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Newtonsoft.Json解析json数据(如何解析json数据)

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想了解Newtonsoft.Json解析json数据的新动态吗?本文将为您提供详细的信息,我们还将为您解答关于如何解析json数据的相关问题,此外,我们还将为您介绍关于.net使用Newtonsoft

想了解Newtonsoft.Json解析json数据的新动态吗?本文将为您提供详细的信息,我们还将为您解答关于如何解析json数据的相关问题,此外,我们还将为您介绍关于.net 使用 Newtonsoft.Json 输出树状 json字符串、.Net使用Newtonsoft.Json.dll(JSON.NET)对象序列化成json、反序列化json示例教程、Android-Gson解析JSON数据(JSON对象/JSON数组)、C# dynamic类型序列化和反序列化之Newtonsoft.Json,动态解析远端返回的jSON数据的新知识。

本文目录一览:

Newtonsoft.Json解析json数据(如何解析json数据)

Newtonsoft.Json解析json数据(如何解析json数据)

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            string JsonData="{'result':'200','info':[{'_cid':5,'_name':'Iphone4','_parentid':2,'_status':true},{'_cid':7,'_name':'手机外套',{'_cid':8,'_name':'手机模','_status':true}]}";
            WindowsFormsApplication2.BackInfo backinfo = (WindowsFormsApplication2.BackInfo)
                      JsonConvert.DeserializeObject(JsonData,typeof(WindowsFormsApplication2.BackInfo));

            if (backinfo.result == "200")//成功
            {
                List<WindowsFormsApplication2.IphoneClassify> list = backinfo.info;
                Dictionary<int,String> dic = new System.Collections.Generic.Dictionary<int,String>();
                for (int i = 0; i < list.Count; i++)
                {
                    WindowsFormsApplication2.IphoneClassify classify = (WindowsFormsApplication2.IphoneClassify)list[i];
                    dic.Add(classify._cid,classify._name);
                }
                //this.DataList1.DataSource = dic;
                //this.DataList1.DataBind();
            }
            else
            {
                //失败
            }
        }
    }
    /// <summary>
    ///返回JSON属性
    /// </summary>
    [Serializable]
    public class BackInfo
    {
        public BackInfo()
        {

        }
        public String result { get; set; }
        public List<IphoneClassify> info { get; set; }
    }

    /// <summary>
    ///产品类型
    /// </summary>
    [Serializable]
    public class IphoneClassify
    {
        public int _cid { get; set; }
        public string _name { get; set; }
        public int _parentid { get; set; }
        public bool _status { get; set; }

    }
}

.net 使用 Newtonsoft.Json 输出树状 json字符串

.net 使用 Newtonsoft.Json 输出树状 json字符串

测试环境:.net FrameWork 4.0

操作系统:window Server 2008 R2

Newtonsoft.Json 下载地址:http://json.codeplex.com/

1、解压缩下载文件夹:Json50r8

2、引入Json50r8/Bin 下的 相对应.net版本的dll文件 到项目中


执行以下代码:


using System;
using System.Collections.Generic;
using Newtonsoft.Json;

public partial class _Default : System.Web.UI.Page
{
    private string jsonString = @"[
        { 'id': '1','text': '电脑整机','parentid': '0','children': [
    { 'id': '2','text': '笔记本','parentid': '1','children': [
{ 'id': '31','text': 'SONY','parentid': '2','children': [] },{ 'id': '23','text': 'LENOVO',{ 'id': '25','text': 'IBM',{ 'id': '26','text': '宏基',{ 'id': '27','text': '联想',{ 'id': '28','text': '联想2','children': [] }
   ]
    },{ 'id': '3','text': '上网本',{ 'id': '4','text': '平板电脑',{ 'id': '5','text': '台式机',{ 'id': '6','text': '服务器','children': [] }
]
        },{ 'id': '7','text': '电脑配件','children': [
{ 'id': '8','text': 'cpu','parentid': '7',{ 'id': '9','text': '主板',{ 'id': '10','text': '显卡',{ 'id': '11','text': '硬盘',{ 'id': '12','text': '内存',{ 'id': '13','text': '机箱',{ 'id': '14','text': '电源',{ 'id': '15','text': '显示器',{ 'id': '16','text': '刻录机/光驱',{ 'id': '17','text': '声卡',{ 'id': '18','text': '扩展卡','children': [] }
]
   },{ 'id': '32','text': '手机','children': [
  {
      'id': '33','text': '诺基亚','parentid': '32','children': [
                                  { 'id': '34','text': '华为','children': [] }
                                  ]
  },{ 'id': '34','text': '三星','text': '小米','text': '苹果','children': [] }
                                                                 	]
    },'text': '篮球','parentId': '1','children': [] }
];";

    protected void Page_Load(object sender,EventArgs e)
    {
        treeNode rootNode = new treeNode();
        rootNode.id="1";
        rootNode.text="电脑整机";
        rootNode.parentid="0";
        
        treeNode childNode1 = new treeNode();
        childNode1.id="2";
        childNode1.text="笔记本";
        childNode1.parentid="1";

        treeNode childNode2 = new treeNode();
        childNode2.id="3";
        childNode2.text="SONY";
        childNode2.parentid="1";

        if (rootNode.children == null)
            rootNode.children = new List<treeNode>();

        rootNode.children.Add(childNode1);
        rootNode.children.Add(childNode2);

        string json = JsonConvert.SerializeObject(rootNode,Formatting.Indented);
    }

    /// <summary>
    /// 树结构(根据js插件定义的数据结构)
    /// </summary>
    public class treeNode
    {
        private string _id;

        private string _text;

        private string _parentid;

        private List<treeNode> _children;

        public string id
        {
            get { return _id; }
            set { _id = value; }
        }
        public string text
        {
            get { return _text; }
            set { _text = value; }
        }
        public string parentid
        {
            get { return _parentid; }
            set { _parentid = value; }
        }
        public List<treeNode> children
        {
            get { return _children; }
            set { _children = value; }
        }
    }
}

.Net使用Newtonsoft.Json.dll(JSON.NET)对象序列化成json、反序列化json示例教程

.Net使用Newtonsoft.Json.dll(JSON.NET)对象序列化成json、反序列化json示例教程

JSON作为一种轻量级的数据交换格式,简单灵活,被很多系统用来数据交互,作为一名.NET开发人员,JSON.NET无疑是最好的序列化框架,支持XML和JSON序列化,高性能,免费开源,支持LINQ查询。目前已被微软集成于webapi框架之中,因此,熟练掌握JSON.NET相当重要,这篇文章是零度参考官网整理的示例,通过这些示例,可以全面了解JSON.NET提供的功能。

Newtonsoft.Json的地址:

官网:http://json.codeplex.com/

源码地址:https://github.com/JamesNK/Newtonsoft.Json

Newtonsoft.Json.dll下载:https://github.com/JamesNK/Newtonsoft.Json/releases

1、使用Newtonsoft.Json(JSON.NET)序列化对象,通过Newtonsoft.Json.Formatting将json格式化输出。

            Account account = new Account
            {
                Email = "1930906722@qq.com",Active = true,CreatedDate =DateTime.Now,Roles = new List<string> { "User","Admin" }
            };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(account,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(json);
    public class Account
    {
        public string Name { get; set; }
        public string Email { get; set; }
        public bool Active { get; set; }
        public DateTime CreatedDate { get; set; }
        public IList<string> Roles { get; set; }
    }

执行结果:

2、使用Newtonsoft.Json(JSON.NET)序列化List集合:

            List<string> videogames = new List<string> { "HTML5","JavaScript",".net","c#",".net core" };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(videogames);
            Console.WriteLine(json);

执行结果:

3、使用Newtonsoft.Json(JSON.NET)序列化dictionary字典

            System.Collections.Generic.Dictionary<string,string> dic = new System.Collections.Generic.Dictionary<string,string>
            {
                { "Name","张三" },{ "Age","20" },{ "Email","193090622@qq.com" }
            };
            string json1 = Newtonsoft.Json.JsonConvert.SerializeObject(dic,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(json1);
            Console.WriteLine("");
            Console.WriteLine("未格式化的json:");
            string json2 = Newtonsoft.Json.JsonConvert.SerializeObject(dic,Newtonsoft.Json.Formatting.None);
            Console.WriteLine(json2);

执行结果:

4、Newtonsoft.Json(JSON.NET)将序列化结果保存到指定的文件:

            User movie = new User { Name = "张三",Age = 1993 };
            using (System.IO.StreamWriter file = System.IO.File.CreateText(@"F:\UserInfo.txt"))
            {
                Newtonsoft.Json.JsonSerializer serializer = new Newtonsoft.Json.JsonSerializer();
                serializer.Serialize(file,movie);
            }
    public class User
    {
        public string Name { set; get; }
        public int Age { set; get; }
    }

执行后保存到文件的结果:

5、Newtonsoft.Json(JSON.NET)基于枚举类型的JsonConverters转换器

            List<JosnEnum> list = new List<JosnEnum> { JosnEnum.NotStartus,JosnEnum.Startus };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(list);
            Console.WriteLine(json);
            Console.WriteLine("");

            System.Collections.Generic.Dictionary<string,int> dic = new System.Collections.Generic.Dictionary<string,int>
            { 
            {((JosnEnum)(int)JosnEnum.NotStartus).ToString(),(int)JosnEnum.NotStartus},{((JosnEnum)(int)JosnEnum.Startus).ToString(),(int)JosnEnum.Startus}
            };
            string dicJson = Newtonsoft.Json.JsonConvert.SerializeObject(dic);
            Console.WriteLine(dicJson);

            Console.WriteLine("");
            List<JosnEnum> list2 = new List<JosnEnum>
            {
                JosnEnum.NotStartus,JosnEnum.Startus
            };
            string json3 = Newtonsoft.Json.JsonConvert.SerializeObject(list2,new Newtonsoft.Json.Converters.StringEnumConverter());
            Console.WriteLine(json3);

            Console.WriteLine("");

            List<JosnEnum> result = Newtonsoft.Json.JsonConvert.DeserializeObject<List<JosnEnum>>(json3,new Newtonsoft.Json.Converters.StringEnumConverter());
            Console.WriteLine(string.Join(",",result.Select(c => c.ToString())));
    public enum JosnEnum
    {
        NotStartus = 0,Startus = 1
    }

执行结果:

6、Newtonsoft.Json(JSON.NET)通过JRaw将JS函数序列化到JSON中

            JavaScriptSettings settings = new JavaScriptSettings
            {
                OnLoadFunction = new Newtonsoft.Json.Linq.JRaw("OnLoad"),OnSucceedFunction = new Newtonsoft.Json.Linq.JRaw("function(e) { alert(e); }")
            };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(settings,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(json);
    public class JavaScriptSettings
    {
        public Newtonsoft.Json.Linq.JRaw OnLoadFunction { get; set; }
        public Newtonsoft.Json.Linq.JRaw OnSucceedFunction { get; set; }
    }

7、使用Newtonsoft.Json(JSON.NET)将json反序列化对象

  string json = @"{
   'Email': '1930906722@qq.com','Active': true,'CreatedDate': '2016-11-26 20:39','Roles': [
     'User','Admin'
]
 }";
            Account account = Newtonsoft.Json.JsonConvert.DeserializeObject<Account>(json);
            Console.WriteLine(account.Email);
    public class Account
    {
        public string Name { get; set; }
        public string Email { get; set; }
        public bool Active { get; set; }
        public DateTime CreatedDate { get; set; }
        public IList<string> Roles { get; set; }
    }

执行结果:

8、使用Newtonsoft.Json(JSON.NET)反序列化List集合:

            string json = @"['Html5','C#','.Net','.Net Core']";
            List<string> videogames = Newtonsoft.Json.JsonConvert.DeserializeObject<List<string>>(json);
            Console.WriteLine(string.Join(",videogames));

执行结果:

9、使用Newtonsoft.Json(JSON.NET)反序列化dictionary字典

            string json = @"{'Name': '张三','Age': '23'}";
            var htmlAttributes = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string,string>>(json);
            Console.WriteLine(htmlAttributes["Name"]);
            Console.WriteLine(htmlAttributes["Age"]);

执行结果:

10、使用Newtonsoft.Json(JSON.NET)序列化var匿名类型,有时候,我们并不需要先定义一个类,然后new一个对象后再进行序列化,JSON.NET支持匿名类型的序列化和反序列化。

            var test1 = new { Name = "李四",Age = 26 };
            var json = Newtonsoft.Json.JsonConvert.SerializeObject(test1);
            Console.WriteLine(json);

            Console.WriteLine("");
            var test2 = new { Name = "",Age = 0 };
            string json1 = @"{'Name':'张三','Age':'25'}";
            var result = Newtonsoft.Json.JsonConvert.DeserializeAnonymousType(json1,test2);
            Console.WriteLine(result.Name);

执行结果:

11、Newtonsoft.Json(JSON.NET)用新JSON字符串填充指定对象的属性值

            Account account = new Account
            {
                Email = "1930906722@qq.com",CreatedDate = DateTime.Now,"Admin" }
            };
            string json = @"{'Active': false,'Roles': ['Expired']}";
            Newtonsoft.Json.JsonConvert.PopulateObject(json,account);
            Console.WriteLine(account.Active);
            Console.WriteLine(account.Email);
    public class Account
    {
        public string Name { get; set; }
        public string Email { get; set; }
        public bool Active { get; set; }
        public DateTime CreatedDate { get; set; }
        public IList<string> Roles { get; set; }
    }

执行结果:

12、使用Newtonsoft.Json(JSON.NET)反序列化时可指定构造函数:

首先我们定义如下的类型,我们希望JSON.NET反序列化对象时使用第2个构造函数,我们将第一个默认构造函数屏蔽,标记为私有private修饰符。第2个构造函数需要指定一个website对象作为参数,如果提供的参数为null则抛出异常:

public class Website
{
    public string Url { get; set; }
    private Website()
    {
    }
    public Website(Website website)
    {
        if (website == null) throw new ArgumentNullException("website");
        Url = website.Url;
    }
}

现在使用一般的方式反序列化一个JSON字符串。执行出现的结果:

我们发现该序列化方法抛出了异常,并没有按照我们预想的方式进行反序列化,JSON.NET提供如下的方式指定公有构造函数。

            string json = @"{'Url':'http://www.cnblogs.com/linJie1930906722/'}";
            Website website = Newtonsoft.Json.JsonConvert.DeserializeObject<Website>(json,new Newtonsoft.Json.JsonSerializerSettings
            {
                ConstructorHandling = Newtonsoft.Json.ConstructorHandling.AllowNonPublicDefaultConstructor
            });
            Console.WriteLine(website.Url);

执行结果:

另外,JSON.NET提供了指定任何构造函数的JsonConstructorAttribute特性,只需要在构造函数上标记,即可指定构造函数。

    public class Users
    {
        public string UserName { get; private set; }
        public bool Enabled { get; private set; }
        public Users()
        {
        }
        [Newtonsoft.Json.JsonConstructor]
        public Users(string userName,bool enabled)
        {
            UserName = userName;
            Enabled = enabled;
        }
    }
            string json = @"{""UserName"": ""希特勒"",""Enabled"": true}";
            Users user = Newtonsoft.Json.JsonConvert.DeserializeObject<Users>(json);
            Console.WriteLine(user.UserName);

执行结果:

13、当对象的属性为默认值(0或null)时不序列化该属性

    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public Person Partner { get; set; }
        public decimal? Salary { get; set; }
    }
            Person person1 = new Person();
            string json1 = Newtonsoft.Json.JsonConvert.SerializeObject(person1,Newtonsoft.Json.Formatting.Indented,new Newtonsoft.Json.JsonSerializerSettings
            {
                DefaultValueHandling = Newtonsoft.Json.DefaultValueHandling.Ignore
            });
            Console.WriteLine(json1);

            Console.WriteLine("");
            Person person2 = new Person(){Name = "奥巴马"};
            string json2 = Newtonsoft.Json.JsonConvert.SerializeObject(person2,new Newtonsoft.Json.JsonSerializerSettings
            {
                DefaultValueHandling = Newtonsoft.Json.DefaultValueHandling.Ignore
            });
            Console.WriteLine(json2);

执行结果:

14、Newtonsoft.Json(JSON.NET)中忽略null值得处理器

    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public Person Partner { get; set; }
        public decimal? Salary { get; set; }
    }
            Person person = new Person { Name = "张三",Age = 46 };
            string jsonIncludeNullValues = Newtonsoft.Json.JsonConvert.SerializeObject(person,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(jsonIncludeNullValues);
            Console.WriteLine("");
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(person,new Newtonsoft.Json.JsonSerializerSettings
            {
                NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore
            });
            Console.WriteLine(json);

执行结果:

15、JSON.NET中循环引用的处理方法

            Employee employee1 = new Employee { Name = "张三" };
            Employee employee2 = new Employee { Name = "李四" };
            employee1.Manager = employee2;
            employee2.Manager = employee2;
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(employee1,new Newtonsoft.Json.JsonSerializerSettings
            {
                ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
            });
            Console.WriteLine(json);
    public class Employee
    {
        public string Name { get; set; }
        public Employee Manager { get; set; }
    }

执行结果:

16、通过ContractResolver指定属性名首字母小写,通常,在.NET中属性采用PascalCase规则(首字母大写),在JavaScript中属性名使用CamelCase规则(首字母小写),我们希望序列化后的JSON字符串符合CamelCase规则,JSON.NET提供的ContractResolver可以设置属性名小写序列化

    public class User
    {
        public string Name { set; get; }
        public int Age { set; get; }
    }
            User person = new User { Name = "张三",Age =52 };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(person,new Newtonsoft.Json.JsonSerializerSettings
            {
                ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver()
            });
            Console.WriteLine(json);

执行结果:

17、JSON.NET中通过特性序列化枚举类型

    public enum ProductStatus
    { 
        NotConfirmed,Active,Deleted
    }

    public class Product
    {
        public string Name { get; set; }

        [Newtonsoft.Json.JsonConverter(typeof(Newtonsoft.Json.Converters.StringEnumConverter))]
        public ProductStatus Status { get; set; }
    }
            Product user = new Product { Name = @"羽绒服",Status = ProductStatus.Deleted };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(user,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(json);

执行结果:

18、指定需要序列化的属性

    [Newtonsoft.Json.JsonObject(Newtonsoft.Json.MemberSerialization.OptIn)]
    public class Categroy
    {
        //Id不需要序列化
        public Guid Id { get; set; }

        [Newtonsoft.Json.JsonProperty]
        public string Name { get; set; }

        [Newtonsoft.Json.JsonProperty]
        public int Size { get; set; }
    }
            Categroy categroy = new Categroy
            {
                Id = Guid.NewGuid(),Name = "内衣",Size = 52
            };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(categroy,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(json);

执行结果:

19、序列化对象时指定属性名

    public class Videogame
    {
        [Newtonsoft.Json.JsonProperty("name")]
        public string Name { get; set; }

        [Newtonsoft.Json.JsonProperty("release_date")]
        public DateTime ReleaseDate { get; set; }
    }
            Videogame starcraft = new Videogame
            {
                Name = "英雄联盟",ReleaseDate = DateTime.Now
            };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(starcraft,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(json);

执行结果:

20、序列化时指定属性在JSON中的顺序

    public class Personl
    {
        [Newtonsoft.Json.JsonProperty(Order = 2)]
        public string FirstName { get; set; }

        [Newtonsoft.Json.JsonProperty(Order = 1)]
        public string LastName { get; set; }
    }
            Personl person = new Personl { FirstName = "张三",LastName = "李四" };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(person,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(json);

执行结果:

21、反序列化指定属性是否必须有值必须不为null,在反序列化一个JSON时,可通过JsonProperty特性的required指定反序列化行为,当反序列化行为与指定的行为不匹配时,JSON.NET将抛出异常,required是枚举,required.Always表示属性必须有值切不能为null,required.AllowNull表示属性必须有值,但允许为null值。

    public class Order
    {
        [Newtonsoft.Json.JsonProperty(required = Newtonsoft.Json.required.Always)]
        public string Name { get; set; }

        [Newtonsoft.Json.JsonProperty(required = Newtonsoft.Json.required.AllowNull)]
        public DateTime? ReleaseDate { get; set; }
    }
            string json = @"{
    'Name': '促销订单','ReleaseDate': null
  }";
            Order order = Newtonsoft.Json.JsonConvert.DeserializeObject<Order>(json);
            Console.WriteLine(order.Name);
            Console.WriteLine(order.ReleaseDate);

执行结果:

22、通过特性指定null值忽略序列化

    public class Vessel
    {
        public string Name { get; set; }

        [Newtonsoft.Json.JsonProperty(NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public DateTime? launchdate { get; set; }
    }
            Vessel vessel = new Vessel { Name = "张三" };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(vessel,Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine(json);

执行结果:

23、忽略不需要序列化的属性,并不是对象所有属性都要参与序列化,我们可以使用JsonIgnore特性排除不需要序列化的属性,下面示例中的PasswordHash将被忽略。

    public class Accounts
    {
        public string FullName { get; set; }
        public string EmailAddress { get; set; }
        [Newtonsoft.Json.JsonIgnore]
        public string PasswordHash { get; set; }
    }
            Accounts account = new Accounts
            {
                FullName = "admin",EmailAddress = "1930906722@qq.com",PasswordHash = "dfsfgerhtyhsasdhjyujtgwe454811sfsg8d"
            };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(account);
            Console.WriteLine(json);

执行结果:

24、序列化或反序列化时指定日期时间格式,JSON.NET中提供一个名为JsonSerializerSettings的设置对象,可通过此对象设置很多序列化和反序列化的行为,如果要设置JSON.NET序列化输出的日期时间格式,只需要指定格式化字符串即可。通过JsonSerializerSettings的DateFormatString属性指定日期时间格式:

    public class Customer
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime CreateDate { get; set; }
    }
            Customer custom = new Customer { FirstName = "张三",LastName = "李四",CreateDate = DateTime.Now };
            Newtonsoft.Json.JsonSerializerSettings settings = new Newtonsoft.Json.JsonSerializerSettings
            {
                DateFormatString = "yyyy-MM-dd HH:mm:ss",Formatting = Newtonsoft.Json.Formatting.Indented
            };
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(custom,settings);
            Console.WriteLine(json);

执行结果:

Android-Gson解析JSON数据(JSON对象/JSON数组)

Android-Gson解析JSON数据(JSON对象/JSON数组)

上一篇博客,Android-解析JSON数据(JSON对象/JSON数组),介绍了使用 org.json.JSONArray;/org.json.JSONObject; 来解析JSON数据;

 

Google Android 还提供来另外一种方式来解析JSON数据,那就是Gson;

Gson是非常方便的JSON解析/封装/处理等等,强大的工具类:

  特点:Gson可以把JSON对象数据->转换映射为Bean对象

       Gson可以把JSON数组数据->转换映射为集合

     Gson可以把Bean对象->转换为JSON对象数据

     Gson可以把集合->转换为JSON数组数据

        ........... 

 

首先要在app/build.gradle配置文件中,导入,Gson支持包

// Gson支持包的导入
implementation ''com.google.code.gson:gson:2.6.2''

 


 

需要解析的JSON数据:

/data/data/liudeli.mynetwork01/files/pottingJSON1

{
    "name":"李四",
    "age":99,
    "hobby":"爱好是练习截拳道"
}

 

/data/data/liudeli.mynetwork01/files/pottingJSONArray1

[
    {
        "name":"君君",
        "age":89,
        "sex":"男"
    },
    {
        "name":"小君",
        "age":99,
        "sex":"女"
    },
    {
        "name":"大君",
        "age":88,
        "sex":"男"
    }
]

 

定义一个Bean
定义的name/age/hobby 必须要和JSON数据里面的一模一样 

package liudeli.mynetwork01.entity;

/**
 * 定义一个Bean
 * 定义的name/age/hobby 必须要和JSON数据里面的一模一样
 * {
 *     "name":"李四",
 *     "age":99,
 *     "hobby":"爱好是练习截拳道"
 * }
 */
public class Student2 {

    private String name;
    private int age;
    private String hobby;

    public Student2(String name, int age, String hobby) {
        this.name = name;
        this.age = age;
        this.hobby = hobby;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name=''" + name + ''\'''' +
                ", age=" + age +
                ", hobby=''" + hobby + ''\'''' +
                ''}'';
    }
}

  

定义的name/age/sex 必须要和JSON数据里面的一模一样

package liudeli.mynetwork01.entity;

/**
 * 定义一个Bean
 * 定义的name/age/sex 必须要和JSON数据里面的一模一样
 *
 * [
 *     {
 *         "name":"君君",
 *         "age":89,
 *         "sex":"男"
 *     },
 *     {
 *         "name":"小君",
 *         "age":99,
 *         "sex":"女"
 *     },
 *     {
 *         "name":"大君",
 *         "age":88,
 *         "sex":"男"
 *     }
 * ]
 */
public class Student {

    private String name;
    private int age;
    private String sex;

    public Student(String name, int age, String sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name=''" + name + ''\'''' +
                ", age=" + age +
                ", sex=''" + sex + ''\'''' +
                ''}'';
    }
}

 

GsonAnalyzeJSONActivity.java

package liudeli.mynetwork01;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.List;

import liudeli.mynetwork01.entity.Student;
import liudeli.mynetwork01.entity.Student2;

public class GsonAnalyzeJSONActivity extends Activity {

    private final String TAG = GsonAnalyzeJSONActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_gson_analyze);
    }

    /**
     * Gson解析JSON对象
     * {
     *     "name":"李四",
     *     "age":99,
     *     "hobby":"爱好是练习截拳道"
     * }
     */
    public void gonsAnalyzeJSONObject(View view) {
       String jsonData = readFile("pottingJSON1");
       // Log.d(TAG, "jsonData:" + jsonData);

       Gson gson = new Gson();
       Student2 student2 = gson.fromJson(jsonData, Student2.class);
       Log.d(TAG, "gonsAnalyzeJSONObject 解析后的结果:" + student2.toString());
    }

    /**
     * Gson解析JSON数组
     * [
     *     {
     *         "name":"君君",
     *         "age":89,
     *         "sex":"男"
     *     },
     *     {
     *         "name":"小君",
     *         "age":99,
     *         "sex":"女"
     *     },
     *     {
     *         "name":"大君",
     *         "age":88,
     *         "sex":"男"
     *     }
     * ]
     * @param view
     */
    public void gonsAnalyzeJSONArray(View view) {
        String jsonData = readFile("pottingJSONArray1");
        // Log.d(TAG, "jsonData:" + jsonData);

        Gson gson = new Gson();

        /**
         * TypeToken<List<需要映射的Bean对象>>(){}.getType()
         */
        List<Student> list = gson.fromJson(jsonData, new TypeToken<List<Student>>(){}.getType()); // 参数二:需要指定类型,类型来决定解析的集合

        for (Student student: list) {
            Log.d(TAG, "gonsAnalyzeJSONArray 解析后的结果:" + student.toString());
        }

    }

    /**
     * 读取文件里面的字符串
     * @param fileName
     * @return
     */
    private String readFile(String fileName) {
        String result = null;
        try {
            InputStream inputStream = openFileInput(fileName);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] bytes = new byte[inputStream.available()];

            inputStream.read(bytes);

            baos.write(bytes, 0,bytes.length);

            result = new String(baos.toByteArray());

            baos.close();
            inputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

 

activity_gson_analyze.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Gson解析JSON对象"
        android:onClick="gonsAnalyzeJSONObject"
        />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Gson解析JSON数组"
        android:onClick="gonsAnalyzeJSONArray"
        />

</LinearLayout>

 

日志的打印:

使用Gson解析,JSON对象数据:

12-23 23:00:52.108 9729-9729/liudeli.mynetwork01 D/GsonAnalyzeJSONActivity: gonsAnalyzeJSONObject 解析后的结果:Student{name=''李四'', age=99, hobby=''爱好是练习截拳道''}

 

使用Gson解析,JSON数组数据:

12-23 23:00:53.199 9729-9729/liudeli.mynetwork01 D/GsonAnalyzeJSONActivity: gonsAnalyzeJSONArray 解析后的结果:Student{name=''君君'', age=89, sex=''男''}
12-23 23:00:53.199 9729-9729/liudeli.mynetwork01 D/GsonAnalyzeJSONActivity: gonsAnalyzeJSONArray 解析后的结果:Student{name=''小君'', age=99, sex=''女''}
12-23 23:00:53.199 9729-9729/liudeli.mynetwork01 D/GsonAnalyzeJSONActivity: gonsAnalyzeJSONArray 解析后的结果:Student{name=''大君'', age=88, sex=''男''}

 

C# dynamic类型序列化和反序列化之Newtonsoft.Json,动态解析远端返回的jSON数据

C# dynamic类型序列化和反序列化之Newtonsoft.Json,动态解析远端返回的jSON数据

一、说明

1.Newtonsoft.Json 中的Linq To Json中提供了方便的json数据查询、修改等操作。

例如:JObject,JArray

2.在JObject.FromObject()或JArray.FromObject()中也提供了对dynamic类型的支持。

二、dynamic转json字符串处理

 

  1.  
    using Newtonsoft.Json;
  2.  
    using Newtonsoft.Json.Linq;

1.使用JObject对象

 

  1.  
    dynamic obj = new JObject();
  2.  
    obj.name = "张三丰";
  3.  
    obj.age = 10;
  4.  
    obj.birthday = DateTime.Now;
  5.  
     
  6.  
    Console.WriteLine(obj.ToString());

输出结果:

 

  1.  
    {
  2.  
    "name": "张三丰",
  3.  
    "age": 10,
  4.  
    "birthday": "2017-07-29T16:39:47.4549601+08:00"
  5.  
    }


2.使用JObject.FromObject()

 

  1.  
    dynamic obj = new System.Dynamic.ExpandoObject();
  2.  
    obj.name = "张三丰";
  3.  
    obj.age = 10;
  4.  
    obj.birthday = DateTime.Now;
  5.  
     
  6.  
    string result = JObject.FromObject(obj).ToString();
  7.  
    Console.WriteLine(result);

输出结果:同上

三、将json字符串发序列化为dynamic类型

 

  1.  
    string json = @"
  2.  
    {
  3.  
    ''Title'': ''Json.NET is awesome!'',
  4.  
    ''Author'': {
  5.  
    ''Name'': ''James Newton-King'',
  6.  
    ''Twitter'': ''@JamesNK'',
  7.  
    ''Picture'': ''/jamesnk.png''
  8.  
    },
  9.  
    ''Date'': ''2013-01-23T19:30:00'',
  10.  
    ''BodyHtml'': ''<h3>Title!</h3>\r\n<p>Content!</p>''
  11.  
    }
  12.  
    ";
  13.  
    dynamic blogPost = JObject.Parse(json);
  14.  
    string title = blogPost.Title;
  15.  
    Console.WriteLine(title); //输出:Json.NET is awesome!
  16.  
    Console.WriteLine(blogPost.Date); //输出:2013/1/ 23 19:30:00


官方示例:

Querying JSON with dynamicCreate JSON with dynamic

更多:

C# Newtonsoft.Json JsonSerializerSettings配置序列化操作

C#Json序列化、反序列化之Dictionary 字典类型

C# Newtonsoft.Json之LINQ To Json实例(二)

 

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