package exercise.xml;
import net.sf.json.JSON;
import net.sf.json.JSONSerializer;
import net.sf.json.xml.XMLSerializer;
import org.jdom.Document;
public class XmlExercise {
  /**
   * 将xml字符串转换为JSON字符串
   *
   * @param xmlString
   *      xml字符串
   * @return JSON对象
   */
  public static String xml2json(String xmlString) {
    XMLSerializer xmlSerializer = new XMLSerializer();
    JSON json = xmlSerializer.read(xmlString);
    return json.toString(1);
  }
  /**
   * 将xmlDocument转换为JSON对象
   *
   * @param xmlDocument
   *      XML Document
   * @return JSON对象
   */
  public static String xml2json(Document xmlDocument) {
    return xml2json(xmlDocument.toString());
  }
  /**
   * JSON(数组)字符串转换成XML字符串
   *
   * @param jsonString
   * @return
   */
  public static String json2xml(String jsonString) {
    XMLSerializer xmlSerializer = new XMLSerializer();
    return xmlSerializer.write(JSONSerializer.toJSON(jsonString));
    // return xmlSerializer.write(JSONArray.fromObject(jsonString));//这种方式只支持JSON数组
  }
}

package exercise.xml;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class XmlTest extends XmlExercise {
  public static void main(String[] args) {
    JSONObject jsonObject = new JSONObject();
    jsonObject.put("username", "horizon");
    JSONArray jsonArray = new JSONArray();
    JSONObject dataJson = new JSONObject();
    jsonArray.add(jsonObject);
    //jsonArray.add(jsonObject);
    dataJson.put("data", jsonArray);
    System.out.println(dataJson.toString());
    String xml = json2xml(dataJson.toString());
    System.out.println("xml:" + xml);
    String str = xml2json(xml);
    System.out.println("to_json" + str);
  }
}