将Java复杂对象转换为Json

package comS309.traxz.data;

import java.util.Collection;

import org.json.JSONException;
import org.json.JSONObject;

public class ExerciseSession {

    public String DateCreated;
    public String TotalTime;
    public String CaloriesBurned;
    public String AvgSpeed;
    public String SessionName;
    public String Distance;
    public String SessionType;
    public String UserId;
    public Collection<LatLon> LatLons;
}

LatLon如下：

public class LatLon {

    public String LatLonId;
    public String Latitude;
    public String Longitude;
    public String ExerciseSessionId;
    public String LLAveSpeed;
    public String Distance;
}

所以Class ExerciseSession有一组LatLon对象.现在我需要将ExerciseSession类从java转换为Json格式并将其发送到我的服务器.

我在Android操作系统上这样做,如果这很重要.

我目前的解决方案是：

JSONObject ExerciseSessionJSOBJ = new JSONObject();
ExerciseSessionJSOBJ.put("DateCreated",this.DateCreated);
            ExerciseSessionJSOBJ.put("TotalTime",this.TotalTime);
            ExerciseSessionJSOBJ.put("CaloriesBurned",this.CaloriesBurned);
            ExerciseSessionJSOBJ.put("AvgSpeed",this.AvgSpeed);
            ExerciseSessionJSOBJ.put("SessionName",this.SessionName);
            ExerciseSessionJSOBJ.put("Distance",this.Distance);
            ExerciseSessionJSOBJ.put("SessionType",this.SessionType);
            ExerciseSessionJSOBJ.put("UserId",this.UserId);
            //add the collection
            for(LatLon l: LatLons)
            {
                ExerciseSessionJSOBJ.accumulate("LatLons",l);
            }

我不确定这是否有效..我是Json的新手,需要帮助.
在此先感谢您的帮助！