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Java中利用gson解析Json实例教程
前言
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json数据
{
"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
} 解析JSONObject
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;
import com.google.gson.JsonIOException;
import java.io.FileNotFoundException;
import java.io.FileReader;
public class ReadJson {
public static void main(String []args) {
JsonParser parse = new JsonParser();
try {
JsonObject json = (JsonObject) parse.parse(new FileReader("weather.json"));
System.out.println("resultcode:" + json.get("resultcodeu").getAsInt());
System.out.println("reason:" + json.get("reason").getAsString());
JsonObject result = json.get("result").getAsJsonObject();
JsonObject today = result.get("today").getAsJsonObject();
System.out.println("weak:" + today.get("week").getAsString());
System.out.println("weather:" + today.get("weather").getAsString());
} catch (JsonIOException e) {
e.printStackTrace();
} catch (NullPointerException e) {
e.printStackTrace();
} catch (JsonSyntaxException e){
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}解析JSONArray
import com.google.gson.JsonParser;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonSyntaxException;
import com.google.gson.JsonIOException;
import java.io.FileNotFoundException;
import java.io.FileReader;
public class ReadJsonArray {
public static void main(String []args) {
JsonParser parse = new JsonParser();
try {
JsonObject json = (JsonObject)parse.parse(new FileReader("C:\\Users\\wzh94434\\IdeaProjects\\TestProject\\jsontest\\src\\main\\java\\weather.json"));
JsonObject result = json.get("result").getAsJsonObject();
JsonArray futureArray = result.get("future").getAsJsonArray();
for (int i = 0; i < futureArray.size(); ++i) {
JsonObject subObj = futureArray.get(i).getAsJsonObject();
System.out.println("------");
System.out.println("week:" + subObj.get("week").getAsString());
System.out.println("weather:" + subObj.get("weather").getAsString());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (JsonIOException e) {
e.printStackTrace();
} catch (JsonSyntaxException e) {
e.printStackTrace();
}
}
}注意：文件路径相对路径是从工程根目录开始
总结
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