Java Map的持久化存储：MapDB
jopen
12年前
MapDB 提供了并发的 TreeMap 和 HashMap ，使用基于磁盘的存储。快速、可伸缩性以及易用。
示例代码：
import org.mapdb.*; // configure and open database using builder pattern. // all options are available with code auto-completion. DB db = DBMaker.newFileDB(new File("testdb")) .closeOnJvmShutdown() .encryptionEnable("password") .make(); // open existing an collection (or create new) ConcurrentNavigableMap<Integer,String> map = db.getTreeMap("collectionName"); map.put(1, "one"); map.put(2, "two"); // map.keySet() is now [1,2] db.commit(); //persist changes into disk map.put(3, "three"); // map.keySet() is now [1,2,3] db.rollback(); //revert recent changes // map.keySet() is now [1,2] db.close();