为什么不用ResourceBundle,而要自己写呢???
import java.util.*;
 public dbcon(boolean fromres) {
    if (true == fromres) {
      try {
        ResourceBundle res;
        res = ResourceBundle.getBundle("dbconfig");
        this.setDbDriver(res.getString("DRIVER"));
        this.setDbURL(res.getString("DSN"));
        this.setDbUsername(res.getString("USERID"));
        this.setDbPassword(res.getString("PASSWORD"));
      }
      catch (Exception e) {
        System.out.println("Error:ResFileNotFound!");
        return;
      }
    }
  }dbconfig.properties的内容:
dbDriver=oracle.jdbc.driver.OracleDriver
dbURL=jdbc:oracle:thin:@192.168.9.1:1521:test
dbUsername=user
dbPassword=12345