We Keep Coding

how to get same fields from jsonArray

using gson, I parsed data in json format and now I need to extract the value "dt_txt" and their value "temp" from this data and I don’t understand how to pull and paste them into the collection where the key is "dt_txt" and its value is "temp "
The data that I received: https://imgur.com/a/qAxwEri
package testClassPackage;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
public class weatherParse {
public static void main(String[] args) throws IOException {
String sURL = "http://api.openweathermap.org/data/2.5/forecast/?q=Odessa,ua&APPID=518a64dd48106aa542464d3bd94d12ce"; //just a string
// Connect to the URL using java's native library
URL url = new URL(sURL);
URLConnection request = url.openConnection();
request.connect();
// Convert to a JSON object to print data
JsonParser jp = new JsonParser(); //from gson
JsonElement root = jp.parse(new InputStreamReader((InputStream) request.getContent())); //Convert the input stream to a json element
JsonObject rootobj = root.getAsJsonObject(); //May be an array, may be an object.
JsonArray message = rootobj.get("list").getAsJsonArray();
for (int i = 0; i < message.size(); i++) {
System.out.println();
}
System.out.println(message);
}
}

iterate over the JsonArray(message I changed to messages here) as JsonElement and get main object from the element then fetch th corresponding temp.
Map<String,String> data = new HashMap<>();
for(JsonElement lst : messages) {
JsonObject lstObject = lst.getAsJsonObject();
JsonObject el = (JsonObject) lstObject.get("main");
System.out.println(lstObject.get("dt_txt").getAsString() +" "+el.get("temp").getAsString());
data.put(lstObject.get("dt_txt").getAsString(), el.get("temp").getAsString());
}

How to replace "emailRecipients" key value from a json object in java

I need to replace emailRecipients value with some other value.
Here is JSON
{"payload": {"injectedDetails": "{\"injectedDetails\":\"test\"}","originalPayload": "{\"messageId\":\"232342",
\"emailRecipients\":[\"test#abc.com\"]}"},
"status": "OK"
}
I Tried below, but its putting a new key rather than replacing the existing once.even tried with putOnce()
jsonObjOriInj=new JSONObject(jsonobjectString);
jsonObjOriInj.put("emailRecipients", "2323");

Your JSON is not valid, but assuming JSON should be in following format,
{
"payload": {
"injectedDetails": {
"injectedDetails": "test"
}
},
"originalPayload": {
"messageId": "232342",
"emailRecipients":[
"test#abc.com"
]
},
"status": "OK"
}
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class Main {
public static void main(String[] args) throws ParseException {
String data = "{\"payload\":{\"injectedDetails\":{\"injectedDetails\":\"test\"}},\"originalPayload\":{\"messageId\":\"232342\",\"emailRecipients\":[\"test#abc.com\"]},\"status\":\"OK\"}";
JSONParser parser = new JSONParser();
JSONObject jsonObject = (JSONObject) parser.parse(data);
//get originalPayload object
JSONObject originalPayload = (JSONObject) jsonObject.get("originalPayload");
// create new json array
JSONArray newEmailRecipients = new JSONArray();
// add new email recipients
newEmailRecipients.add("updated_test#abc.com");
// update originalPayload object with new emailRecipients
originalPayload.put("emailRecipients", newEmailRecipients);
// update JSON with updates originalPayload object
jsonObject.put("originalPayload", originalPayload);
System.out.println(jsonObject);
}
}
Output:
{"payload":{"injectedDetails":{"injectedDetails":"test"}},"originalPayload":{"messageId":"232342","emailRecipients":"[updated_test#abc.com]"},"status":"OK"}

Writing JSON Object as Object not as String to File

I want to write a JSON Object to a file.Currently I have tried using ObjectMapper and Gson but they are writing the JSON as JSONString, Thus the output file has JSON string rather than object. So is there a way JSON Object is written as Object rather than String
JSONObject responseData = new JSONObject(response.getBody().toString());
org.json.simple.JSONObject object = new
org.json.simple.JSONObject(responseData.toMap());
ObjectMapper objMapper = new ObjectMapper();
objMapper.writeValue(new File(path) , object);
Now the above code is writing the JSON Object as String in to file not a JSONObject.

Don't use ObjectMapper. You can achieve this with org.json.simple.* package itself.
package com.tutorial
import java.io.FileWriter;
import java.io.IOException;
import org.json.simple.JSONObject;
public class JosnObjectWrite {
public static void main(String[] args) throws IOException {
JSONObject responseData = new JSONObject(response.getBody().toString());
JSONObject object = new JSONObject(responseData.toMap());
try (FileWriter file = new FileWriter("/Users/<username>/Documents/file1.txt")) {
file.write(object.toJSONString());
System.out.println("Successfully Copied JSON Object to File...");
System.out.println("\nJSON Object: " + object);
}
}
}

parse json string using simple-json

I have read the posts that appeared to be the same as my question but I must be missing something. My environment is Eclipse Mars. My JAVA is 1.7 and I have imported json-simple. I simply wish to parse the json that is returned from my web service. I control the web service if I need to modify its output. I see the json in arg[0] as noted below however the Object obj is null as of course is the JSONArray array. I know that I am missing something basic but I am stumped and a bit tired.
Here is the returned json:
[{"$id":"1","NumberID":121183,"PortfolioID":718,"PropertyID":14489,"Adsource":17287,"PlanTypeID":1,"GreetingFile":"HolidayGreeting.wav","PromptFile1":"senior.leasing.first.wav","Accepts1":2,"PromptAction_ID1":1,"PromptFile2":"Default.wav","Accepts2":2,"PromptAction_ID2":1,"PromptFile3":"Default.wav","Accepts3":2,"PromptAction_ID3":1,"PromptFile4":"Default.wav","Accepts4":2,"PromptAction_ID4":1,"PromptFile5":"Default.wav","Accepts5":2,"PromptAction_ID5":1,"HoldMsgFile1":"SpectrumHold.wav","HoldMsgFile2":"Default.wav","Destination1":15197,"Destination2":15024,"Destination3":0,"UIType_ID":16,"RingCount":0,"Enabled":true,"Spanish":false,"HoldMusicFile":"Hold_Music.wav","Template_ID":41,"FrontLineForward":true,"DisclaimerFIle":"1Silence.wav"}]
Here is the parse code employing json-simple:
package parser;
import org.json.simple.*;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import java.io.*;
public class JsonParser
{
private static JSONObject _jsonInput;
public static void main(String[] args)
{
//TODO
try{
JSONParser parser = new JSONParser();
Object obj = JSONValue.parse(args[0]);
JSONArray array=(JSONArray)obj;
String name = array.get(3).toString();
System.out.println(obj);
}
catch(Exception e){
e.printStackTrace();
}
}
}

The size of the array different than the index used
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader(args[1]));
JSONArray array=(JSONArray)obj;
if (array.size() > 3)
String name = array.get(3).toString();

Why does my JSON-Simple JSONArray give me a nullpointer exception?

I'm following this tutuorial here, and my JSON object is near enough the same, except I have this sort of format:
{"user":{
"SomeKeys":"SomeValues",
"SomeList":["val1","val2"]
}
}
Here is my relevant code:
Object obj = parser.parse(new FileReader("exampleJson.json"));
JSONObject jsonObject = (JSONObject) obj;
JSONObject user = (JSONObject) jsonObject.get("user");
JSONArray list = (JSONArray) user.get("SomeList");
Then my program goes off an gets the values form the keys etc. Or it would but I get a NullPointerException from eclipse. Why is this?
It should unpackage my .json file into jsonObject, unpackage the "user" key as a JSONObject user, then unpackage the "SomeList" key as a JSONArray called list. Except when it does so it must be trying to put one of val1 or val2 into a part of the JSONArray that does not exist and just points into the abyss of null. What have I done to deserve this wrong ?
How do I fix my program?

Your code is working well for me
public class App {
public static void main(final String[] args) throws FileNotFoundException, IOException, ParseException {
final Object obj = new JSONParser().parse(new FileReader("D:/a.json"));
final JSONObject jsonObject = (JSONObject) obj;
final JSONObject user = (JSONObject) jsonObject.get("user");
final JSONArray list = (JSONArray) user.get("SomeList");
System.out.println(list);
}
}
File D:/exampleJson.json
{"user":{
"SomeKeys":"SomeValues",
"SomeList":["val1","val2"]
}
}
output is
["val1","val2"]

Using the exact same json file:
{"user":{
"SomeKeys":"SomeValues",
"SomeList":["val1","val2"]
}
}
Here is the code I use (with the imports to really make sure we have the same ones):
import java.io.FileReader;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
public class Test {
public static void main(String[] args) throws Exception {
Object obj = new JSONParser().parse(new FileReader("t.json"));
JSONObject jsonObject = (JSONObject) obj;
JSONObject user = (JSONObject) jsonObject.get("user");
JSONArray list = (JSONArray) user.get("SomeList");
System.out.println(list);
}
}
And here is the output:
["val1","val2"]
I used maven and m2e to import the library. The version used for this test was json-simple-1.1.jar.