這是一個接口實現方法

package com.itheima.aop;public class Target implements TargetInterface{public void save() {System.out.println("save running.....");} }

這是定義的接口

package com.itheima.aop;public interface TargetInterface {public void save(); }

用Spring集合junit進行測試：

@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class AopTest {@Autowiredprivate Target target;@Testpublic void test1() {target.save();} }

報錯如下：
Bean named ‘Target’ is expected to be of type ‘com.itheima.aop.Target’ but was actually of type 'com

修改代碼，把target定義為TargetInterface，不報錯：

@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class AopTest {@Autowiredprivate TargetInterface target;@Testpublic void test1() {target.save();} }

總結

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