如何为CXF中的字符串提供自定义MessageBodyWriter

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

@Provider
public class CustomStringMessageBodyWriter implements MessageBodyWriter<String> {

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type == String.class;
    }

    @Override
    public long getSize(String s, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return s.getBytes().length;
    }

    @Override
    public void writeTo(String s, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
                        MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException {
        entityStream.write(s.getBytes());
    }
}

<jaxrs:providers>
    <bean class="com.example.CustomStringMessageBodyWriter"/>
</jaxrs:providers>