Java 知识 - 接口代理
介绍模仿 Mybatis 的接口代理，自己模仿写一下。
接口
public interface MyInterface {
public List<String> getString(String a, String b);
}代理(未做到通用)
public class MyProxy implements InvocationHandler {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Select annotation = method.getAnnotation(Select.class);
if(annotation != null) {
System.out.println("SQL：" + annotation.value());
}
// 模拟数据库查询 SQL 操作
ArrayList list = new ArrayList();
list.add(args);
list.add(args);
return list;
}
}代理工厂
public class ProxyFactory {
public Object getProxyInstance(Class mapper){
ClassLoader classLoader = ProxyFactory.class.getClassLoader();
return Proxy.newProxyInstance(classLoader,new Class[] { mapper }, new MyProxy());
}
}测试
public class Mytest {
public static void main(String[] args) {
ProxyFactory proxyFactory = new ProxyFactory();
MyInterface myInterface = (MyInterface) proxyFactory.getProxyInstance(MyInterface.class);
List<String> string = myInterface.getString("fei", "gege");
System.out.println(string.toString());
}
}结果：
SQL：select * from users where id = ?
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