java - 静电的正确使用

Question

目前我正在使用 mongodb 和 java。我不想每次都重新打开与数据存储的连接，所以我想我应该创建一个静态变量:

package Config;

import java.net.UnknownHostException;

import com.google.code.morphia.*;

import com.mongodb.Mongo;
import com.mongodb.MongoException;

public class Config {

    static String dbUrl = "url";
    static int dbPort = portnumber;
    static String username = "user";
    static String password = "pw";
    static String dbName = "dbname";
    public static Datastore ds;

    public static Datastore getDatastore() throws UnknownHostException,
            MongoException {
        if (ds == null) {
            ds = connect();
        }
        return ds;
    }

    public static Datastore connect() throws UnknownHostException,
            MongoException {
        Mongo m = new Mongo(dbUrl, dbPort);
        Datastore ds = new Morphia().createDatastore(m, dbName);
        boolean con = ds.getDB().authenticate(username, password.toCharArray());// todo
        return ds;
    }
}

我会这样使用它:

Config.getDatastore().doSomthing();

除了那些未处理的异常之外，这是使用静态变量的正确方法吗？

Answer 1

最好将 Config 类设置为 singleton 。