How to convert collection to JSON array using JSON-lib API in Java?-javaTutorial-php.cn

How to convert collection to JSON array using JSON-lib API in Java?

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Release： 2023-08-20 19:09:04

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如何使用Java中的JSON-lib API将集合转换为JSON数组？

net.sf.json.JSONArray is an ordered sequence of values. Its outer text form is a string enclosed in square brackets with values separated by commas, and its inner form is an object with get() and opt( ) method, and the element() method that adds or replaces a value. These values can be any of Boolean, JSONArray, JSONObject, Number, String and JSONNull objects.

We can convert a collection (List) to a JSON array as shown in the following example

Example

import java.util.*;
import net.sf.json.JSONArray;
import net.sf.json.JSONSerializer;
public class ConvertCollectionToJsonArrayTest {
   public static void main(String[] args) {
      List<String> strList = Arrays.asList("India", "Australia", "England", "South Africa");
      JSONArray jsonArray = (JSONArray)JSONSerializer.toJSON(strList);
      System.out.println(jsonArray.toString(3)); //pretty print JSON
      List<Object><object> objList = new ArrayList<Object><object>();
      objList.add("List Data");
      objList.add(new Integer(50));
      objList.add(new Long(99));
      objList.add(new Double(50.65));
      objList.add(true);
      objList.add(new char[] {&#39;X&#39;, &#39;Y&#39;, &#39;Z&#39;});
      jsonArray = (JSONArray)JSONSerializer.toJSON(objList);
      System.out.println(jsonArray.toString(3)); //pretty print JSON
   }
}
</object></object>

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Output

[
   "India",
   "Australia",
   "England",
   "South Africa"
]
[
   "List Data",
   50,
   99,
   50.65,
   true,
      [
      "X",
      "Y",
      "Z"
   ]
]

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