public class Bean { public static final String dbtype=new String();}public static void changFinalProperty(Class clazz ,Object newvalue) { try { Object o = clazz.newInstance(); Field field = clazz.getDeclaredField("dbtype"); field.setAccessible(true); Field modifiersField = Field.class.getDeclaredField("modifiers"); modifiersField.setAccessible(true); modifiersField.set(field, field.getModifiers() & ~Modifier.FINAL); field.set(null, newvalue); } catch (NoSuchFieldException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println(Bean.dbtype); } 反射的更改 更改 static final 静态常量的值 。 这样就能动态的更改 决定spring 用那一套实现
原文：http://www.cnblogs.com/happyxiaomo/p/4512106.html