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

时间：2015-05-18 16:29:12 收藏：0 阅读：175

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);

}

原文：http://www.cnblogs.com/happyxiaomo/p/4512106.html

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