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JAVA解析JSON数据

转自:http://www.cnblogs.com/boy1025/p/4551593.html

 

 

3.解析JSON数据(小编使用的GSON进行json数据的解析)

3-1 【JSONObject的解析】

下面是一个json文件:

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{
    "resultcode""200",
    "reason""successed!",
    "result": {
        "sk": {
            "temp""24",
            "wind_direction""西南风",
            "wind_strength""2级",
            "humidity""51%",
            "time""10:11"
        },
        "today": {
            "temperature""16℃~27℃",
            "weather""阴转多云",
            "weather_id": {
                "fa""02",
                "fb""01"
            },
            "wind""西南风3-4 级",
            "week""星期四",
            "city""滨州",
            "date_y""2015年06月04日",
            "dressing_index""舒适",
            "dressing_advice""建议着长袖T恤、衬衫加单裤等服装。年老体弱者宜着针织长袖衬衫、马甲和长裤。",
            "uv_index""最弱",
            "comfort_index""",
            "wash_index""较适宜",
            "travel_index""",
            "exercise_index""较适宜",
            "drying_index"""
        },
        "future": [
            {
                "temperature""16℃~27℃",
                "weather""阴转多云",
                "weather_id": {
                    "fa""02",
                    "fb""01"
                },
                "wind""西南风3-4 级",
                "week""星期四",
                "date""20150604"
            },
            {
                "temperature""20℃~32℃",
                "weather""多云转晴",
                "weather_id": {
                    "fa""01",
                    "fb""00"
                },
                "wind""西风3-4 级",
                "week""星期五",
                "date""20150605"
            },
            {
                "temperature""23℃~35℃",
                "weather""多云转阴",
                "weather_id": {
                    "fa""01",
                    "fb""02"
                },
                "wind""西南风3-4 级",
                "week""星期六",
                "date""20150606"
            },
            {
                "temperature""20℃~33℃",
                "weather""多云",
                "weather_id": {
                    "fa""01",
                    "fb""01"
                },
                "wind""北风微风",
                "week""星期日",
                "date""20150607"
            },
            {
                "temperature""22℃~34℃",
                "weather""多云",
                "weather_id": {
                    "fa""01",
                    "fb""01"
                },
                "wind""西南风3-4 级",
                "week""星期一",
                "date""20150608"
            },
            {
                "temperature""22℃~33℃",
                "weather""阴",
                "weather_id": {
                    "fa""02",
                    "fb""02"
                },
                "wind""西南风3-4 级",
                "week""星期二",
                "date""20150609"
            },
            {
                "temperature""22℃~33℃",
                "weather""多云",
                "weather_id": {
                    "fa""01",
                    "fb""01"
                },
                "wind""南风3-4 级",
                "week""星期三",
                "date""20150610"
            }
        ]
    },
    "error_code"0
}

我们进行解析(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();  //创建json解析器
        try {
            JsonObject json=(JsonObject) parse.parse(new FileReader("weather.json"));  //创建jsonObject对象
            System.out.println("resultcode:"+json.get("resultcode").getAsInt());  //将json数据转为为int型的数据
            System.out.println("reason:"+json.get("reason").getAsString());     //将json数据转为为String型的数据
             
            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();
        }
    }
}

输出结果:

技术分享

 

3-2 【JSONArray的解析】

下面是一个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
}

我们进行解析:

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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 ReadJSON {
    public static void main(String args[]){
        try {
             
            JsonParser parser=new JsonParser();  //创建JSON解析器
            JsonObject object=(JsonObject) parser.parse(new FileReader("test.json"));  //创建JsonObject对象
            System.out.println("cat="+object.get("cat").getAsString()); //将json数据转为为String型的数据
            System.out.println("pop="+object.get("pop").getAsBoolean()); //将json数据转为为boolean型的数据
             
            JsonArray array=object.get("language").getAsJsonArray();    //得到为json的数组
            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();
        }
    }
}

输出结果:

技术分享

JAVA解析JSON数据