Json解析

Javascript:

1.使用eval
var parse_json_by_eval = function(str){
    return eval（'('+str+')');
}
var value = 1;
var jsonstr = '{"name":"jifeng","company":"taobao","value":++value}';
var json1 = parse_json_by_eval（jsonstr);
console.log(json1);
console.log('value: '+ value);    
執行結果： 

{ name: 'jifeng', company: 'taobao', value: 2 }
value: 2
2.使用JSON.parse 
var parse_json_by_JSON_parse = function(str){
    return JSON.parse(str);
}
value = 1;
var jsonstr = '{"name":"jifeng","company":"taobao"}';
var json2 = parse_json_by_JSON_parse(jsonstr);
console.log(json2);
console.log(value);
From：javascript:void(0)

​

PHP:

$json_string='{"id":1,"name":"jb51","email":"[e-mail]","interest":["wordpress","php"]} '; 
$obj=json_decode($json_string); 
echo $obj->name; //prints foo 
echo $obj->interest[1]; //prints php

Java:

JSONObject  dataJson=new JSONObject("你的Json数据“);
JSONObject  response=dataJson.getJSONObject("response");
JSONArray data=response.getJSONArray("data");
JSONObject info=data.getJSONObject(0);
String province=info.getString("province");
String city=info.getString("city");
String district=info.getString("district");
String address=info.getString("address");
 System.out.println(province+city+district+address);

C#:

使用开源的类库Newtonsoft.Json(下载地址http://json.codeplex.com/)。下载后加入工程就能用。通常可以使用JObject, JsonReader, JsonWriter处理。这种方式最通用，也最灵活，可以随时修改不爽的地方。
(1)使用JsonReader读Json字符串：
[csharp] view plaincopy
string jsonText =@"{""input"" : ""value"",""output"" : ""result""}";  
JsonReader reader = new JsonTextReader(newStringReader(jsonText));  
while (reader.Read())  
{  
   Console.WriteLine(reader.TokenType + "\t\t" + reader.ValueType+ "\t\t" + reader.Value);  
}  

(2)使用JsonWriter写字符串：
[csharp] view plaincopy
StringWriter sw = new StringWriter();  
JsonWriter writer = new JsonTextWriter(sw);  
   
writer.WriteStartObject();  
writer.WritePropertyName("input");  
writer.WriteValue("value");  
writer.WritePropertyName("output");  
writer.WriteValue("result");  
writer.WriteEndObject();  
writer.Flush();  
   
string jsonText =sw.GetStringBuilder().ToString();  
Console.WriteLine(jsonText);  

(3)使用JObject读写字符串：
[csharp] view plaincopy
JObject jo = JObject.Parse(jsonText);  
string[] values =jo.Properties().Select(item => item.Value.ToString()).ToArray();  

(4)使用JsonSerializer读写对象(基于JsonWriter与JsonReader):
数组型数据
[csharp] view plaincopy
string jsonArrayText1 ="[{'a':'a1','b':'b1'},{'a':'a2','b':'b2'}]";  
JArray ja =(JArray)JsonConvert.DeserializeObject(jsonArrayText1);  
string ja1a =ja[1]["a"].ToString();  
//或者  
JObject o = (JObject)ja[1];  
string oa = o["a"].ToString();

Python:

import json
data= json.loads('{"ID": "2", "IP":"12.12.12.12", "Port": "3000", "Sensor_Count":"1", "Control_Count": "1", "Sensors":{"Sensor_Name": "tem", "Type_Count": "1", "Types":{ "types":["temp","C"],"types":["hum","N"],}},"Controls":["LCD","Relay"] }')
print data.ID
输出结果:"2"
data = json.dump(data)
print data
输出结果:{"ID": "2", "IP":"12.12.12.12", "Port": "3000", "Sensor_Count":"1", "Control_Count": "1", "Sensors":{"Sensor_Name": "tem", "Type_Count": "1", "Types":{ "types":["temp","C"],"types":["hum","N"],}},"Controls":["LCD","Relay"] }

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