Spring 学习笔记

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>

public class Hello {
   private String name;

   public String getName() {
       return name;
  }
   public void setName(String name) {
       this.name = name;
  }

   public void show(){
       System.out.println("Hello,"+ name );
  }
}

<?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 http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--
        classs:配置类的全类名
        id:配置一个唯一标识
    -->
    <bean id="hello" class="com.study.dao.Hello">
       <property name="name" value="Spring"/>
   </bean>

</beans>

    public static void main(String[] args) {
        / //解析beans.xml文件 , 生成管理相应的Bean对象
   		ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
  		 //getBean : 参数即为spring配置文件中bean的id .
  		 Hello hello = (Hello) context.getBean("hello");
  		 hello.show();
    }

//1.实体类Hello
//2.1原来的需要new一个实体对象来获取实体类的set/get及其他方法
		Hello hello1 = new Hello();
        hello1.setName("spring");
        hello1.show();
//2.2现在可以在xml文件中配置bean，即映射对象
<bean id="hello" class="com.study.dao.Hello">
//id为读取该对象的标识，class为反射的地址
//现在创建对象，只需要创建spring容器，再用getBean()方法来读取id创建对象
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
Hello hello = (Hello) context.getBean("hello");
//再正常调用其方法即可
hello.show();

<bean id="userService" name="aaa,bbb" class="com.itheima.service.impl.UserServiceImpl"/>

applicationContext.getBean("userService");
applicationContext.getBean("aaa");
applicationContext.getBean("bbb");

<bean name="aaa,bbb" class="com.itheima.dao.impl.UserDaoImpl"/>

<bean id="userDao" class="com.itheima.dao.impl.UserDaoImpl" lazy-init="true"/>

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Student {

    private String name;
    private int id;
    private int age;
	//初始化方法
    public void init(){
        System.out.println("对学生对象进行初始化操作");
    }
}

<bean class="com.sangeng.domain.Student" id="student" init-method="init"></bean>

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Student {

    private String name;
    private int id;
    private int age;

    public void init(){
        System.out.println("对学生对象进行初始化操作");
    }

    public void close(){
        System.out.println("对象销毁之前调用，用于释放资源");
    }
}

<bean class="com.sangeng.domain.Student" id="student"  destroy-method="close"></bean>

    <!--创建实例工厂-->
    <bean class="com.sangeng.factory.CarFactory" id="carFactory"></bean>
    <!--使用实例工厂创建Car放入容器-->
    <!--factory-bean 用来指定使用哪个工厂对象-->
    <!--factory-method 用来指定使用哪个工厂方法-->
    <bean factory-bean="carFactory" factory-method="getCar" id="car"></bean>

      ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        //获取car对象
        Car c = (Car) app.getBean("car");
        System.out.println(c);

    <!--创建实例工厂-->
    <bean class="com.sangeng.factory.CarFactory" id="carFactory"></bean>
    <!--使用实例工厂创建Car放入容器-->
    <!--factory-bean 用来指定使用哪个工厂对象-->
    <!--factory-method 用来指定使用哪个工厂方法-->
    <bean factory-bean="carFactory" factory-method="getCar" id="car"></bean>

       ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        //获取car对象
        Car c = (Car) app.getBean("car");
        System.out.println(c);

<bean id="bean1" class="" primary="true" />

default-autowire-candidates="*Service"

<?xml version="1.0" encoding="UTF-8"?>
<!--xmlns:ns是namespace的缩写-->
<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 
						http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>

<!-- 配置测试环境下，需要加载的Bean实例 --> 
<beans profile="test">
</beans>
<!-- 配置开发环境下，需要加载的Bean实例 --> 
<beans profile="dev">
</beans>

<!--导入用户模块配置文件--> 
<import resource="classpath:UserModuleApplicationContext.xml"/>
<!--导入商品模块配置文件--> 
<import resource="classpath:ProductModuleApplicationContext.xml"/>

<bean id="userService" name="aaa,bbb" class="com.itheima.service.impl.UserServiceImpl"> 
	<property name="userDao" ref="userDao"/>
</bean>
<!--指定别名--> 
<alias name="userService" alias="xxx"/>
<alias name="userService" alias="yyy"/>

<!--默认标签--> 
<bean id="userDao" class="com.itheima.dao.impl.UserDaoImpl"/>
<!--自定义标签--> 
<context:property-placeholder/>
<mvc:annotation-driven/>
<dubbo:application name="application"/>

package com.sangeng.domain;

public class Student {

    private String name;
    private int id;
    private int age;

    private Dog dog;

    public Dog getDog() {
        return dog;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", id=" + id +
                ", age=" + age +
                '}';
    }

    public Student() {

    }

    public Student(String name, int id, int age) {
        this.name = name;
        this.id = id;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

 <bean class="com.sangeng.domain.Dog" id="dog">
        <property name="name" value="小白"></property>
        <property name="age" value="6"></property>
    </bean>

    <bean class="com.sangeng.domain.Student" id="student" >
        <!--
            name属性用来指定要设置哪个属性
            value属性用来设置要设置的值
            ref属性用来给引用类型的属性设置值，可以写上Spring容器中bean的id
        -->
        <property name="name" value="东南枝"></property>
        <property name="age" value="20"></property>
        <property name="id" value="1"></property>
        <property name="dog" ref="dog"></property>
    </bean>

public class Student {

    private String name;
    private int id;
    private int age;

    private Dog dog;

    public Student(String name, int id, int age, Dog dog) {
        this.name = name;
        this.id = id;
        this.age = age;
        this.dog = dog;
    }
    //.....省略其他
}

    <!--使用有参构造进行注入有三种方式编写-->
	<!-- 第一种根据index参数下标设置 -->
 	<bean class="com.sangeng.domain.Student" id="student2" >
         <!-- index指构造方法 , 下标从0开始 -->
   		<constructor-arg index="0" value="kuangshen2"/>
     </bean>
    <!-- 第二种根据参数名字设置 -->
    <bean class="com.sangeng.domain.Student" id="student2" >
        <!-- name指参数名 -->
        <constructor-arg name="name" value="自挂东南枝"></constructor-arg>
        <constructor-arg name="age" value="20"></constructor-arg>
        <constructor-arg name="id" value="30"></constructor-arg>
        <constructor-arg name="dog" ref="dog"></constructor-arg>
    </bean>
	<!-- 第三种根据参数类型设置 -->
	<bean id="userT" class="com.kuang.pojo.UserT">
  		 <constructor-arg type="java.lang.String" value="kuangshen2"/>
	</bean>

<context:property-placeholder location="classpath:filename.properties">

<property name="propertyName" value="${key}"/>

 <property name="info">
     <props>
         <prop key="学号">20190604</prop>
         <prop key="性别">男</prop>
         <prop key="姓名">小明</prop>
     </props>
 </property>

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private int age;
    private String name;
    private Phone phone;
    private List<String> list;
    private List<Phone> phones;
    private Set<String> set;
    private Map<String, Phone> map;
    private int[] arr;
    private Properties properties;
}

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Phone {
    private double price;
    private String name;
    private String password;
    private String path;

}

<?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 http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean class="com.sangeng.domain.Phone" id="phone">
        <!--phone实体类中基本类型注入-->
        <property name="price" value="3999"></property>
        <property name="name" value="黑米"></property>
        <property name="password" value="123"></property>
        <property name="path" value="qqqq"></property>
    </bean>
    
    <bean class="com.sangeng.domain.User" id="user">
        <property name="age" value="10"></property>
        <property name="name" value="大队长"></property>
         <!--user实体类中phone实体类注入,用ref-->
        <property name="phone" ref="phone"></property>
         <!--list集合注入，里面的数据类型为基本类型-->
        <property name="list">
            <list>
                <value>三更</value>
                <value>西施</value>
            </list>
        </property>
		<!--list集合注入，里面的数据类型为引用类型-->
        <property name="phones">
            <list>
                <ref bean="phone"></ref>
            </list>
        </property>
		<!--set集合注入，里面的数据类型为基本类型-->
        <property name="set">
            <set>
                <value>setEle1</value>
                <value>setEle2</value>
            </set>
        </property>
		<!--map集合注入，key为基本类型，value为引用类型-->
        <property name="map">
            <map>
                <entry key="k1" value-ref="phone"></entry>
                <entry key="k2" value-ref="phone"></entry>
            </map>
        </property>
		<!--arr数组注入，里面的数据类型为基本类型-->
        <property name="arr">
            <array>
                <value>10</value>
                <value>11</value>
            </array>
        </property>
		<!--properties类型注入，里面的数据类型为引用类型-->
        <property name="properties">
            <props>
                <prop key="k1">v1</prop>
                <prop key="k2">v2</prop>
            </props>
        </property>
        <!--Null注入-->
        <property name="wife"><null/></property>
    </bean>
</beans>

 导入约束 : xmlns:p="http://www.springframework.org/schema/p"
<!--xmlns:ns是namespace的缩写-->
 <!--P(属性: properties)命名空间 , 直接注入属性-->
 <bean id="user" class="com.kuang.pojo.User" p:name="狂神" p:age="18"/>

 导入约束 : xmlns:c="http://www.springframework.org/schema/c"
 <!--C(构造: Constructor)命名空间 , 使用构造器注入-->
 <bean id="user" class="com.kuang.pojo.User" c:name="狂神" c:age="18"/>

 <bean id="ServiceImpl" class="cn.csdn.service.ServiceImpl" scope="singleton">

 <bean id="account" class="com.foo.DefaultAccount" scope="prototype"/>  
  或者
 <bean id="account" class="com.foo.DefaultAccount" singleton="false"/>

 <bean id="loginAction" class=cn.csdn.LoginAction" scope="request"/>

 <bean id="userPreferences" class="com.foo.UserPreferences" scope="session"/>

<!--启动组件扫描，指定对应扫描的包路径，该包及其子包下所有的类都会被扫描，加载包含指定注解的类-->
<context:component-scan base-package="com.sangeng"/>

@Component("user")
// 相当于配置文件中 <bean id="user" class="当前注解的类"/>
public class User {
   @Value("秦疆")
   // 相当于配置文件中 <property name="name" value="秦疆"/>
   public String name;
}

@Component("user")
public class User {

   public String name;

   @Value("秦疆")
   public void setName(String name) {
       this.name = name;
  }
}

@Service("userService")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Value("199")
    private int num;
    @Value("三更草堂")
    private String str;

    @Value("#{19+3}")
    private Integer age;


    public void show() {
        userDao.show();
    }
}

@Configuration
public class ApplicationConfig {
}

@Configuration
@ComponentScan(basePackages = "com.sangeng")//指定要扫描的包
public class ApplicationConfig {
}

@Configuration
@ComponentScan(basePackages = "com.sangeng")
public class ApplicationConfig {

    @Bean("dataSource")
    public DruidDataSource getDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName("com.mysql.jdbc.Driver");
        druidDataSource.setUsername("root");
        druidDataSource.setUrl("jdbc:mysql://localhost:3306/mybatis_db");
        druidDataSource.setPassword("root");
        return druidDataSource;
    }

}

    public static void main(String[] args) {
        //创建注解容器
        AnnotationConfigApplicationContext app = new AnnotationConfigApplicationContext(ApplicationConfig.class);
		//根据对应类的字节码对象获取
        DataSource bean = app.getBean(DataSource.class);
        System.out.println(userService);
    }

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_db
jdbc.username=root
jdbc.password=root

@Configuration
@ComponentScan(basePackages = "com.sangeng")
@PropertySource("jdbc.properties")
public class ApplicationConfig {

    @Value("${jdbc.driver}")
    private String driverClassName;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;

    @Bean
    public DruidDataSource getDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName(driverClassName);
        druidDataSource.setUsername(username);
        druidDataSource.setUrl(url);
        druidDataSource.setPassword(password);
        return druidDataSource;
    }
}

@Configuration  //代表这是一个配置类
public class MyConfig1 {
}

@Configuration  //代表这是一个配置类
@Import(MyConfig1.class)  //导入合并其他配置类，类似于配置文件中的 inculde 标签
public class MyConfig2 {
    @Bean
   public Dog dog(){
       return new Dog();
  }
}

        <!--SpringIOC相关依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--AOP相关依赖-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>

<context:component-scan base-package="com.sangeng"></context:component-scan>

@Service
public class PhoneService {

    public void deleteAll(){
        System.out.println("PhoneService中deleteAll的核心代码");
    }
}

@Service
public class UserService {
    public void deleteAll(){
        System.out.println("UserService中deleteAll的核心代码");
    }
}

<?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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <!--开启组件扫描-->
    <context:component-scan base-package="com.sangeng"></context:component-scan>
    <!--开启aop注解支持-->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>

@Component
@Aspect
public class MyAspect {
//方式一：
//    用Pointcut注解中的属性来指定对哪些方法进行增强
    @Pointcut("execution(* com.sangeng.service.*.*(..))")
    public void pt(){}

    /*
        用@Before注解来指定该方法中是增强的代码，并且是在被增强方法执行前执行的
        @Before的属性写上加了@Pointcut注解的方法: 方法名()
    */
    @Before("pt()")
    public void methodbefore(){
        System.out.println("方法被调用了");
    }
    //方式二：
    //
     @Before("execution(* com.sangeng.service.*.*(..))")
    public void methodbefore(){
        System.out.println("方法被调用了");
    }

}

    public static void main(String[] args) {                                              ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        PhoneService phoneService = applicationContext.getBean(PhoneService.class);
        UserService userService = applicationContext.getBean(UserService.class);
        phoneService.deleteAll();

    }
//结果
/*
方法被调用了
PhoneService中deleteAll的核心代码
UserService中deleteAll的核心代码
*/

execution(* com.sangeng.service.*.*(..))   表示com.sangeng.service包下任意类，方法名任意，参数列表任意，返回值类型任意
   
execution(* com.sangeng.service..*.*(..))   表示com.sangeng.service包及其子包下任意类，方法名任意，参数列表任意，返回值类型任意
    
execution(* com.sangeng.service.*.*())     表示com.sangeng.service包下任意类，方法名任意，要求方法不能有参数，返回值类型任意
    
execution(* com.sangeng.service.*.delete*(..))     表示com.sangeng.service包下任意类，要求方法不能有参数，返回值类型任意,方法名要求已delete开头

@Target({ElementType.METHOD})//该注解可以加在方法上
@Retention(RetentionPolicy.RUNTIME)
public @interface InvokeLog {


}

@Service
public class PhoneService {

    @InvokeLog  
    public void deleteAll(){
        System.out.println("PhoneService中deleteAll的核心代码");
    }
}

@Component
@Aspect
public class MyAspect {

//    用Pointcut注解中的属性来指定对哪些方法进行增强
    @Pointcut("@annotation(com.sangeng.aspect.InvokeLog)")
    public void pt(){}

    /*
        用@Before注解来指定该方法中是增强的代码，并且是在被增强方法执行前执行的
        @Before的属性写上加了@Pointcut注解的方法: 方法名()
    */
    @Before("pt()")
    public void methodbefore(){
        System.out.println("方法被调用了");
    }
}

    public Object test() {
        before();//@Before 前置通知
        try {
            Object ret = 目标方法();//目标方法调用
            afterReturing();//@AfterReturning 返回后通知
        } catch (Throwable throwable) {
            throwable.printStackTrace();
            afterThrowing();//@AfterThrowing 异常通知通知
        }finally {
            after();//@After 后置通知
        }
        return ret;
    }

@Around("pt()")
public void around(ProceedingJoinPoint pjp){
    System.out.println("目标方法前");
    try {
        pjp.proceed();//目标方法执行
        System.out.println("目标方法后");
    } catch (Throwable throwable) {
        throwable.printStackTrace();
        System.out.println("目标方法出现异常");
    }finally {
        System.out.println("finally中进行增强");
    }
}

package org.aspectj.lang;
 
public interface Signature {
    String toString();/字符输出
 
    String toShortString();//短字符输出
 
    String toLongString();//长字符输出
 
    String getName();//方法名
 
    int getModifiers();//返回修饰符的整型标识
 
    Class getDeclaringType();//返回类名类型
 
    String getDeclaringTypeName();////返回类名
}

    @Before("pt()")
    public void methodbefore(JoinPoint jp){
        Object[] args = jp.getArgs();//方法调用时传入的参数
        Object target = jp.getTarget();//被代理对象
        MethodSignature signature = (MethodSignature) jp.getSignature();//获取被被增强方法签名封装的对象
        System.out.println("Before方法被调用了");
    }

@Component
@Aspect
public class PrintLogAspect {

    //对哪些方法增强
    @Pointcut("execution(* com.sangeng.service..*.*(..))")
    public void pt(){}

    //怎么增强
    @Before("pt()")
    public void printLog(JoinPoint joinPoint){
        //输出 被增强的方法所在的类名 方法名 调用时传入的参数   joinPoint.getSignature().getName()  joinPoint.getArgs()
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //类名
        String className = signature.getDeclaringTypeName();
        //方法名
        String methodName = signature.getName();
        //调用时传入的参数
        Object[] args = joinPoint.getArgs();

        System.out.println(className+"=="+methodName+"======"+ Arrays.toString(args));
    }
}

@AfterReturning(value = "pt()",returning = "ret")//使用returning属性指定了把目标方法返回值赋值给下面方法的参数ret
public void AfterReturning(JoinPoint jp,Object ret){
    System.out.println("AfterReturning方法被调用了");
}

@AfterThrowing(value = "pt()",throwing = "t")//使用throwing属性指定了把出现的异常对象赋值给下面方法的参数t
public void AfterThrowing(JoinPoint jp,Throwable t){
    System.out.println("AfterReturning方法被调用了");
}

    @Around(value = "pt()")
    public Object around(ProceedingJoinPoint pjp) {
        Object[] args = pjp.getArgs();//方法调用时传入的参数
        Object target = pjp.getTarget();//被代理对象
        MethodSignature signature = (MethodSignature) pjp.getSignature();//获取被被增强方法签名封装的对象
        Object ret = null;
        try {
            ret = pjp.proceed();//ret就是目标方法执行后的返回值
        } catch (Throwable throwable) {
            throwable.printStackTrace();//throwable就是出现异常时的异常对象
        }
        return ret;
    }

<!-- 1. expose-proxy。为是否暴露当前代理对象为ThreadLocal模式，默认为false   -->
<!-- 2. proxy-target-class决定代理的创建方式，默认为false即jkd代理，   -->
<aop:config expose-proxy="true/false" proxy-target-class="true/false">
        <!--定义切点 id为切点名称，expression为切点表达式，annotation为注释类-->
        <aop:pointcut id="pt1" expression="execution(* com.sangeng.service..*.*(..))"></aop:pointcut>
        <aop:pointcut id="pt2" expression="@annotation(com.sangeng.aspect.InvokeLog)"></aop:pointcut>
        <!--配置切面 id为String类型的名称，ref为切面对象的名称，order为aop执行顺序-->
        <aop:aspect  id="" ref="myAspect" order="" >
            <!--aspect有5种- @Before， @AfterReturning，@After，@AfterThrowing，@Around通知类型，
  				declare-parents同时为特定的类增加新的功能-->
            <!-- declare-parents中 types-matching为匹配类型，implement-interface为接口名称   -->
            <aop:declare-parents types-matching="" implement-interface=""></aop:declare-parents>
            <!--method为执行5种通知的方法名称。  pointcut-ref为切点的id名称，对应执行切点的路径   -->
            <aop:before method="before" pointcut-ref="pt1"></aop:before>
            <aop:after method="after" pointcut-ref="pt1"></aop:after>
            <!--  after-returning有返回值returning  -->
            <aop:after-returning method="afterReturning" pointcut-ref="pt1" returning="ret"></aop:after-returning>
            <!-- after-throwing有throwing抛出异常的参数   -->
            <aop:after-throwing method="afterThrowing" pointcut-ref="pt2" throwing="e"></aop:after-throwing>
        </aop:aspect>
    </aop:config>

<aop:advisor advice-ref="" order="" id="" pointcut="" pointcut-ref=""></aop:advisor>
<aop:aspect id="" ref="" order="">
            ...
        </aop:aspect>

public class MyAspect {


    public void before(JoinPoint joinPoint){
        System.out.println("before");
    }

//    @AfterReturning(value = "pt()",returning = "ret")
    public void afterReturning(JoinPoint joinPoint,Object ret){
        System.out.println("afterReturning:"+ret);
    }
//    @After("pt()")
    public void after(JoinPoint joinPoint){
        System.out.println("after");
    }

//    @AfterThrowing(value = "pt()",throwing = "e")
    public void afterThrowing(JoinPoint joinPoint,Throwable e){
        String message = e.getMessage();
        System.out.println("afterThrowing:"+message);
    }

    public Object around(ProceedingJoinPoint pjp){
        //获取参数
        Object[] args = pjp.getArgs();
        MethodSignature signature = (MethodSignature) pjp.getSignature();
        Object target = pjp.getTarget();
        Object ret = null;
        try {
            ret = pjp.proceed();//目标方法的执行
            //ret就是被增强方法的返回值
            System.out.println(ret);
        } catch (Throwable throwable) {
            throwable.printStackTrace();
            System.out.println(throwable.getMessage());
        }
//        System.out.println(pjp);
        return ret;
    }
}

@Component//把切面类注入容器
public class MyAspect {
	//..。省略无关代码
}

@Service//把目标类注入容器
public class UserService {
	//..。省略无关代码
}

<?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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--开启组件扫描-->
    <context:component-scan base-package="com.sangeng"></context:component-scan>

    <!--配置AOP-->
    <aop:config>
        <!--定义切点-->
        <aop:pointcut id="pt1" expression="execution(* com.sangeng.service..*.*(..))"></aop:pointcut>
        <aop:pointcut id="pt2" expression="@annotation(com.sangeng.aspect.InvokeLog)"></aop:pointcut>
        <!--配置切面-->
        <aop:aspect ref="myAspect">
            <aop:before method="before" pointcut-ref="pt1"></aop:before>
            <aop:after method="after" pointcut-ref="pt1"></aop:after>
            <aop:after-returning method="afterReturning" pointcut-ref="pt1" returning="ret"></aop:after-returning>
            <aop:after-throwing method="afterThrowing" pointcut-ref="pt2" throwing="e"></aop:after-throwing>
        </aop:aspect>
    </aop:config>
</beans>

public static void main(String[] args) {
        AIControllerImpl aiController = new AIControllerImpl();
        //使用动态代理增强getAnswer方法
        //1.JDK动态代理
        //获取类加载器
        ClassLoader cl = Demo.class.getClassLoader();
        //被代理类所实现接口的字节码对象数组
        Class<?>[] interfaces = AIControllerImpl.class.getInterfaces();
        AIController proxy = (AIController) Proxy.newProxyInstance(cl, interfaces, new InvocationHandler() {
            //使用代理对象的方法时 会调用到invoke
                public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                //proxy   是代理对象
                //method 是当前被调用的方法封装的Method对象
                //args   是调用方法时传入的参数
                //调用被代理对象的对应方法
                //判断 当前调用的是否是getAnswer方法
                if(method.getName().equals("getAnswer")){
                    System.out.println("增强");
                }
                Object ret = method.invoke(aiController, args);
                return ret;
            }
        });
        String answer = proxy.getAnswer("三连了吗？");
		System.out.println(answer);
    }

public class CglibDemo {
    public static void main(String[] args) {
        Enhancer enhancer = new Enhancer();
        //设置父类的字节码对象
        enhancer.setSuperclass(AIControllerImpl.class);
        enhancer.setCallback(new MethodInterceptor() {
            //使用代理对象执行方法是都会调用到intercept方法
            @Override
            public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
                //判断当前调用的方法是不是getAnswer方法 如果是进行增强
                if ("getAnswer".equals(method.getName())){
                    System.out.println("被增强了");
                }
                //调用父类中对应的方法
                Object ret = methodProxy.invokeSuper(o, objects);
                return ret;
            }
        });
        //生成代理对象
        AIControllerImpl proxy = (AIControllerImpl) enhancer.create();
//        System.out.println(proxy.getAnswer("你好吗？"));
        System.out.println(proxy.fortuneTelling("你好吗？"));
    }
}

<aop:aspectj-autoproxy proxy-target-class="true"/><!--默认false为jdk代理-->

<aop:config proxy-target-class="true">
</aop:config>

<!-- junit -->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
</dependency>
<!-- spring整合junit的依赖 -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>5.1.9.RELEASE</version>
</dependency>

@RunWith(SpringJUnit4ClassRunner.class)//让测试运行与Spring测试环境
@ContextConfiguration(locations = "classpath:配置文件1.xml")//设置Spring配置文件或者配置类
//@ContextConfiguration(classes = SpringConfig.class)
public class SpringTest {}

@RunWith(SpringJUnit4ClassRunner.class)//让测试运行与Spring测试环境
@ContextConfiguration(locations = "classpath:配置文件1.xml")//设置Spring配置文件或者配置类
//@ContextConfiguration(classes = SpringConfig.class)
public class SpringTest {
    
    // 想测哪个对象，就注入哪个对象
    @Autowired
    private UserService userService;
    
    //定义测试方法
    @Test
    public void testUserService() {
        userService.findById(10);
    }
    
}

	<!-- spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>

    <!-- mybatis整合到Spring的整合包 -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.4</version>
    </dependency>

    <!--mybatis依赖-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.4</version>
    </dependency>
    <!--mysql驱动-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>

    <!-- druid数据源 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.16</version>
    </dependency>

    <!--读取jdbc.properties文件-->
    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
    <!--创建连接池注入容器-->
    <bean class="com.alibaba.druid.pool.DruidDataSource" id="dataSource">
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="driverClassName" value="${jdbc.driver}"></property>
    </bean>   
<!--spring整合mybatis后控制的创建获取SqlSessionFactory的对象-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sessionFactory">
        <!--配置连接池-->
        <property name="dataSource" ref="dataSource"></property>
        <!--配置mybatis配置文件的路径-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    </bean>

    <!--mapper扫描配置，扫描到的mapper对象会被注入Spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" id="mapperScannerConfigurer">
        <property name="basePackage" value="com.sangeng.dao"></property>
    </bean>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
		<!--将表中字段的下划线自动转换为驼峰-->
		<setting name="mapUnderscoreToCamelCase" value="true"/>
		<!--开启延迟加载-->
		<setting name="lazyLoadingEnabled" value="true"/>
	</settings>
    <typeAliases>
        <package name="com.sangeng.domain"></package>
    </typeAliases>
</configuration>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

        
<configuration>
<!--引入properties文件,在spring配置文件中已经配置-->
    <properties resource="jdbc.properties"></properties>
    <settings>
		<!--将表中字段的下划线自动转换为驼峰-->
		<setting name="mapUnderscoreToCamelCase" value="true"/>
		<!--开启延迟加载-->
		<setting name="lazyLoadingEnabled" value="true"/>
	</settings>

    <!--设置类型别名-->
    <typeAliases>
        <!--以包为单位，将包下所有的类型设置默认的类型别名，即类名且不区分大小写-->
        <package name="com.wang.pojo"/>
    </typeAliases>
<!--设置数据库，在spring配置文件中已经配置-->
    <environments default="development">
        <environment id="development">
           
            <transactionManager type="JDBC"/>
           
            <dataSource type="POOLED">
                <!--设置连接数据库的驱动-->
                <property name="driver" value="${jdbc.driver}"/>
                <!--设置连接数据库的连接地址-->
                <property name="url" value="${jdbc.url}"/>
                <!--设置连接数据库的用户名-->
                <property name="username" value="${jdbc.username}"/>
                <!--设置连接数据库的密码-->
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <!--引入MyBatis映射文件，在spring配置文件中已经配置-->
    <mappers>
        <package name="com.wang.mapper"/>
    </mappers>
</configuration>

@Autowired
private UserDao userDao;
//...测试代码
public class MybatisTest {
    @Test
    public void getEmpAndDeptTest(){
        System.out.println(user.getEmpAndDept(1));//直接写写测试代码
        
    }

public class MybatisTest {
    @Test
    public void getEmpAndDeptTest(){
        SqlSession sqlSession = SqlsessionUtils.getSqlSession();//先创建容器
        EmpMapper mapper = sqlSession.getMapper(EmpMapper.class);//再获取容器中的对象
        System.out.println(mapper.getEmpAndDept(1));//最后才能写测试代码
        
    }

CREATE DATABASE /*!32312 IF NOT EXISTS*/`spring_db` /*!40100 DEFAULT CHARACTER SET utf8 */;
USE `spring_db`;
DROP TABLE IF EXISTS `account`;
CREATE TABLE `account` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(50) DEFAULT NULL,
  `money` DOUBLE DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
INSERT  INTO `account`(`id`,`name`,`money`) VALUES (1,'三更',100),(2,'草堂',100);

public interface AccountService {
    /**
     * 转账
     * @param outId 转出账户的id
     * @param inId 转出账户的id
     * @param money 转账金额
     */
    public void transfer(Integer outId,Integer inId,Double money);
}

@Service
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccoutDao accoutDao;

    public void transfer(Integer outId, Integer inId, Double money) {
        //增加
        accoutDao.updateMoney(inId,money);
        //减少
        accoutDao.updateMoney(outId,-money);
    }
}

public interface AccoutDao {

    void updateMoney(@Param("id") Integer id,@Param("updateMoney") Double updateMoney);
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sangeng.dao.AccoutDao">


    <update id="updateMoney">
        update  account set money = money + #{updateMoney} where id = #{id}
    </update>
</mapper>

    <!--把事务管理器注入Spring容器，需要配置一个连接池-->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--开启事务注解驱动，配置使用的事务管理器-->
    <tx:annotation-driven transaction-manager="txManager"/>

    @Transactional
    public void transfer(Integer outId, Integer inId, Double money) {
        //增加
        accoutDao.updateMoney(inId,money);
//        System.out.println(1/0);
        //减少
        accoutDao.updateMoney(outId,-money);
    }

       <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>

    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

 	<!--定义事务管理的通知类-->
    <tx:advice transaction-manager="txManager" id="txAdvice">
        <tx:attributes>
            <tx:method name="trans*"/>
        </tx:attributes>
    </tx:advice>

    <aop:config>
        <aop:pointcut id="pt" expression="execution(* com.sangeng.service..*.*(..))"></aop:pointcut>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt"></aop:advisor>
    </aop:config>

       <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>

    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void transfer(Integer outId, Integer inId, Double money) {
        //增加
        accoutDao.updateMoney(inId,money);
        //减少
        accoutDao.updateMoney(outId,-money);
    }

   @Transactional(propagation = Propagation.REQUIRES_NEW,isolation = Isolation.READ_COMMITTED)
    public void transfer(Integer outId, Integer inId, Double money) {
        //增加
        accoutDao.updateMoney(inId,money);
        //减少
        accoutDao.updateMoney(outId,-money);
    }

    @Transactional(readOnly = true)
    public void log() {
        System.out.println("打印日志");
        int i = 1/0;
    }