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java 代理模式
java 注解
java 代理模式
代理模式的定义：为一个对象（实例)找一个或多个替身或占位符，通过操作这些替身或占位符，来对这个对象进行控制
代理模式用来创建代表对象，通过控制代表对象达到控制真实对象的目的，比如如果想对真实对象进行安全性的补充，可以不修改真实对象，创建一个安全代表对象，对这个安全代表对象无论怎么改都不会影响到真实对象的代码。
代表对象本质还是去调用真实对象，只是一些特有的东西全部写在代表对象里，代表对象对数据进行一系列处理后再调用真实对象。
几种代理控制访问的方式：
1.远程代理控制访问远程对象
2.虚拟代理控制访问创建开销大的资源
3.保护代理基于权限控制对资源的访问
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