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

来源：http://www.cnblogs.com/kaituorensheng/p/6616126.html