I would store my object inside the .jar
using java preferences
.
I convert my object into a String and i store it.
I use this code to save it:
Preferences.userNodeForPackage(Centrale.class).put("myValue", myString);
I use this code to read it:
String myString = "";
myString = prefs.get("myValue", myString);
I find an error when i save a big string. The error is:
java.lang.IllegalArgumentException: Value too long
java.util.prefs.AbstractPreferences.put(AbstractPreferences.java:245)
How can i solve it?
You would need to break the String into length of Preference.MAX_VALUE_LENGTH. I would suggest that you create myValue.1, myValue.2, etc... That are related to myValue. When loaded you just string the values together.
Here is some code:
String value = "....";
int size = value.length();
if (size > Preference.MAX_VALUE_LENGTH) {
cnt = 1;
for(int idx = 0 ; idx < size ; cnt++) {
if ((size - idx) > Preference.MAX_VALUE_LENGTH) {
pref.put(key + "." + cnt, value.substring(idx,idx+Preference.MAX_VALUE_LENGTH);
idx += Preference.MAX_VALUE_LENGTH;
} else {
pref.put(key + "." + cnt, value.substring(idx);
idx = size;
}
}
} else {
pref.put(key, value);
}
There is also a limit on the key size which is Preference.MAX_KEY_LENGTH.
One more point to make is that you can then use the Preference keys method to recreate your object.