servicelocator.java

这是一本描述JDBC数据库的书籍

/*
 * ServiceLocator.java
 *
 * Created on June 11, 2005, 11:21 AM
 *
 * To change this template, choose Tools | Options and locate the template under
 * the Source Creation and Management node. Right-click the template and choose
 * Open. You can then make changes to the template in the Source Editor.
 */

package ch02.locator;
import ch02.manager.EmployeeDAO;
import java.io.*;
import java.util.*;
/**
 *
 * @author kevin
 */
public class ServiceLocator {
    public static final String EMPLOYEE_SERVICE="employee_dao_service";
    private static String employeeService = null;
    /** Creates a new instance of ServiceLocator */
    private ServiceLocator() {
        InputStream is = getClass().getResourceAsStream("services.properties");
        try{
            Properties props = new Properties();
            props.load(is);
            employeeService = props.getProperty(EMPLOYEE_SERVICE);
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    
    public static EmployeeDAO getEmployeeDAO()throws Exception{
        new ServiceLocator();
        return (EmployeeDAO)Class.forName(employeeService).newInstance();
    }
}