基于Unity3D的JSON文件的存储的实现

在unity的开发中，经常会用到Json来存储数据文件。如下我将带领大家来实现一套json文件的存储系统。功能如下：

1.若没有json文件，将创建一个json文件，并赋值为数据类StudentData中的数据；

2.若存在json文件，将读取json文件中的数据，并赋值给数据类StudentData；

3.实现对json文件的增，删，改，查。

（注意：本代码使用LitJson.dll进行解析，需把LitJson.dll放入到Unity的Assets中的任意文件夹中 Json官网：http://www.json.org）

代码如下：

学生数据类StudentData

using System.Collections;using System.Collections.Generic;using UnityEngine;//性别枚举public enum SexType{None,Female,Male}[System.Serializable]//课程分数public class Grade{public float math;public float physics;public float english;}[System.Serializable]//学生类public class StudentData {//学号public float id;//学号public string name;//性别public SexType sexType=SexType.None;//年龄public int age; //是否统考public bool bCylet;//成绩public Grade grade;//存储的文件名public const string FILENAME="StudentData";public StudentData(float id,string name,SexType sexType,int age,bool bCylet,Grade grade){this.id = id;this.name = name;this.sexType = sexType;this.age = age;this.bCylet = bCylet;this.grade = grade;}}

Json文件管理

using UnityEngine;using System.Collections;using System.IO;using System.Text;using System;using LitJson;public class JsonMgr : MonoBehaviour {    public static JsonMgr _instance;    //学生数据类    public StudentData studentData;    void Awke()    {        _instance = this;    }    void Start()    {if (File.Exists(Application.dataPath + "//" + StudentData.FILENAME)) {studentData = ParseFile (Application.dataPath, StudentData.FILENAME);        }        else        {CreateFile(Application.dataPath, StudentData.FILENAME, studentData);        }    }    //创建json文件void CreateFile(string filePath,string fileName,StudentData studentData)    {        StringBuilder stringBuilder = new StringBuilder();        JsonWriter jsonWriter = new JsonWriter(stringBuilder);        jsonWriter.WriteObjectStart();        jsonWriter.WritePropertyName("id");jsonWriter.Write(studentData.id);        jsonWriter.WritePropertyName("name");jsonWriter.Write(studentData.name);jsonWriter.WritePropertyName("sexType");jsonWriter.Write(studentData.sexType.ToString());jsonWriter.WritePropertyName("age");jsonWriter.Write(studentData.age);jsonWriter.WritePropertyName("bCylet");jsonWriter.Write(studentData.bCylet);jsonWriter.WritePropertyName ("grade");jsonWriter.WriteArrayStart ();jsonWriter.WriteObjectStart ();jsonWriter.WritePropertyName ("math");jsonWriter.Write (studentData.grade.math);jsonWriter.WriteObjectEnd ();jsonWriter.WriteObjectStart ();jsonWriter.WritePropertyName ("physics");jsonWriter.Write (studentData.grade.physics);jsonWriter.WriteObjectEnd ();jsonWriter.WriteObjectStart ();jsonWriter.WritePropertyName ("english");jsonWriter.Write (studentData.grade.english);jsonWriter.WriteObjectEnd ();               jsonWriter.WriteArrayEnd();        jsonWriter.WriteObjectEnd();FileStream fileStream = new FileStream(filePath + "//" + fileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite);        StreamWriter streamWriter = new StreamWriter(fileStream);        streamWriter.WriteLine(stringBuilder.ToString());        streamWriter.Close();        fileStream.Close();        fileStream.Dispose();    }    //解析json文件private StudentData ParseFile(string filePath, string fileName)    {StudentData studentData = null;if (File.Exists(filePath + "//" + fileName))        {float id;string name;SexType sexType=SexType.None;int age;bool bCylet;Grade grade=new Grade();            FileStream fileStream = new FileStream(filePath + "//" + fileName, FileMode.Open, FileAccess.Read, FileShare.Read);            StreamReader streamReader = new StreamReader(fileStream);string strData = streamReader.ReadToEnd ();            JsonData jsonData = JsonMapper.ToObject(strData);id = float.Parse (jsonData ["id"].ToString ());name = jsonData["name"].ToString();sexType = (SexType)Enum.Parse (typeof(SexType), jsonData ["sexType"].ToString ());age = int.Parse (jsonData ["age"].ToString());bCylet = bool.Parse (jsonData ["bCylet"].ToString());grade.math = float.Parse(jsonData ["grade"] [0] ["math"].ToString ());grade.physics= float.Parse(jsonData ["grade"] [1] ["physics"].ToString ());grade.english= float.Parse(jsonData ["grade"] [2] ["english"].ToString ());studentData =new StudentData(id,name,sexType,age,bCylet,grade);}return studentData;    }    void OnApplicationQuit()    {CreateFile(Application.dataPath, StudentData.FILENAME,studentData);    }}

生成的Json文件

{    "id": 1303070223,    "name": "zhangsan",    "sexType": "Male",    "age": 23,    "bCylet": true,    "grade": [        {            "math": 96        },        {            "physics": 99        },        {            "english": null        }    ]}