A reflection based Object binder for java.util.Properties?

I would like to automatically bind properties from a java.util.Properties instance to the fields in an object.

Preferable something like this:

Properties props = ... // has for instance the property "url=http://localhost:8080
MyType myType = ...
PropertiesBinder.bind(props,开发者_如何学Go myType);
assertEquals("http://localhost:8080", myType.getUrl());

It is not that hard to roll your own, but i wonder if someone already has done this?

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BeanUtils.populate(object, map)

Properties extends Hashtable implements Map, so you can use it in the above method.

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If you just want to set String values, this will do (you do not need a third party library):

public static void bind(Properties props, Object obj) throws Exception {
    Field field;
    Class<?> cLass = obj.getClass();
    for (String prop : props.stringPropertyNames()) {
        try {
            field = cLass.getDeclaredField(prop);
            if (field.getType().equals(String.class)) {
                if (!field.isAccessible())
                    field.setAccessible(true);
                field.set(obj, props.get(prop));
            }
        } catch (NoSuchFieldException e) {
            System.err.println("no luck");
        }
    }
}

For advanced things, I'd suggest the preferences API, guice, spring, pico container, or a tool that I maintain by name InPUT.

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If you are doing configuration type things, take a look at config-magic which allows you to use annotations to map configuration properties to bean getters.

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Property Binder: http://pholser.github.com/property-binder