JAVA JSON to XML String in Ordering

JAVA JSON to XML String in Ordering

In my friend’s project, he requires to convert JSON to XML.
He is using an open source project called JSON-java which is using HashMap in side the implementation which does not support ordering.
So the output XML ordering will be not the same as in JSON.
Here is the way to make it working. pom.xml in Spring-Boot Release
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
</dependency>
Here is the Jackson to help to keep the ordering.
package com.sillycat.utils;
import java.io.IOException;
import java.util.Iterator;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.XML;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JSONHelper {
public static void main(String[] args) throws JsonProcessingException, IOException {
String jsonInString = "{\"name\" : \"yiyi\", \"book\": \"java\", \"lan\": \"pdf\" }";
ObjectMapper mapper = new ObjectMapper();
JsonNode jackson = mapper.readTree(jsonInString);
System.out.println("jackson:" + jackson);

String xml = XML.toString(new JSONAdapter(jackson));
System.out.println("XML:" + xml);
}
private static class JSONAdapter extends JSONObject {
private JsonNode jackson;
public JSONAdapter(JsonNode jackson) {
this.jackson = jackson;
}
@Override
public Iterator<String> keys() {
return jackson.fieldNames();
}
@Override
public Object opt(String key) {
return get(key);
}
@Override
public Object get(String key) throws JSONException {
JsonNode nested = jackson.get(key);
if (nested.isObject()) {
return new JSONAdapter(nested);
} else if (nested.isTextual()) {
return nested.asText();
} else if (nested.isNumber()) {
return nested.asDouble();
} else if (nested.isBoolean()) {
return nested.asBoolean();
}
return null;
}
}
}
Since the version of the package is controlled by the Spring Boot Parent Project, we may need this to covert the JSONArray to Java ArrayList
package com.sillycat.utils;
import java.util.ArrayList;
import java.util.Collection;
import org.json.JSONArray;
import org.json.JSONException;
public class ArrayUtil {
public static ArrayList<Object> convert(JSONArray jArr) {
ArrayList<Object> list = new ArrayList<Object>();
try {
for (int i = 0, l = jArr.length(); i < l; i++) {
list.add(jArr.get(i));
}
} catch (JSONException e) {
}
return list;
}
public static JSONArray convert(Collection<Object> list) {
return new JSONArray(list);
}
}
But it is not as good as the indexPosition solutions like the CSV Package.
References:
https://stackoverflow.com/questions/17037340/converting-jsonarray-to-arraylist/17037364
https://stackoverflow.com/questions/42787333/json-to-xml-conversion-without-changing-the-sequence
https://github.com/stleary/JSON-java