AnalysisJson#1

1.什麼是JSON？ （http://www.json.org/）

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language.

 

2.Json數據類型

2-1.json對象

2-2.json數組

 

3.解析JSON數據（小編使用的GSON進行json數據的解析）

3-1 【JSONObject的解析】

下面是一段json數據：

{
    "resultcode": "200",
    "reason": "successed!",
    "result": {
        "sk": {
            "temp": "24",
            "wind_direction": "西南風",
            "wind_strength": "2級",
            "humidity": "51%",
            "time": "10:11"
        },
        "today": {
            "temperature": "16℃~27℃",
            "weather": "陰轉多雲",
            "weather_id": {
                "fa": "02",
                "fb": "01"
            },
            "wind": "西南風3-4 級",
            "week": "星期四",
        },
        "future": [
            {
                "temperature": "16℃~27℃",
                "weather": "陰轉多雲",
                "weather_id": {
                    "fa": "02",
                    "fb": "01"
                },
                "wind": "西南風3-4 級",
                "week": "星期四",
                "date": "20150604"
            }, 
        ]
    },
    "error_code": 0
}

我們進行解析（解析一部分）：

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package cn.edu.bzu.json;   import java.io.FileNotFoundException; import java.io.FileReader;   import com.google.gson.JsonArray; import com.google.gson.JsonIOException; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import com.google.gson.JsonSyntaxException;   public class Read {     public static void main(String args[]){         JsonParser parse =new JsonParser();  //創建json解析器         try {             JsonObject json=(JsonObject) parse.parse(new FileReader("weather.json"));                  //創建jsonObject對象             System.out.println("resultcode:"+json.get("resultcode").getAsInt());                   //將json數據轉爲爲int型的數據             System.out.println("reason:"+json.get("reason").getAsString());                      //將json數據轉爲爲String型的數據                           JsonObject result=json.get("result").getAsJsonObject();             JsonObject today=result.get("today").getAsJsonObject();             System.out.println("temperature:"+today.get("temperature").getAsString());             System.out.println("weather:"+today.get("weather").getAsString());                       } catch (JsonIOException e) {             e.printStackTrace();         } catch (JsonSyntaxException e) {             e.printStackTrace();         } catch (FileNotFoundException e) {             e.printStackTrace();         }     } }

3-2 【JSONArray的解析】

下面是一個json文件

{
"cat":"it",
"language":[
{"id":1,"ide":"eclipse","name":Java},
{"id":2,"ide":"XCode","name":"Swift"},
{"id":3,"ide":"Visual Stdio","name":"C#"}
],
"pop":true
}

解析：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38	package cn.edu.bzu.json;   import java.io.FileNotFoundException; import java.io.FileReader;   import com.google.gson.JsonArray; import com.google.gson.JsonIOException; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import com.google.gson.JsonSyntaxException;   public class ReadJSON {     public static void main(String args[]){         try {                           JsonParser parser=new JsonParser();   //創建JSON解析器             JsonObject object=(JsonObject) parser.parse(new FileReader("test.json"));   //創建JsonObject對象             System.out.println("cat="+object.get("cat").getAsString());  //將json數據轉爲爲String型的數據             System.out.println("pop="+object.get("pop").getAsBoolean());  //將json數據轉爲爲boolean型的數據                           JsonArray array=object.get("language").getAsJsonArray();     //得到爲json的數組             for(int i=0;i<array.size();i++){                 System.out.println("---------------");                 JsonObject subObject=array.get(i).getAsJsonObject();                 System.out.println("id="+subObject.get("id").getAsInt());                 System.out.println("name="+subObject.get("name").getAsString());                 System.out.println("ide="+subObject.get("ide").getAsString());             }                       } catch (JsonIOException e) {             e.printStackTrace();         } catch (JsonSyntaxException e) {             e.printStackTrace();         } catch (FileNotFoundException e) {             e.printStackTrace();         }     } }

3-3 【分析】

我們通過Gson進行解析，所以在使用前需要導入Gson.jar

解析json數據時，

1.需要進行創建Gson解析器

2.創建JSONObject對象

3.將json數據轉爲爲相應的數據

 

4.源代碼下載：

https://github.com/monsterLin/TestReadJSON

5.轉載：

https://www.cnblogs.com/boy1025/p/4551593.html