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为电商平台提供一个抽象层，隐藏平台的实现细节。 允许平台在不影响底层实现的情况下进行扩展和修改。 组件： IPlatform： 定义电商平台的基本接口，包括浏览商品、下单和处理支付等功能。 ConcretePlatform： 实现IPlatform接口的具体电商平台，例如亚马逊、淘宝等。 ProxyPlatform： 业务伙伴电商平台，实现IPlatform接口，并封装ConcretePlatform的实现。 设计原则： 抽象耦合： ProxyPlatform与ConcretePlatform之间通过IPlatform接口进行耦合，将平台的具体实现隐藏起来。 开放/封闭原则： ProxyPlatform对扩展开放，对修改封闭。新的电商平台可以通过实现ConcretePlatform接口进行添加，而无需修改ProxyPlatform。 单一职责原则： ProxyPlatform负责业务伙伴电商平台的接口，而ConcretePlatform负责实际的实现。 实现： ProxyPlatform类遵循以下步骤： 初始化： 创建一个ConcretePlatform实例，并将其封装在业务伙伴类中。 转发调用： 当调用ProxyPlatform的方法时，合作伙伴类将调用转发给封装的ConcretePlatform实例。 处理结果： 业务伙伴类可能会对从ConcretePlatform返回的结果进行处理，例如添加额外的功能或检查错误。 优点： 灵活性： 合作伙伴模式允许电商平台在不影响协同伙伴类的情况下进行修改和扩展。 可测试性： 合作伙伴类可以隔离具体平台的实现，使其更容易进行测试。 维护性： 业务伙伴模式有助于减少代码重复，提高维护性。 示例： ```j影音a // IPlatform 接口 interface IPlatform { List getProducts(); Order placeOrder(Order order); Payment processPayment(Payment payment); } // ConcretePlatform 类 class AmazonPlatform implements IPlatform { // ... } // ProxyPlatform 类 class ProxyPlatform implements IPlatform { private ConcretePlatform platform; public ProxyPlatform(ConcretePlatform platform) { this.platform = platform; } @Override public List getProducts() { return platform.getProducts(); } @Override public Order placeOrder(Order order) { // 额外步骤，例如验证订单或添加优惠 // ... return platform.placeOrder(order); } @Override public Payment processPayment(Payment payment) { return platform.processPayment(payment); } } // 用法 ProxyPlatform proxyPlatform = new ProxyPlatform(new AmazonPlatform()); List products = proxyPlatform.getProducts(); Order order = proxyPlatform.placeOrder(order); Payment payment = proxyPlatform.processPayment(payment); ```多云Android TV/tvOS生态赋能接口安全测试采购攻略