杂记: 默认使用return @ResonseBody
    1,aop
    暂时只介绍注解模式的aop，日志案例
    第一种 

    2. @Aspect
    3. public class Log {
    4.     //在方法里指定调用位置，然后execution指定具体执行哪个方法时候执行
    5.     @Before("execution(* com.xkcoding.properties.dao.UserServiceImp.getUser(..))")
    6.     public void before(){
    7.         System.out.println("-----方法执行前------");
    8.     }
    9. }
    1. <?xml version="1.0" encoding="UTF-8"?>
    2. <beans xmlns="http://www.springframework.org/schema/beans"
    3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
    4.        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    5.   <bean id="userDAOImp" name="userDAOImp" class="com.xkcoding.properties.dao.UserDAOImp"></bean>
    6. <!--  constructor-arg 构造方法来配置资源-->
    7.   <bean id="UserServiceImp" name="userServiceImp" class="com.xkcoding.properties.dao.UserServiceImp" scope="singleton" autowire="byName">
    8. <!--    <property name="userDAO" ref="userDAOImp"></property>-->
    9.   </bean>
    10.   <bean id="Log" class="com.xkcoding.properties.proxy.Log"></bean>
    11.   //自动注入
    12.   <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
    13. </beans>

    第二种
    在beans里面通过xml宏观管理组件的方式

    1.  <aop:config>
    2.     <aop:aspect ref="Log">
    3.          //第一个*是返回值
    4.         <aop:pointcut  id="pointcut" expression="execution(* com.xkcoding.properties.dao.UserServiceImp.getUser(..))"/>
    5.         <aop:before method="before" pointcut-ref="pointcut"/>
    6.     </aop:aspect>
    7.   </aop:config>
    1. 2，mybatis的xml注入，一步步利用容器创建想要的实例<br />![image.png](https://cdn.nlark.com/yuque/0/2020/png/750718/1599722930735-16628fbd-163d-4557-807e-9355146c3911.png#align=left&display=inline&height=383&margin=%5Bobject%20Object%5D&name=image.png&originHeight=383&originWidth=849&size=403634&status=done&style=none&width=849)<br />2, bean的缓存<br />[https://zhuanlan.zhihu.com/p/186212601](https://zhuanlan.zhihu.com/p/186212601)<br />3，bean的注解版使用 [https://www.cnblogs.com/feiyu127/p/7700090.html](https://www.cnblogs.com/feiyu127/p/7700090.html)
    1. @Configuration
    2. public class AppConfig {
    3.     @Bean
    4.     public TransferService transferService() {
    5.         return new TransferServiceImpl();
    6.     }
    7. }

    等同于

    1. <beans>
    2.     <bean id="transferService" class="com.acme.TransferServiceImpl"/>
    3. </beans>

    生命周期PostConstruct详解 https://www.jianshu.com/p/98cf7d8b9ec3
    4，关于controller跳转问题 https://blog.csdn.net/qq_19648309/article/details/65627375