public List<String> findAddressesByApplication(String application) {
    List<String> ret = new ArrayList<String>();
    ConcurrentMap<String, Map<Long, URL>> consumerUrls = getRegistryCache().get(Constants.CONSUMERS_CATEGORY);
    if(consumerUrls == null) return ret;

    for(Map.Entry<String, Map<Long, URL>> e1 : consumerUrls.entrySet()) {
        Map<Long, URL> value = e1.getValue();
        for(Map.Entry<Long, URL> e2 : value.entrySet()) {
            URL u = e2.getValue();
            if(application.equals(u.getParameter(Constants.APPLICATION_KEY))) {
                String addr = u.getAddress();
                if(addr != null) ret.add(addr);
            }
        }
    }

    return ret;
}

原文：http://www.codingdict.com/sources/java/java.util/5364.html