MiniJson在unity上还是挺可以的，不过它生成的对象是Dictionary<string,object>和List<object>（旧版本生成Hashtable和ArrayList），对于C#这种强类型来说，使用还是不太方便，因此做了一个封装可以直接生成指定对象或对象数组。需要注意到的是，对于对象中的数组字段，只支持原始数组，不支持ArrayList和List等。同时，object[]类型的数组，因为它可以容纳任意类型，而在json中并未记录数组元素具体是何种类型，因此，复杂元素会直接以Dictionary<string,object>或List<object>的形式写入object[]中。
下面是扩展类：
namespace ND.CS.Json
{
using System.Collections;
using System.Collections.Generic;
using System;
using System.Reflection;
using Internal;
/// <summary>
/// 重命名key和标记能否为Null
/// </summary>
public class JRAttribute : Attribute
{
public string Key;
public bool Nullable;
}
/// <summary>
/// MiniJson的面向对象扩展
/// </summary>
public class UJson
{
public static string ToJson(object obj)
{
return Json.Serialize(ObjectSerialize(obj));
}
public static string ToJson<T>(T[] array)
{
var list = new List<object>(array.Length);
foreach (var i in array)
{
list.Add(i);
}
return Json.Serialize(ArraySerialize(list));
}
public static T ToObject<T>(string j) where T:class, new()
{
var dict = Json.Deserialize(j) as Dictionary<string, object>;
return ObjectDeserialize(typeof(T),dict) as T;
}
public static T[] ToObjectArray<T>(string j)
{
var jlist = Json.Deserialize(j) as List<object>;
var list = (ArrayDeserialize(typeof(T),jlist) as IList);
var array = new T[list.Count];
for (int i = 0; i < list.Count; i++)
{
array[i] = (T)list[i];
}
return array;
}
/// <summary>
/// minijson原始方法
/// </summary>
/// <param name="json"></param>
/// <returns></returns>
public static object Deserialize(string json)
{
return Json.Deserialize(json);
}
/// <summary>
/// minijson原始方法
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static string Serialize(object obj)
{
return Json.Serialize(obj);
}
private static Type TJObj = typeof(Dictionary<string, object>);
private static Type TJArray = typeof(List<object>);
private static bool IsStr(object obj)
{
return obj is string;
}
private static bool IsNum(object obj) {
if (obj!=null)
{
return obj is int
|| obj is uint
|| obj is long
|| obj is sbyte
|| obj is byte
|| obj is short
|| obj is ushort
|| obj is ulong
|| obj is float
|| obj is double;
}
return false;
}
private static bool IsSimpleType(object obj)
{
return IsStr(obj) || IsNum(obj) || obj is bool;
}
private static bool IsJObject(object obj) {
if (obj != null)
{
var t = obj.GetType();
return t == TJObj;
}
return false;
}
private static bool IsJArray(object obj) {
if (obj != null)
{
var t = obj.GetType();
return t == TJArray;
}
return false;
}
public static Dictionary<string,object> ObjectSerialize(object obj)
{
if (obj == null)
return null;
var dict = new Dictionary<string, object>();
var fields = obj.GetType().GetFields();
foreach (FieldInfo i in fields)
{
var attrs = i.GetCustomAttributes(typeof(JRAttribute), true);
var f = i.GetValue(obj);
string key = i.Name;
if (attrs != null && attrs.Length > 0)
key = ((JRAttribute)attrs[0]).Key;
if (IsSimpleType(f))
{
dict.Add(key, i.GetValue(obj));
}
else if (f is IList)
{
dict.Add(key, ArraySerialize(i.GetValue(obj)));
}
else
{
dict.Add(key, ObjectSerialize(i.GetValue(obj)));
}
}
return dict;
}
public static List<object> ArraySerialize(object obj)
{
var list = obj as IList;
var array = new List<object>();
foreach (object i in list)
{
if(IsSimpleType(i))
{
array.Add(i);
}
else if (i is IList)
{
array.Add(ArraySerialize(i));
}
else
{
array.Add(ObjectSerialize(i));
}
}
return array;
}
public static object ObjectDeserialize(Type t,Dictionary<string, object> dict)
{
if (dict == null)
{
return null;
}
var ctor = t.GetConstructor(
BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
null,
Type.EmptyTypes,
null);
var obj = ctor.Invoke(null);
var fields = obj.GetType().GetFields();
foreach (FieldInfo i in fields) {
var attrs = i.GetCustomAttributes(typeof(JRAttribute), true);
string key = i.Name;
bool nullable = false;
if (attrs != null && attrs.Length > 0)
{
key = ((JRAttribute)attrs[0]).Key;
nullable = ((JRAttribute)attrs[0]).Nullable;
}
var val = GetDictValue(dict, key,nullable);
if (SetSimpleType(obj,i, val))
{
}
else if (i.FieldType.BaseType == typeof(Array))
{
i.SetValue(obj, ArrayDeserialize(i.FieldType.GetElementType(), val as List<object>));
}
else
{
i.SetValue(obj, ObjectDeserialize(i.FieldType, val as Dictionary<string, object>));
}
}
return obj;
}
/// <summary>
/// object集合元素为多种类型时，转到Json丢失元素类型信息，因此对复合元素处理为List<object>和Dictionary<string, object>
/// </summary>
/// <param name="tUnit"></param>
/// <param name="list"></param>
/// <returns></returns>
public static object ArrayDeserialize(Type tUnit, IList list)
{
if (list == null)
{
return null;
}
var obj = Array.CreateInstance(tUnit, list.Count);
bool isObjectArray = tUnit == typeof(object);
int idx = 0;
foreach (object i in list)
{
if (i == null)
{
obj.SetValue(i, idx);
}
else if (IsSimpleType(i))
{
if (i.GetType() == tUnit || isObjectArray)
obj.SetValue(i, idx);
else
throw new InvalidCastException(string.Format("{0}不适用于{1}数组", i.GetType(), tUnit));
}
else if (i is IList)
{
if (i.GetType()==tUnit)
obj.SetValue(ArrayDeserialize(tUnit,i as List<object>),idx);
else if (isObjectArray)
obj.SetValue(i as List<object>,idx);
else
throw new InvalidCastException(string.Format("{0}不适用于{1}数组", i.GetType(), tUnit));
}
else
{
if (isObjectArray)
obj.SetValue(i as Dictionary<string, object>,idx);
else
obj.SetValue(ObjectDeserialize(tUnit, i as Dictionary<string, object>), idx);
}
idx++;
}
return obj;
}
private static long LongNum(object num) {
if (num == null)
{
return 0;
}
Int64 v = (Int64)num;
return v;
}
private static double DoubleNum(object num)
{
if (num == null)
{
return 0;
}
double v = (double)num;
return v;
}
private static bool IsLongNum(object i)
{
if (i == null)
{
return false;
}
return i is int
|| i is uint
|| i is long
|| i is sbyte
|| i is byte
|| i is short
|| i is ushort
|| i is ulong;
}
private static bool SetSimpleType(object inst,FieldInfo field,object val)
{
bool ret = true;
var f = field.GetValue(inst);
object val2 = null;
if (val == null)
val = 0;
else
val2 = val;
if (f is double || f is long || f is ulong)
{
field.SetValue(inst,val);
}
else if (f is float)
{
var v = (double)val;
field.SetValue(inst, (float)v);
}
else if (f is decimal)
{
var v = (double)val;
field.SetValue(inst, (decimal)v);
}
else if (f is int || f is uint)
{
var v = (long)val;
field.SetValue(inst, (int)v);
}
else if (f is short || f is ushort)
{
var v = (long)val;
field.SetValue(inst, (short)v);
}
else if (f is byte || f is sbyte)
{
var v = (long)val;
field.SetValue(inst, (byte)v);
}
else if(field.FieldType == typeof(string))
{
field.SetValue(inst, val2);
}
else if (field.FieldType == typeof(bool))
{
if (val2 == null)
val2 = false;
field.SetValue(inst, val2);
}
else
{
ret = false;
}
return ret;
}
private static object GetDictValue(Dictionary<string,object> dict,string key,bool nullable)
{
try
{
return dict[key];
}
catch (Exception)
{
if (nullable)
{
return null;
}
throw new Exception("不存在key:"+key);
}
}
}
}当然，需要配合MiniJson使用，我把MiniJson放在一个命名空间中了以免冲突：
/*
* Copyright (c) 2013 Calvin Rien
*
* Based on the JSON parser by Patrick van Bergen
* http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
*
* Simplified it so that it doesn't throw exceptions
* and can be used in Unity iPhone with maximum code stripping.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
namespace ND.CS.Internal
{
// Example usage:
//
// using UnityEngine;
// using System.Collections;
// using System.Collections.Generic;
// using MiniJSON;
//
// public class MiniJSONTest : MonoBehaviour {
// void Start () {
// var jsonString = "{ \"array\": [1.44,2,3], " +
// "\"object\": {\"key1\":\"value1\", \"key2\":256}, " +
// "\"string\": \"The quick brown fox \\\"jumps\\\" over the lazy dog \", " +
// "\"unicode\": \"\\u3041 Men\u00fa sesi\u00f3n\", " +
// "\"int\": 65536, " +
// "\"float\": 3.1415926, " +
// "\"bool\": true, " +
// "\"null\": null }";
//
// var dict = Json.Deserialize(jsonString) as Dictionary<string,object>;
//
// Debug.Log("deserialized: " + dict.GetType());
// Debug.Log("dict['array'][0]: " + ((List<object>) dict["array"])[0]);
// Debug.Log("dict['string']: " + (string) dict["string"]);
// Debug.Log("dict['float']: " + (double) dict["float"]); // floats come out as doubles
// Debug.Log("dict['int']: " + (long) dict["int"]); // ints come out as longs
// Debug.Log("dict['unicode']: " + (string) dict["unicode"]);
//
// var str = Json.Serialize(dict);
//
// Debug.Log("serialized: " + str);
// }
// }
/// <summary>
/// This class encodes and decodes JSON strings.
/// Spec. details, see http://www.json.org/
///
/// JSON uses Arrays and Objects. These correspond here to the datatypes IList and IDictionary.
/// All numbers are parsed to doubles.
/// </summary>
public static class Json
{
/// <summary>
/// Parses the string json into a value
/// </summary>
/// <param name="json">A JSON string.</param>
/// <returns>An List<object>, a Dictionary<string, object>, a double, an integer,a string, null, true, or false</returns>
public static object Deserialize(string json)
{
// save the string for debug information
if (json == null)
{
return null;
}
return Parser.Parse(json);
}
sealed class Parser : IDisposable
{
const string WORD_BREAK = "{}[],:\"";
public static bool IsWordBreak(char c)
{
return Char.IsWhiteSpace(c) || WORD_BREAK.IndexOf(c) != -1;
}
enum TOKEN
{
NONE,
CURLY_OPEN,
CURLY_CLOSE,
SQUARED_OPEN,
SQUARED_CLOSE,
COLON,
COMMA,
STRING,
NUMBER,
TRUE,
FALSE,
NULL
};
StringReader json;
Parser(string jsonString)
{
json = new StringReader(jsonString);
}
public static object Parse(string jsonString)
{
using (var instance = new Parser(jsonString))
{
return instance.ParseValue();
}
}
public void Dispose()
{
json.Dispose();
json = null;
}
Dictionary<string, object> ParseObject()
{
Dictionary<string, object> table = new Dictionary<string, object>();
// ditch opening brace
json.Read();
// {
while (true)
{
switch (NextToken)
{
case TOKEN.NONE:
return null;
case TOKEN.COMMA:
continue;
case TOKEN.CURLY_CLOSE:
return table;
default:
// name
string name = ParseString();
if (name == null)
{
return null;
}
// :
if (NextToken != TOKEN.COLON)
{
return null;
}
// ditch the colon
json.Read();
// value
table[name] = ParseValue();
break;
}
}
}
List<object> ParseArray()
{
List<object> array = new List<object>();
// ditch opening bracket
json.Read();
// [
var parsing = true;
while (parsing)
{
TOKEN nextToken = NextToken;
switch (nextToken)
{
case TOKEN.NONE:
return null;
case TOKEN.COMMA:
continue;
case TOKEN.SQUARED_CLOSE:
parsing = false;
break;
default:
object value = ParseByToken(nextToken);
array.Add(value);
break;
}
}
return array;
}
object ParseValue()
{
TOKEN nextToken = NextToken;
return ParseByToken(nextToken);
}
object ParseByToken(TOKEN token)
{
switch (token)
{
case TOKEN.STRING:
return ParseString();
case TOKEN.NUMBER:
return ParseNumber();
case TOKEN.CURLY_OPEN:
return ParseObject();
case TOKEN.SQUARED_OPEN:
return ParseArray();
case TOKEN.TRUE:
return true;
case TOKEN.FALSE:
return false;
case TOKEN.NULL:
return null;
default:
return null;
}
}
string ParseString()
{
StringBuilder s = new StringBuilder();
char c;
// ditch opening quote
json.Read();
bool parsing = true;
while (parsing)
{
if (json.Peek() == -1)
{
parsing = false;
break;
}
c = NextChar;
switch (c)
{
case '"':
parsing = false;
break;
case '\\':
if (json.Peek() == -1)
{
parsing = false;
break;
}
c = NextChar;
switch (c)
{
case '"':
case '\\':
case '/':
s.Append(c);
break;
case 'b':
s.Append('\b');
break;
case 'f':
s.Append('\f');
break;
case 'n':
s.Append('\n');
break;
case 'r':
s.Append('\r');
break;
case 't':
s.Append('\t');
break;
case 'u':
var hex = new char[4];
for (int i = 0; i < 4; i++)
{
hex[i] = NextChar;
}
s.Append((char)Convert.ToInt32(new string(hex), 16));
break;
}
break;
default:
s.Append(c);
break;
}
}
return s.ToString();
}
object ParseNumber()
{
string number = NextWord;
if (number.IndexOf('.') == -1)
{
long parsedInt;
Int64.TryParse(number, out parsedInt);
return parsedInt;
}
double parsedDouble;
Double.TryParse(number, out parsedDouble);
return parsedDouble;
}
void EatWhitespace()
{
while (Char.IsWhiteSpace(PeekChar))
{
json.Read();
if (json.Peek() == -1)
{
break;
}
}
}
char PeekChar
{
get
{
return Convert.ToChar(json.Peek());
}
}
char NextChar
{
get
{
return Convert.ToChar(json.Read());
}
}
string NextWord
{
get
{
StringBuilder word = new StringBuilder();
while (!IsWordBreak(PeekChar))
{
word.Append(NextChar);
if (json.Peek() == -1)
{
break;
}
}
return word.ToString();
}
}
TOKEN NextToken
{
get
{
EatWhitespace();
if (json.Peek() == -1)
{
return TOKEN.NONE;
}
switch (PeekChar)
{
case '{':
return TOKEN.CURLY_OPEN;
case '}':
json.Read();
return TOKEN.CURLY_CLOSE;
case '[':
return TOKEN.SQUARED_OPEN;
case ']':
json.Read();
return TOKEN.SQUARED_CLOSE;
case ',':
json.Read();
return TOKEN.COMMA;
case '"':
return TOKEN.STRING;
case ':':
return TOKEN.COLON;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '-':
return TOKEN.NUMBER;
}
switch (NextWord)
{
case "false":
return TOKEN.FALSE;
case "true":
return TOKEN.TRUE;
case "null":
return TOKEN.NULL;
}
return TOKEN.NONE;
}
}
}
/// <summary>
/// Converts a IDictionary / IList object or a simple type (string, int, etc.) into a JSON string
/// </summary>
/// <param name="json">A Dictionary<string, object> / List<object></param>
/// <returns>A JSON encoded string, or null if object 'json' is not serializable</returns>
public static string Serialize(object obj)
{
return Serializer.Serialize(obj);
}
sealed class Serializer
{
StringBuilder builder;
Serializer()
{
builder = new StringBuilder();
}
public static string Serialize(object obj)
{
var instance = new Serializer();
instance.SerializeValue(obj);
return instance.builder.ToString();
}
void SerializeValue(object value)
{
IList asList;
IDictionary asDict;
string asStr;
if (value == null)
{
builder.Append("null");
}
else if ((asStr = value as string) != null)
{
SerializeString(asStr);
}
else if (value is bool)
{
builder.Append((bool)value ? "true" : "false");
}
else if ((asList = value as IList) != null)
{
SerializeArray(asList);
}
else if ((asDict = value as IDictionary) != null)
{
SerializeObject(asDict);
}
else if (value is char)
{
SerializeString(new string((char)value, 1));
}
else
{
SerializeOther(value);
}
}
void SerializeObject(IDictionary obj)
{
bool first = true;
builder.Append('{');
foreach (object e in obj.Keys)
{
if (!first)
{
builder.Append(',');
}
SerializeString(e.ToString());
builder.Append(':');
SerializeValue(obj[e]);
first = false;
}
builder.Append('}');
}
void SerializeArray(IList anArray)
{
builder.Append('[');
bool first = true;
foreach (object obj in anArray)
{
if (!first)
{
builder.Append(',');
}
SerializeValue(obj);
first = false;
}
builder.Append(']');
}
void SerializeString(string str)
{
builder.Append('\"');
char[] charArray = str.ToCharArray();
foreach (var c in charArray)
{
switch (c)
{
case '"':
builder.Append("\\\"");
break;
case '\\':
builder.Append("\\\\");
break;
case '\b':
builder.Append("\\b");
break;
case '\f':
builder.Append("\\f");
break;
case '\n':
builder.Append("\\n");
break;
case '\r':
builder.Append("\\r");
break;
case '\t':
builder.Append("\\t");
break;
default:
int codepoint = Convert.ToInt32(c);
if ((codepoint >= 32) && (codepoint <= 126))
{
builder.Append(c);
}
else
{
builder.Append("\\u");
builder.Append(codepoint.ToString("x4"));
}
break;
}
}
builder.Append('\"');
}
void SerializeOther(object value)
{
// NOTE: decimals lose precision during serialization.
// They always have, I'm just letting you know.
// Previously floats and doubles lost precision too.
if (value is float)
{
builder.Append(((float)value).ToString("R"));
}
else if (value is int
|| value is uint
|| value is long
|| value is sbyte
|| value is byte
|| value is short
|| value is ushort
|| value is ulong)
{
builder.Append(value);
}
else if (value is double
|| value is decimal)
{
builder.Append(Convert.ToDouble(value).ToString("R"));
}
else
{
SerializeString(value.ToString());
}
}
}
}
}说下使用方法：
先定义数据类型，例如：
public class DEntry
{
public string dentry_id;
public string service_id;
public string parent_id;
public string path;
public int type;
[Obsolete("不建议使用")]
[JR(Nullable = true)]
public string inode_id;
public string name;
[JR(Nullable = true)]
public string other_name;
[JR(Nullable = true)]
public Dictionary<string, object> info;
public int scope;
[Obsolete("不建议使用")]
[JR(Nullable = true)]
public long uid;
[Obsolete("不建议使用")]
public int hits;
public long create_at;
public long update_at;
[Obsolete("不建议使用")]
public long expire_at;
public int flag;
[Obsolete("不建议使用")]
[JR(Nullable = true)]
public IndexNode inode;
[JR(Nullable = true)]
public UploadParams upload_params;
}只支持公开字段，不支持属性，可以自己改一下。
注意到其中用了一个叫JR的特性，它有两个字段，设置了Key后，序列化和反序列化将以key作为json中的key，Nullable用来指示字段可否为Null,默认为false，在反序列化时，如果json中缺少对应Key，将会抛出异常，而指定Nullable为ture后，该字段被设为类型默认值。
string UJson.ToJson(object obj) 把对象转为json
string UJson.ToJson<T>(T[] array) 把对象数组转为json
T[] ToObjectArray<T>(string j) 把json转为对象数组
T ToObject<T>(string j) 把json转为对象