package com.atguigu.spring6.bean;

public class HelloWorld {
    
    public void sayHello(){
        System.out.println("helloworld");
    }
}

public class HelloWorldTest {

    @Test
    public void testHelloWorld(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        HelloWorld helloworld = (HelloWorld) ac.getBean("helloWorld");
        helloworld.sayHello();
    }
}

public class HelloWorldTest {

    private Logger logger = LoggerFactory.getLogger(HelloWorldTest.class);

    @Test
    public void testHelloWorld(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        HelloWorld helloworld = (HelloWorld) ac.getBean("helloWorld");
        helloworld.sayHello();
        logger.info("执行成功");
    }
}

@Test 
public void test01(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");

    // 通过id获取
    User user1 = (User) applicationContext.getBean("user");


    System.out.println("ID : " + user1);

}

@Test 
public void test01(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");

    // 通过类获取
    User user2 = applicationContext.getBean(User.class);

    System.out.println("Class : " + user2);
}

@Test 
   public void test01(){
       ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");

       // 通过类和ID获取
       User user3 = applicationContext.getBean("user", User.class);

       System.out.println("ID && Class : " + user3);
   }

public void test02(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
    UserBean bean = applicationContext.getBean(UserBean.class);
    // 成功 输出UserImpl
    System.out.println(bean);
}

public void test02(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
    UserBean bean = applicationContext.getBean(UserBean.class);
    // 失败
    // No qualifying bean of type 'com.hgu.bean.UserBean' available: expected single matching bean but found 2: userImpl,personImpl
    System.out.println(bean);
}

package com.hgu;

public class User {
    private String like;
    private String grade;

    public User() {
    }

    public String getLike() {
        return like;
    }

    public void setLike(String like) {
        this.like = like;
    }

    public String getGrade() {
        return grade;
    }

    public void setGrade(String grade) {
        this.grade = grade;
    }
}

@Test 
public void test01(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");

    // 通过id获取
    User user1 = (User) applicationContext.getBean("user");
	
    System.out.println(user1);
    // User{like='B', grade='A'}
}

package com.hgu;

public class User {
    private String like;
    private String grade;

    public User() {
    }

    public User(String like, String grade) {
        System.out.println("有参构造器");
        this.like = like;
        this.grade = grade;
    }

    public String getLike() {
        return like;
    }

    public void setLike(String like) {
        this.like = like;
    }

    public String getGrade() {
        return grade;
    }

    public void setGrade(String grade) {
        this.grade = grade;
    }

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

<?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="user" class="com.hgu.User" >
        <constructor-arg name="grade" value="A" />
        <constructor-arg name="like" value="B" />
    </bean>
   
</beans>

@Test 
public void test01(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");

    // 通过id获取
    User user1 = (User) applicationContext.getBean("user");

    System.out.println(user1);
    // 有参构造器
	// User{like='B', grade='A'}
}

package com.hgu;

public class Person {
    private String sex;
    private String name;

    public Person() {
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getName() {
        return name;
    }

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

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

package com.hgu;

public class User {
    private String like;
    private String grade;
    
    private Person person;

    public User() {
    }

    public User(String like, String grade) {
        System.out.println("有参构造器");
        this.like = like;
        this.grade = grade;
    }

    public String getLike() {
        return like;
    }

    public void setLike(String like) {
        this.like = like;
    }

    public String getGrade() {
        return grade;
    }

    public void setGrade(String grade) {
        this.grade = grade;
    }

    public Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }

    @Override
    public String toString() {
        return "User{" +
                "like='" + like + '\'' +
                ", grade='" + grade + '\'' +
                ", person=" + person +
                '}';
    }
}

public void test01(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");

    // 通过id获取
    User user1 = (User) applicationContext.getBean("user");

    System.out.println(user1);
    // User{like='B', grade='A', person=Person{sex='男', name='张三'}}
}

package com.hgu;

import java.util.Arrays;

public class Person {
    private String[] loves;
    public Person() {
    }
    
    public String[] getLoves() {
        return loves;
    }

    public void setLoves(String[] loves) {
        this.loves = loves;
    }

    @Override
    public String toString() {
        return "Person{" +
                "loves=" + Arrays.toString(loves) +
                '}';
    }
}

package com.hgu;

import java.util.Arrays;
import java.util.List;

public class Person {
    private List<User> loves;
    public Person() {
    }

    public List<User> getLoves() {
        return loves;
    }

    public void setLoves(List<User> loves) {
        this.loves = loves;
    }

    @Override
    public String toString() {
        return "Person{" +
                "loves=" + loves +
                '}';
    }
}

package com.hgu;

import java.util.Map;

public class Person {
    private Map<String,User> test;
    public Person() {
    }

    public Map<String, User> getTest() {
        return test;
    }

    public void setTest(Map<String, User> test) {
        this.test = test;
    }
}

@Test
public void test03(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
    Person person = (Person) applicationContext.getBean("person");
    System.out.println(person);
    // Person{test={123=User{like='aa', grade='null', person=null}, 1234=User{like='bb', grade='null', person=null}}}
}

package com.hgu;

import java.util.List;
import java.util.Map;

public class Person {
    private Map<String,User> test;
    private List<User> myList;
    public Person() {
    }

    public Map<String, User> getTest() {
        return test;
    }

    public void setTest(Map<String, User> test) {
        this.test = test;
    }

    public List<User> getMyList() {
        return myList;
    }

    public void setMyList(List<User> myList) {
        this.myList = myList;
    }

    @Override
    public String toString() {
        return "Person{" +
                "test=" + test +
                ", myList=" + myList +
                '}';
    }
}

@Test
public void test03(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
    Person person = (Person) applicationContext.getBean("person");
    System.out.println(person);
    // Person{test={100=User{like='bb', grade='null', person=null}}, myList=[User{like='aa', grade='null', person=null}, User{like='bb', grade='null', person=null}]}
}

@Test
public void test03(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
    Person person = (Person) applicationContext.getBean("person");
    System.out.println(person);
    // Person{test={100=User{like='bb', grade='null', person=null}}, myList=[User{like='aa', grade='null', person=null}, User{like='bb', grade='null', person=null}]}
}

@Test
public void test04(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean-jdbc.xml");
    User user = (User) applicationContext.getBean("user");
    System.out.println(user);
    // User{url='jdbc:mysql://localhost:3306/test?CharacterEncoding=utf8&useUnicode=true', password='admin', user='root', driverClass='com.mysql.cj.jdbc.Driver'}

}

package com.hgu;

public class User {
    private String url;
    private String password;
    private String user;
    private String driverClass;

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getDriverClass() {
        return driverClass;
    }

    public void setDriverClass(String driverClass) {
        this.driverClass = driverClass;
    }

    @Override
    public String toString() {
        return "User{" +
                "url='" + url + '\'' +
                ", password='" + password + '\'' +
                ", user='" + user + '\'' +
                ", driverClass='" + driverClass + '\'' +
                '}';
    }
}

@Test
public void test05(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean-scope.xml");
    Object user = applicationContext.getBean("user");
    System.out.println(user);
    Object user1 = applicationContext.getBean("user");
    System.out.println(user1);
    // com.hgu.User@7776ab
	// com.hgu.User@79179359
}

@Test
public void test05(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean-scope.xml");
    Object user = applicationContext.getBean("user");
    System.out.println(user);
    Object user1 = applicationContext.getBean("user");
    System.out.println(user1);
	// com.hgu.User@7ac0e420
	// com.hgu.User@7ac0e420
}

package com.hgu.life;

public class LifeBean {
    private String name;
    public LifeBean() {
        System.out.println("1. bean对象创建调用无参构造器");
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        System.out.println("2. 给bean对象赋值调用set方法");
        this.name = name;
    }
    
    public void initMethod(){
        System.out.println("4. bean对象初始化");
    }
    public void destroyMethod(){
        System.out.println("7. bean对象销毁");
    }
}

package com.hgu.life;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class MyPost implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("3.bean后置处理器，初始化之前执行，调用postProcessBeforeInitialization方法");
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("5.bean后置处理器，初始化之后执行，调用postProcessAfterInitialization方法");
        return bean;
    }
}

@Test
public void test06(){
    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans-life.xml");
    applicationContext.getBean("life");
    System.out.println("6. bean对象已经就绪");
    applicationContext.close();
}
// 	1. bean对象创建调用无参构造器
//	2. 给bean对象赋值调用set方法
//	3.bean后置处理器，初始化之前执行，调用postProcessBeforeInitialization方法
//	4. bean对象初始化
//	5.bean后置处理器，初始化之后执行，调用postProcessAfterInitialization方法
//	6. bean对象已经就绪
//	7. bean对象销毁

/*
 * Copyright 2002-2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.beans.factory;

import org.springframework.lang.Nullable;

/**
 * Interface to be implemented by objects used within a {@link BeanFactory} which
 * are themselves factories for individual objects. If a bean implements this
 * interface, it is used as a factory for an object to expose, not directly as a
 * bean instance that will be exposed itself.
 *
 * <p><b>NB: A bean that implements this interface cannot be used as a normal bean.</b>
 * A FactoryBean is defined in a bean style, but the object exposed for bean
 * references ({@link #getObject()}) is always the object that it creates.
 *
 * <p>FactoryBeans can support singletons and prototypes, and can either create
 * objects lazily on demand or eagerly on startup. The {@link SmartFactoryBean}
 * interface allows for exposing more fine-grained behavioral metadata.
 *
 * <p>This interface is heavily used within the framework itself, for example for
 * the AOP {@link org.springframework.aop.framework.ProxyFactoryBean} or the
 * {@link org.springframework.jndi.JndiObjectFactoryBean}. It can be used for
 * custom components as well; however, this is only common for infrastructure code.
 *
 * <p><b>{@code FactoryBean} is a programmatic contract. Implementations are not
 * supposed to rely on annotation-driven injection or other reflective facilities.</b>
 * {@link #getObjectType()} {@link #getObject()} invocations may arrive early in the
 * bootstrap process, even ahead of any post-processor setup. If you need access to
 * other beans, implement {@link BeanFactoryAware} and obtain them programmatically.
 *
 * <p><b>The container is only responsible for managing the lifecycle of the FactoryBean
 * instance, not the lifecycle of the objects created by the FactoryBean.</b> Therefore,
 * a destroy method on an exposed bean object (such as {@link java.io.Closeable#close()}
 * will <i>not</i> be called automatically. Instead, a FactoryBean should implement
 * {@link DisposableBean} and delegate any such close call to the underlying object.
 *
 * <p>Finally, FactoryBean objects participate in the containing BeanFactory's
 * synchronization of bean creation. There is usually no need for internal
 * synchronization other than for purposes of lazy initialization within the
 * FactoryBean itself (or the like).
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 08.03.2003
 * @param <T> the bean type
 * @see org.springframework.beans.factory.BeanFactory
 * @see org.springframework.aop.framework.ProxyFactoryBean
 * @see org.springframework.jndi.JndiObjectFactoryBean
 */
public interface FactoryBean<T> {

    /**
     * The name of an attribute that can be
     * {@link org.springframework.core.AttributeAccessor#setAttribute set} on a
     * {@link org.springframework.beans.factory.config.BeanDefinition} so that
     * factory beans can signal their object type when it can't be deduced from
     * the factory bean class.
     * @since 5.2
     */
    String OBJECT_TYPE_ATTRIBUTE = "factoryBeanObjectType";

    /**
     * Return an instance (possibly shared or independent) of the object
     * managed by this factory.
     * <p>As with a {@link BeanFactory}, this allows support for both the
     * Singleton and Prototype design pattern.
     * <p>If this FactoryBean is not fully initialized yet at the time of
     * the call (for example because it is involved in a circular reference),
     * throw a corresponding {@link FactoryBeanNotInitializedException}.
     * <p>As of Spring 2.0, FactoryBeans are allowed to return {@code null}
     * objects. The factory will consider this as normal value to be used; it
     * will not throw a FactoryBeanNotInitializedException in this case anymore.
     * FactoryBean implementations are encouraged to throw
     * FactoryBeanNotInitializedException themselves now, as appropriate.
     * @return an instance of the bean (can be {@code null})
     * @throws Exception in case of creation errors
     * @see FactoryBeanNotInitializedException
     */
    @Nullable
    T getObject() throws Exception;

    /**
     * Return the type of object that this FactoryBean creates,
     * or {@code null} if not known in advance.
     * <p>This allows one to check for specific types of beans without
     * instantiating objects, for example on autowiring.
     * <p>In the case of implementations that are creating a singleton object,
     * this method should try to avoid singleton creation as far as possible;
     * it should rather estimate the type in advance.
     * For prototypes, returning a meaningful type here is advisable too.
     * <p>This method can be called <i>before</i> this FactoryBean has
     * been fully initialized. It must not rely on state created during
     * initialization; of course, it can still use such state if available.
     * <p><b>NOTE:</b> Autowiring will simply ignore FactoryBeans that return
     * {@code null} here. Therefore it is highly recommended to implement
     * this method properly, using the current state of the FactoryBean.
     * @return the type of object that this FactoryBean creates,
     * or {@code null} if not known at the time of the call
     * @see ListableBeanFactory#getBeansOfType
     */
    @Nullable
    Class<?> getObjectType();

    /**
     * Is the object managed by this factory a singleton? That is,
     * will {@link #getObject()} always return the same object
     * (a reference that can be cached)?
     * <p><b>NOTE:</b> If a FactoryBean indicates to hold a singleton object,
     * the object returned from {@code getObject()} might get cached
     * by the owning BeanFactory. Hence, do not return {@code true}
     * unless the FactoryBean always exposes the same reference.
     * <p>The singleton status of the FactoryBean itself will generally
     * be provided by the owning BeanFactory; usually, it has to be
     * defined as singleton there.
     * <p><b>NOTE:</b> This method returning {@code false} does not
     * necessarily indicate that returned objects are independent instances.
     * An implementation of the extended {@link SmartFactoryBean} interface
     * may explicitly indicate independent instances through its
     * {@link SmartFactoryBean#isPrototype()} method. Plain {@link FactoryBean}
     * implementations which do not implement this extended interface are
     * simply assumed to always return independent instances if the
     * {@code isSingleton()} implementation returns {@code false}.
     * <p>The default implementation returns {@code true}, since a
     * {@code FactoryBean} typically manages a singleton instance.
     * @return whether the exposed object is a singleton
     * @see #getObject()
     * @see SmartFactoryBean#isPrototype()
     */
    default boolean isSingleton() {
        return true;
    }
}

package com.atguigu.spring6.bean;
public class UserFactoryBean implements FactoryBean<User> {
    @Override
    public User getObject() throws Exception {
        return new User();
    }

    @Override
    public Class<?> getObjectType() {
        return User.class;
    }
}

@Test
public void testUserFactoryBean(){
    //获取IOC容器
    ApplicationContext ac = new ClassPathXmlApplicationContext("spring-factorybean.xml");
    User user = (User) ac.getBean("user");
    System.out.println(user);
}

package com.hgu.web.controller;

import com.hgu.web.service.UserService;

public class UserController {
    private UserService userService;

    public UserService getUserService() {
        return userService;
    }

    public void setUserService(UserService userService) {
        this.userService = userService;
    }

    public void UserControllerFunction(){
        System.out.println("UserControllerFunction中的方法调用了");
        userService.userServiceFunction();
    }
}

package com.hgu.web.service;

import com.hgu.web.dao.UserDAO;

public class UserServiceImpl implements UserService{
    private UserDAO userDAO;

    public UserDAO getUserDAO() {
        return userDAO;
    }

    public void setUserDAO(UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    @Override
    public void userServiceFunction() {
        System.out.println("UserServiceFunction中的方法调用了");
        userDAO.userDAOFunction();
    }
}

package com.hgu.web.service;

public interface UserService {
    void userServiceFunction();
}

package com.hgu.web.dao;

public class UserDAOImpl implements UserDAO{
    @Override
    public void userDAOFunction() {
        System.out.println("UserDAO中的方法调用了");
    }
}

package com.hgu.web.dao;

public interface UserDAO {
    void userDAOFunction();
}

@Test
public void testAutoWireByXML(){
    ApplicationContext ac = new ClassPathXmlApplicationContext("autowire-xml.xml");
    UserController userController = ac.getBean(UserController.class);
    userController.saveUser();
}