dbconfig.java.svn-base

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package org.derrick.jdbc;

import java.io.IOException;
import java.util.Properties;

import org.apache.log4j.Logger;
/**
 * 
 * @author 刘冬宝Oct 26, 2006
   版权申明：所有人员均可自由修改源码并再发布，但必须保留此相关信息
 *
 */
public class DBConfig {

    private static DBConfig dbConfig = null;

    private final static String DEFAULT_DBCONFIG_FILE = "db.config";

    private final static String DB_CON_DRIVER = "driver";

    private final static String DB_CON_URL = "url";

    private final static String DB_CON_USERNAME = "username";

    private final static String DB_CON_PASSWORD = "password";

    private static Logger logger = Logger.getLogger(DBConfig.class);

    private Properties conProperties = new Properties();

    private String dbConfigFile = DEFAULT_DBCONFIG_FILE;

    private DBConfig() {
        load();
    }

    private void load() {
        try {
            conProperties.load(Thread.currentThread().getContextClassLoader()
                    .getResourceAsStream(dbConfigFile));
        } catch (IOException e) {
            logger.fatal("不能从类路径(CLASSPATH)加载数据库配置文件:" + dbConfigFile);
        }
    }

    public static DBConfig getInstance() {
        if (dbConfig == null) {
            synchronized (DBConfig.class) {
                if (dbConfig == null) {
                    dbConfig = new DBConfig();
                }
            }
        }
        return dbConfig;
    }

    public String getURL() {
        return conProperties.getProperty(DB_CON_URL);
    }

    public String getDriver() {
        return conProperties.getProperty(DB_CON_DRIVER);
    }

    public String getUsername() {
        return conProperties.getProperty(DB_CON_USERNAME);
    }

    public String getPassword() {
        return conProperties.getProperty(DB_CON_PASSWORD);
    }

    public static void main(String args[]) {
        DBConfig.getInstance();
    }

    public void setDbConfigFile(String dbconfig_file) {
        dbConfigFile = dbconfig_file;
        load();
    }
}