没有db或filesystem的java公共存储选项

Question

I am designing a banking web application where i want to store some common data shared among users/sessions. I want to persist the data but don't have any options for using database or file system. Requirement is whenever common data is modified it should be visible to all instantaneously.I would appreciate some suggestions.

Answer 1

Try to use POJO . Then store all your POJO in a List or a Map.

eg

//this is your pojo
public class User{
     private String name;
     private int age;

     public void setName(String name){
           this.name = name;
     }

     public String getName(){
           return this.name;
     }

     public void setAge(int age){
           this.age = age;
     }

     public int getAge(){
           return this.age;
     }
}


public class TestUser{

     public static void main(String args[]){
           //to populate record, create object user
           User user1 = new User();
           user1.setName = "name1";
           user1.setAge = "20";//then so on

           //after creating object, store it in a <a href="http://tutorials.jenkov.com/java-collections/index.html"collection</a>. Depends on what you want.
           List<User> myList = new ArrayList<User>();
           //then add it to your collection
           myList.add(user1); //and so on
           //you can access now your record on your list
     }
}

Answer 2

您可以使用hsql db jdbc驱动程序，该驱动程序支持为内存数据库支持创建内存数据库checkout hsql db文档

Answer 3

I would suggest you to use Caches (Oracle Coherence , simple Map) there are many option available. If you want to persist the data for permanently then i don't thing any other option than Database/Filesystem .

Caching

• Ehcache
• Oracle Coherence
• JCS

Answer 4

You can use cache like Memcached.

or you can use in-memory database like HSqlDB.