例項

/**
 * 靜態工廠
 * @date 2020.04.01
 */
public class ExternalBeanStaticFactory {
    private static OkHttpClient OkHttpClient;
    public static OkHttpClient getInstance() {
        if (OkHttpClient == null) {
            OkHttpClient = new OkHttpClient.Builder().build();
        }
        return OkHttpClient;
    }
}
 

/**
 * 動態工廠
 * @author cxy
 * @date 2020.04.01
 */
public class ExternalBeanFactory {
    private OkHttpClient OkHttpClient;
    public OkHttpClient getInstance() {
        if (OkHttpClient == null) {
            OkHttpClient = new OkHttpClient.Builder().build();
        }
        return OkHttpClient;
    }
}
 

<!-- 靜態工廠 -->
<bean class="net.web.ExternalBeanStaticFactory" factory-method="getInstance" id="okHttpClientStatic"></bean>

<!-- 動態工廠 -->
<bean class="net.web.ExternalBeanFactory" id="ExternalBeanFactory"/>
<bean class="okhttp3.OkHttpClient" factory-bean="ExternalBeanFactory
 
" factory-method="getInstance" id="okHttpClient"></bean>

可以看到，靜態工廠的方法多了 static 關鍵字，而動態工廠就對了個bean 配置，看到這裡我們來總結一下：

• 邏輯程式碼和配置方式的區別（這也是CSDN看到最多的關於這兩者的解釋）
• 動態工廠需要更多的記憶體（達到一定的併發）