track:{0}"

,data[

"album"

][

"tracks"

][

0

]);

45.

}

46.

}

上面例子的输出：

view
sourceprint?

01.

Reading
data from the following JSON string:

02.

{

03.

"album"

:
{

04.

"name"

:

"The
Dark Side of the Moon"

,

05.

"artist"

:

"Pink
Floyd"

,

06.

"year"

:

1973

,

07.

"tracks"

:
[

08.

"Speak
To Me"

,

09.

"Breathe"

,

10.

"On
The Run"

11.

]

12.

}

13.

}

14.

15.

Album's
name:The Dark Side of the Moon

16.

Recorded
by Pink Floyd in

1973

17.

First
track:Speak To Me

Reader和Writer

一些人喜欢使用stream的方式处理JSON数据，对于他们， 我们提供的接口是jsonreader和jsonwriter。

JSONMapper实际上是建立在以上两个类的基础上的，所以你可以把这两个类当成是litJSON的底层接口。

使用JsonReader

view
sourceprint?

01.

using
LitJson;

02.

using
System;

03.

04.

public

class

DataReader

05.

{

06.

public

static

void

Main()

07.

{

08.

string
sample = @"{

09.

""

name

""

:

""

Bill

""

,

10.

""

age

""

:

32

,

11.

""

awake

""

:

true

,

12.

""

n

""

:

1994.0226

,

13.

""

note

""

:
[ 

""

life

""

,

""

is

""

,

""

but

""

,

""

a

""

,

""

dream

""

]

14.

}";

15.

16.

PrintJson(sample);

17.

}

18.

19.

public

static

void

PrintJson(string
json)

20.

{

21.

JsonReader
reader =

new

JsonReader(json);

22.

23.

Console.WriteLine
(

"{0,14}
{1,10} {2,16}"

,

"Token"

,

"Value"

,

"Type"

);

24.

Console.WriteLine
(

new

String
(

'-'

,

42

));

25.

26.

//
The Read() method returns false when there's nothing else to read

27.

while

(reader.Read())
{

28.

string
type = reader.Value !=

null

?

29.

reader.Value.GetType().ToString()
:

""

;

30.

31.

Console.WriteLine(

"{0,14}
{1,10} {2,16}"

,

32.

reader.Token,
reader.Value,type);

33.

}

34.

}

35.

}

输出如下：

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sourceprint?

01.

Token
Value             Type

02.

------------------------------------------

03.

ObjectStart

04.

PropertyName
name    System.String

05.

String
Bill    System.String

06.

PropertyName
age    System.String

07.

Int

32

System.Int32

08.

PropertyName
awake    System.String

09.

Boolean
True   System.Boolean

10.

PropertyName
n    System.String

11.

Double

1994.0226

System.Double

12.

PropertyName
note    System.String

13.

ArrayStart

14.

String
life    System.String

15.

String
is    System.String

16.

String
but    System.String

17.

String
a    System.String

18.

String
dream    System.String

19.

ArrayEnd

20.

ObjectEnd