========
静态工厂
========

实例工厂：创建复杂对象的方法是一个基于实例的普通方法。

静态工厂：创建复杂对象的方法是一个基于类的静态方法。

/src/main/java/cn/tedu/injection/StaticConnectionFactory.java：

public class StaticConnectionFactory {
    public static Connection getConnection() {
        Connection conn = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/springdb?useSSL=false",
                "root", "123456");
        }
        catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }

        return conn;
    }
}

/src/main/resources/applicationContext.xml：

<bean id="conn" class="cn.tedu.injection.StaticConnectionFactory"
      factory-method="getConnection"/>

             _______________________________________                                     __________
            |                                       v                                   |          |
<bean id="conn" class="cn.tedu.injection.StaticConnectionFactory" factory-method="getConnection"/> |
            ^                                       |___________________________________^          |
 ___________|   ___________________________________________________________________________________|
|              v
| Connection conn = applicationContext.getBean(
|     "conn", Connection.class);
|________|

例程：Injection