Merge JSON files - json

Question

Does anybody know the best way to merge 2 JSON files? I am looking to move the 'awardClaimForms' from file 1 to file 2 while keeping the same 'number'. Would consider manual work if it was a few but I'm dealing with just over 1k entries. Any direction or help would be appreciated!
File 1 contains:
{
"Notices": [
{
"awardClaimForms": "form-21",
"number": "2015-031"
},
{
"awardClaimForms": "form22",
"number": "2015-030"
},
]
}
File 2 contains:
{
"Notices": [
{
"number": "2015-031",
"link": "http://www.yahoo.com",
"title": "myother sample title",
"awardClaimDueDate": "March 01, 2013",
"datePosted": "12/01/2012"
},
{
"number": "2015-030",
"link": "http://www.google.com",
"title": "my sample title",
"awardClaimDueDate": "March 01, 2013",
"datePosted": "12/01/2012"
},
]
}
Desired Outcome:
{
"Notices": [
{
"number": "2015-031",
"link": "http://www.yahoo.com",
"title": "myother sample title",
"awardClaimDueDate": "March 01, 2013",
"awardClaimForms": "form-21",
"datePosted": "12/01/2012"
},
{
"number": "2015-030",
"link": "http://www.google.com",
"title": "my sample title",
"awardClaimDueDate": "March 01, 2013",
"awardClaimForms": "form-22",
"datePosted": "12/01/2012"
},
]
}

Answer 1

import org.apache.commons.io.IOUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class JsonMerge {
public static void main(String[] args) throws IOException, JSONException {
// Read the json from the files
FileInputStream fileOne = new FileInputStream(new File("D:\\jsonOne.json"));
FileInputStream fileTwo = new FileInputStream(new File("D:\\jsonTwo.json"));
String stringOne = null, stringTwo = null;
try {
stringOne = IOUtils.toString(fileOne);
stringTwo = IOUtils.toString(fileTwo);
} finally {
fileOne.close();
fileTwo.close();
}
// Convert them into json objects
JSONObject jsonOne = new JSONObject(stringOne);
JSONObject jsonTwo = new JSONObject(stringTwo);
// Extract the arrays from the Notices Array
JSONArray jsonOneNoticesArray = jsonOne.getJSONArray("Notices");
JSONArray jsonTwoNoticesArray = jsonTwo.getJSONArray("Notices");
JSONObject mergedJsonArray = new JSONObject();
// Iterate and compare the required condition
for (int i = 0; i < jsonOneNoticesArray.length(); i++) {
for (int j = 0; j < jsonTwoNoticesArray.length(); j++) {
JSONObject mergedJson = new JSONObject();
if (jsonOneNoticesArray.getJSONObject(i).getString("number").equals(jsonTwoNoticesArray.getJSONObject(j).getString("number"))) {
mergedJson.accumulate("number", jsonOneNoticesArray.getJSONObject(i).getString("number"));
mergedJson.accumulate("link", jsonOneNoticesArray.getJSONObject(i).getString("link"));
mergedJson.accumulate("title", jsonOneNoticesArray.getJSONObject(i).getString("title"));
mergedJson.accumulate("awardClaimDueDate", jsonOneNoticesArray.getJSONObject(i).getString("awardClaimDueDate"));
mergedJson.accumulate("datePosted", jsonOneNoticesArray.getJSONObject(i).getString("datePosted"));
mergedJson.accumulate("awardClaimForms", jsonTwoNoticesArray.getJSONObject(j).getString("awardClaimForms"));
mergedJsonArray.append("Notices", mergedJson);
break;
}
}
}
System.out.println("Done merging.. " + mergedJsonArray);
}
}
Adding the below line (instead of System.out.println line) could write the output to the file
FileUtils.write(new File("D:\\mergedJson.json"), mergedJsonArray.toString());
and here is the output of the mergedJsonArray from the above code.