根据类名，获取接口对象

小灰灰 2022-07-14 15:21 237阅读 0赞

public static CommonInterface getCommonInterface(Interface itf) throws ClassNotFoundException, InstantiationException, IllegalAccessException{
      Class c = Class.forName(itf.getClassName());
      CommonInterface commonInterface = (CommonInterface) c.newInstance();
      InterfaceInvocationHandler ih = new InterfaceInvocationHandler(commonInterface);
      CommonInterface ci = (CommonInterface)Proxy.newProxyInstance(c.getClassLoader(), c.getInterfaces(), ih); 
      return ci;
     }

根据类的全名，来获取响应的接口

其中itf.getClassName()=="com.xx.interface.impl.JlinterfaceImpl" ，JlinterfaceImpl该类是实现了CommonInterface 接口，

最后通过代理Proxy.newProxyInstance方法获取相应的接口

public class InterfaceInvocationHandler implements InvocationHandler{
    
    	private static final Logger log = LogManager.getLogger(InterfaceInvocationHandler.class);
    	
    	private Object interfaceObj;
    	
    	/**
    	 * 构造函数
    	 * @param interfaceObj
    	 */
    	public InterfaceInvocationHandler(Object interfaceObj) {
    		this.interfaceObj = interfaceObj;
    	}
    	
    	/**
    	 * 实现接口方法
    	 * @param proxy     
    	 * @param method    被代理的类的方法名
    	 * @param args      被代理的类方法里的参数
    	 */
    	@Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    		Object result = null;
    		try {
    			//通过反射执行代理类的方法  
    			result = method.invoke(this.interfaceObj, args);
    		} catch (Exception e) {
    			log.error("动态代理执行类方法出现异常!");
    			ExceptionPrintUtil.PrintErrorMessage(e, log);
    		}
    		return result;
    	}
    }