I am new to JSON programming in J2ME.
I discovered that Json is used to exchange data much like XML.
I want to know about the exchange in Array object from JSONtoObject and vice versa
Below written is code where I convert from JSON to Object and vice versa.
But I don’t know about how to do for complex data structure like arrays etc.
// App Loader
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
public class AppLoader extends MIDlet {
public AppLoader() {
// TODO Auto-generated constructor stub
// Converting Object to JSON
UserData data=new UserData();
data.setId(10);
data.setName("Yatin");
data.setDescription("Testing JSON in J2ME");
System.out.println("Convert to JSON"+data.toJSON());
//Convert JSON to Object
String sample="{\"id\":99,\"name\":\"Tester\",\"description\":\"This is JSON Data\"}";
UserData data2=new UserData();
data2.fromJSON(sample);
System.out.println("Convert from JSON "+data2);
}
protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
// TODO Auto-generated method stub
}
protected void pauseApp() {
// TODO Auto-generated method stub
}
protected void startApp() throws MIDletStateChangeException {
// TODO Auto-generated method stub
}
}
In this class I created getters and setters for the String type of objects and then created JsonObject to create a JSON object to create a JSON object and then vice versa as per functions toJSON() and fromJSON()
// User Data class
import org.json.me.JSONException;
import org.json.me.JSONObject;
public class UserData {
private int id;
private String name;
private String description;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String toString()
{
return getId()+"-"+getName()+"-"+getDescription();
}
public String toJSON() {
// TODO Auto-generated method stub
JSONObject inner=new JSONObject();
try {
inner.put("id",getId());
inner.put("description", getDescription());
inner.put("name", getName());
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return inner.toString();
}
public void fromJSON(String jsonString) {
// TODO Auto-generated method stub
try {
JSONObject json=new JSONObject(jsonString);
setId(json.getInt("id"));
setDescription(json.getString("description"));
setName(json.getString("name"));
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
i found a better link for this question
http://jimmod.com/blog/2011/09/java-me-j2me-json-implementation-for-array-object/
Check this link for different JSON Data Set Sample
One Example for your Understanding::: JSON String Nested with Arrays
To check its valid or not check this link (JSON Validator)
To check JSON Viewer
So Here is code take look::
You can use your same concept to set & get data like above you did. complex data structure always easy to handle in JSON, don’t worry about it. Thanks