Copy partial attributes between two classes in Java

Beanutils. copyproperties (to, from); all attributes copy is similar to overwrite

Private Static void copyproperties (Object O1, object O2 ){

String filename, STR, getname, setname;
List fields = new arraylist ();
Method getmethod = NULL;
Method setmethod = NULL;
Try {
Class C1 = o1.getclass ();
Class C2 = o2.getclass ();

Field [] fs1 = c1.getdeclaredfields ();
Field [] fs2 = c2.getdeclaredfields ();
// Two class attributes are excluded from the comparison and only the same attributes are left.
For (INT I = 0; I <fs2.length; I ++ ){
For (Int J = 0; j <fs1.length; j ++ ){
If (fs1 [J]. getname (). Equals (fs2 [I]. getname ())){
Fields. Add (fs1 [J]);
Break;
}
}
}
If (null! = Fields & fields. Size ()> 0 ){
For (INT I = 0; I <fields. Size (); I ++ ){
// Get the property name
Field F = (field) fields. Get (I );
Filename = f. getname ();
// The first letter of the attribute name is capitalized.
STR = filename. substring (0, 1). touppercase ();
// Concatenate the getxxx and setxxx method names
Getname = "get" + STR + filename. substring (1 );
Setname = "set" + STR + filename. substring (1 );
// Get and set methods
Getmethod = c1.getmethod (getname, new class [] {});
Setmethod = c2.getmethod (setname, new class [] {f. GetType ()});

// Obtain the property value
Object o = getmethod. Invoke (O1, new object [] {});
System. Out. println (filename + ":" + O );
// Put the property value into the corresponding property of another object
If (null! = O ){

System. Out. println ("o2.setmethod =" + setmethod );

Setmethod. Invoke (O2, new object [] {o });
}
}
}
} Catch (securityexception e ){
E. printstacktrace ();
} Catch (nosuchmethodexception e ){
E. printstacktrace ();
} Catch (illegalargumentexception e ){
E. printstacktrace ();
} Catch (illegalaccessexception e ){
E. printstacktrace ();
} Catch (invocationtargetexception e ){
E. printstacktrace ();
}
}