Spring入门
HUII
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学习笔记,编程开发

2302 字
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52 分钟
本文发布于1380 天前，最后更新于787天前，其中的信息可能已经有所发展或是发生改变。

Spring

简介

  • 雏形：interface21
  • 诞生：2004年3月24日
  • 理念：使现有的技术更加容易使用，本身是大杂烩，整合了现有的技术框架。
  • spring web mvc
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.3.9</version>
</dependency>

优点

  • 开源免费框架
  • 非入侵式，轻量级
  • 控制反转（IOC），面向切面编程（AOP）
  • 支持事务的处理，对框架整合的支持

组成

拓展

Spring Boot

  • 一个快速开发的脚手架
  • 基于Spring Boot可以快速开发单个微服务
  • 约定大于配置

SpringCloud

  • Spring Cloud是基于Spring Boot实现的

大部分公司都在使用Spring Boot开发，Spring和Spring MVC是学习的前提

IOC

ioc原型（控制反转）

利用set实现动态值注入，发生了革命性变化

//    利用set实现动态值注入
    public void setUserDao(UserDao userDao){
        this.userDao = userDao;
    }
}
  • 之前程序是主动创建对象，控制权在程序员手上
  • 使用set注入后，程序不再具有主动性，而是变成被动接受对象。

控制反转是一种通过描述（XML或注解）并通过第三方去生产或获取特定对象的方式。在Spring中实现控制反转的是IOC容器，其实现方法是依赖注入。

Hello Spring

结构如图

image-20210801210639422

Hello.java

package top.huii.pojo;

public class Hello {
    private String str;

    public String getStr() {
        return str;
    }

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

    @Override
    public String toString() {
        return "Hello{" +
                "str='" + str + '\'' +
                '}';
    }
}

配置文件beans.xml(可使用IDEA生成模板)

image-20210801210814821
<?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 = 对象 new Hello()
property相当于给内容赋值
-->
    <bean id="Hello" class="top.huii.pojo.Hello">
        <property name="str" value="Spring"/>
    </bean>
</beans>

测试文件MyTest.java

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import top.huii.pojo.Hello;

public class MyTest{
    public static void main(String[] args) {
        // 获取spring的上下文对象
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        Hello hello = (Hello) context.getBean("Hello");
        System.out.println(hello.toString());
    }
}

IOC创建对象的方法

1 使用无参构造创建对象。默认

2 有参构造

①下标赋值

<bean id="exampleBean" class="examples.ExampleBean">
    <constructor-arg index="0" value="7500000"/>
    <constructor-arg index="1" value="42"/>
</bean>

② 参数类型匹配(不建议使用)

<bean id="exampleBean" class="examples.ExampleBean">
    <constructor-arg type="int" value="7500000"/>
    <constructor-arg type="java.lang.String" value="42"/>
</bean>

③通过参数名设置

<bean id="exampleBean" class="examples.ExampleBean">
    <constructor-arg name="years" value="7500000"/>
    <constructor-arg name="ultimateAnswer" value="42"/>
</bean>

Spring配置

别名

<alias name="fromName" alias="toName"/>

Bean配置

<bean id="exampleBean" class="examples.ExampleBean" name="user user2,user3;user4">
    <property name="integerProperty" value="1"/>
</bean>

import

ApplicationContext.xml

<beans>
    <import resource="services.xml"/>
    <import resource="resources/messageSource.xml"/>
    <import resource="/resources/themeSource.xml"/>

    <bean id="bean1" class="..."/>
    <bean id="bean2" class="..."/>
</beans>

依赖注入

构造器注入

上面已经说过

set方式注入（*）

依赖

bean的创建依赖于容器

注入

bean对象中的所有属性，由容器来注入

代码

Address.java

package top.huii.pojo;

public class Address {
    private String address;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Address{" +
                "address='" + address + '\'' +
                '}';
    }
}

Student.java

package top.huii.pojo;

import java.util.*;

public class Student {
    private String name;
    private Address address;
    private String[] books;
    private List<String> hobbies;
    private Map<String, String> card;
    private Set<String> games;
    private String wife;
    private Properties info;

    public String getName() {
        return name;
    }

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

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public String[] getBooks() {
        return books;
    }

    public void setBooks(String[] books) {
        this.books = books;
    }

    public List<String> getHobbies() {
        return hobbies;
    }

    public void setHobbies(List<String> hobbies) {
        this.hobbies = hobbies;
    }

    public Map<String, String> getCard() {
        return card;
    }

    public void setCard(Map<String, String> card) {
        this.card = card;
    }

    public Set<String> getGames() {
        return games;
    }

    public void setGames(Set<String> games) {
        this.games = games;
    }

    public String getWife() {
        return wife;
    }

    public void setWife(String wife) {
        this.wife = wife;
    }

    public Properties getInfo() {
        return info;
    }

    public void setInfo(Properties info) {
        this.info = info;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", address=" + address.toString() +
                ", books=" + Arrays.toString(books) +
                ", hobbies=" + hobbies +
                ", card=" + card +
                ", games=" + games +
                ", wife='" + wife + '\'' +
                ", info=" + info +
                '}';
    }

}

beans.xml

<?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 id="address" class="top.huii.pojo.Address">
        <property name="address" value="合肥"/>
    </bean>
    <bean id="student" class="top.huii.pojo.Student">
        <!--普通类，value-->
        <property name="name" value="HUII"/>
        <!--Bean注入-->
        <property name="address" ref="address"/>
        <!--数组注入-->
        <property name="books">
            <array>
                <value>红楼梦</value>
                <value>西游记</value>
                <value>水浒传</value>
                <value>三国演义</value>
            </array>
        </property>
        <!--list-->
        <property name="hobbies">
            <list>
                <value>听歌</value>
                <value>代码</value>
            </list>
        </property>
        <!--map-->
        <property name="card">
            <map>
                <entry key="身份证" value="11111111111111111111111"/>
            </map>
        </property>
        <!--set-->
        <property name="games">
            <set>
                <value>LOL</value>
                <value>qqfc</value>
            </set>
        </property>
        <!--null-->
        <property name="wife">
            <null/>
        </property>
        <!--properties-->
        <property name="info">
            <props>
                <prop key="学号">2019210001</prop>
                <prop key="国籍">中国</prop>
            </props>
        </property>
    </bean>
</beans>

MyTest.java

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import top.huii.pojo.Student;

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.getName());
        System.out.println(student.toString());
    }
}

扩展方式

p命名空间

user.java

package top.huii.pojo;

public class User {
    private String name;
    private int age;

    public User() {
    }

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

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

userbeans.xml

<?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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--p命名空间可以直接注入属性-->
    <bean id="user" class="top.huii.pojo.User" p:age="18" p:name="HUII"/>
</beans>

测试

public class MyTest {
    @Test
    public void test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("userbeans.xml");
        User user = (User) context.getBean("user");
        System.out.println(user);
    }
}

c命名空间

<?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:c="http://www.springframework.org/schema/c"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--c命名空间,通过构造器注入-->
    <bean id="user2" class="top.huii.pojo.User" c:age="19" c:name="huii"/>
</beans>

bean的作用域

单例模式（默认）

只有一个对象

singleton
<bean id="accountService" class="com.foo.DefaultAccountService"/>

<!-- the following is equivalent, though redundant (singleton scope is the default) -->
<bean id="accountService" class="com.foo.DefaultAccountService" scope="singleton"/>

原型模式

每次从容器中get的时候，都会产生一个新对象

prototype
<bean id="accountService" class="com.foo.DefaultAccountService" scope="prototype"/>

其他

request，session，application只能在web开发中使用

Bean的自动装配

自动寻找并装配属性

配置的三种方式

  • xml中显式配置
  • java中显式配置
  • 隐式自动装配bean（*）

准备代码

cat.java

package top.huii.pojo;

public class Cat {
    public void shout(){
        System.out.println("miao");
    }
}

dog.java

package top.huii.pojo;

public class Dog {
    public void shout(){
        System.out.println("wang");
    }
}

people.java

package top.huii.pojo;

public class People {
    private Cat cat;
    private Dog dog;
    private String name;

    public Cat getCat() {
        return cat;
    }

    public void setCat(Cat cat) {
        this.cat = cat;
    }

    public Dog getDog() {
        return dog;
    }

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

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "People{" +
                "cat=" + cat +
                ", dog=" + dog +
                ", name='" + name + '\'' +
                '}';
    }
}

测试

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import top.huii.pojo.People;

public class MyTest {
    @Test
    public void test1(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        People people = context.getBean("people", People.class);
        people.getCat().shout();
        people.getDog().shout();
    }
}

byName自动装配

<?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 id="cat" class="top.huii.pojo.Cat"/>
    <bean id="dog" class="top.huii.pojo.Dog"/>
    <!--byName会自动在容器上下文中查找和自己对象set方法后面的值对应的beanid-->
    <bean id="people" class="top.huii.pojo.People" autowire="byName">
        <property name="name" value="HUII"/>
<!--        <property name="cat" ref="cat"/>-->
<!--        <property name="dog" ref="dog"/>-->
    </bean>
</beans>

需要保证所有的bean的id唯一，且这个bean需要和自动注入的属性的set方法的值一致。

byType自动装配

<?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 id="cat" class="top.huii.pojo.Cat"/>
    <bean id="dog" class="top.huii.pojo.Dog"/>
    <!--byType会自动在容器上下文中查找和自己对象相同类型的bean-->
    <bean id="people" class="top.huii.pojo.People" autowire="byType">
        <property name="name" value="HUII"/>
<!--        <property name="cat" ref="cat"/>-->
<!--        <property name="dog" ref="dog"/>-->
    </bean>
</beans>

byType甚至可以省略id

<?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="top.huii.pojo.Cat"/>
    <bean class="top.huii.pojo.Dog"/>
    <!--byName会自动在容器上下文中查找和自己对象set方法后面的值对应的beanid-->
    <!--byType会自动在容器上下文中查找和自己对象相同类型的bean-->
    <bean id="people" class="top.huii.pojo.People" autowire="byType">
        <property name="name" value="HUII"/>
<!--        <property name="cat" ref="cat"/>-->
<!--        <property name="dog" ref="dog"/>-->
    </bean>
</beans>

需要保证所有的bean的class唯一，且这个bean需要和自动注入的属性的类型一致。

使用注解实现自动装配

  • 导入约束 content约束
  • 配置注解的支持
<?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
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <context:annotation-config/>
    <bean class="top.huii.pojo.Cat"/>
    <bean class="top.huii.pojo.Dog"/>
    <bean id="people" class="top.huii.pojo.People"/>
</beans>

可以省去很多配置，甚至set可以省去

People.java

package top.huii.pojo;

import org.springframework.beans.factory.annotation.Autowired;

public class People {
    @Autowired
    private Cat cat;
    @Autowired
    private Dog dog;
    private String name;

    public Cat getCat() {
        return cat;
    }

    public Dog getDog() {
        return dog;
    }

    public String getName() {
        return name;
    }

    @Override
    public String toString() {
        return "People{" +
                "cat=" + cat +
                ", dog=" + dog +
                ", name='" + name + '\'' +
                '}';
    }
}

@Autowired直接在属性上使用即可。也可以在set方式上使用。可不写set。

@Nullable表明字段可为空

public class SimpleMovieLister {

    @Inject
    public void setMovieFinder(@Nullable MovieFinder movieFinder) {
        ...
    }
}

@Autowired较为复杂时，可以使用@Qualifier指定唯一bean对象注入

@Resource
public class SimpleMovieLister {

    private MovieFinder movieFinder;

    @Resource(name="myMovieFinder")
    public void setMovieFinder(MovieFinder movieFinder) {
        this.movieFinder = movieFinder;
    }
}

使用注解开发

使用注解需要导入context约束，增加注解的支持

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

    <context:annotation-config/>

</beans>

使用@Component

配置文件

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

    <context:component-scan base-package="top.huii.dao"/>
    <context:annotation-config/>

</beans>

User.java

package top.huii.dao;

import org.springframework.stereotype.Component;

//等价于在配置文件中进行配置
@Component
public class User {
    public String name = "HUII";
}

@Value属性注入

@Component
public class User {
    @Value("HUII")
    public String name = "HUII";
}

衍生注解

@Component有几个衍生注释

image-20210802141731740

UserDao.java

package top.huii.dao;

import org.springframework.stereotype.Repository;

@Repository
public class UserDao {
}

UserService

package top.huii.service;

import org.springframework.stereotype.Service;

@Service
public class UserService {
}

UserControl.java

package top.huii.controller;

import org.springframework.stereotype.Controller;

@Controller
public class UserControl {
}

配置文件

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

    <context:component-scan base-package="top.huii"/>
    <context:annotation-config/>

</beans>

几个功能都表示将某个类注册到Spring中

作用域@Scope

@Component
public class FactoryMethodComponent {

    @Bean @Scope("prototype")
    public TestBean prototypeInstance(InjectionPoint injectionPoint) {
        return new TestBean("prototypeInstance for " + injectionPoint.getMember());
    }
}

小结

  • xml更万能，适合任何场合，维护方便
  • 注解不是自己类使用不了，维护复杂

使用Java的方式配置spring

JavaConfig

image-20210802144851313

User.java

package top.huii.pojo;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class User {
    private String name;

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                '}';
    }
}

配置文件MyConfig.java

package top.huii.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import top.huii.pojo.User;

@Configuration
public class MyConfig {
    // 注册一个bean相当于bean标签
    // 方法名字相当于id，返回值相当于class
    @Bean
    public User getUser(){
        return new User();
    }
}

MyTest.java

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import top.huii.config.MyConfig;
import top.huii.pojo.User;

public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(MyConfig.class);
        User getUser = (User) context.getBean("getUser");
        System.out.println(getUser.getName());
    }
}

这种纯java配置的方法在SpringBoot中随处可见

代理模式

静态代理

Rent.java

package top.huii.demo1;

public interface Rent {
    public void rent();
}

Host.java

package top.huii.demo1;

public class Host  implements Rent{
    public void rent() {
        System.out.println("房东要出租房子");
    }
}

Proxy.java

package top.huii.demo1;

public class Proxy implements Rent{
    private Host host;
    public Proxy(){

    }
    public Proxy(Host host){
        this.host = host;
    }

    public void rent() {
        seeHouse();
        host.rent();
        heTong();
    }

    public void seeHouse(){
        System.out.println("看房");
    }

    public void heTong(){
        System.out.println("签合同");
    }
}

Client.java

package top.huii.demo1;

public class Client {
    public static void main(String[] args) {
        Host host = new Host();
        Proxy proxy = new Proxy(host);
        proxy.rent();
    }
}

优点

  • 使真实角色的操作更纯粹，不用去关心一些公共事务
  • 公共事务交给代理角色，实现了业务的分工
  • 公共业务发生拓展是方便集中管理

缺点

  • 一个真实角色就会产生一个代理角色，代码量翻倍，开发效率降低

动态代理

  • 动态代理与静态代理角色一样
  • 动态代理的代理类是动态生成的，不是我们直接写好的
  • 动态代理分为两大类：①基于接口——基于JDK ②基于类cglib

需要理解两个类：Proxy和InvocationHandler

ProxyInvocationHandler.java

package top.huii.demo2;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

// 自动生成代理类
public class ProxyInvocationHandler 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
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable{

        // 本质使用代理
        Object result = method.invoke(target, args);

        return result;
    }
}

优点：一个动态代理类可代理同一类业务

AOP

面向切面编程

依赖包

<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.9.7</version>
    <scope>runtime</scope>
</dependency>

使用原生Spring API实现

image-20210802183316830

UserService.java

package top.huii.service;

public interface UserService {
    public void add();
    public void delete();
    public void update();
    public void select();
}

UserServiceImpl.java

package top.huii.service;

public class UserServiceImpl implements UserService{
    public void add() {
        System.out.println("增加一个用户");
    }

    public void delete() {
        System.out.println("删除一个用户");
    }

    public void update() {
        System.out.println("修改一个用户");
    }

    public void select() {
        System.out.println("查询一个用户");
    }
}

Log.java

package top.huii.log;

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

public class Log implements MethodBeforeAdvice {
    // method:要执行的目标对象方法
    // args: 参数
    public void before(Method method, Object[] objects, Object o) throws Throwable {
        System.out.println(o.getClass().getName()+"的"+method.getName()+"被执行了");
    }
}

AfterLog.java

package top.huii.log;

import org.springframework.aop.AfterReturningAdvice;

import java.lang.reflect.Method;

public class AfterLog implements AfterReturningAdvice {
    public void afterReturning(Object o, Method method, Object[] objects, Object o1) throws Throwable {
        System.out.println("执行了"+method.getName()+"返回结果为"+o);
    }
}

配置文件

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

    <bean id="userService" class="top.huii.service.UserServiceImpl"/>
    <bean id="log" class="top.huii.log.Log"/>
    <bean id="afterLog" class="top.huii.log.AfterLog"/>

<!--    配置aop-->
    <aop:config>
        <!--切入点-->
        <aop:pointcut id="pointcut" expression="execution(* top.huii.service.UserServiceImpl.*(..))"/>
        <aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
        <aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>


    </aop:config>
</beans>

测试文件

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import top.huii.service.UserService;

public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = context.getBean("userService", UserService.class);
        userService.add();
    }
}

自定义类

DiyPointCut.java

package top.huii.diy;

public class DiyPointCut {
    public void before() {
        System.out.println("=====方法执行前=====");
    }

    public void after() {
        System.out.println("=====方法执行后=====");
    }
}

配置文件

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

    <bean id="userService" class="top.huii.service.UserServiceImpl"/>
    <bean id="log" class="top.huii.log.Log"/>
    <bean id="afterLog" class="top.huii.log.AfterLog"/>
    <!--方式二：自定义类-->
    <bean id="diy" class="top.huii.diy.DiyPointCut"/>
    <aop:config>
        <aop:aspect ref="diy">
            <!--切入点-->
            <aop:pointcut id="point" expression="execution(* top.huii.service.UserServiceImpl.*(..))"/>
            <aop:before method="before" pointcut-ref="point"/>
            <aop:after method="after" pointcut-ref="point"/>
        </aop:aspect>
    </aop:config>
</beans>

注解实现

AnnotationPointCut.java

package top.huii.diy;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class AnnotationPointCut {
    @Before("execution(* top.huii.service.UserServiceImpl.*(..))")
    public void before(){
        System.out.println("=====方法执行前=====");
    }
}

配置文件

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

    <bean id="userService" class="top.huii.service.UserServiceImpl"/>
    <bean id="log" class="top.huii.log.Log"/>
    <bean id="afterLog" class="top.huii.log.AfterLog"/>
    <!--方式三：注解-->
    <bean id="annotationPointCut" class="top.huii.diy.AnnotationPointCut"/>
    <aop:aspectj-autoproxy/>
</beans>

整合Mybatis

基本环境搭建

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>learn_spring1</artifactId>
        <groupId>top.huii</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>Mybatis-spr</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.9</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.9</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.7</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>
    </dependencies>

</project>

Mybatis

参考之前的

MyBatis-Spring

方式一

出问题了。。。

声明式事务

确保完整性和一致性

事务的ACID原则

  • 原子性
  • 一致性
  • 隔离性
  • 持久性

。。。

【完】

本文作者： HUII
本文链接： https://www.huii.top/1863.html
版权声明：本博客所有文章除特别声明外，均采用 CC BY-NC-SA 4.0 许可协议。转载请注明来自飞一网 ！部分图片来源见水印或引用。
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