@Override
        public boolean equals(Object o) {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }
            URLDefinition that = (URLDefinition) o;
            return uri != null ? uri.equals(that.uri) : that.uri == null;
        }
@author Robert HG (254963746@qq.com)on 12/23/15.
lts-core/src/main/java/com/github/ltsopensource/core/spi/ServiceLoader.java