<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.3.11</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.3.11</version>
</dependency>

 private UserDao userDao;

//利用set进行动态实现值的注入!!
public void setUserDao(UserDao userDao) {
    this.userDao = userDao;
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="hello" class="org.mecca.pojo.Hello">
        <property name="str" value="Spring"/>
    </bean>
</beans>

package org.mecca.pojo;
public class Hello {
    private String str;
    @Override
    public String toString() {
        return "Hello{" +
                "str='" + str + '\'' +
                '}';
    }

    public String getStr() {
        return str;
    }
    public void setStr(String str) {
        this.str = str;
    }
}

import org.mecca.pojo.Hello;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MyTest {
    public static void main(String[] args) {
        // create and configure beans
        //获取Spring上下文对象
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");

        //我们的对象现在都在Spring中管理了,我们要使用直接在里面取出来就可以了!
        Hello hello = (Hello) context.getBean("hello");
        System.out.println(hello.toString());
    }
}

<alias name="user" alias="userNew"/>

<!--
id: bean的唯一标识符,也相当于对象名
class: bean对象所对应的全限定名: 包名+类型
name:也是别名  name可以取多个别名
-->
<bean id="userT" class="org.mecca.pojo.UserT" name="userT2,U2" >
    <property name="name" value="Spring"/>
</bean>

<import resource="beans.xml"/>
<import resource="bean2.xml"/>
<import resource="bean3.xml"/>

import org.mecca.pojo.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        Student student = (Student) context.getBean("student");
        

        System.out.println(student.toString());
//      Student{name='Aealen',
//      address=Address{address='芜湖'},
//      books=[红楼梦, 西游记, 三国演义, 水浒传],
//      hobbies=[听歌, 看电影, 敲代码],
//      card={身份证=1111111111111111111, 银行卡=123123342342341},
//      games=[LOL, CS, OW, BOB, COC],
//      wife='null',
//      info={学号=19101912, 性别=男, 年级=五年级, 年龄=90}}
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="address" class="org.mecca.pojo.Address">
        <property name="address" value="芜湖"/>
    </bean>

    <bean id="student" class="org.mecca.pojo.Student">
        <!--    普通注入  value`-->
        <property name="name" value="Aealen"/>
        <!--    bean注入 ref-->
        <property name="address" ref="address"/>
        <!--    数组注入  value`-->
        <property name="books">
            <array>
                <value>红楼梦</value>
                <value>西游记</value>
                <value>三国演义</value>
                <value>水浒传</value>
            </array>
        </property>
        <!--    List注入  value`-->
        <property name="hobbies">
            <list>
                <value>听歌</value>
                <value>看电影</value>
                <value>敲代码</value>
            </list>
        </property>
        <!--    Map注入  value`-->
        <property name="card">
            <map>
                <entry key="身份证" value="1111111111111111111"/>
                <entry key="银行卡" value="123123342342341"/>
            </map>
        </property>

        <!--    Set注入  value`-->
        <property name="games">
            <set>
                <value>LOL</value>
                <value>CS</value>
                <value>OW</value>
                <value>BOB</value>
                <value>COC</value>
            </set>
        </property>
        <!--    null -->
        <property name="wife">
            <null/>
        </property>
        <!--    Properties-->
        <property name="info">
            <props>
                <prop key="学号">19101912</prop>
                <prop key="性别">男</prop>
                <prop key="年级">五年级</prop>
                <prop key="年龄">90</prop>
            </props>
        </property>
    </bean>
</beans>

xmlns:p="http://www.springframework.org/schema/p"


<!--p 命名空间注入 可以直接注入属性的值-->
<bean id="user" class="org.mecca.pojo.User" p:name="Aealen" p:age="18"/>

xmlns:c="http://www.springframework.org/schema/c"

<!--c 命名空间注入 可使用构造器注入-->
<bean id="user2" class="org.mecca.pojo.User" c:age="18" c:name="Aealen"/>

<bean id="user2" class="org.mecca.pojo.User" c:age="18" c:name="Aealen" scope="singleton"/>

<bean id="user2" class="org.mecca.pojo.User" c:age="18" c:name="Aealen" scope="prototype"/>

<bean id="cat" class="org.mecca.pojo.Cat"/>
<bean id="dog" class="org.mecca.pojo.Dog"/>
<bean id="human" class="org.mecca.pojo.Human" autowire="byName">
    <property name="name" value="Aealen"/>
</bean>

<bean id="cat22" class="org.mecca.pojo.Cat"/>
<bean id="dog11" class="org.mecca.pojo.Dog"/>
<bean id="human" class="org.mecca.pojo.Human" autowire="byType">
    <property name="name" value="Aealen"/>
</bean>

The introduction of annotation-based configuration raised the question of whether this approach is “better” than XML. The short answer is “it depends.”

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    
    <context:component-scan base-package="org.mecca.pojo"/>
    <context:annotation-config/>

</beans>

 @Component 组件,放在类上,说明这个类被Spring管理了!就是所谓的bean

package org.mecca.pojo;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
//等价于在bean注册了bean
@Component
public class User {
    public String name;
    //相当于<property name="name value="Aealen"/>
    @Value("Aealen")
    public void setName(String name) {
        this.name = name;
    }
}

@Scope("prototype") 

@Configuration  //代表这是个配置类 , 就和之前的beans.xml是一样的
@Import(NewConfig.class) //可以导入配置类

//注册一个bean就相当于我们之前写的一个bean 标签
//这个方法的名字就相当于 bean 标签中的id 属性
//这个方法的返回值就相当于Bean标签中的class属性
@Bean
public User getUser(){
    return new User();//返回要注入bean的对象
}

//如果完全使用了配置类方式去实现,我们只能通过AnnotationConfig 上下文来获取容器,通过配置类的class对象加载!
ApplicationContext context = new AnnotationConfigApplicationContext(MyConfig.class);

package org.mecca.client.demo04;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
//我们会用这个类自动生成代理
public class ProxyInvocationHandle implements InvocationHandler {
    //被代理的接口
    private Object target;
    public void  setTarget(Object target){
        this.target=target;
    }
    //生成得到代理类
    public Object getProxy(){
        return Proxy.newProxyInstance(this.getClass().getClassLoader(), target.getClass().getInterfaces(), this);
    }
    //处理代理实例并返回结果
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        log(method.getName());
        //动态代理的本质就是使用反射机制实现
        Object result = method.invoke(target, args);
        return result;
    }
    public void log(String msg){
        System.out.println("执行了"+msg+"方法");
    }
}

<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.9.8.RC1</version>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">



<!--    注册Bean-->
    <bean id="userService" class="org.mecca.service.UserServiceImpl"/>
    <bean id="log" class="org.mecca.log.Log"/>
    <bean id="afterLog" class="org.mecca.log.AfterLog"/>

<!--    方式一: 使用原生的Spring API接口-->
<!--    配置Aop  导入aop的约束-->
    <aop:config>
<!--    切入点:expression表达式   execution(要执行的位置!)-->
        <aop:pointcut id="pointcut" expression="execution(* org.mecca.service.UserServiceImpl.*(..))"/>

<!--    执行环绕增加!-->
        <aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
        <aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>

    </aop:config>

<!--    方式二: 自定义类-->
    <bean id="diy" class="org.mecca.diy.DiyPointCut"/>
    <aop:config>
<!--        自定义切面 ref引用-->
        <aop:aspect ref="diy">
<!--            切入点-->
            <aop:pointcut id="point" expression="execution(* org.mecca.service.UserServiceImpl.*(..))"/>
<!--            通知-->
            <aop:before method="before" pointcut-ref="point"/>
            <aop:after method="after" pointcut-ref="point"/>
        </aop:aspect>
    </aop:config>

</beans>

package org.mecca.diy;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
//使用注解方式实现AOP
@Aspect//标注这个类是一个切面
public class AnnotationPointCut {
    @Before("execution(* org.mecca.service.UserServiceImpl.*(..))")
    public void before(){
        System.out.println("===方法执行前===");
    }

    @After("execution(* org.mecca.service.UserServiceImpl.*(..))")
    public void after(){
        System.out.println("===方法执行后===");
    }
    //在环绕增强中,我们可以给定一个参数,代表我们要获取处理切入的点
    @Around("execution(* org.mecca.service.UserServiceImpl.*(..))")
    public void around(ProceedingJoinPoint joinPoint) throws Throwable {
        System.out.println("环绕前");

        //执行方法
        Object proceed = joinPoint.proceed();

        System.out.println("环绕后");
    }
}

<!--    方式三:-->
    <bean id="annotationPointCut" class="org.mecca.diy.AnnotationPointCut"/>
<!--    开启注解支持-->
    <aop:aspectj-autoproxy/>