Spring 学习

public interface UserDao {
    void getUser();
}

public class UserDaoImpl implements UserDao {
    public void getUser() {
        System.out.println("默认获取用户数据");
    }
}

public interface UserService {
    void getUser();
}

public class UserServiceImpl implements UserService {

    private UserDao userDao = new UserDaoImpl();

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

public class MyTest {
    public static void main(String[] args) {

        //用户实际调用的是业务层，dao层他们不需要接触！
        UserService userService = new UserServiceImpl();
        userService.getUser();
    }
}

public class UserDaoMySqlImpl implements UserDao {
    @Override
    public void getUser() {
        System.out.println("MySql获取用户数据");
    }
}

public class UserServiceImpl implements UserService {
    private UserDao userDao = new UserDaoMySqlImpl();
    @Override
    public void getUser() {
        userDao.getUser();
    }
}

public class UserServiceImpl implements UserService {
    private UserDao userDao;
    // 利用set实现
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }
    @Override
    public void getUser() {
        userDao.getUser();
    }
}

@Test
public void test(){
    UserServiceImpl service = new UserServiceImpl();
    service.setUserDao( new UserDaoMySqlImpl() );
    service.getUser();
    //那我们现在又想用Oracle去实现呢
    service.setUserDao( new UserDaoOracleImpl() );
    service.getUser();
}

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 + '\'' +
                '}';
    }
}

<?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">


    <!--使用Spring来创建对象，在Spring这些都称为Bean
    类型 变量名 = new 类型();
    Hello hello = new Hello();

    id = 变量名
    class = new的对象
    property 相当于给对象中的属性设置一个值！
        -->
    <bean id="hello" class="com.she11F.Hello">
        <property name="str" value="Spring"/>
    </bean>
</beans>

public class MyTest {
    public static void main(String[] args) {
        //获取Spring的上下文对象！
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");

        //我们的对象现在都在Spring中的管理了，我们需要使用，直接去里面取出来就可以！
        Hello hello = (Hello) context.getBean("hello");
        System.out.println(hello.toString());
    }
}

<bean id="MysqlImpl" class="com.she11F.dao.UserDaoMySqlImpl">

</bean>
<bean id="ServiceImpl" class="com.she11F.service.UserServiceImpl">
    <!--注意: 这里的name并不是属性 , 而是set方法后面的那部分 , 首字母小写-->
    <!--引用另外一个bean , 不是用value 而是用 ref-->
    <property name="userDao" ref="MysqlImpl"></property>
</bean>

public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserServiceImpl serviceImpl = (UserServiceImpl) context.getBean("ServiceImpl");
        serviceImpl.getUser();
    }
}

public class User {
    private String name;
    public User() {
        System.out.println("user无参构造方法");
    }
    public void setName(String name) {
        this.name = name;
    }
    public void show(){
        System.out.println("name="+ name );
    }
}

@Test
public void test(){
    ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
    //在执行getBean的时候, user已经创建好了 , 通过无参构造
    User user = (User) context.getBean("user");
    //调用对象的方法 .
    user.show();
}

public class UserT {
    private String name;
    public UserT(String name) {
        this.name = name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void show(){
        System.out.println("name="+ name );
    }
}

<!-- 第一种根据index参数下标设置 -->
<bean id="userT" class="com.kuang.pojo.UserT">
    <!-- index指构造方法 , 下标从0开始 -->
    <constructor-arg index="0" value="she11F"/>
</bean>

<!-- 第二种根据参数名字设置，最推荐 -->
<bean id="userT" class="com.kuang.pojo.UserT">
    <!-- name指参数名 -->
    <constructor-arg name="name" value="she11F"/>
</bean>

<!-- 第三种根据参数类型设置,不推荐 -->
<bean id="userT" class="com.kuang.pojo.UserT">
    <constructor-arg type="java.lang.String" value="she11F"/>
</bean>

<import resource="{path}/beans.xml"/>

package com.she11F.pojo;

public class Address {
    private String address;
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
}

package com.she11F.pojo;

import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class Student {
    private String name;
    private Address address;
    private String[] books;
    private List<String> hobbys;
    private Map<String,String> card;
    private Set<String> games;
    private String wife;
    private Properties info;
    public void setName(String name) {
        this.name = name;
    }
    public void setAddress(Address address) {
        this.address = address;
    }
    public void setBooks(String[] books) {
        this.books = books;
    }
    public void setHobbys(List<String> hobbys) {
        this.hobbys = hobbys;
    }
    public void setCard(Map<String, String> card) {
        this.card = card;
    }
    public void setGames(Set<String> games) {
        this.games = games;
    }
    public void setWife(String wife) {
        this.wife = wife;
    }
    public void setInfo(Properties info) {
        this.info = info;
    }
    public String getName() {
        return name;
    }
    public void show(){
        System.out.println("name="+ name
                + ",address="+ address.getAddress()
                + ",books="
        );
        for (String book:books){
            System.out.print("<<"+book+">>\t");
        }
        System.out.println("\n爱好:"+hobbys);
        System.out.println("card:"+card);
        System.out.println("games:"+games);
        System.out.println("wife:"+wife);
        System.out.println("info:"+info);
    }
}

public class User {
    private String name;
    private int age;
    public void setName(String name) {
        this.name = name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

导入约束 : xmlns:p="http://www.springframework.org/schema/p"
<!--P(属性: properties)命名空间 , 属性依然要设置set方法-->
<bean id="user" class="com.she11F.pojo.User" p:name="she11f" />

User user1 = (User) context.getBean("user");
User user2 = (User) context.getBean("user");
System.out.println(user1 == user2);

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

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

public class User {
    private Cat cat;
    private Dog dog;
    private String str;
}

<?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">

    <!--开启注解的支持    -->
    <context:annotation-config/>
</beans>

public class User {
    @Autowired
    private Cat cat;
    @Autowired
    private Dog dog;
    private String str;
    public Cat getCat() {
        return cat;
    }
    public Dog getDog() {
        return dog;
    }
    public String getStr() {
        return str;
    }
}

//如果允许对象为null，设置required = false,默认为true
@Autowired(required = false)
private Cat cat;

@Autowired
@Qualifier(value = "cat2")
private Cat cat;
@Autowired
@Qualifier(value = "dog2")
private Dog dog;

public class User {
    //如果允许对象为null，设置required = false,默认为true
    @Resource(name = "cat2")
    private Cat cat;
    @Resource
    private Dog dog;
    private String str;
}

@Resource
private Cat cat;
@Resource
private Dog dog;

<?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">
</beans>

@Component("user")
// 相当于配置文件中 <bean id="user" class="当前注解的类"/>
public class User {
    public String name = "she11F";
}

@Component("user")
// 相当于配置文件中 <bean id="user" class="当前注解的类"/>
public class User {
    @Value("she11F")
    // 相当于配置文件中 <property name="name" value="she11F"/>
    public String name;
}

@Controller("user")
@Scope("prototype")
public class User {
    @Value("she11F")
    public String name;
}

@Component  //将这个类标注为Spring的一个组件，放到容器中！
public class User {
    @Value("she11F")
    public String name;
}

@Configuration  //代表这是一个配置类
public class MyConfig {
    @Bean //通过方法注册一个bean，这里的返回值就Bean的类型，方法名就是bean的id！
    public User user(){
        return new User();
    }
}

ApplicationContext context = new AnnotationConfigApplicationContext(MyConfig.class);
       User user = (User) context.getBean("user");
       System.out.println(user.name);

<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.9.4</version>
</dependency>

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

public class UserServiceImpl implements UserService{
    @Override
    public void add() {
        System.out.println("增加用户");
    }
    @Override
    public void delete() {
        System.out.println("删除用户");
    }
    @Override
    public void update() {
        System.out.println("更新用户");
    }
    @Override
    public void search() {
        System.out.println("查询用户");
    }
}

public class Log implements MethodBeforeAdvice {
    //method : 要执行的目标对象的方法
    //objects : 被调用的方法的参数
    //Object : 目标对象
    @Override
    public void before(Method method, Object[] objects, Object o) throws Throwable {
        System.out.println( o.getClass().getName() + "的" + method.getName() + "方法被执行了");
    }
}

public class AfterLog implements AfterReturningAdvice {
    //returnValue 返回值
    //method被调用的方法
    //args 被调用的方法的对象的参数
    //target 被调用的目标对象
    @Override
    public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
        System.out.println("执行了" + target.getClass().getName()
        +"的"+method.getName()+"方法,"
        +"返回值："+returnValue);
    }
}

<?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">
    <!--注册bean-->
    <bean id="userService" class="com.she11F.service.UserServiceImpl"/>
    <bean id="log" class="com.she11F.log.Log"/>
    <bean id="afterLog" class="com.she11F.log.AfterLog"/>
    <!--aop的配置-->
    <aop:config>
        <!--切入点  expression:表达式匹配要执行的方法-->
        <aop:pointcut id="pointcut" expression="execution(* com.she11F.service.UserServiceImpl.*(..))"/>
        <!--执行环绕; advice-ref执行方法 . pointcut-ref切入点-->
        <aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
        <aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>
    </aop:config>
</beans>

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---------");
    }
}

<!--第二种方式自定义实现-->
<!--注册bean-->
<bean id="diy" class="com.she11F.diy.DiyPointcut"/>
<bean id="userService" class="com.she11F.service.UserServiceImpl"/>
<!--aop的配置-->
<aop:config>
    <!--第二种方式：使用AOP的标签实现-->
    <aop:aspect ref="diy">
        <aop:pointcut id="diyPonitcut" expression="execution(* com.she11F.service.UserServiceImpl.*(..))"/>
        <aop:before pointcut-ref="diyPonitcut" method="before"/>
        <aop:after pointcut-ref="diyPonitcut" method="after"/>
    </aop:aspect>
</aop:config>

package com.she11F.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;

@Aspect
public class AnnotationPointcut {
    @Before("execution(* com.she11F.service.UserServiceImpl.*(..))")
    public void before(){
        System.out.println("---------方法执行前---------");
    }
    @After("execution(* com.she11F.service.UserServiceImpl.*(..))")
    public void after(){
        System.out.println("---------方法执行后---------");
    }
    @Around("execution(* com.she11F.service.UserServiceImpl.*(..))")
    public void around(ProceedingJoinPoint jp) throws Throwable {
        System.out.println("环绕前");
        System.out.println("签名:"+jp.getSignature());
        //执行目标方法proceed
        Object proceed = jp.proceed();
        System.out.println("环绕后");
        System.out.println(proceed);
    }
}

<!--第三种方式:注解实现-->
<bean id="annotationPointcut" class="com.kuang.config.AnnotationPointcut"/>
<aop:aspectj-autoproxy/>

<?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.kuang.mapper.UserMapper">

    <!--sql-->
    <select id="selectUser" resultType="user">
        select * from mybatis.user
    </select>
</mapper>

@Test
public void selectUser() throws IOException {
    String resource = "mybatis-config.xml";
    InputStream inputStream = Resources.getResourceAsStream(resource);
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    SqlSession sqlSession = sqlSessionFactory.openSession();
    UserMapper mapper = sqlSession.getMapper(UserMapper.class);
    List<User> userList = mapper.selectUser();
    for (User user: userList){
        System.out.println(user);
    }
    sqlSession.close();
}